SKU: AOMS
The AOMS series fiberoptic acousto-optic modulators enable high-speed optical intensity modulation optimized for UV wavelengths. Built with high-purity quartz, they feature low insertion loss, a high UV damage threshold, and fast switching. When driven at the 111 MHz resonance frequency, the device satisfies the Bragg diffraction condition, deflecting light at a specific angle. Intensity is controlled by varying the RF drive amplitude (0–5 V via SMA input). The modulator inherently introduces a positive frequency shift, with negative shift versions available upon request. It operates over a narrow wavelength range, with the output angle dependent on the input wavelength. A matching driver is available.
The AOMS rise/fall time is directly related to the optical beam diameter, following the relation Rise Time ≈ D / v, where D is the laser beam diameter in the acoustic propagation direction and v is the acoustic velocity in the AOM crystal. Therefore, reducing the beam size increases modulation speed and bandwidth.
The acousto-optic modulator utilizes a shear-mode interaction geometry, which provides efficient diffraction for both random and linearly polarized input light. The AOM design is in shear mode well suited for both random polarization and polarized.
Optical power handling depends on the clear aperture size and the electro-optic (EO) material selected. Aperture size and crystal length dictate the required drive voltage. Compatible drivers are available on our website. For high-speed modulation, acousto-optic modulators (AOMs) should also be considered.
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