Title :
Raman shifting in the absence of multiple Stokes orders with a Nd:YAG laser in hydrogen: evidence of coupling between the forward and backward Stokes processes
Author :
Watson, Jason P. ; Miller, Harold C.
Author_Institution :
Optical Sci. Center, Arizona Univ., Tucson, AZ, USA
fDate :
8/1/1997 12:00:00 AM
Abstract :
By Raman shifting the output of a 1.319-μm Nd:YAG laser in hydrogen, up to 24.5 mJ of Stokes light at 2.918 μm has been generated. Due to the low energy of the 2.918-μm Stokes photons, the first Stokes is the only Stokes line for this system. The effect of pressure on the conversion is notably simpler in this regime, but the gain saturates unusually slowly. An unexpected pump linewidth sensitivity in the forward Stokes conversion is observed. Coupling of the forward and backward Stokes processes is suggested as an explanation for these effects and is supported by a simple model
Keywords :
Raman spectra; hydrogen; laser transitions; neodymium; optical couplers; optical pumping; optical saturation; photons; sensitivity; solid lasers; 1.319 mum; 2.918 mum; 24.5 mJ; Nd:YAG laser; Raman shifting; Stokes line; Stokes photons; YAG:Nd; YAl5O12:Nd; backward Stokes processes; forward Stokes conversion; forward Stokes processes; gain saturation; hydrogen; low energy; multiple Stokes orders; unexpected pump linewidth sensitivity; Gas lasers; Hydrogen; Laser excitation; Laser modes; Laser theory; Laser transitions; Lenses; Optical resonators; Pump lasers; Structural beams;
Journal_Title :
Quantum Electronics, IEEE Journal of
