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10 May 1996 Raman shifting in hydrogen with a Cr:LiSAF pump
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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);


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