Abstract

We have presented the operation that a XeCl excimer laser radiation is shifted in H₂ gas into several stokes lasers with the wavelength in the UV and visible region, and that the third order stokes radiation, in turn, successfully pumps the Ti:Al₂O₃ oscillator to generate a tunable output in the deep red region. The Raman conversion can be selectively controlled into different orders of stokes radiation by means of hydrogen gas pressure tuning. The selective shift also can be realized by using H₂ + rare gas mixtures. The green emission from the XeCl/H₂ Raman shifting is the particular interest in the present research. The green laser from the Raman cell increases with the increasing of the pumping 308 nm laser energy. At the pump of 308-nm laser of 250 mJ, energy conversion efficiency of S3 (499 nm) can reach 10%. As for the Ti:Al₂O₃ laser performance by the 499 nm laser pumping, the pulse energy conversion efficiency has reached as high as 41% for the 763 nm output with excellent optical quality and the laser can be operated over the tuning range of 680–843 nm without changing the cavity mirrors. The slope quantum efficiency for the same radiation is very high, about 90%. With this investigation, it is indicated that a simple laser system based on XeCl laser can be combined to offer wavelength diversity for different laboratory uses. This system produces many laser beams in the visible and UV region from the stokes, and a tuning laser beam in the deep red region from the Ti:Al₂O₃ oscillator.

© 1995 IEEE