Control method of distributed Bragg reflection semiconductor...

Details Control method of distributed Bragg reflection semiconductor... Control method of distributed Bragg reflection semiconductor...

2009-01-30

2010-10-05

Rodriguez, Armando (Department: 2828)

Coherent light generators

Particular beam control device

Having particular beam control circuit component

C372S050110

Reexamination Certificate

active

07809032

ABSTRACT:
A DBR semiconductor laser is controlled in an image projecting apparatus, which includes the DBR laser having a phase and DBR region, a light wavelength converting device for converting fundamental-wave light emitted from the DBR laser into second harmonic wave light, an optical deflector for scanning the second harmonic wave in a one or two-dimensional manner, and a modulating portion for modulating the DBR laser. Coefficient calculating and wavelength adjusting steps are performed within a non-drawing time. The coefficient calculating step calculates at least one coefficient in a relationship between a DBR current to be injected into the DBR region and a phase current to be injected into the phase region for continuously shifting the wavelength of the fundamental-wave light. The wavelength adjusting step changes DBR current injected into the DBR region and phase current injected into the phase region based on the relationship.

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