Abstract

Much interest has been attracted recently to the problem of design compact blue-green light sources. Most the activity is concentrated around the frequency doubling of semiconductor lasers with the wavelengths of 0.8-0.9 μm. On the other hand rare-earth doped fiber lasers are an interesting alternative to diode lasers due to their tunability, high quality output beam etc [1]. Such lasers are compatible with channel KTP-waveguides [2] which are very promising for the nonlinear frequency conversion from the near-IR to green and blue. The phase-matched type II interaction or quasi- phase-matched type I interaction can be used depending on the fundamental wavelength [3].

© 1992 Optical Society of America