We demonstrate the generation of 150-mW blue coherent single-mode radiation at 457 nm in a compact and inexpensive setup. The light is generated by frequency doubling the radiation of a master oscillator power amplifier (MOPA) system in an enhancement cavity with a potassium niobate (KNbO<sub>3</sub>) crystal. The MOPA consists of a 914-nm single-mode diode laser and a broad-area diode laser (BAL) as the amplifier. The BAL is a multimode laser with a specified wavelength of 938 nm. Sufficient gain at 914 nm is obtained by antireflection coating the BAL front surface and by cooling it to −10 °C.
© 2003 Optical Society of America
(140.2020) Lasers and laser optics : Diode lasers
(140.3280) Lasers and laser optics : Laser amplifiers
(140.5960) Lasers and laser optics : Semiconductor lasers
(190.2620) Nonlinear optics : Harmonic generation and mixing
Valentina Ruseva and Jan Hald, "High-Power 457-nm Light Source by Frequency Doubling of an Amplified Diode Laser," Appl. Opt. 42, 5500-5507 (2003)