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GoPhotonics is highlighting a range of advanced Acousto-Optic Q-Switches engineered for high optical power handling, fast switching speeds, and efficient intracavity modulation across a variety of laser platforms. As industries increasingly rely on high-energy pulsed lasers for micromachining, marking, medical procedures, spectroscopy, and scientific research, acousto-optic (AO) Q-switches continue to play a vital role in controlling pulse generation and laser energy delivery.

These devices are optimized for Nd, fiber, and solid-state laser systems, providing precise pulse control while maintaining high optical transmission and low insertion losses.

AQS-271GA4 Designed for 1.047-1.064 µm Laser Systems

The AQS-271GA4 from IntraAction Corp. is an acousto-optic Q-switch designed for laser systems operating from 1.047 to 1.064 µm. The device operates at an RF frequency of 27.12 MHz and features a 1 mm active aperture. Built using dense flint glass, it supports random optical polarization and offers an optical power capability of 500 MW/cm².

The Q-switch requires 2 W of RF power and has a rise time of 177 ns/mm. Additional specifications include a beam separation angle of 7.9 mrad, VSWR of 1.25:1, 50 Ohm input impedance, and an SMA RF connector. The AQS-271GA4 also provides a diffraction efficiency of 0.5, making it suitable for applications requiring reliable Q-switching performance in solid-state laser systems.

Industry Standard AO Q-Switch Combines High Transmission with Low Reflectivity

The Industry Standard AO Q-Switch from Gooch & Housego is a fused silica acousto-optic Q-switch designed for operation at 1064 nm. Available with RF frequencies ranging from 24 MHz to 68 MHz, the device supports active apertures from 1.6 mm to 8 mm, providing flexibility for different laser configurations.

The Q-switch features an anti-reflective coating with reflectivity of less than 0.2% per surface and delivers single-pass transmission above 99.6%. It has a VSWR of up to 1.2:1, a damage threshold exceeding 1 GW/cm², and a maximum static insertion loss of 6%. Available with both compressional and shear acoustic modes, the device requires 50 W RF power in compressional mode and 100 W RF power in shear mode. The AO Q-switch is housed in a package measuring 62 mm x 37.5 mm x 63.4 mm and supports a BNC connector. According to the manufacturer, it is intended for material processing applications including marking, engraving, scribing, and surface treatment, as well as medical surgery and particle image velocimetry (PIV).

QCQ80-A0.8-L1064-Z32-Cxx Offers High Transmission and Fast Switching

The QCQ80-A0.8-L1064-Z32-Cxx from AA Opto-Electronic is a quartz crystal acousto-optic Q-switch designed for operation at 1064 nm. The device has a carrier frequency of ±80 MHz and an active aperture of 0.8 mm x 0.8 mm. It supports linearly and vertically polarized light and has an acoustic mode velocity of 5740 m/s.

The AO Q-switch provides optical transmission greater than 99%, a diffraction efficiency of 85%, and an optical power density of 500 MW/cm². It has a minimum static extinction ratio of 30 dB and a rise time of 30 ns, enabling fast modulation within laser cavities. Additional specifications include a separation angle greater than 29.6 mrad, VSWR up to 1.2:1, and a damage threshold exceeding 500 MW/cm². The device has an optical length of 32 mm, requires 15 W RF power, and features a 50 Ohm input impedance. Supplied in an IN PRO 181 package measuring 33 mm x 36.5 mm x 25.8 mm, the Q-switch is RoHS compliant and supports an SMA female connector with a 35 cm cable length.

FSQ-80-5-BC Provides Optical Modulation at 80 MHz

The FSQ-80-5-BC from Brimrose Corporation is an SiO₂ acousto-optic Q-switch designed for operation at 1060 nm. The device operates at a frequency of 80 MHz and features an active aperture of 1 mm. It supports linearly polarized light and offers a digital modulation bandwidth of 6.5 MHz.

The Q-switch delivers optical transmission of 99.5%, a maximum diffraction efficiency of 25%, and a rise time of 85 ns. It has an acoustic velocity of 5.96 x 10³ m/s and a wavefront distortion specification of λ/10. Additional characteristics include a 14 mrad separation angle, VSWR of 2.1:1, and 50 Ohm input impedance. The device supports analog light intensity modulation and digital on/off switching and is available with optional water or thermoelectric cooling. According to Brimrose, the FSQ-80-5-BC is suitable for laser marking, cutting, pulsed holography, lithography, 3D microfabrication, medical surgery, optical data storage, and OEM laser system designs.

Q1025-SFxxL-H Supports High Optical Power and Short Laser Pulses

The Q1025-SFxxL-H from Acal BFi is an acousto-optic Q-switch designed for laser systems operating from 1047 nm to 1064 nm. The device delivers a maximum power of 3 W and is available with center frequencies of 41 MHz or 80 MHz. It features a 1 mm active aperture and a damage threshold of 300 MW/cm².

The AO Q-switch integrates both analogue and digital RF drivers and incorporates Soft-Start RF amplitude control to provide effective first-pulse suppression. The device utilizes a conduction cooling system and is designed for use as a fast intracavity switch in applications requiring high optical powers and short laser pulses.

Acousto-Optic Q-Switches for Modern Pulsed Laser Systems

The featured acousto-optic Q-switches demonstrate the range of technologies available for controlling pulse generation in modern laser systems. With operating frequencies spanning 24 MHz to 80 MHz, active apertures from 0.8 mm to 8 mm, and damage thresholds reaching 1 GW/cm², these devices support a broad spectrum of laser architectures and performance requirements. Their combination of high optical transmission, efficient modulation, and robust construction makes them valuable components for industrial processing, scientific instrumentation, medical systems, and advanced photonics research.

Click here to learn more about acousto-optic q-switches.