Laser alignment servo method and apparatus

Details Laser alignment servo method and apparatus Laser alignment servo method and apparatus

1990-06-11

1991-07-16

Scott, Jr., Leon

Coherent light generators

Particular resonant cavity

Mirror support or alignment structure

372 98, 372 38, 372 33, H01S 308

Patent

active

050330616

ABSTRACT:
A servo alignment method and apparatus for maintaining laser beam alignment. An operating parameter of the laser (such as output beam power) is measured, and error signals are generated from the measured operating parameter signal for controlling the laser beam alignment. In one class of embodiments, modulation signals are supplied to an intra-cavity component of a laser system to modulate the beam path. The beam path may be modulated by reciprocating a laser resonator mirror about a mirror axis or two substantially orthogonal mirror axes. In the latter case, the mirror may be vibrated about the axes either alternately (first about one axis and then about the other) or simultaneously. In embodiments in which an intra-cavity component is modulated, the laser operating parameter is measured during such modulation, the measured operating parameter signal is demodulated (preferably by multiplication in a mixer with a selected frequency component of the modulation signal currently being asserted, and error signals are generated from the demodulated signal for controlling the laser beam alignment.

REFERENCES:
patent: 4853935 (1989-08-01), Laine et al.
patent: 4905243 (1990-02-01), Lokai et al.
patent: 4939739 (1990-07-01), Hobart et al.

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