Alignment-insensitive method for wideband tuning of an unmodifie

Details Alignment-insensitive method for wideband tuning of an unmodifie Alignment-insensitive method for wideband tuning of an unmodifie

1989-08-30

1991-12-31

Davie, James W.

Coherent light generators

Particular beam control device

Tuning

H01S 310

Patent

active

050777475

ABSTRACT:
Using simple optical components and an unmodified commercial off-the-shelf semiconductor laser, a frequency-selective self-aligning optical-feedback technique has been devised that allows a semiconductor laser to be tuned to and scanned about any optical frequency within the laser gain curve. This technique employs a graded-index rod lens cat's eye and an intracavity etalon for selecting one laser side mode. By changing the external cavity length, the laser frequency can be continuously tuned within one external cavity free spectral range. To further extend the tuning range, the laser injection current is changed to produce a discontinuous hop in the laser frequency. To eliminate the hops the cavity length and laser current are changed simultaneously.

REFERENCES:
B. E. Bernacki et al., "Alignment-Insensitive Technique for Wideband Tuning of an Unmodified Semiconductor Laser", Optics Letters, vol. 13, No. 9, Sep. 1988, pp. 725-727.
C. L. Tang et al., "Wide-Band Electro-Optical Tuning of Semiconductor Lasers", Applied Physics Letters, vol. 30, No. 2, Jan. 15, 1977, pp. 113-116.
N. Lee et al., "Single Longitudinal Mode TEA CO.sub.2 Laser With Tilted in Tracavity Etalon", Applied Optics, vol. 16, No. 10, Oct. 1977, pp. 2620-2621.

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