Dynamic compensating laser telescope apparatus

Details Dynamic compensating laser telescope apparatus Dynamic compensating laser telescope apparatus

1992-11-20

1995-01-17

Ben, Loha

Optical: systems and elements

Lens

With support

359399, 359694, 359819, G02B 702, G02B 1514, G02B 2300

Patent

active

053830601

ABSTRACT:
A laser telescope is provided for reducing undesired laser thermal lensing effects which would otherwise impair the intensity and quality of a laser beam passing therethrough. An outer barrel is mounted in a chamber within a housing by ball bearings which hold the outer barrel longitudinally fixed but permits rotation of the outer barrel about its longitudinal axis. An inner barrel is coaxially situated within the outer barrel and includes a threaded outer surface which is threaded into a threaded inner surface of the outer barrel. A first lens is mounted adjacent one end of the chamber and a second lens is mounted in the inner barrel. A laser beam is directed through the laser telescope along the common axis of the chamber, the outer barrel, and the inner barrel. The lens spacing in the barrels is sensed and actuates a drive motor in proportion to the error between the sensed lens spacing and the desired lens spacing. The distance between the first and second lenses is varied in response to the error signals to adjust the focus of the laser beam to minimize thermal lensing effects.

REFERENCES:
patent: 4065207 (1977-12-01), Zavitsanos et al.
patent: 4083057 (1978-04-01), Quinn
patent: 4639083 (1987-01-01), Fuziwara et al.
patent: 4771437 (1988-09-01), Powell et al.
patent: 4885600 (1989-12-01), Iwasa et al.
patent: 4949358 (1990-08-01), Kantorski et al.
patent: 4972033 (1984-09-01), Fukuhara et al.
patent: 5001718 (1991-03-01), Burrows et al.

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