Radio frequency modulation in infrared laser Stark spectroscopy

Abstract

The effects of a radio frequency electric field modulation on Stark tuned level crossings and saturated absorptions at 10/~m are investigated and compared with the dressed molecule theory. Applications are made to rotational quantum state assignment and electric dipole measurements. The dipole moments of NH2D in the ground and v2--1 state are measured to be ~"c --1.4579 + 0.0019 D, /,=1.08 _+0-13D.

Stabilisation of carbon dioxide lasers using the Stark effect

“…Tuning rates for these transitions may be calculated from the known molecular constants. For the remaining absorptions, tuning rates were measured using the modulation technique described by Rackley and Butcher (1980). A radio frequency signal, for example at 20 MHz, is applied to the Stark electrodes while a saturated (Lamb dip) Stark spectrum is observed.…”

“…A large number of Stark-tuned absorptions were observed using the laser-Stark spectrometer described by Rackley and Butcher (1980). From the results of this spectroscopic investigation a set of potentially useful absorptions were selected, and are reported in table 1.…”