Anti-Stokes Raman laser investigations on atomic Tl and Sn

Hong Yuan Ling, Jian‐Min Yuan, Lorenzo M. Narducci +2 more

Jie Zhang, Terence A. King

The origin of the dip and asymmetry in the tuning curve of the Tl anti-Stokes Raman laser is investigated. The dip is mainly attributed to a defocusing effect of the pumping dye laser beam caused by Tl atomic number density gradient over the beam cross section. The asymmetry is assigned to different pumping dye laser power densities due to focusing on the red side and to defocusing on the blue side of the resonance of the Tl 62P3/2-72S1/2 transition.

Justin Bohnet, Zilong Chen, Joshua M. Weiner +2 more

B. Wellegehausen, Klaus Ludewigt, H. Welling

The anti-Stokes Raman laser process is an interesting method for frequency upconversion and generation of tunable UV radiation. This method requires no index matching and allows high-conversion efficiencies and output energies and large frequency shifts in a single step. A basic requirement is a population inversion between a metastable level and a suitable lower-lying level. So far anti- Stokes laser emission has been demonstrated using the metastable TI (6P3/2). l(5P1/2). and Br (4P1/2) levels, where a population inversion with respect to the corresponding atomic ground states has been generated by photodissociation of suitable compounds.1-3 For the Tl system efficiencies of 10 % and output energies of ~1 mJ (at 377 nm) have been reported,1 and with Br a shortest wavelength of 149 nm was possible by upconversion of 157.5-nm radiation of a F2 laser.3

V. N. Lugovoǐ

J. C. White, Don O. Henderson

The tuning and saturation behavior of the anti-Stokes Raman laser is examined experimentally for the first reported time in a Raman medium of inverted, metastable Tl* (6p(2)P degrees (3/2)). Two significant regions of saturation are identified that correspond to atomic saturation and pump depletion of the input laser field.