Phased array semiconductor lasers with uniform and stable superm

Details Phased array semiconductor lasers with uniform and stable superm Phased array semiconductor lasers with uniform and stable superm

1986-03-24

1988-01-12

LaRoche, Eugene R.

Coherent light generators

Particular beam control device

Mode locking

372 45, 372 46, 372 50, H01S 3098

Patent

active

047196300

ABSTRACT:
A phased array semiconductor laser favoring emission in the 1st or Nth supermode over other potential supermodes of the laser comprising a plurality of spatially disposed laser elements formed relative to an active region to provide optical cavities for light wave generation and propagation under lasing conditions and wherein the optical field of laser elements are coupled into the optical cavities of adjacent laser elements to provide a phase locked condition across the array. The position of the outer laser element at each end of the array are spaced closer to adjacent laser element compared to the spacing provided between all the other of laser elements such that the coupling across the array is enhanced to produce at least one supermode with a nearly uniform and fairly rectangular shaped intensity envelope. The optimized optical coupling coefficient between the outer lasing elements and their adjacent laser elements is .sqroot.2 K, where K is the optical coupling coefficient between the other laser elements. The optical coupling coefficient of .sqroot.2 K between these outer lasing elements, however, may be within the range of 80% to 120% of .sqroot.2 K. The phase of some of the laser elements in the array may be reversed 180.degree..

REFERENCES:
patent: Re31806 (1985-01-01), Scifres et al.
patent: 4594719 (1986-06-01), Ackley
patent: 4624000 (1986-11-01), Streifer et al.
W. Streifer et al., "Phase Array Diode Lasers", Laser Focus/Electro-Optics, Jun. 1984, (4 pages).

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