Coherent light generators – Particular active media – Semiconductor
Patent
1996-09-05
1998-08-04
Bovernick, Rodney B.
Coherent light generators
Particular active media
Semiconductor
372 96, 372 50, H01S 310
Patent
active
057905797
ABSTRACT:
A pulsed semiconductor laser has a lower threshold current and a more stable pulse train. The structure includes a saturable absorber section has a quantum well structure for laser oscillation, a gain section, a phase control section, and a super structure grating-distributed Bragg reflector section. It uses an improved construction for overcoming problems of conventional pulsed semiconductor lasers. The improved structure includes five quantum well layers having thicknesses with respective spontaneous emission peak wavelengths of ".lambda.-2.delta.", ".lambda.+.delta.", ".lambda.+2.delta.", ".lambda.", ".lambda.-.delta." at room temperature from their upper section. .lambda. denotes the mean wavelength of the oscillating pulse laser, and .delta. denotes a fixed value less than 12 nm. The super structure grating-distributed Bragg reflector section has five sampling sections, with each section having five kinds of different pitches arranged in order of thicknesses of 25 cycles, 5 cycles, 25 cycles, 5 cycles, and 25 cycles.
REFERENCES:
patent: 5497393 (1996-03-01), Lee
patent: 5581572 (1996-12-01), Delorme et al.
patent: 5636236 (1997-06-01), Tada et al.
patent: 5640409 (1997-06-01), Ito et al.
patent: 5659562 (1997-08-01), Hisa
Ahn Joon-Tae
Lee El-Hang
Lee Kyu-Seok
Bovernick Rodney B.
Electronics and Telecommunications Research Institute
Song Yisun
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