Abstract
We report a novel Raman polarization-flipping phenomenon that occurs within the 1s-2p manifold of Ne I when Raman and pump are both resonant in a single cavity, a situation that produces a wide range of stimulated electronic Raman Stokes and anti- Stokes lines exhibiting interesting competition effects.1 The pump laser, mode matched to the cavity of a commercial He–Ne laser (the standard 633-nm output is not scientifically important here and is used only to stabilize the cavity length) interacts passively with the 588.2-nm (1s5 → 2p2) Ne transition. The corresponding Raman line, 603 ran (2p2 → 1s4), actively lases in the He–Ne cavity. The Raman polarization is always linear and is aligned with one of the cavity principal axes, which are determined by residual mirror birefringence. However, the direction of the polarization can suddenly flip between these orthogonal states as the dye laser is scanned. The effect is reminiscent of the polarization behavior of longitudinal modes of the He–Ne laser itself as the length of the laser cavity is changed and the laser output frequency scans through the Doppler gain profile. Here, we stress, the cavity length remains fixed and the dye laser is scanned through a relatively small frequency range– that comprising a single cavity resonance.
© 1995 Optical Society of America
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