title: Development of two-color laser system for high-resolution polarization spectroscopy measurements of atomic hydrogen.
abstract: We have developed a high-spectral-resolution laser system for two-photon pump, polarization spectroscopy probe (TPP-PSP) measurements of atomic hydrogen in flames. In the TPP-PSP technique, a 243-nm laser beam excites the two-photon 1S-2S transition, and excited n=2 atoms are then detected by polarization spectroscopy of the n=2 to n=3 transition using 656-nm laser radiation. The single-frequency-mode 243 and 656-nm beams are produced using injection-seeded optical parametric generators coupled with pulsed dye amplifiers. The use of single-mode lasers allows accurate measurement of signal line shapes and intensities even with significant pulse-to-pulse fluctuations in pulse energies. Use of single-mode lasers and introduction of a scheme to select nearly constant laser energies enable repeatable extraction of important spectral features in atomic hydrogen transitions.
authors.affiliation: School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47906, USA.
authors.forename: A H
authors.initials: AH
authors.lastname: Bhuiyan
authors.forename: A
authors.initials: A
authors.lastname: Satija
authors.forename: S V
authors.initials: SV
authors.lastname: Naik
authors.forename: R P
authors.initials: RP
authors.lastname: Lucht