Alignment method and arrangement for external optical feedback f

Details Alignment method and arrangement for external optical feedback f Alignment method and arrangement for external optical feedback f

1987-08-21

1989-01-10

Sikes, William L.

Coherent light generators

Particular resonant cavity

372 33, 372 99, H01S 308

Patent

active

047978945

ABSTRACT:
A semiconductor diode laser has at least one output beam emitted from an emission aperture from a facet of the laser. An external optical feedback resonator redirects the output beam back into the laser emission aperture. The resonator comprises a reflective surface mirror on the facet laterally adjacent to the laser emission aperture and a spherical mirror spatial positioned from the laser facet to receive the output beam and image the same onto the facet mirror and, then, reimage the beam reflected from the facet mirror back into the laser emission aperture. The improvement comprises the spherical mirror being spaced from the center of the facet a distance substantially equal to the radius of curvature of the mirror so that the reimaging of the beam provides a spot size substantially equal to the spot size of the emission aperture or the beam waist, W.sub.0, at the laser facet. The alignment of the spherical mirror relative to the laser facet in directions laterally of and rotationally about the radius of curvature of the spherical mirror is insensitive to limited relative movement between the spherical mirror and the laser in those directions.

REFERENCES:
patent: 4594719 (1986-06-01), Ackley
patent: 4656641 (1987-04-01), Scifres et al.
patent: 4719630 (1988-01-01), Streifer
Renner et al., "Simple System for Broad-Band Single Mode Tuning of D.H. GaAlAs Lasers", Electronics Letters, Feb. 1, 1979, vol. 15, No. 3, pp. 73-74.
E. M. Belenov et al, "Methods for Narrowing the Emission Line of an Injection Laser", Soviet Journal of Quantum Electronics, vol. 13(6), pp. 792-798, Jun., 1983.

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