Coherent light generators – Raman laser
Patent
1992-07-17
1993-11-02
Bovernick, Rodney B.
Coherent light generators
Raman laser
H01S 330
Patent
active
052589889
ABSTRACT:
The present invention provides a Raman laser wherein hazardous radiation from a pump laser source 20 is focused by lens 25 via a cell 27 containing a Raman active medium before passing to a absorbing beam dump 30. Lasing action is maintained within the cell 27 by the action of mirrors 29 and 26 which are respectively totally and partially reflective to radiation generated at the Raman wavelength, and which are both transmissive to the pump beam. A Raman beam exits the cell via partially transmissive mirror 26 is refocused by lens 25 and passes through to the output of the device 31. This configuration provides a Raman laser where the "eyesafe" Raman beam is generated in a backwards direction relative to the pump beam, so that during normal operation, or in the event that the optics breakdown, or conversion does not take place within the cell, the output beam would not be contaminated by potentially harmful wavelengths at a hazardous level.
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"Raman laser utilizing rotational levels of hydrogen with a ring resonator" Soviet Journal of Quantum Elec. 18 (10) Oct. 1988 pp. 1280-1282.
"A Self-Seeded SRS System for the Generation of 1.54 um Eye-Safe Radiation" Optics Communications 75, No. 2 Feb. 15, 1990, pp. 173-178.
Bovernick Rodney B.
GEC Ferranti Defence Systems Limited
Wise Robert E.
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