The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 13, 1996
Filed:
Feb. 15, 1995
Atsushi Kitamura, Tokyo, JP;
Ando Electric Co., Ltd., Tokyo, JP;
Abstract
The purpose of the present invention is to provide a wavelength-variable semiconductor laser light source in which the oscillation wavelength of the semiconductor laser can be set up at higher resolution under phase-continuous conditions. In the present invention, semiconductor laser 1 outputs outgoing light from the end face with an antireflection film. The output light is split into transmitted light and reflected light by a beam splitter which is fixed on a parallel sliding stage. The transmitted light is incident on a diffraction grating fixed on a moving stage which is provided on the parallel sliding stage. The parallel sliding stage moves in parallel with the optical axis of semiconductor laser. A PSD is provided for inputting the expanded light and outputting an electric signal which is proportional to an amount of the displacement of the expanded light. A wavelength setting part arbitrarily sets the oscillation wavelength of the semiconductor laser, and a comparator compares a set signal From the wavelength setting part with the electric signal from the PSD and feeds the result back to the parallel sliding driver which drives the parallel sliding stage.