Eyesafe laser based on ring-cavity KTP optical parametric oscillator

摘要

A high efficient ring-cavity optical parametric oscillator at 1.57μm eye-safe range using three non-critically phase-matched KTP crystals is researched and experimentally demonstrated. The primary advantage of the ring-cavity OPO is that the resonator mirrors are at 30 degrees to the pump beam, so they do not provide any feedback to the pump laser. The signal energy of 75mJ with the pulse width of 6.6ns is obtained under the input pump pulse of 200mJ. This result provided a clear demonstration that high pump-to-signal energy conversion (up to 37.5%) can be achieved from the ring-cavity OPO by single-pass pumped method.