Patent ID: 7630125
Filing Date: 2009-12-08
Classification: H01S

Abstract:
1. A laser module, comprising: a light emitter, emitting a first beam; a polarizing and filtering unit, disposed on a transmission path of the first beam, wherein a part of the first beam passes through the polarizing and filtering unit to become a second beam with a specific polarization direction; a nonlinear optical crystal, disposed on a transmission path of the second beam from the polarizing and filtering unit, wherein the nonlinear optical crystal converts a part of the second beam into a third beam, and the wavelength of the third beam is smaller than the wavelength of the second beam; and a first filter, disposed on a transmission path of a non-converted part of the second beam not converted by the nonlinear optical crystal and the third beam from the nonlinear optical crystal, wherein the non-converted part of the second beam passing through the nonlinear optical crystal is reflected by the first filter, the third beam passes through the first filter, and a first bandwidth range of the transmission spectrum of the polarizing and filtering unit is narrower than and falls within a second bandwidth range of the reflection spectrum of the first filter.