A new method to obtain a 212 nm laser source for Lyman-α light with CLBO crystals

摘要

We have been generating Lyman-α laser light by the sum-difference frequency mixing method using two 212.5 nm photons for two-photon resonant excitation of the 4P~55P[1/2]_0 state in Kr, subtracted by a photon with a tunable difference wave-length. To date, the 212.5 nm emission has been obtained by quadrupling single-mode 850 nm light by using two β-Ba_2BO_4 crystals. However, because of the low thermal conductivity of β-Ba_2BO_4 crystal, the generated 212.5nm beam became in an annular form. In this report, we will report on a new method for obtaining the Lyman-α light with CsLiB_6O_(10) crystals together with the experimental results of the resonance spectra of tritium and deuterium generated by nuclear reactions.