Resonant nonlinear refraction of 4–5-μm light in CO and CO2 gas

Pigeon, J. J.; Tovey, D.; Tochitsky, S. Ya.; Louwrens, G. J.; Ben-Zvi, I.; Martyshkin, D.; Fedorov, V.; Karki, K.; Mirov, S.; Joshi, C.

doi:10.1103/physreva.104.043519

Resonant nonlinear refraction of $4 – 5 - μ m$ light in CO and $C O_{2}$ gas

Journal Article · Thu Oct 21 00:00:00 EDT 2021 · Physical Review A

DOI:https://doi.org/10.1103/physreva.104.043519· OSTI ID:1979603

Pigeon, J. J. ^[1]; Tovey, D. ^[2]; Tochitsky, S. Ya. ^[2]; Louwrens, G. J. ^[2]; ^[3]; ^[4]; Fedorov, V. ^[4]; Karki, K. ^[4]; Mirov, S. ^[4]; Joshi, C. ^[2]

Stony Brook Univ., NY (United States); OSTI
Univ. of California, Los Angeles, CA (United States)
Stony Brook Univ., NY (United States)
Univ. of Alabama, Birmingham, AL (United States)

The resonant nonlinear refraction of 4–5-μm light in CO and CO₂ gas at a peak intensity of 15MW/cm² was demonstrated using time- and frequency-resolved measurements of self-focusing and self-defocusing. The nonlinearity of these molecular gases exhibits intensity-dependent sign reversals and a <4-ns response time. A change from self-focusing to self-defocusing or vice versa was observed to occur for Rabi frequencies that are comparable to the collisional linewidth. A density matrix model for the nonlinear susceptibility of a strongly driven two-level system provides a qualitative explanation for these results.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Alabama, Birmingham, AL (United States)

Sponsoring Organization:: US Office of Naval Research (ONR); USDOE Office of Science (SC)

Grant/Contract Number:: SC0018378

OSTI ID:: 1979603

Journal Information:: Physical Review A, Journal Name: Physical Review A Journal Issue: 4 Vol. 104; ISSN PLRAAN; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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