Stimulated Raman scattering and four-wave mixing in CO/sub 2/-pumped para-H/sub 2/

Conference · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6126840

Carlsten, J L; Kurnit, N A

The Stokes source and CO/sub 2/ are combined with orthogonal polarization on a Ge beamsplitter and rendered oppositely circularly polarized by a KBr Fresnel rhomb, and then co-propagated through the amplifying medium contained in a 3m LN/sub 2/-cooled alumina waveguide. With this system, gain as high as e/sup 9/ on the peak of mode-locked spikes was observed, and with an HF OPO as input source, the system could be driven into pump depletion, but only for well-mode-locked pulses. Work with multipass refocusing cells is described both with a room temperature multipass cell (MPC) and also with a LN/sub 2/-cooled MPC. In addition to the gain measurements with the diode, we have obtained fully-depleted pump pulses with an OPO input, and have observed two-frequency depletion using two-pump pulses and one Stokes input, which is initiated by four-wave mixing. We have also obtained pump depletion starting from noise with a strong 9-..mu..m pump. The process involved is stimulated rotational Raman scattering in para-H/sub 2/. Scattering occurs from the J = 0 to the J = 2 rotational state which gives a Raman shift of 354.36 cm/sup -1/. By using para-H/sub 2/, from the blowoff of LH/sub 2/, one eliminates the odd rotational levels and thereby increase the gain for the J = 0 to J = 2 Raman transition. Results are presented and discussed. (WHK)

• Research Organization: Los Alamos Scientific Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6126840
• Report Number(s): LA-UR-81-2348; CONF-810844-1; ON: DE81028730
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFICATION
CARBON DIOXIDE LASERS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
GAIN
GAS LASERS
HYDROGEN
LASER CAVITIES
LASERS
MIXING
NONMETALS
OPTICAL PUMPING
POLARIZATION
PUMPING
RAMAN EFFECT
ROTATIONAL STATES
SPECTRAL SHIFT
VIBRATIONAL STATES
WAVEGUIDES