Selfcollimated unstable resonator semiconductor laser
Abstract
Selfcollimation of the output is achieved in an unstable resonator semiconductor laser by providing a large concave mirror (M sub 1) and a small convex mirror (M sub 2) on opposite surfaces of a semiconductor body of a material having an effective index of refraction denoted by n, where the respective mirror radii (R sub 1, R sub 2) and beam radii (r sub 1, r sub 2) are chosen to satisfy a condition (R sub 2)/(1+r sub 1) = (n1)/n, with a value of geometric magnification 1 less than or equal to M less than or equal to (n+1)/(n1) where r (sub 1) and r (sub 2) are the radii of counterpropagating beams at respective mirrors of radii R (sub 1) and R (sub 2).
 Publication:

National Aeronautics and Space Administration Report
 Pub Date:
 August 1991
 Bibcode:
 1991nasa.reptQT...L
 Keywords:

 Collimation;
 Convexity;
 Mirrors;
 Refractivity;
 Resonators;
 Semiconductor Lasers;
 Semiconductors (Materials);
 Magnification;
 Patent Applications;
 Radii;
 Lasers and Masers