Pulsed dye laser applied to modulated spectroscopy magnetic circular dichroism.

A tunable jet-stream dye laser pumped by a cavity-dumped argon laser has been synchronized to a photoelastic modulator to measure magnetic circular dichroism. Gated signal amplification takes advantage of the laser's pulsed operation to detect weak dichroic signals. Comparative data show that the dye laser and gated amplification give a SNR better than that obtained with the previously used lamp, monochromator, and lockin detector. Other applications of the dye laser and gated amplification are discussed.