SKU: FEOM
The FEOM Free-Space Electro-Optic Modulator is a crystal-based resonant modulator engineered to operate at a fixed resonance frequency, allowing low-voltage drive for phase, polarization, or amplitude modulation of lasers. Resonance frequencies are selectable from 5 to 20 MHz. We offer both a standard version and a high-power version using RTP crystals to accommodate different application requirements. The standard unit uses a single crystal pair, while wavelengths above 1000 nm require two pairs to achieve full modulation depth. The design minimizes piezo-electric effects and charge buildup, producing the characteristic sinusoidal response of resonance-driven devices. For amplitude modulation, polarized input light is required because the modulation process depends on controlling intensity through the polarization state. With input and output polarizers, the device achieves a significantly enhanced extinction ratio (ER).
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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