Anti-Stokes Raman Emission in hverted Atomic Selenium

Guang S. He, Yiping Cui, Gen C. Xu +2 more

V. N. Lugovoǐ

Klaus Ludewigt, K. Birkmann, B. Wellegehausen

Robert L. Carman, W. Howard Lowdermilk

Raymond C. Y. Auyeung, D. G. Cooper, B. J. Feldman

The generation of 145.6-nm radiation by stimulated anti-Stokes Raman scattering in inverted atomic selenium was first reported by Ludewigt et al. 1 We have performed experimental studies of this process in similar excitation conditions, which allow us to compare some of the results in the two studies. The inverted population of the selenium (4p4)1S0 metastable state relative to the (4p4)3P0 state was prepared by photodissociation of COSe vapor using broadband 193-nm radiation from an ArF excimer laser. The pump beam at 205.1 nm was generated by the first-order Stokes shift in deuterium of narrowband (0.27-cm–1), 193-nm radiation from a separate, tunable ArF laser. The pump beam was tuned near the selenium (4p4)1S0–(4p35s)3P1 intermediate resonance to generate tunable, coherent radiation at 145.6 nm. We have studied the process in a variety of experimental conditions. Factors affecting the conversion efficiency and tunability include the initial COSe pressure, the intensities and relative timing of the photolyzing and pump beams, and the presence of buffer gases. The experimental results are compared with theoretical calculations based on a recently developed three-level model2 which incorporates Doppler broadening and arbitrary decay times.

J. C. White, Don O. Henderson

The first observations of UV and VUV anti‐Stokes Raman laser emission are reported. Anti‐Stokes Raman scattering of 532 nm and 355 nm pump lasers using inversted metastable T1 atoms resulted in stimulated emission at 376 nm and 278 nm respectively. Also, a tunable 178 nm anti‐Stokes laser using metastable I atoms has been constructed.