US 6,788,717 B2 · Wavelength stabilized laser module

Abstract

A wavelength stabilized laser module is provided which is so configured as to be simplified and smaller in size and is capable of emitting semiconductor laser light whose wavelength is stablized with high accuracy. The wavelength stablized laser module includes a semiconductor laser, a substrate, a lens to convert emitted semiconductor laser light to parallel luminous flux, a first photoelectric converter to receive a part of the parallel luminous flux and to convert it to electric signals, a filter to receive a part of the parallel luminous flux, a second photoelectric converter to receive light transmitted through the filter and to convert it to electric signals, wherein a control signal to be used for stabilization obtained by computations of electric signals fed from the converters is fed back to the semiconductor laser device and/or the substrate so that said semiconductor laser is able to stably emit laser light having a reference wavelength to be used as a target for stabilization.

Claims20

Dependent claims

A wavelength stabilized laser module, comprising:

a semiconductor laser;
a temperature calibrating unit to calibrate a temperature of said semiconductor laser;
only one lens to arrange light emitted from said semiconductor laser so as to be a single parallel luminous flux;
a first photoelectric converting unit to receive one part of said parallel luminous flux and to convert it to a first electric signal;
a filter to receive another part of said parallel luminous flux and to continuously change its transmittance depending on wavelengths of said light;
a second photoelectric converting unit to receive light transmitted through said filter and to convert it to a second electric signal;
wherein a control signal, to be used for stabilization of wavelengths, obtained by computations of said first electric signal and said second electric signal fed from said first photoelectric converting unit and said second photoelectric converting unit, is fed back to said semiconductor laser and/or said temperature calibrating unit so that said semiconductor laser is able to stably emit laser light having a reference wavelength to be used as a target for stabilization of wavelengths.

4 more elements

Dependencies are inferred from the claim text.

Wavelength stabilized laser module

Life of this patent

Wavelength stabilized laser module

Life of this patent

Abstract

Claims20