Patent ID: 8411714
Filing Date: 2013-04-02
Classification: G02F,H01S

Abstract:
1. A wavelength conversion laser light source, comprising: a fundamental wave laser light source; a wavelength conversion element for converting a fundamental wave emitted from the fundamental wave laser light source into a harmonic wave, the wavelength conversion element being made of a material whose light absorption properties are subjected to change according to an output level of a harmonic wave; an output setting section for setting a harmonic wave output power value; and an element temperature switching section that switches a temperature of the wavelength conversion element according to a harmonic wave output level as set in the output setting section, wherein the element temperature switch section includes an element temperature holding section that holds the wavelength conversion element at the temperature as switched by the element temperature switching section, the wavelength conversion element has a beam diameter variable structure for varying a beam diameter of a harmonic wave outputted from the wavelength conversion element, the wavelength conversion laser light source further comprises a beam shape abnormality detection mechanism for detecting an abnormality in beam shape of the harmonic wave outputted from the wavelength conversion element, the wavelength conversion element having the beam diameter variable structure is a MgO: LiNbO the harmonic wave has an output power of higher than 1.6 W and not higher than 3 W so that an abnormality in beam shape does not occur.