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Talks​​

  1. "Tunable diode laser spectroscopy as a potent technology to meet the challenges of air quality monitoring in India", Conference on Lasers and Electro0optics (CLEO 2024), Track Environmental Sensing Applications of Optical Measurements and Instrumentation, 11-13 Dec 2023, Charlotte, North Carolina, USA (invited)

  2. "Emerging trends in wavelength-modulated tunable diode laser spectroscopy”, 46th Optical Society of India Symposium, (OPTIQ 2023), 11-13 Dec 2023, Cochin University of Science and Technology (CUSAT), Kochi (invited)

  3. "Laser spectroscopy-based air quality monitoring for smart cities”, Workshop on Innovative Optical Sensors 2023 (WIOS 2023), 24-25 July 2023, University of Malaya, Kuala Lumpur, Malaysia (invited)

  4. "Applications of high-sensitivity gas sensing using tunable semiconductor lasers", Indo-French workshop on Microwave and Photonic Technologies (IWMP), IIT Madras, 20-23 Feb 2023 (invited)

  5. "Tunable diode laser-based spectroscopy for robust in-field measurements of trace gases", Conference on Optics, Photonics & Quantum Optics, (COPaQ 2022), XLV Symposium of Optical Society of India (OSI), 10-13 Nov, 2022 (invited)

  6. "Adventures in applied research using mid-IR tunable laser spectroscopy", Student Conference on Optics and Photonics (SCOP 2022), 28-30 Sep 2022, Physical Research Laboratory, Ahmedabad, (invited)

  7. "Tunable diode laser-based photonic sensors in inter-disciplinary applied research”, 2nd International Conference on Innovative Optical Sensors 2022 (ICoIOS22) 18-19 July 2022, University of Malaya, Kuala Lumpur, Malaysia (invited)

  8. “A fiber Bragg Grating-based instrumented glove to measure finger flexure for use in post-stroke rehabilitation”, 4th IEEE International Conference focusing on Telecommunications and Photonics (IEEE ICTP) 22-24 December 2021, BUET, Dhaka, Bangladesh (invited)

  9. "High resolution near-IR and mid-IR tunable diode laser spectroscopy - techniques and applications", SPIE-OSA-OSI Student Chapter, Department of Applied Optics and Photonics, University of Calcutta, 18 Sep 2021 (invited)

  10. “Quantum cascade laser-based mid-infrared calibration-free wavelength modulation spectroscopy”, Asia Communications and Photonics Conference - International Conference on Information Photonics and Optical Communications (ACP-IPOC 2020), 24-27 Oct 2020, Beijing (invited), Link

  11. "Photonic sensors for demanding applications in science and technology", 2nd International Conference on Ubiquitous and Emerging concepts on Sensors and Transducers (UEMCOS 2020), 16-18 Oct 2020, Kolkata, India (invited) 

  12. "Tunable diode laser spectroscopy - a versatile technique for gas and chemical sensing", 28th DAE-BRNS National Laser Symposium (NLS-28), 8-11 Jan 2020, Vellore, India (invited)

  13. "Fiber Optic Sensors and Related Technologies", Short Course at the 28th DAE-BRNS National Laser Symposium (NLS-28), 8-11 Jan 2020, Vellore, India

  14. Chemical sensing using tunable semiconductor lasers - applications relevant to India", Photonics and Sensors Workshop, City University London, 27-28 June 2019, (invited)

  15. "Deployment of near-IR and mid-IR tunable laser diode spectroscopy systems for urban pollution monitoring - the first set of results from Ahmedabad and Mt Abu", Student Conference on Optics and Photonics (SCOP 2018), Oct 4-6, 2018, Physical Research Laboratory, Ahmedabad, India (invited)

  16. "Calibration-free near-infrared and mid-infrared wavelength modulation spectroscopy in industrial sensing and microbiological growth studies", The 10th International Conference on Information Optics and Photonics (CIOP 2018), (Session 2: Advanced Fiber Optics & Sensing Technology), Beijing, China, July 8-11, 2018. (invited). Link

  17. "Gas sensing using near-IR and mid-IR tunable semiconductor lasers for industrial and bio-sensing applications", Department of Electrical and Electronic Engineering, City University London, 1 June 2018. Link

  18. "Environmental monitoring and bio-sensing applications of tunable diode laser spectroscopy" - 3rd IEEE Workshop on Recent Progress in Photonics (IEEE WRAP 2017), Mahindra Ecole Centrale, 18-19 Dec 2017 (invited)

  19. "Potential of tunable diode laser spectroscopy for detecting oxygen leaks in helicopters", Defense Bioengineering and Electromedical Laboratory (DEBEL), DRDO, Bangalore, 1 July 2016 (invited)

  20. "Industrial applications of fiber-optic sensors”, Annual Photonics Workshop (APW 2011), Cochin University of Science and Technology, Cochin, 28 Feb 2011 (invited)

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Book chapter

  1. Chakraborty A.L., Roy A. (2021) Wavelength Modulation Spectroscopy. In: Singh D.K., Pradhan M., Materny A. (eds) Modern Techniques of Spectroscopy. Progress in Optical Science and Photonics, vol 13. Springer, Singapore. Link  (invited)
     

Patents

  1. C K Jha and A L Chakraborty, “A system for monitoring hand and finger movements”, Indian Patent Office, Complete Patent Application No 202021029035, date of filing 8 July, 2021

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Journal papers

  1. S De, D Paul, K T V Grattan and A L Chakraborty, "On-road, real-time monitoring of ambient water vapour in Ahmedabad-Gandhinagar using a fully automated 1392 nm tunable diode laser-based system", manuscript in preparation

  2. S De, Ramya S, K T V Grattan and A L Chakraborty, “Detailed analysis of the 𝑅1𝑓/Δ𝐼1 WMS technique and demonstration of significantly higher detection sensitivity compared to 2𝑓 WMS for calibration-free trace gas sensing”, Applied Optics, 62, 3160-3168 (2023) Link

  3. C K Jha, K Jajoria, A L Chakraborty and H Shekhar, "A fiber Bragg grating-based sensor for passive cavitation detection at MHz frequencies," IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 69 (5), pp. 1682-1690, May 2022, Link

  4. P Ghosh, Varsha T, A Kar, A L Chakraborty and S Khatua, “Light-induced in situ active tuning of the LSPR of gold nanorods over 90 nm”, Optics Letters, 46, 4562-4565 (2021), Aug 2021 Link

  5. A Roy and A L Chakraborty, "QCL-based open-path, single-pass measurement of ambient carbon monoxide using R1f/ΔI1 WMS", IEEE Photonics Technology Letters, 33(18), 982-985 (15 Sep 2021) Link 

  6. C K Jha, K Gajapure and A L Chakraborty, “Design and evaluation of an FBG sensor-based glove to simultaneously monitor flexure of ten finger joints”, IEEE Sensors Journal, 21(6), 7620-7630 (March 2021) Link

  7. Zarin A S, A L Chakraborty, S Khatua, "Time-resolved studies of bioluminescence from Photobacterium leiognathi and antimicrobial susceptibility testing on E. coli using tunable diode laser spectroscopy", IEEE Sensors Journal, 40(19), pp 11073-11081 Oct 2020 Link

  8. A Roy, A L Chakraborty, “Intensity modulation-normalized calibration-free 1f and 2f wavelength modulation spectroscopy”, IEEE Sensors Journal, 20(21), pp 12691-12701, Nov 2020 Link 

  9. A Roy, R S Chawhan, A L Chakraborty, "Field deployment of a 4320 nm quantum cascade laser-based TDLS system to compare the background CO2 levels in Mt. Abu with foreground measurements in Gandhinagar, India," SPIE Optical Engineering 59(2), 024110 (2020) Link

  10. P Ghosh, A Kar, S Khandelwal, D Vyas, A Q Mir, A L Chakraborty, R S Hegde, S Sharma, A Dutta, and S Khatua, “Plasmonic CoO-decorated Au nanorods for photoelectrocatalytic water oxidation”, ACS Applied Nano Materials, 2(9), 5795-5803, (2019) Link

  11. A Roy, R S Chawhan, R Patel, S Varadharajan, L M Tiwari, A L Chakraborty, C Ghoroi and G Srivastava, “Quantifying the CO and CO2 mole fraction in the plume of an aerosol-based fire extinguishing agent using 4560 nm and 4320 nm QCLs”, IEEE Sensors Journal, 19(21), Nov 2019 Link

  12. C K Jha, S Agarwal, A L Chakraborty and C Shirpurkar, "An FBG-based sensing glove to measure dynamic finger flexure with angular resolution of 0.1 degree and for speeds up to 80 degrees/s", IEEE/OSA Journal of Lightwave Technology, (Special Issue of OFS-26, Oct 2018), 37(18), Sep 15, 2019 Link

  13. A Roy, N K Sharma, A L Chakraborty and A Upadhyay, “Measurement of atmospheric carbon dioxide and water vapour in urban built-up areas in the Gandhinagar-Ahmedabad region in India using a portable tunable diode laser spectroscopy system”, Applied Optics (Feature issue: Near- to mid-IR (1–13 μm) III-V Semiconductor Lasers), 56(31), H57-H66, Nov 2017 Link

  14. Zarin A S, A L Chakraborty and A Upadhyay, “Absolute and non-invasive measurements of CO2 emission from batch culture of E coli using calibration-free 2f wavelength modulation spectroscopy applied to a 2004 nm VCSEL”, Optics Letters, 42(11), 2138-2141 (2017) Link

  15. A Roy, A L Chakraborty and C K Jha, “Fiber Bragg grating interrogation using wavelength modulated tunable DFB lasers and a fiber-optic Mach-Zehnder interferometer", Applied Optics, 56(17), 3562-3569 (2017) Link

  16. A Upadhyay, D Wilson, M Lengden, A L Chakraborty, G Stewart and W Johnstone, "Calibration-free WMS measurement of gas parameters with in-situ real-time laser parameter characterization using continuous wave DFB-QCL, VCSEL and DFB lasers", IEEE Photonics Journal, 9(2), April 2017 Link

  17. A Upadhyay, A L Chakraborty, "Calibration-free 2f WMS with in situ real time characterization of a laser modulated at its phase quadrature and with 2f RAM nulling", Optics Letters, 40(17), pp. 4086-4089, (2015) Link

  18. A Upadhyay, A L Chakraborty, “Wavelength modulation spectroscopy of methane using the residual amplitude modulation method implemented at the phase quadrature frequency of a 1650 nm laser diode", IEEE Sensors Journal, 15(2), pp 1153-1160, (2015) Link

  19. A L Chakraborty, K Ruxton, W Johnstone, “Suppression of intensity modulation contributions to signals in second harmonic wavelength modulation spectroscopy”, Optics Letters, 35(14), pp. 2400-2402 (2010) Link

  20. K Ruxton, A L Chakraborty, W Johnstone, M Lengden, G Stewart, K Duffin, "Tunable diode laser spectroscopy with wavelength modulation: elimination of residual amplitude modulation in a phasor decomposition approach", Sensors and Actuators B: Chemical, 150(1), pp 367-375, September 2010 Link

  21. I Armstrong, W Johnstone, K Duffin, M Lengden, A L Chakraborty and K Ruxton, "Detection of CH4 in the mid-IR using difference frequency generation with tunable diode laser spectroscopy", IEEE Journal of Lightwave Technology, 28(10), pp 1435-1442, February 2010 Link

  22. A L Chakraborty, K Ruxton and W Johnstone, “Influence of the wavelength-dependence of fiber couplers on the background signal in wavelength modulation spectroscopy with RAM-nulling”, Optics Express, 18(1), pp 267-280 (2010) Link

  23. A L Chakraborty, K Ruxton, W Johnstone, M Lengden and K Duffin, “Elimination of residual amplitude modulation in tunable diode laser wavelength modulation spectroscopy using an optical fiber delay line”, Optics Express, 17(12), pp. 9602-9607 (2009) Link

  24. A L Chakraborty, R K Sharma, M K Saxena, S Kher, “Compensation for temperature dependence of Stokes signal and dynamic self-calibration of a Raman distributed temperature sensor”, Optics Communications, 274(2), pp 396-402, 15 June 2007 Link

  25. A L Chakraborty, S Kher, S Chaubey, T P S Nathan, “Bi-directional frequency-domain digital filtering to simultaneously improve temperature resolution and eliminate spatial inaccuracy of a distributed temperature sensor”, Optical Engineering, 43(11), pp 2724-2729, Nov 2004 Link

  26. S Kher, G Srikanth, S Chaubey, A L Chakraborty, T P S Nathan, D D Bhawalkar, “Design, development and studies on a Raman-based fiber-optic distributed temperature sensor”, Current Science, 83(11), pp 1365-8, Dec 2002

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Conference papers​​

  1. R Jana, N V George and A L Chakraborty, "An FBG-based throat microphone - influence of the placement of the FBG on the intelligibility of recorded speech", International Conference on Optics, Photonics and Quantum Information (OPTIQ 2023) Optical Society of India 11-13 Dec, 2023 BEST PAPER AWARD

  2. S De, Malavika P D, A L Chakraborty, "In-situ monitoring of nitric oxide in vehicle exhaust using a robust 1f wavelength modulation spectroscopy technique", International Conference on Optics, Photonics and Quantum Information (OPTIQ 2023) Optical Society of India 11-13 Dec, 2023 BEST PAPER AWARD

  3. S De, D Paul, K T V Grattan, and A L Chakraborty, “Design and validation of a vehicle-mounted near-IR 1f wavelength modulation spectroscopy system for on-road measurements of ambient water vapour in Gandhinagar-Ahmedabad, India", 2023 IEEE SENSORS, Vienna, Austria, 2023, pp. 1-4, (Poster session A2P-14: Optical Sensors - A), 29 Oct - 1 Nov, 2023 Link

  4. S De, D Paul, K T V Grattan, and A L Chakraborty, “Mid-infrared quantum cascade laser-based wavelength modulation spectroscopy for the detection of greenhouse gases and NOx”, (oral), Photonics 2023, 5-8 July, 2023, Bangalore

  5. P Ghosh, A L Chakraborty and S Khatua, “Excitation wavelength-dependent study to investigate the mechanism of light-induced spectral redshift of a single gold nanorod”, 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference, (CLEO/Europe-EQEC 2023), 26-30 June 2023, Munich

  6. S De, D Paul, K T V Grattan, P Sharma, S Tomar and A L Chakraborty, “Trace gas detection using wavelength modulation spectroscopy as an approach to monitor cabin air quality in human spaceflight mission”, oral presentation, International Academy of Astronautics (IAA), (SMOPS 2023), 8-9 June, 2023, Bangalore

  7. D Paul, S De and A L Chakraborty, ”Fully automated, real-time monitoring of ambient water vapour using a compact 1392 nm tunable diode laser-based system”, IEEE Applied Sensing Conference (IEEE APSCON 2023), 23-25 Jan, 2023, Bengaluru

  8. D Paul, S De, K T V Grattan and A L Chakraborty, "A compact tunable diode laser-based system for continuous monitoring of ambient water vapour”, Live Demo Zone, IEEE Applied Sensing Conference (IEEE APSCON 2023), 23-25 Jan, 2023, Bengaluru

  9. S De, D Paul and A L Chakraborty, “A field-deployable R1f /ΔI1 wavelength modulation spectroscopy system for automated high time-resolution trace gas sensing", National Laser Symposium (NLS-31), 3-6 Dec 2022, IIT Kharagpur, India

  10. S De, D Paul, K T V Grattan and A L Chakraborty, “Compact and portable near-IR and mid-IR wavelength modulation spectroscopy systems for real-time measurements of water vapour and carbon dioxide”, XLV Symposium of the Optical Society of India, Conference on Optics, Photonics & Quantum Optics (COPaQ 2022), 10-13 Nov, 2022, IIT Roorkee

  11. P Ghosh, R Panigrahi, S Khatua and A L Chakraborty, “Single particle tuning of localized surface plasmon resonance of gold nanorods immersed in ascorbic acid for multi-channel biosensing platform”, XLV Symposium of the Optical Society of India, Conference on Optics, Photonics & Quantum Optics (COPaQ 2022), 10-13 Nov, 2022, IIT Roorkee

  12. S De, D Paul, K T V Grattan and A L Chakraborty, "Trace gas sensing using the R1f /ΔI1 wavelength modulation spectroscopy technique", Field Laser Applications in Industry and Research (FLAIR 2022), 12-16 Sep 2022, Aix Les Bains, France

  13. K Jajoria, C K Jha, A L Chakraborty, H Shekhar, "Passive cavitation detection using a fiber Bragg grating sensor", 21st International Symposium on Therapeutic Ultrasound (ISTU 2022), Toronto, Canada, June 7-10, 2022

  14. C K Jha, A L Chakraborty, "A fibre Bragg grating sensor-based instrumented glove for virtual rehabilitation applications", OFC Demo Zone, Presentation Number: M3Z.1, Optical Fiber Communication Conference and Exhibition (OFC 2022), San Diego, California, USA, 6 - 10 March 2022

  15. C K Jha, K Jajoria, A L Chakraborty and H Shekhar, "Detection of ultrasound up to 10 MHz frequency using an FBG sensor", 5th IEEE Workshop on Recent Advances in Photonics (IEEE WRAP 2022), 4-6 Mar 2022, IIT Bombay

  16. S De, Ramya S and A L Chakraborty, "Measurement of the mole fraction of acetylene at locations up to 5 km away from a fiber-coupled wavelength modulated 1531.52 nm tunable laser diode", 44th OSI Symposium on Frontiers in Optics and Photonics 2021, (FOP21), 24-27 Sep, 2021, IIT Delhi

  17. C K Jha, K Jajoria, A L Chakraborty and H Shekhar, “A fiber Bragg grating-based optical probe to detect MHz-frequency ultrasound”, in the Acoustics in Focus, 180th Meeting of the Acoustical Society of America, New York, US, June 8-10, 2021

  18. Zarin A. S, A. L. Chakraborty and S. Khatua, "Correlating microbial bioluminescence to the different phases of growth using a 2004 nm VCSEL-based 2f wavelength modulation spectroscopy," 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), 2021, pp. 1-1, Link

  19. P Ghosh, V Thambi , A Kar , A L Chakraborty and S Khatua, "Light controlled in-situ tuning of plasmon resonance of a gold nanorod in sodium dodecyl sulphate", submitted to 25th International Commission for Optics (ICO-25) and the Conference of International Society on Optics Within Life Sciences (OWLS-16), 31 Aug - 4 Sep 2020, Dresden, Germany

  20. C K Jha, S S Bhattacharjee, J N Chauhan, A L Chakraborty, and N V George, "Speech quality estimation of an FBG sensor-based contact microphone in noisy environment," in Optical Fiber Sensors Conference 2020 (OFS 2020) Special Edition, G. Cranch, A. Wang, M. Digonnet, and P. Dragic, eds., OSA Technical Digest (Optical Society of America, 2020), paper W4.44 Link

  21. P Ghosh, A Kar, V Thambi, A L Chakraborty and S Khatua, "Large and controllable light-induced shift of the longitudinal surface plasmon resonance of gold nanorods submerged in hydroquinone solution", IEEE WRAP 2019, 13-14 Dec 2019, IIT Guwahati

  22. C K Jha and A L Chakraborty, "Real-time monitoring of ten fingers joints using a fiber Bragg grating-based sensor glove for virtual rehabilitation", IEEE WRAP 2019, 13-14 Dec 2019, IIT Guwahati

  23. A Roy and A L Chakraborty, "Quantum cascade laser-based in situ measurement of atmospheric CO and CO2 in Gandhinagar using 1f and 2f wavelength modulation spectroscopy", IEEE WRAP 2019, 13-14 Dec 2019, IIT Guwahati

  24. C K Jha, O Sinha, A L Chakraborty, “A fiber Bragg grating sensor-based wearable system to detect the pre-dicrotic and dicrotic notch in the arterial pulse pressure waveform”, 2019 IEEE 16th India Council International Conference (INDICON 2019), 13-15 Dec 2019,  Rajkot, India Link

  25. A Roy, A L Chakraborty and K T V Grattan, "A 1531.52 nm tunable diode laser-based system for high-sensitivity remote monitoring of acetylene and ammonia leaks in industrial plants", Proceedings of the International Conference on Optics and Electro-Optics (ICOL 2019), 19-22 Oct 2019, Dehradun, India, Editors: Singh, K., Gupta, A.K., Khare, S., Dixit, N., Pant, K. (Eds.), 19-22 Oct 2019, Dehra Dun, India (oral presentation) Link

  26. P Ghosh, A Kar, A L Chakraborty, S Sharma, A Dutta and S Khatua, “Photoelectrochemical water splitting with cobalt oxide coated gold nanorods under visible excitation”, poster EG-P.6, CLEO Europe-EQEC 2019, 23-27 June 2019, Munich, Germany

  27. P Ghosh, G Joshi, A L Chakraborty, R Hegde, S Khatua, “Synthesis of gold nanodroplets with field enhancement of 10^5 at their tips using a simple wet-chemical method”, poster EH-P.12, CLEO Europe-EQEC 2019, 23-27 June 2019, Munich, Germany

  28. P Ghosh, A Tripathi, K Bhagtani, V Thambi, A L Chakraborty and S Khatua, "Synthesis of cobalt-coated gold nanorods using a wet chemical method", International Conference on Fiber Optics and Photonics (PHOTONICS 2018), 12-15 Dec 2018, New Delhi

  29. Zarin A S, A L Chakraborty, S Khatua, "Non-invasive and simultaneous high time-resolution monitoring of CO2 emission and bio-luminescence in a batch culture of Photobacterium leiognathi", International Conference on Fiber Optics and Photonics (PHOTONICS 2018), 12-15 Dec 2018, New Delhi (oral presentation)

  30. A Roy, R S Chawhan and A L Chakraborty, "A portable mid-infrared quantum cascade laser-based TDLS system for atmospheric carbon dioxide measurement: results of a week-long expedition to Mount Abu", International Conference on Fiber Optics and Photonics (PHOTONICS 2018), 12-15 Dec 2018, New Delhi BEST PAPER AWARD

  31. S Chawhan, A Roy and A L Chakraborty, "Development of a compact and light-weight 1392 nm tunable diode laser-based system for real-time ambient water vapour measurements", International Conference on Fiber Optics and Photonics (PHOTONICS 2018), 12-15 Dec 2018, New Delhi

  32. A K Shukla, K K Dey and A L Chakraborty, “Debye-Sear effect in active liquids”, 3rd International Conference on Soft Materials (ICSM 2018), MNIT Jaipur, India, 9-14 Dec 2018

  33. C K Jha and A L Chakraborty, "A fiber Bragg grating strain sensor-based glove to accurately measure the bend angle of the finger flexed at the proximal inter-phalangeal joint", IEEE Sensors 2018 (A3L-C: Optical Fiber II Lecture session), 28-31 Oct 2018, New Delhi, India (oral presentation) Link

  34. A Roy, R S Chawhan, A L Chakraborty, "A 4320 nm quantum cascade laser-based TDLS system for long-term measurement of ambient carbon dioxide levels at Gandhinagar in western India", Field Laser Applications in Industry and Research (FLAIR 2018), 10-14 Sep 2018, Italy

  35. C K Jha, A L Chakraborty and S Agarwal, "A fiber Bragg grating-based sensing glove with a sensitivity of 18.45 pm/degree to accurately assess finger flexure", 26th International Conference on Optical Fibre Sensors, (OFS-26), 24-28 Sep 2018, Lausanne, Switzerland (oral presentation), Link 
    SPIE OUTSTANDING RESULTS AWARD

  36. Zarin AS and A L Chakraborty, "Rapid and non-invasive anti-microbial susceptibility testing using tunable diode laser spectroscopy", International Conference on Cell Biology (ICCB 2018), 27-31 Jan 2018, Hyderabad, India

  37. P Ghosh, V Thambi, S Khatua and A L Chakraborty, “Synthesis of gold nanorods with tunable surface plasmon resonance for near-infrared bio-sensing applications”, IEEE Workshop of Recent Advances in Photonics (WRAP 2017), 18-19 Dec 2017, Hyderabad, India, Link            BEST PAPER AWARD

  38. A Roy, N K Sharma, A L Chakraborty, A Upadhyay, "Current scenario of ambient carbon dioxide levels at multiple locations in urban Ahmedabad revealed by a 2004 nm tunable diode laser spectroscopy system", IEEE Sensors 2017, Optical Sensors and Systems II Poster session C2P-J, Glasgow, UK, Oct 2017, Link

  39. Zarin A S, A L Chakraborty, A Upadhyay, "Detecting metabolic carbon dioxide using a tunable laser for non-invasive monitoring of growth of bacterial pathogens", oral presentation (1617/CL-4.6), CLEO Europe- EQEC 2017, 25-29 June 2017, Munich, Germany Link

  40. A Roy, A L Chakraborty, C K Jha, “Fiber Bragg grating interrogation using a wavelength modulated 1651 nm tunable distributed feedback laser and a fiber ring resonator for wearable biomedical sensors”, 25th International Conference on Optical Fiber Sensors (OFS-25), 25-28 April 2017, Korea

  41. A Roy, A Upadhyay and A L Chakraborty, "Open-path CO2 measurement in indoor and outdoor environments in the Ahmedabad-Gandhinagar area using a 2004 nm tunable VCSEL", oral presentation at International Conference on Fiber Optics and Photonics (Photonics 2016), 4-8 Dec 2016, IIT Kanpur Link

  42. A Upadhyay, P Chakraborty, A Roy, A L Chakraborty, "Measurement of carbon dioxide concentrations in urban built-up areas using a portable 2004 nm VCSEL-based calibration-free TDLS system with wireless data logging", Field Laser Applications in Industry and Research (FLAIR 2016), Aix les Bains, France, 12-16 Sep 2016

  43. A Roy, A Upadhyay, A L Chakraborty, "High-sensitivity remote detection of atmospheric pollutants and greenhouse gases at low ppm levels using near-infrared tunable diode lasers", Proc. SPIE 9876, Remote Sensing of the Atmosphere, Clouds, and Precipitation VI, 98761W, 4-7 April 2016, New Delhi (May 5, 2016) Link

  44. Zarin AS and A L Chakraborty, “Absolute concentration measurements of bacterial CO2 emission using a 2004 nm vertical cavity surface emitting tunable diode laser”, 2015 IEEE Workshop on Recent Advances in Photonics (WRAP-2015), 13-16 Dec 2015, IISc Bangalore

  45. V Gandhi, S Heda, R Anand, Zarin A S, A Upadhyay and A L Chakraborty, “Rapid detection of CO2 using a Raspberry Pi-based field-deployable tunable diode laser spectroscopy system”, International Conference on Microwave and Photonics (ICMAP 2015), 13-15 Dec 2015, ISM Dhanbad

  46. R Mallik, A Joshi, A Gupta and A L Chakraborty, "Using tunable laser diodes to classify cold drinks brands and interrogate an FBG-based temperature sensor", in 12th International Conference on Fiber Optics and Photonics (Photonics 2014), OSA Technical Digest (online) (Optical Society of America, 2014), paper T4B.5. Link

  47. A Upadhyay, A L Chakraborty, “Accurate recovery of a methane absorption line using the residual amplitude modulation method implemented at the phase quadrature frequency of a laser diode”, Field Laser Applications in Industry and Research (FLAIR 2014), Florence, Italy, 5-9 May 2014

  48. A Upadhyay, A L Chakraborty, “Optimization of calibration-free wavelength modulation spectroscopy technique for gas parameter measurement”, International Conference on Optics and Optoelectronics (ICOL 2014), 38th Symposium of the Optical Society of India, IRDE Dehra Dun, 3-5 March 2014

  49. A Gupta, A Upadhyay, A L Chakraborty, “Interrogation of an FBG-based temperature measurement system using a tunable diode laser and a fiber ring resonator”, 22nd DAE-BRNS National Laser Symposium (NLS-22), Manipal University, 8-11 Jan 2014

  50. A Upadhyay, A Dighe and A L Chakraborty, “Rapid detection of methane, carbon dioxide and ammonia for harsh environments using tunable diode laser spectroscopy”, International Conference on Microwave and Photonics (ICMAP 2013), 13-15 Dec 2013, ISM Dhanbad. Link

  51. A Upadhyay and A L Chakraborty, "Detection of methane at 1650 nm and carbon dioxide at 2004 nm using tunable diode laser spectroscopy", 12th International Conference on Fiber Optics and Photonics, (Photonics 2012), 11-15 Dec 2012, Chennai, India

  52. A Upadhyay, V V Katre and A L Chakraborty, "Tunable diode laser spectroscopy with electronically controlled background RAM nulling", Proceedings Volume 8421, OFS 2012 22nd International Conference on Optical Fiber Sensors (OFS-22), 84216H, 15-19 Oct, 2012, Beijing, China, Link

  53. A L Chakraborty, “Calibration-free approaches in tunable diode laser spectroscopy of gases for calibration-free measurement of concentration and pressure”, 20th National Laser Symposium (NLS-20), 9-12 Jan 2012, Chennai, India

  54. A L Chakraborty, “Calibration-free approaches in tunable diode laser spectroscopy of gases for industrial applications”, Frontiers in Optics and Photonics (FOP-11), 37th OSI Symposium of Optical Society of India (OSI), 3-5 Dec 2011, New Delhi, India

  55. A L Chakraborty and W Johnstone, “Calibration-free 2f wavelength modulation spectroscopy using normalization by the nonlinear intensity modulation for quantitative industrial gas measurements”, Field Laser Applications in Industry and Research (FLAIR 2011), 13-17 Sep 2011, Murnau, Germany

  56. A L Chakraborty and W Johnstone, “Tunable diode laser spectroscopy of methane for calibration-free industrial measurement of concentration and pressure”, Contemporary Trends in Optics and Optoelectronics, 36th OSI Symposium of Optical Society of India (OSI), 17-19 Jan 2011, Thiruvananthapuram, India

  57. A L Chakraborty, W Johnstone, “Quantitative wavelength modulation spectroscopy for gas measurements – elimination of laser intensity modulation effects”, Proceedings Volume 8173, (Photonics 2010): Tenth International Conference on Fiber Optics and Photonics; 81731X (2011) , 11-15 December 2010, IIT Guwahati, India Link

  58. G Stewart, K Ruxton, A L Chakraborty and W Johnstone, “Tunable diode laser spectroscopy with wavelength modulation: an overview of current techniques and motivations”, PHOTON 10, 23-26 Aug 2010, University of Southampton, United Kingdom

  59. K Ruxton, A L Chakraborty, A J McGettrick, K Duffin, W Johnstone and G Stewart, “Recent advance in tunable diode laser spectroscopy with background RAM Nulling for industrial applications”, 20th International Conference on Optical Fibre Sensors (OFS-20), 5-9 Oct 2009, Edinburgh, UK Link

  60. A L Chakraborty, K Ruxton and W Johnstone, “Tunable diode laser spectroscopy with RAM nulling – current status and future possibilities”, Field Laser Applications in Industry and Research (FLAIR 2009), 6-11 Sep 2009, Grainau, Germany

  61. K Ruxton, A L Chakraborty, A J McGettrick, K Duffin, W Johnstone and G Stewart, “Diode laser spectroscopy using a calibration-free phasor decomposition approach with RAM nulling”, 7th International Conference on Tunable Diode Laser Spectroscopy (TDLS-2009), 13-17 July 2009, Zermatt, Switzerland

  62. I Armstrong, A L Chakraborty, K Ruxton, and W Johnstone, “An investigation of TDLS modulation schemes as applied to the Mid-IR spectral region by difference frequency generation in PPLN”, 7th International Conference on Tunable Diode Laser Spectroscopy (TDLS-2009), 13-17 July 2009, Zermatt, Switzerland

  63. A L Chakraborty, K Ruxton, W Johnstone, M Lengden and K Duffin, “Elimination of residual amplitude modulation in TDLS-WMS”, Conference on Lasers and Electro-Optics/ European Quantum Electronics Conference (CLEO Europe/EQEC-2009), 14-19 June 2009, Munich, Germany Link

  64. A L Chakraborty, S Kher, A K Nath, “Dynamic self-calibration of a Raman distributed temperature sensor”, 8th International Conference on Optoelectronics, Fiber Optics and Photonics, (Photonics 2006), Dec 13-16, 2006, Hyderabad, India    BEST PAPER AWARD

  65. A L Chakraborty, S Kher, S Chaubey, T P S Nathan, “Application of bidirectional frequency-domain digital filtering to simultaneously improve the temperature resolution and eliminate spatial inaccuracy of a distributed temperature sensor”, National Symposium on Instrumentation (NSI-28), G. B. Pant University of Agriculture and Technology, Pantnagar, 2003

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