Rugate filter on grating coupled surface emitting laser array

Details Rugate filter on grating coupled surface emitting laser array Rugate filter on grating coupled surface emitting laser array

1990-09-10

1992-04-28

Davie, James W.

Coherent light generators

Particular beam control device

Optical output stabilization

372 49, 372 50, 372 96, H01S 310

Patent

active

051093863

ABSTRACT:
A glass film is deposited over the second order grating of a grating coupled surface emitting laser. The glass film has a continuously varying refractive index with thickness, usually in the form of or similar to a sine wave. The rugate filter is assembled to overlie the second order grating of the laser so that a peak wavelength .lambda..sub.p is reflected back into the second order grating which couples the light into the laser. Be reflecting light at the peak wavelength back into the laser, the laser is caused to emit at the desired wavelength. Since the rugate filter selectively reflects light within a narrow band of the desired wavelength, the laser emits light within the same narrow band. The use of a surface emitting laser facilitates summing of the output light of several adjacent lasers within a monolithic array to provide high power output.

REFERENCES:
patent: 4872176 (1989-10-01), Hammer
patent: 4894833 (1990-01-01), Carlin
patent: 4951292 (1990-08-01), Kuindersma et al.
patent: 4952019 (1990-08-01), Evans et al.
Zh. I. Alferov, et al., "Monolithically Integrated Hybrid Heterostructure Diode Laser with Dielectric-Film Waveguide DBR", IEEE J. of Quant. Elec., vol QE-23, No. 6, Jun. 1987, pp. 869-881.
S. A. Gurevich, "Testing of a Bragg Heterojunction Injection Laser with a Thermally Stable Output Wavelength", Sov. Tech. Phys. Lett., 11(5), May 1985, pp. 218-220.

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