Patent ID: 8270440

Claim:
A laser light source comprising: a pump light source comprising a semiconductor laser; a solid laser medium for excitation by light from the pump light source, wherein said solid laser medium is co-doped with Pr 3+ and Ho 3+ , each at 1˜3 %, and the oscillation wavelength of the solid laser medium is red light of 600-660 nm, or green light of 515-555 nm; and multi-mode means for changing at least one of a longitudinal mode or a transverse mode of laser oscillation of the solid laser medium, into a multi-mode, wherein the multi-mode means for changing the longitudinal mode of the oscillation wavelength of the laser medium into a multi-mode is an oversaturation absorber having a thermal lens effect for changing the transverse mode of the oscillation wavelength of the laser medium into a multi-mode, thereby the longitudinal mode and the transverse mode of the oscillation wavelength of the laser medium are changed into a multi-mode.