Wavelength conversion laser device and an image display device

Of watts and a high output to realize a highly efficient wavelength conversion laser device. The optical resonator consists of a pair of opposing reflector having a reflecting surface shaped to be lower than the optical resonator loss optical resonator loss to other horizontal transverse mode for the required horizontal transverse mode of the laser beam comprising a semiconductor laser comprising, a wavelength converter in which the laser light is wavelength-converted into a harmonic.