Abstract

Blue 465-nm radiation is generated by frequency doubling of the output of an InGaAs diode-laser oscillator–amplifier system in critically phase-matched LiB3O5 (LBO). The diode-laser system emitted 4  W of single-frequency 930-nm radiation in a near-diffraction-limited beam M2<1.2. The laser power is enhanced to values of up to 150  W in a resonant external ring cavity. The LBO crystal is placed at a resonator internal focus. The frequency doubling in the LBO crystal generates blue radiation at 465  nm with a power of 1  W. The spectral width of the blue radiation is less than 3  MHz, and the value of the M2 beam parameter is less than 1.2.

© 1999 Optical Society of America

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