Pardeep Kumar

09 March 2026

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Education / Work History

• RIKEN Molecular Spectroscopy Lab (2015-present)
• Ph.D. Scholar, IIT Kanpur (2008-2014)

Thesis Abstract

Thermal Lens Study of Strong Absorbing Samples with Femtosecond Laser Pulse Train

The present thesis focuses on the study of chemical materials through thermal lens techniques with femtosecond laser pulse train. To study chemical materials, I utilized two main experimental set-ups that were constructed and aligned in our laboratory. One of the setups is based on the two-color pump-probe mode-mismatched thermal lens Z-scan technique, and the other one is based on the Time resolved thermal lens technique. TL signal of a homologous series of primary alcohols shows unusual behavior along the alcohol series when compared to the expected TL signal calculated from physical parameters. Time resolved TL studies indicate the importance of convective mode of heat transfer for highly absorbing samples. The inclusion of the convection term in the TL study, gives an insight of the molecular properties of the system. The molecular heat convection strongly depends on molecular size and structure. This thesis has also included the Soret phenomenon, which is a very important physical phenomenon. Our study shows that the Soret effect depends on the molecular structure as well as on the molecular mass of the constituent components.

Research Topic / Interest

Contact me to know my current interests.

Publications

These include only those published in our lab.

1. Effect of Isotope Substitution in Binary Liquids with Thermal-Lens Spectroscopy. I. Bhattacharyya, P. Kumar, and D. Goswami, Chemical Physics Letters 598, 35–38 (2014) [BibTeX]

    BibTeX: @article{bhattacharyyaEffectIsotopeSubstitution2014,
     title = {Effect of Isotope Substitution in Binary Liquids with {{Thermal-Lens}} Spectroscopy},
     author = {Bhattacharyya, Indrajit and Kumar, Pardeep and Goswami, Debabrata},
     year = {2014},
     month = apr,
     journal = {Chemical Physics Letters},
     volume = {598},
     pages = {35--38},
     issn = {0009-2614},
     doi = {10/f5xrr2},
     urldate = {2019-08-02},
     annotation = {GSCC: 0000009 \\
     8 citations (Crossref) [2024-05-28]\\
     00000}
   }
   

2. Probing Intermolecular Interaction through Thermal-Lens Spectroscopy. I. Bhattacharyya, P. Kumar, and D. Goswami, The Journal of Physical Chemistry B 115(2), 262–268 (2011) [BibTeX]

    BibTeX: @article{bhattacharyyaProbingIntermolecularInteraction2011,
     title = {Probing {{Intermolecular Interaction}} through {{Thermal-Lens Spectroscopy}}},
     author = {Bhattacharyya, Indrajit and Kumar, Pardeep and Goswami, Debabrata},
     year = {2011},
     month = jan,
     journal = {The Journal of Physical Chemistry B},
     volume = {115},
     number = {2},
     pages = {262--268},
     issn = {1520-6106},
     doi = {10/d9mz5f},
     urldate = {2019-08-14},
     annotation = {GSCC: 0000040 \\
     30 citations (Crossref) [2024-05-28]\\
     00018}
   }
   

3. Thermal-Lens Spectroscopy in Binary Liquids Mixtures. I. Bhattacharyya, P. Kumar, and D. Goswami, in Frontiers in Optics 2010/Laser Science XXVI (2010), Paper FWX1 (Optical Society of America, 2010), p. FWX1 [BibTeX]

    BibTeX: @inproceedings{bhattacharyyaThermalLensSpectroscopyBinary2010,
     title = {Thermal-{{Lens}} Spectroscopy in Binary Liquids Mixtures},
     booktitle = {Frontiers in {{Optics}} 2010/{{Laser Science XXVI}} (2010), Paper {{FWX1}}},
     author = {Bhattacharyya, Indrajit and Kumar, Pardeep and Goswami, Debabrata},
     year = {2010},
     month = oct,
     pages = {FWX1},
     publisher = {Optical Society of America},
     doi = {10/gf6c8z},
     urldate = {2019-08-14},
     copyright = {\&\#169; 2010 Optical Society of America},
     langid = {english},
     annotation = {GSCC: 0000040 \\
     0 citations (Crossref) [2024-05-28]\\
     00000}
   }
   

4. Measurement Constraints in Laser Based Thermal Lens Experiments. D. Goswami and P. Kumar, in International Conference on Optics and Photonics 2015 (International Society for Optics and Photonics, 2015), 9654, p. 965406 [BibTeX]

    BibTeX: @inproceedings{goswamiMeasurementConstraintsLaser2015,
     title = {Measurement Constraints in Laser Based Thermal Lens Experiments},
     booktitle = {International {{Conference}} on {{Optics}} and {{Photonics}} 2015},
     author = {Goswami, Debabrata and Kumar, Pardeep},
     year = {2015},
     month = jun,
     volume = {9654},
     pages = {965406},
     publisher = {{International Society for Optics and Photonics}},
     doi = {10/gf5msn},
     urldate = {2019-08-01},
     annotation = {GSCC: 0000067 \\
     0 citations (Crossref) [2024-05-28]\\
     00000}
   }
   

5. Effect of Molecular Structural Isomers in Thermal Lens Spectroscopy. P. Kumar, S. Dinda, and D. Goswami, Chemical Physics Letters 601, 163–167 (2014) [BibTeX]

    BibTeX: @article{kumarEffectMolecularStructural2014,
     title = {Effect of Molecular Structural Isomers in Thermal Lens Spectroscopy},
     author = {Kumar, Pardeep and Dinda, Sirshendu and Goswami, Debabrata},
     year = {2014},
     month = may,
     journal = {Chemical Physics Letters},
     volume = {601},
     pages = {163--167},
     issn = {00092614},
     doi = {10/gf6bk6},
     urldate = {2019-08-12},
     langid = {english},
     annotation = {GSCC: 0000020 \\
     18 citations (Crossref) [2024-05-28]\\
     00000}
   }
   

6. Importance of Molecular Heat Convection in Time Resolved Thermal Lens Study of Highly Absorbing Samples. P. Kumar, A. Khan, and D. Goswami, Chemical Physics 441, 5–10 (2014) [BibTeX]

    BibTeX: @article{kumarImportanceMolecularHeat2014,
     title = {Importance of Molecular Heat Convection in Time Resolved Thermal Lens Study of Highly Absorbing Samples},
     author = {Kumar, Pardeep and Khan, Arbaz and Goswami, Debabrata},
     year = {2014},
     month = sep,
     journal = {Chemical Physics},
     volume = {441},
     pages = {5--10},
     issn = {0301-0104},
     doi = {10/f6kr7q},
     urldate = {2019-08-01},
     annotation = {GSCC: 0000035 \\
     31 citations (Crossref) [2024-05-28]\\
     00000}
   }
   

7. Importance of Molecular Structure on the Thermophoresis of Binary Mixtures. P. Kumar and D. Goswami, The Journal of Physical Chemistry B 118(51), 14852–14859 (2014) [BibTeX]

    BibTeX: @article{kumarImportanceMolecularStructure2014,
     title = {Importance of {{Molecular Structure}} on the {{Thermophoresis}} of {{Binary Mixtures}}},
     author = {Kumar, Pardeep and Goswami, Debabrata},
     year = {2014},
     month = dec,
     journal = {The Journal of Physical Chemistry B},
     volume = {118},
     number = {51},
     pages = {14852--14859},
     issn = {1520-6106},
     doi = {10/gf5ms6},
     urldate = {2019-08-01},
     annotation = {GSCC: 0000015 \\
     6 citations (Crossref) [2024-05-28]\\
     00000}
   }
   

8. Thermal-Lens Spectroscopy in Binary Liquids Mixtures: Effect of Isotope Substitution. P. Kumar, I. Bhattacharyya, and D. Goswami, in Frontiers in Optics 2011/Laser Science XXVII (2011), Paper JTuA25 (Optical Society of America, 2011), p. JTuA25 [BibTeX]

    BibTeX: @inproceedings{kumarThermalLensSpectroscopyBinary2011,
     title = {Thermal-{{Lens Spectroscopy}} in {{Binary Liquids Mixtures}}: {{Effect}} of {{Isotope Substitution}}},
     shorttitle = {Thermal-{{Lens Spectroscopy}} in {{Binary Liquids Mixtures}}},
     booktitle = {Frontiers in {{Optics}} 2011/{{Laser Science XXVII}} (2011), Paper {{JTuA25}}},
     author = {Kumar, Pardeep and Bhattacharyya, Indrajit and Goswami, Debabrata},
     year = {2011},
     month = oct,
     pages = {JTuA25},
     publisher = {Optical Society of America},
     doi = {10/gf5nqg},
     urldate = {2019-08-02},
     copyright = {\&\#169; 2011 Optical Society of America},
     langid = {english},
     annotation = {GSCC: 0000001 \\
     0 citations (Crossref) [2024-05-28]\\
     00000}
   }
   

9. Unusual Behavior of Thermal Lens in Alcohols. P. Kumar, S. Dinda, A. Chakraborty, and D. Goswami, Physical Chemistry Chemical Physics 16(24), 12291–12298 (2014) [BibTeX]

    BibTeX: @article{kumarUnusualBehaviorThermal2014,
     title = {Unusual Behavior of Thermal Lens in Alcohols},
     author = {Kumar, Pardeep and Dinda, Sirshendu and Chakraborty, Atanu and Goswami, Debabrata},
     year = {2014},
     journal = {Physical Chemistry Chemical Physics},
     volume = {16},
     number = {24},
     pages = {12291--12298},
     doi = {10/gf5npt},
     urldate = {2019-08-02},
     langid = {english},
     annotation = {GSCC: 0000019 \\
     17 citations (Crossref) [2024-05-28]\\
     00000}
   }
   

10. Effect of Isotope Substitution in Binary Liquids with Thermal-Lens Spectroscopy. I. Bhattacharyya, P. Kumar, and D. Goswami, Chemical Physics Letters 598, 35–38 (2014) [BibTeX]

     BibTeX: @article{bhattacharyyaEffectIsotopeSubstitution2015,
      title = {Effect of Isotope Substitution in Binary Liquids with {{Thermal-Lens}} Spectroscopy},
      author = {Bhattacharyya, Indrajit and Kumar, Pardeep and Goswami, Debabrata},
      year = {2014},
      month = apr,
      journal = {Chemical Physics Letters},
      volume = {598},
      pages = {35--38},
      issn = {0009-2614},
      doi = {10/f5xrr2},
      urldate = {2019-08-02},
      annotation = {GSCC: 0000009 \\
      8 citations (Crossref) [2024-05-28]\\
      00000}
    }
    

11. Probing Intermolecular Interaction through Thermal-Lens Spectroscopy. I. Bhattacharyya, P. Kumar, and D. Goswami, The Journal of Physical Chemistry B 115(2), 262–268 (2011) [BibTeX]

     BibTeX: @article{bhattacharyyaProbingIntermolecularInteraction2012,
      title = {Probing {{Intermolecular Interaction}} through {{Thermal-Lens Spectroscopy}}},
      author = {Bhattacharyya, Indrajit and Kumar, Pardeep and Goswami, Debabrata},
      year = {2011},
      month = jan,
      journal = {The Journal of Physical Chemistry B},
      volume = {115},
      number = {2},
      pages = {262--268},
      issn = {1520-6106},
      doi = {10/d9mz5f},
      urldate = {2019-08-14},
      annotation = {GSCC: 0000040 \\
      30 citations (Crossref) [2024-05-28]\\
      00018}
    }
    

12. Thermal-Lens Spectroscopy in Binary Liquids Mixtures. I. Bhattacharyya, P. Kumar, and D. Goswami, in Frontiers in Optics 2010/Laser Science XXVI (2010), Paper FWX1 (Optical Society of America, 2010), p. FWX1 [BibTeX]

     BibTeX: @inproceedings{bhattacharyyaThermalLensSpectroscopyBinary2011,
      title = {Thermal-{{Lens}} Spectroscopy in Binary Liquids Mixtures},
      booktitle = {Frontiers in {{Optics}} 2010/{{Laser Science XXVI}} (2010), Paper {{FWX1}}},
      author = {Bhattacharyya, Indrajit and Kumar, Pardeep and Goswami, Debabrata},
      year = {2010},
      month = oct,
      pages = {FWX1},
      publisher = {Optical Society of America},
      doi = {10/gf6c8z},
      urldate = {2019-08-14},
      copyright = {\&\#169; 2010 Optical Society of America},
      langid = {english},
      annotation = {GSCC: 0000040 \\
      0 citations (Crossref) [2024-05-28]\\
      00000}
    }
    

13. Measurement Constraints in Laser Based Thermal Lens Experiments. D. Goswami and P. Kumar, in International Conference on Optics and Photonics 2015 (International Society for Optics and Photonics, 2015), 9654, p. 965406 [BibTeX]

     BibTeX: @inproceedings{goswamiMeasurementConstraintsLaser2016,
      title = {Measurement Constraints in Laser Based Thermal Lens Experiments},
      booktitle = {International {{Conference}} on {{Optics}} and {{Photonics}} 2015},
      author = {Goswami, Debabrata and Kumar, Pardeep},
      year = {2015},
      month = jun,
      volume = {9654},
      pages = {965406},
      publisher = {{International Society for Optics and Photonics}},
      doi = {10/gf5msn},
      urldate = {2019-08-01},
      annotation = {GSCC: 0000067 \\
      0 citations (Crossref) [2024-05-28]\\
      00000}
    }
    

14. Effect of Molecular Structural Isomers in Thermal Lens Spectroscopy. P. Kumar, S. Dinda, and D. Goswami, Chemical Physics Letters 601, 163–167 (2014) [BibTeX]

     BibTeX: @article{kumarEffectMolecularStructural2015,
      title = {Effect of Molecular Structural Isomers in Thermal Lens Spectroscopy},
      author = {Kumar, Pardeep and Dinda, Sirshendu and Goswami, Debabrata},
      year = {2014},
      month = may,
      journal = {Chemical Physics Letters},
      volume = {601},
      pages = {163--167},
      issn = {00092614},
      doi = {10/gf6bk6},
      urldate = {2019-08-12},
      langid = {english},
      annotation = {GSCC: 0000020 \\
      18 citations (Crossref) [2024-05-28]\\
      00000}
    }
    

15. Importance of Molecular Heat Convection in Time Resolved Thermal Lens Study of Highly Absorbing Samples. P. Kumar, A. Khan, and D. Goswami, Chemical Physics 441, 5–10 (2014) [BibTeX]

     BibTeX: @article{kumarImportanceMolecularHeat2015,
      title = {Importance of Molecular Heat Convection in Time Resolved Thermal Lens Study of Highly Absorbing Samples},
      author = {Kumar, Pardeep and Khan, Arbaz and Goswami, Debabrata},
      year = {2014},
      month = sep,
      journal = {Chemical Physics},
      volume = {441},
      pages = {5--10},
      issn = {0301-0104},
      doi = {10/f6kr7q},
      urldate = {2019-08-01},
      annotation = {GSCC: 0000035 \\
      31 citations (Crossref) [2024-05-28]\\
      00000}
    }
    

16. Importance of Molecular Structure on the Thermophoresis of Binary Mixtures. P. Kumar and D. Goswami, The Journal of Physical Chemistry B 118(51), 14852–14859 (2014) [BibTeX]

     BibTeX: @article{kumarImportanceMolecularStructure2015,
      title = {Importance of {{Molecular Structure}} on the {{Thermophoresis}} of {{Binary Mixtures}}},
      author = {Kumar, Pardeep and Goswami, Debabrata},
      year = {2014},
      month = dec,
      journal = {The Journal of Physical Chemistry B},
      volume = {118},
      number = {51},
      pages = {14852--14859},
      issn = {1520-6106},
      doi = {10/gf5ms6},
      urldate = {2019-08-01},
      annotation = {GSCC: 0000015 \\
      6 citations (Crossref) [2024-05-28]\\
      00000}
    }
    

17. Thermal-Lens Spectroscopy in Binary Liquids Mixtures: Effect of Isotope Substitution. P. Kumar, I. Bhattacharyya, and D. Goswami, in Frontiers in Optics 2011/Laser Science XXVII (2011), Paper JTuA25 (Optical Society of America, 2011), p. JTuA25 [BibTeX]

     BibTeX: @inproceedings{kumarThermalLensSpectroscopyBinary2012,
      title = {Thermal-{{Lens Spectroscopy}} in {{Binary Liquids Mixtures}}: {{Effect}} of {{Isotope Substitution}}},
      shorttitle = {Thermal-{{Lens Spectroscopy}} in {{Binary Liquids Mixtures}}},
      booktitle = {Frontiers in {{Optics}} 2011/{{Laser Science XXVII}} (2011), Paper {{JTuA25}}},
      author = {Kumar, Pardeep and Bhattacharyya, Indrajit and Goswami, Debabrata},
      year = {2011},
      month = oct,
      pages = {JTuA25},
      publisher = {Optical Society of America},
      doi = {10/gf5nqg},
      urldate = {2019-08-02},
      copyright = {\&\#169; 2011 Optical Society of America},
      langid = {english},
      annotation = {GSCC: 0000001 \\
      0 citations (Crossref) [2024-05-28]\\
      00000}
    }
    

18. Unusual Behavior of Thermal Lens in Alcohols. P. Kumar, S. Dinda, A. Chakraborty, and D. Goswami, Physical Chemistry Chemical Physics 16(24), 12291–12298 (2014) [BibTeX]

     BibTeX: @article{kumarUnusualBehaviorThermal2015,
      title = {Unusual Behavior of Thermal Lens in Alcohols},
      author = {Kumar, Pardeep and Dinda, Sirshendu and Chakraborty, Atanu and Goswami, Debabrata},
      year = {2014},
      journal = {Physical Chemistry Chemical Physics},
      volume = {16},
      number = {24},
      pages = {12291--12298},
      doi = {10/gf5npt},
      urldate = {2019-08-02},
      langid = {english},
      annotation = {GSCC: 0000019 \\
      17 citations (Crossref) [2024-05-28]\\
      00000}
    }