Laser cavity having an adjustable optical path length extender

Details Laser cavity having an adjustable optical path length extender Laser cavity having an adjustable optical path length extender

1987-08-21

1990-11-06

Sikes, William L.

Coherent light generators

Particular resonant cavity

Folded cavity

372 92, 372 94, 372 99, 372101, H01S 3081

Patent

active

049691562

ABSTRACT:
A laser is disclosed which includes an optical path length extender for increasing the optical path length of the laser cavity. The path length extender, which is disposed inside the laser cavity itself, includes a set of three curved mirrors each having the same curvature. The three mirrors are spaced and angularly positioned such that light entering the path length extender is reflected back and forth about the three mirrors a defined number of times before exiting the path length extender. By rotating one or two of the mirrors the number of reflections within the set of mirrors can be changed. The laser cavity configuration is particularly useful in a pulse laser for increasing the optical path length of the cavity for the purpose of increasing the pulse to pulse separation of the emitted pulses, when such an increase is desired, but is not limited exclusively to pulse lasers.

REFERENCES:
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patent: 3575667 (1971-04-01), Smith
patent: 4400814 (1983-08-01), Fork et al.
patent: 4606031 (1986-08-01), Beene et al.
patent: 4617665 (1986-10-01), Mouron et al.
patent: 4740986 (1988-04-01), Reeder
patent: 4833683 (1989-05-01), Ury et al.
White; "Long Optical Paths of Large Aperture"; Journal of the Optical Society of America; May 1942; pp. 285-288.

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