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Title: Effects of self-phase modulation (SPM) on femtosecond coherent anti-Stokes Raman scattering spectroscopy

Abstract

The effects of self-phase modulation (SPM) on the power spectra of femtosecond (fs) pulses and the consequent impact on N2 chirped-probe-pulse (CPP) fs coherent anti-Stokes Raman scattering (CARS) spectra are discussed in this paper. We investigated the pressure dependence of CPP fs CARS for N2 in a room-temperature gas cell at pressures ranging from 1 to 10 bar, and in our initial experiments the CPP fs CARS spectrum changed drastically as the pressure increased. We found that the spectra of the near-Fourier-transform-limited, 60-fs pump and Stokes pulses at the exit of the gas cell changed drastically as the pressure increased due to self-phase-modulation (SPM). This effect was examined in detail in further experiments where the pulse energies of the pump and Stokes pulses were controlled using a combination of a half-wave plate and a linear polarizer. Along with the generated CARS spectrum, the spectra of pump and Stokes pulses were measured at the entrance and exit of the gas cell. The extent of SPM effects for a particular spectrum was characterized by the least squares difference between that spectrum and a spectrum recorded at low enough pressure and laser intensities that SPM was negligible. SPM effects were investigated for N2,more » O2, CO2, and CH4, for pressures ranging from 1 to 10 bar, and for pump and Stokes pulse energies ranging from 10 to 60 μJ. We found that SPM effects in N2 were much weaker than for O2, CO2 and CH4.« less

Authors:
; ;
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
OSTI Identifier:
1573297
Alternate Identifier(s):
OSTI ID: 1594855
Grant/Contract Number:  
FG02-03ER15391
Resource Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Name: Optics Express Journal Volume: 27 Journal Issue: 23; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Gu, Mingming, Satija, Aman, and Lucht, Robert P. Effects of self-phase modulation (SPM) on femtosecond coherent anti-Stokes Raman scattering spectroscopy. United States: N. p., 2019. Web. doi:10.1364/OE.27.033954.
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Gu, Mingming, Satija, Aman, & Lucht, Robert P. Effects of self-phase modulation (SPM) on femtosecond coherent anti-Stokes Raman scattering spectroscopy. United States. https://doi.org/10.1364/OE.27.033954
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Gu, Mingming, Satija, Aman, and Lucht, Robert P. Wed . "Effects of self-phase modulation (SPM) on femtosecond coherent anti-Stokes Raman scattering spectroscopy". United States. https://doi.org/10.1364/OE.27.033954.
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@article{osti_1573297,
title = {Effects of self-phase modulation (SPM) on femtosecond coherent anti-Stokes Raman scattering spectroscopy},
author = {Gu, Mingming and Satija, Aman and Lucht, Robert P.},
abstractNote = {The effects of self-phase modulation (SPM) on the power spectra of femtosecond (fs) pulses and the consequent impact on N2 chirped-probe-pulse (CPP) fs coherent anti-Stokes Raman scattering (CARS) spectra are discussed in this paper. We investigated the pressure dependence of CPP fs CARS for N2 in a room-temperature gas cell at pressures ranging from 1 to 10 bar, and in our initial experiments the CPP fs CARS spectrum changed drastically as the pressure increased. We found that the spectra of the near-Fourier-transform-limited, 60-fs pump and Stokes pulses at the exit of the gas cell changed drastically as the pressure increased due to self-phase-modulation (SPM). This effect was examined in detail in further experiments where the pulse energies of the pump and Stokes pulses were controlled using a combination of a half-wave plate and a linear polarizer. Along with the generated CARS spectrum, the spectra of pump and Stokes pulses were measured at the entrance and exit of the gas cell. The extent of SPM effects for a particular spectrum was characterized by the least squares difference between that spectrum and a spectrum recorded at low enough pressure and laser intensities that SPM was negligible. SPM effects were investigated for N2, O2, CO2, and CH4, for pressures ranging from 1 to 10 bar, and for pump and Stokes pulse energies ranging from 10 to 60 μJ. We found that SPM effects in N2 were much weaker than for O2, CO2 and CH4.},
doi = {10.1364/OE.27.033954},
journal = {Optics Express},
number = 23,
volume = 27,
place = {United States},
year = {Wed Nov 06 00:00:00 EST 2019},
month = {Wed Nov 06 00:00:00 EST 2019}
}
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