Single-mode solid-state diode-pumped lasers

摘要

A single mode solid-state laser comprises a laser crystal 20, e.g. Nd:YVO 4 , Nd:YAB or Nd:YSAG, end-pumped by a laser diode 10 via butt-coupled fibre 12. The optical cavity of the laser is defined between one flat face HR of the crystal which is coated to be highly reflective, and a partially reflective flat surface PR. The partially reflective flat surface PR may be a coating on a mirror 30, on the face of the crystal 20 opposite the face HR, or on a surface of a frequency-doubling crystal. In the last case, the coating on the surface PR reflects light at the fundamental frequency but transmits light at the doubled frequency, while the coating on the surface HR reflects light at both frequencies.