Solid 226 nm laser pumped by a Nd:YAG laser for two-photon absorption detection of oxygen

Source abstract

We present a solid 226 nm deep ultraviolet laser system pumped by a Nd:YAG laser. A diamond Raman laser with a 1485 nm wavelength was generated up to 2.53 mJ pumped by a 9.7 mJ 1064 nm laser, which is the highest pulse energy of a second Stokes diamond Raman laser pumped by a 1064 nm laser as we know. Then, the Raman laser is mixed with the frequency-quadrupled 1064 nm laser to produce the 226 nm laser. The maximum output pulse energy at 226 nm reaches 0.49 mJ. The overall conversion efficiency from 1064 to 226 nm is up to 1.14%, which is significantly higher than conventional optical parametric oscillator technology for the generation of 226 nm laser. The 226 nm laser system has been used in a laser-induced fluorescence (LIF) experiment of oxygen two-photon to demonstrate its potential for LIF measurements.