Consideration of angular acceptance angle in BBO crystal on a highly efficient second harmonic generation
✍ Scribed by Feng-Tie Wu; Wen-Zhen Zhang
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 201 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0030-3992
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✦ Synopsis
The angular acceptance angle (phase matching acceptance angle) Dy in BBO crystal is theoretically calculated in milli-radian magnitude. To satisfy a fully phase matching condition of a laser beam and obtain ecient conversion of SHG, an intracavity frequency doubled (IFD) Nd:YAP mode-locked laser with a confocal unstable resonator and a BBO crystal as an SH generator is designed. Thus, fully phase matching of an approximately ideal plane wave can be realized in BBO crystal and an energy conversion eciency of 81% for SHG from 1.08 to 0.54 mm has been achieved. The pulse durations of fundamental wave and maximum energy ¯uctuations are measured and calculated. The results are compared with those of a convex-antiresonant ring (ARR) unstable resonator IFD laser.