Two-photon absorption dispersion spectrometer for 1.53 µm eye-safe Doppler LIDAR.

ABSTRACT

Based upon resonant two-photon absorption within a rubidium cell and 780 nm pump light, a birefringent medium for 1.530 µm is induced that changes rapidly with frequency. The birefringence is exploited to build a spectrometer that is capable of measuring the Doppler shift of scattered photons.