Patent ID: 8675709

Claim:
Laser apparatus, comprising: an OPS-laser resonator configured to deliver continuous-wave (CW) radiation in a plurality of different longitudinal lasing-wavelengths, the OPS-laser resonator having an optical length determining a wavelength-spacing of the longitudinal lasing-wavelengths; a fiber-amplifier having a gain-fiber arranged to amplify the lasing-wavelengths of the OPS laser; a frequency-converter arranged to receive the amplified lasing-wavelengths, the frequency-converter including an optically nonlinear crystal arranged in an enhancement-resonator for converting the plurality of lasing-wavelengths to a corresponding plurality of frequency-converted wavelengths, the enhancement-resonator having an optical length equal to or an integer multiple of the length of the OPS-laser resonator such that the enhancement-resonator provides a plurality of resonance peak-wavelengths having the same wavelength-spacing as the lasing-wavelengths; and wherein the optical length of the enhancement-resonator is actively adjusted such that the resonance-peak wavelengths thereof having the same wavelength-spacing as the lasing wavelengths are adjusted to be equal to those lasing wavelengths.