Single mode laser with a passive antiguide region

Details Single mode laser with a passive antiguide region Single mode laser with a passive antiguide region

1994-10-04

1996-07-23

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Mode discrimination

372 98, 372 92, 372 64, 372102, H01S 3098

Patent

active

055397590

ABSTRACT:
A single mode laser with a laser cavity consisting of an active medium and a first and second reflectors with an antiguide region or layer having a high refractive index positioned adjacent to the laser cavity to bleed off higher order lasing modes and preventing them from attaining the lasing condition. Specifically, light belonging to higher order modes leaks or bleeds into the antiguide region from the laser medium and from the first and second reflectors. When spacers for selecting the desired wavelength of laser light are provided, the light travelling through them leaks into the antiguide layer as well.
Optimization of the bleeding of higher order modes into the passive antiguide region can be achieved by adjusting a taper angle of the laser cavity. Furthermore, by adjusting the ratio of the equivalent refractive index of the laser cavity and the passive antiguide region single mode operation at high current levels can be realized for apertures as large as 30 .mu.m. In addition, such lasers exhibit a repeatable and predetermined direction of polarization, most commonly along the [011] crystal orientation of the laser medium.

REFERENCES:
patent: 5272711 (1993-12-01), Mawst et al.
patent: 5276700 (1994-01-01), Jansen et al.
patent: 5349602 (1994-09-01), Mehuys et al.

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