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Proceedings Paper

Raman shifting in hydrogen with a Cr:LiSAF pump
Author(s): Mark D. Eickhoff; David C. MacPherson
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Paper 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.

Paper Details

Date Published: 10 May 1996
PDF: 7 pages
Proc. SPIE 2700, Nonlinear Frequency Generation and Conversion, (10 May 1996); doi: 10.1117/12.239684
Show Author Affiliations
Mark D. Eickhoff, Ophir Corp. (United States)
David C. MacPherson, Ophir Corp. (United States)

Published in SPIE Proceedings Vol. 2700:
Nonlinear Frequency Generation and Conversion
Mool C. Gupta; William J. Kozlovsky; David C. MacPherson, Editor(s)

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