Talbot cavity diode laser with uniform single-mode output

Details Talbot cavity diode laser with uniform single-mode output Talbot cavity diode laser with uniform single-mode output

1989-09-14

1990-11-20

Davie, James W.

Coherent light generators

Particular resonant cavity

372 50, 372 99, H01S 305

Patent

active

049724274

ABSTRACT:
A diode laser of the type having an array of laser emitters in a Talbot cavity in which edge reflectors are added to enhance feedback to edgemost emitters. In one embodiment, a transparent slab with reflectively coated sides is present between the phase plane of the emitted light and the Talbot cavity reflector. The phase plne is defined by a lenticular array placed a focal length in front of the laser emitters. In another embodiment, the Talbot cavity reflector has an increased reflectivity toward its edges. In all embodiments the Talbot cavity reflector is preferably spaced a distance na.sup.2 /.lambda. from the phase plane, where n is a positive integer, a is separation between adjacent emitters and .lambda. is the wavelength of emitted light. An integrated embodiment has the array and cavity reflectors defined ina single semiconductor body divided into active and ransparent region. Side mirrors are etched into the semiconductor body. The laser array may also be extended to two dimensions with individual lasers or laser bars fiber coupled to a lens surface, with an edge reflector and Talbot cavity reflector coated on an otherwise transparent slab.

REFERENCES:
patent: 4868839 (1989-09-01), Simmons et al.
James R. Leger, et al., "Coherent Addition of AlGaAs Lasers Using Microlenses and Diffractive Coupling", Applied Physics Letters 52 (21), 23 May 1988. pp. 1771-1773.
A. A. Golubentsev, et al., "Theory of Phase Locking of an Array of Lasers", Sov. Phys. JETP 66, (4), Oct. 1987, pp. 676-682.
John T. Winthrop, et al., "Theory of Fresnel Images. I. Plane Periodic Objects in Monochromatic Light", Journal of the Optical Society of America, vol. 55, No. 4, Apr. 1965, pp. 373-381.

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