Reduction of parasitic lasing

Details Reduction of parasitic lasing Reduction of parasitic lasing

1993-08-11

1994-11-29

Bovernick, Rodney B.

Coherent light generators

Particular resonant cavity

Specified cavity component

372 12, 372 25, H01S 310, H01S 311

Patent

active

053696620

ABSTRACT:
A technique has been developed which carefully retro-reflects precisely controlled amounts of light back into a laser system thereby intentionally forcing the laser system components to oscillate in a new resonator called the parasitic oscillator. The parasitic oscillator uses the laser system to provide the gain and an external mirror is used to provide the output coupling of the new resonator. Any change of gain or loss inside the new resonator will directly change the lasing threshold of the parasitic oscillator. This change in threshold can be experimentally measured as a change in the absolute value of reflectivity, provided by the external mirror, necessary to achieve lasing in the parasitic oscillator. Discrepancies between experimental data and a parasitic oscillator model are direct evidence of optical misalignment or component performance problems. Any changes in the optical system can instantly be measured as a change in threshold for the parasitic oscillator. This technique also enables aligning the system for maximum parasitic suppression with the system fully operational.

REFERENCES:
patent: 5018152 (1991-05-01), Linne et al.

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