Abstract
We report a new Stark modulated optical pumping technique for transmission and external reflection spectroscopy. In this technique, Stark field pulses alter the transmission of a laser beam through an optically resonant solid. During a pulse cycle the beam intensity switches from a high output as a result of the bleaching effect of optical pumping to a reduced output due to absorption. This change in intensity allows a high frequency signal modulation, and when combined with phase-sensitive detection, signal changes as small as 4 × 10 -6 can be detected. We demonstrate the technique by carrying out spectroscopy of a 3H 4(Γ1)− 1D 2(Γ1) ( λ = 592.5 nm) transition in Pr 3+: LaF 3. Absorption satellites due to Pr 3+ ion pairs are observed in transmission. A dispersion in the reflected signal due to the 3H 4(Γ1)− 1D 2(Γ1) line is detected, and is utilized for NQR spectroscopy of the Pr spin. Possible applications of the technique are discussed.
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