Abstract
We describe the theory and experimental realization of an ultrafast phase-matched electrooptic modulator, working with 486 nm light and a modulation frequency of 84 GHz. To achieve phase matching for arbitrarily high modulation frequencies the laser beam is guided with several internal total reflections along a zig-zag path through a LiTaO3 crystal. The method was studied experimentally with a 84 GHz modulator and a highly stable 486 nm dye laser. The maximum modulation index of this setup was about 5.0%. Beat signals between either the first- or the second-order sidebands and another laser were observed. This modulator was used to directly measure the 671 GHz 1S–2S isotope shift of hydrogen and deuterium with radio-frequency accuracy.
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Leibfried, D., Schmidt-Kaler, F., Weitz, M. et al. Phase-matched electrooptic modulator at 84 GHz for blue light: Theory, experimental test and applications. Appl. Phys. B 56, 65–70 (1993). https://doi.org/10.1007/BF00325242
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DOI: https://doi.org/10.1007/BF00325242