Article comprising a tunable semiconductor laser

Details Article comprising a tunable semiconductor laser Article comprising a tunable semiconductor laser

1993-03-01

1994-04-05

Bovernick, Rodney B.

Coherent light generators

Particular active media

Semiconductor

372 20, 372101, H01S 3107, H01S 3101, H01S 319

Patent

active

053012011

ABSTRACT:
The disclosed tunable (wavelength and/or focal length) laser typically is a surface emitting laser that comprises a multilayer structure that comprises the lower Bragg reflector and the active region. A layer of electro-optic material (typically liquid crystal material) is in contact with the top surface of the multilayer structure, and means are provided for applying a voltage across the layer of electro-optic material. In one exemplary embodiment, the layer is inside the laser cavity, making the laser wavelength tunable. In another exemplary embodiment the laser is a Z-laser that focuses the output radiation, with the multilayer structure comprising also the upper Bragg reflector. In this embodiment the layer of electro-optic material is outside the laser cavity, and the laser has tunable focal length. A still further embodiment is both wavelength- and focal length-tunable. Lasers according to the invention can be advantageously used in a variety of applications, e.g., in a wavelength division multiplexed and/or optically amplified optical fiber communication system.

REFERENCES:
"Monolithically Peltier-cooled vertical-cavity surface-emitting lasers", by Paul R. Berger et al., Applied Physics Lett., vol. 59(1), Jul. 1, 1991, pp. 117-119.
"Low Voltage Wavelength Tuning of an External Cavity Diode Laser Using a Nematic Liquid Crystal-Containing Birefringent Filter", by John R. Andrews, IEEE Photonics Technology Letters, vol. 2, No. 5, May 1990, pp. 334-336.
"Tunable Light Source Using a Liquid-Crystal Fabry-Perot Interferometer", by Hiroyuki Tsuda et al., IEEE Phonics Technology Letters, vol. 3, No. 6, Jun. 1991, pp. 504-506.
"Tunable wavelength conversion using a liquid crystal filter and a bistable laser diode", by Hiroyuki Tsuda et al., Applied Physics Letters, vol. 61 (17), Oct. 26, 1992, pp. 2006-2008.
"Electronically tuned diode-laser-pumped Cr:LiSrAlF sub 6 laser", by Qi Zhang, et al., Optics Letters, vol. 17(1), Jan. 1, 1992, pp. 43-45.

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