Patent ID: 7706425
Filing Date: 2010-04-27
Classification: B82Y,H01S

Abstract:
1. A Littrow-type external-cavity diode laser optical axis displacement correction method, comprising: inputting laser light from a laser source into a diffraction grating and a prism integrally fixed by a jig such that the laser light is reflected by the diffraction grating and zero-order diffraction light enters the prism through a first surface (a) of the prism, the zero-order diffraction light then being reflected within the prism off a second surface (b) of the prism so that the zero-order diffraction light exits the prism as output light through a third surface (c) of the prism in the opposite direction of the laser source; and while the wavelength of the output light is changed by rotating the diffraction grating and the prism around a rotary shaft, the zero-order diffraction light is reflected and refracted within the prism so that the optical axis of the output light is not changed by the change in the wavelength of the output light.