Coherent light generators – Particular beam control device – Tuning
Patent
1988-07-07
1989-07-25
Davie, James W.
Coherent light generators
Particular beam control device
Tuning
372 32, 372 50, 372 96, 372704, H01S 310, H01S 319
Patent
active
048521086
ABSTRACT:
A semiconductor laser is disclosed in which a light emitting region having a light emitting layer and a waveguide region having a waveguide layer which is coupled to at least one side of the light emitting layer with a high efficiency are integrated on the same substrate; the light emitting region includes an active filter section having a diffraction grating equipped with a band-pass filter function; the light emitting region and the waveguide region are electrically isolated and are each provided with an electrode; and the oscillation wavelength of the semiconductor lase is changed by changing the refractive indices of at least the waveguide region and the active filter section through voltage application or current injection to the electrodes, thereby producing a narrow-linewidth, single-wavelength oscillation output light of a wavelength which corresponds to the transmission wavelength of the active filter section determined by the preset refractive indices of the waveguide region and the active filter section.
REFERENCES:
patent: 4719636 (1988-01-01), Yamaguchi
Matsushima Yuichi
Sakai Kazuo
Utaka Katsuyuki
Burns Robert E.
Davie James W.
Kokusai Denshin Denwa Kabushiki Kaisha
Lobato Emmanuel J.
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