title: High-power 457-nm light source by frequency doubling of an amplified diode laser.
abstract: 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 (KNbO3) 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 degrees C.
authors.affiliation: Danish Institute of Fundamental Metrology, B307 Matematiktorvet, DK-2800 Kgs Lyngby, Denmark.
authors.forename: Valentina
authors.initials: V
authors.lastname: Ruseva
authors.forename: Jan
authors.initials: J
authors.lastname: Hald