Acousto optic modulators (AOM) are commonly used to adjust laser intensity (amplitude modulation,AM) outside the laser cavity. This can be simple ON/OFF modulation for fast switching, or variable modulation for laser intensity. The modulation mode is determined by the type of RF driver, which can be digital (on/off) or analog (sinusoidal, square wave, linear, random, etc). Generally, the RF driver of AOM operates at a fixed frequency.

The key parameter of 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 within the modulator. Therefore, in order to obtain a fast rise time, it is necessary to control the diameter of the incident laser beam.

AOM can be used as a shutter (to cycle switch according to the set frequency) or as a variable attenuator (to dynamically control the intensity of transmitted laser beam).

Goptica has developed a series of free-space (up to 24 channels in a single channel) and fiber-coupled (PM fiber and non-PM fiber) AOM with a frequency range of up to 300 MHz and a rise time as low as 6 ns, wavelength cover from UV to far infrared(266, 343, 355, 532, 800, 1045, 1030, 1064, 1553, 9300, 10600 etc). AOM selects AO materials with excellent quality (Fused quartz, Quartz crystal, Ge crystal, etc.), which can be designed into shear and longitudinal wave mode according to needs. High quality optical polishing, anti-reflective coatings with low reflection and high damage threshold, reliable welding techniques, and novel acoustic management and optical mechanical design techniques enable excellent thermal management, maintaining excellent beam quality and high transmittance.

Application:

Intensity modulation,laser radar, laser switch,chopper,laser precsion machining.

Product specifications and manuals

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