Coherent light generators – Particular beam control device – Producing plural wavelength output
Patent
1990-04-10
1992-02-25
Sikes, William L.
Coherent light generators
Particular beam control device
Producing plural wavelength output
372105, 372 99, 372 20, H01S 3106
Patent
active
050919130
ABSTRACT:
A birefringent quartz plate is inserted in the laser cavity to generate two orthogonal polarized beams with different frequencies, and with the amount of frequency difference depending upon the angle of orientation of the crystalline axis of the quartz plate with respect to the longitudinal axis of the laser beam in the cavity. Frequency differences between the generated dual frequency beams can be varied from tens of MHz to more than 1000 MHz, with tuning or variation being effected by a mechanism for rotating the quartz plate. This apparatus provides a dual-frequency laser for interferometry, laser Doppler velocimeters and other applications.
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Jin Kuofam
Wu Minxian
Yang Sen
Zhang Shulian
Morse Susan S.
Sikes William L.
Tsinghua Unversity
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