Resonant-periodic-gain distributed-feedback surface-emitting sem

Details Resonant-periodic-gain distributed-feedback surface-emitting sem Resonant-periodic-gain distributed-feedback surface-emitting sem

1990-05-18

1991-09-24

Davie, James W.

Coherent light generators

Particular resonant cavity

Distributed feedback

372 45, 372 47, 372 50, 372 92, H01S 319

Patent

active

050520164

ABSTRACT:
A resonant-periodic-gain distributed-feedback surface-emitting semiconductor laser has a resonator with an axis perpendicular to the plane of the substrate. The resonator comprises a stack of distributed feedback elements, each consisting of a spacer region and a very thin gain element positioned at an antinode of a standing wave inside the resonator at a designed wavelength. Each gain element consists of one or a group of closely spaced quantum-well layers. Each spacer, separating two adjacent gain elements, consists of two intermediate-and low-refractive-index layers, each layer of the spacer having an optical thickness approximately equal to a quarter of the designed wavelength. The refractive index of each of the gain elements is higher than that of the spacer materials. The device can be surrounded by a material of refractive index lower than all materials comprising the device for better confinement of carriers and control of guided modes of radiation. The structure can be directly pumped either optically or with an electron beam. Also, various well known schemes for electrical pumping can be utilized. The devices can be arranged to form one- or two-dimensional arrays.

REFERENCES:
patent: 4675876 (1987-06-01), Svilans
patent: 4881236 (1989-11-01), Brueck et al.
Geels, R. S. et al., "Low Threshold Planarized Vertical-Cavity Surface-Emitting Lasers", IEEE Photonics Technology Letters, vol. 2, No. 4, Apr. 1990, pp. 234-236.
Jewell, J. L., et al., "Vertical Cavity Single Quantum Well Laser", Postdeadline Papers CLEO 1989 Conference on Lasers and Electro-Optics, Baltimore, MD. Apr. 24-28, 1989, pp. PD14-1-PD14-2.
Ogura, M., et al., "Surface Emitting Laser Diode with Al.sub.x Ga.sub.l-x As/GaAs Multilayered Heterostructure", J. Vac. Sci. Tech. B 3(2), pp. 784-787, Mar./Apr. 1985.
Nomura, Y., et al., "GaAs/AlGaAs Distributed Feedback Structure with Multiquantum Well for Surface-Emitting Laser", J. Appl. Phys. 60(3), pp. 874-877, Aug. 1986.

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