Acousto-Optic Modulators (AOM) | SIMTRUM Photonics Sotre

Acousto-optic modulators (AOM) are generally used outside the laser cavity to change the intensity of the incoming laser (amplitude-modulated AM). This can be simple ON/OFF modulation for quick switching or variable level modulation to achieve intensity modulation. The modulation mode is determined by the type of RF driver and can be digital (ON/OFF) or analog (sinusoidal, square wave, linear, random…). 

Generally, the RF driver of AOM adopts fixed frequency, the key parameter of the AOM is the rise/fall time, which defines the achievable “speed” or amplitude modulation bandwidth of the modulation. The rise/fall time is proportional to the beam diameter inside the modulator. Therefore, the diameter of the incident laser beam must be controlled in order to obtain a fast rise time. The AOM can be used as a shutter (cyclic switch at a set frequency) or as a variable attenuator (dynamically controlling the intensity of the transmitted light). Laser modulation is achieved by controlling the sound wave in the acousto-optic crystal caused by radio frequency.

SIMTRUM offers a series of free-space (up to 24 channels in a single channel) and fiber-coupled (bias-preserving and non-bias-preserving) AOM with a frequency range of up to 300 MHz and a rise as low as 6 ns. We provide AOM-matched series of RF drivers you can choose the corresponding RF driver according to the product specification.

AO Free-Space Modulators

AO Fiber-Coupled Modulators

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