Raman shifting in hydrogen with a Cr:LiSAF pump

Mark D. Eickhoff; David C. MacPherson

doi:10.1117/12.239684

10 May 1996 Raman shifting in hydrogen with a Cr:LiSAF pump

Mark D. Eickhoff, David C. MacPherson

Proceedings Volume 2700, Nonlinear Frequency Generation and Conversion; (1996) https://doi.org/10.1117/12.239684
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

Double Raman shifting in molecular hydrogen is used in our laboratory as a method to generate tunable infrared radiation. The pump pulses from a Q-switched Cr:LiSAF laser at 885 nm are typically 50 mJ with a pulse width (FWHM) of about 120 ns. the spectral width of the pulses is narrowed to < 1 GHz by injection seeding using a stable, tunable AlGaAs diode laser coupled through a single-mode fiber. A Cr:LiSAF amplifier increases the pulse energy by a factor of two and these amplified pulses are focused (Rayleigh range approximately equals 7 cm) into a cell filled with 12 atm of hydrogen. A resonator which is high-Q at the first Stokes wavelength (1.40 micrometers ) improves the efficiency of the conversion process. Further enhancement of the desired second Stokes radiation is expected by phase-matching with a small admixture of carbon dioxide. 2.5 mJ of 3.33 micrometers radiation has been observed from this system without phase-matching. The tunability of the pump laser will allow the second Stokes output to span the 2 - 5 micrometers wavelength range.

Citation Download Citation

Mark D. Eickhoff and David C. MacPherson "Raman shifting in hydrogen with a Cr:LiSAF pump", Proc. SPIE 2700, Nonlinear Frequency Generation and Conversion, (10 May 1996); https://doi.org/10.1117/12.239684

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