[OPTICAL REVIEW Vol. 19, No. 6 (2012) 405-408]
© 2012 The Japan Society of Applied Physics
Watt-Class Green-Emitting Laser Modules Using Direct Second Harmonic Generation of Diode Laser Radiation
Christian FIEBIG, Jörg FRICKE, Mirko UEBERNICKEL, Daniel JEDRZEJCZYK, Alexander SAHM, and Katrin PASCHKE
Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany
(Received May 31, 2012; Revised August 3, 2012; Accepted August 9, 2012)
Large-area high-resolution displays, using a flying-spot to create the picture, require light sources in the red, green and blue wavelength range with a high optical output power and nearly diffraction limited beam. In this paper we present experimental results of high-brightness distributed Bragg reflector tapered diode lasers at 106x nm that can be used for single-pass second harmonic generation into the green. Based on these lasers we developed compact (2.5 cm3) green laser modules with an output power of 1 W at 53x nm and an electro-optical conversion efficiency of about 5%. The output power stability is better than 2% and the wavelength stability is ± 10 pm. The excellent beam quality Mσ2< 2 of the green light allows operation in flying spot application systems. Furthermore, we estimate that our concept allows power scaling up to 2 W by using nonlinear planar waveguide crystals and into the multi-watt level by spectral beam combining.
Key words: distributed Bragg reflector tapered diode laser, flying spot, SHG, green-emitting laser