Acousto Optic Modulator AOM Laser Optical Amplifier Q-switch

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Characterization and optimization of the laser diffracted by an acoustic-optical modulator in the infrared region

Characterization and optimization of the laser diffracted by an acoustic-optical modulator in the infrared region



An acousto-optic modulator (AOM) uses the acousto-optic effect to diffract and shift the frequency of light using sound waves (usually at radio-frequency). They are used in lasers for Q-switching, telecommunications for signal modulation, and in spectroscopy for frequency control. Check the detai at wikipedia.

A typical Acousto optic modulator as following:

1045 nm  Acousto optic modulator

Wavelength :  1030nm–1064nm (operating wavelength is 1045 nm)

The acousto-optic modulator has a central wavelength and a wavelength range, the central wavelength here is 1045n, while the range is 1030nm–1064nm.

Operating Wavelength Range(nm): +/-5

Typical Insertion Loss(dB): <1.5

In acousto-optic modulator, insertion loss is the loss of signal power resulting from the insertion of AOMs in an optical fiber and is usually expressed in decibels (dB). Check more details about Insertion Loss here at wikipedia.

If the laser output power transmitted to the load before insertion is PT and the power received by the load after insertion is PR, then the insertion loss in dB is given by:


Max. Insertion Loss(dB): 2.0

Min. Isolation(dB): 45

The laser signal strength through the AOMs in the reverse transmission process of laser in the acousto-optic modulator. The signals below a certain power cannot pass through the AOMs. Some signals (generally mainly referred to as spurious signals reflected by the end faces of the fiber) are shielded without affecting the transmission quality.

Min. Return Loss(dB): 50

Return loss is the loss of laser power in the signal returned/reflected by a discontinuity in optical fiber. This discontinuity can be a mismatch with the terminating load or with a device inserted in the line. Refer to Return Loss at wikipedia.

Frequencycy : 200 MHz

Modulate Frequencycy  is 200 MHz

Fiber Type : L06– 6/125 (single mode for 1045 nm, so HI1060 is also fine)

Most of the AOMs can be customized to use different fiber types.

Fiber Jacket on In&Out : B– Bare Fiber

Fiber Length : 1.0 m

Optical Power(CW)(W): 1.0

Driving power(W): 2

Working Frequencycy(MHz): 200 MHz

VSWR(MHz): <1.2:1(50Ω)

Tensile Load(N): 5

Operation Temperature(℃): 10~+50

The AOM will be used as a +200 MHz Frequency-upshifter