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A new electro-optic modulator is designed and constructed. It
is suitable for maintaining modulation at a high frequency and can be
used to generate ultra-wide-sideband signals to form ultrashort optical
pulses. In experiments, phase modulation with a modulation index of 57
rad is successfully obtained at 16.25 GHz, and thereby optical sidebands
extending over widths as wide as 1.85 THz are attained. The sidebands
produced are broad enough to form subpicosecond pulses using the
chirping-compression method.
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