Investigation on intracavity second-harmonic generation at 1.06 mu m in YCa4O(BO3)(3) by using an end-pumped Nd : YVO4 laser

Intracavity second-harmonic generation (SHG) at 1.06 mu m in YCa4O(BO3)(3) (YCOB) crystals cut for different type I phase-matching directions of (thet a, (Psi))=(64.5 degrees, 35.5 degrees) and (33 degrees, 9 degrees) was inve stigated by employing an end-pumped Nd:YVO4 laser formed with a three-mirro r folded resonator. CW SHG output power of 2.35 W was obtained in the phase -matching direction of(64.5 degrees, 35.5 degrees) with an optical conversi on efficiency of 18.1%, while the effective intracavity SHG efficiency was determined to be 42%. The intracavity SHG output was found to be insensitiv e to the varying temperature in YCOB crystal. The internal losses of YCOB c rystal were measured to be 0.013 cm(-1). (C) 2000 Elsevier Science B.V. All rights reserved.