Patent ID: 8085823

Claim:
A laser source device comprising: a light emission unit which emits laser beam having first wavelength; a first mirror which selectively reflects S-polarized light contained in the first wavelength laser beam emitted from the light emission unit in a direction different from the direction toward the light emission unit and transmits second wavelength laser beam; a second mirror which receives laser beam reflected by the first mirror and reflects laser beam having first wavelength and contained in the received laser beam toward the first mirror; and a wavelength conversion element disposed between the first mirror and the second mirror and converts at least a part of S-polarized light with respect to the first mirror contained in the received first wavelength laser beam into laser beam having second wavelength, wherein: the wavelength conversion element includes a plurality of wavelength conversion element pieces having polarization inversion axis and containing cyclic polarization inverted structure in a cyclic direction orthogonal to the polarization inversion axis, the wavelength conversion element pieces being affixed to one another in a direction along the polarization inversion axis; and the polarization inversion axis is disposed parallel with the oscillation direction of the S-polarized light.