US 2001/0026568 A1Published application

Light source for an external cavity laser

AssigneeAndo Electric Co., Ltd.

InventorKeisuke Asami

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Abstract

A light source for an external cavity laser comprises a semiconductor laser 1 having a first facet to which is applied an antireflection coating 1A and a second facet to which is applied a increased reflection coating 1B defining a predetermined reflectivity, lenses 5, 6, a diffraction grating 2, and a mirror 3, wherein a light emitted from the first facet is converted into a parallel light by the lens 5, and the parallel light passes through the diffraction grating 2 to select a wavelength and is reflected to the diffraction grating 2 by the mirror 3 to select a wavelength via the diffraction grating 2 again, and the parallel light is converged by the lens 5 to be fed back to the semiconductor laser 1, and a light emitted from the second facets is converged by the lens 7 to be output to an optical fiber 4.

Claims7

Dependent claims

A light source for an external cavity laser comprising:

a semiconductor laser including a first facet with an antireflection coating, and a second facet with an increased reflection coating defining a predetermined reflectivity, the semiconductor laser for emitting two light beams from the first facet and the second facet;
a first mirror for converting the light beam emitted from the first facet into a parallel light beam;
a second mirror for converting the light beam emitted from the second facet into a parallel light beam;
a wavelength selection optical element for selecting a wavelength of the parallel light beam and emitting the parallel light beam having the wavelength selected;
and
a mirror reflecting back the parallel light beam emitted from the wavelength selection optical element so that the wavelength of the parallel light beam is selected twice in the wavelength selection optical element;
wherein the parallel light beam selected twice is converged by the first lens to be fed back to the semiconductor laser;
and
the light beam emitted from the second facet is converged by the second lens to be output to a first optical fiber.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/817,927Filed 27 Mar 2001
Priority: JP P.2000-9421230 Mar 2000
Published: 4 Oct 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

H01S 5/141
External cavity lasers: using a wavelength selective device, e.g. a grating or etalon
H01S 5/143
Using a wavelength selective device, e.g. a grating or etalon: littman-Metcalf configuration, e.g. laser - grating - mirror
H01S
Devices using the process of light amplification by stimulated emission of radiation

Family

US 6,700,904 B2Related patent
US 2001/0026568 A1This patent

From the US filing history. Foreign family members aren’t listed.

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