Abstract

Intracavity-frequency-doubled, diode-pumped lasers are attractive sources of visible light. The best characterized materials for a diode-pumped, frequency-doubled system are Nd:YAG as the laser medium and KTP as the nonlinear medium. Since frequency doubling of a 1064 nm fundamental wavelength in KTP requires Type II phasematching, both fundamental polarization states must be excited to generate the second harmonic. Poynting vector walk-off between these fundamental polarization states can introduce resonator loss.¹ By orienting the KTP at an oblique angle of incidence within the resonator and fabricating the KTP so that the phasematching condition is satisfied, this loss can be eliminated.

© 1993 Optical Society of America