Stokes injected raman capillary waveguide amplifier
A device is described for producing stimulated Raman scattering of CO/sub 2/ laser radiation by rotational states in a diatomic molecular gas utilizing a stokes injection signal. The system utilizes a cryogenically cooled waveguide for extending focal interaction length. The waveguide, in conjunction with the stokes injection signal, reduces required power density of the CO/sub 2/ radiation below the breakdown threshold for the diatomic molecular gas. A fresnel rhomb is employed to circularly polarize the stokes injection signal and CO/sub 2/ laser radiation in opposite circular directions. The device can be employed either as a regenerative oscillator utilizing optical cavity mirrors or as a single pass amplifier. Additionally, a plurality of Raman gain cells can be staged to increase output power magnitude. Also, in the regenerative oscillator embodiment, the Raman gain cell cavity length and CO/sub 2/ cavity length can be matched to provide synchronism between mode locked CO/sub 2/ pulses and pulses produced within the Raman gain.
- Assignee:
- Dept. of Energy
- Patent Number(s):
- US 4222011
- OSTI ID:
- 6690631
- Country of Publication:
- United States
- Language:
- English
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