The H-401 from L3Harris Technologies is a Fused Silica Acousto-Optic Modulator (AOM) that has an optical wavelength from 257 nm to 532 nm. It has a nominal center frequency of 100 MHz and a deflection bandwidth of 85 - 115 MHz with a total deflection angle of 1.83 mrad. This AOM has a minimum on/off contrast ratio of 30 dB and diffraction efficiency of over 80% at central frequency. It has an optical beam diameter of 0.25 – 3.5 mm (horizontal) & up to 0.35 mm (vertical) and features RoHS Compliance.
The H-401 changes only the phase of the RF source waveform to modulate optical intensity, thus assuring that constant input power is always applied to the device regardless of the data rate conditions. This also eliminates transient thermal conditions that occur with conventional AO drive techniques and improves beam pointing stability. It has an advanced coherent transducer array technology employed with precise digital drive technology that allows it to be operated in either the RF phase modulation mode or a conventional on/off pulse RF mode for extended on/off contrast where beam-pointing stability is not critical. It is available in a module that measures 1.95 x 1.5 x 1 inch and is ideal for optical modulation in the ultraviolet (UV) & visible systems and predeflection, modulation, pointing adjustment & micromachining in UV laser systems.