Passive Q-Switch Lasers

Image Pulsed DPSS Lasers Saturable Absorber Passive Q-Switch Example DiagramPassive q-switches use a saturable absorber, which can be a crystal (typically Cr:YAG), a passive semiconductor, or a special dye. Passive q-switches take advantage of a process known as saturable absorption.  Saturable absorption derives from the fact that there is a limit to the amount of light that a material can physically absorb at a given wavelength before the energy level becomes saturated and the material becomes temporarily transparent.  As a result, if a saturable absorbing material is placed inside of the laser cavity, it will absorb all of the spontaneously emitted photons until it reaches saturation where it will then allow the photons to pass through and initiate stimulated emission.  In a saturable absorber, the time it takes for for excitation to resolve after after stimulation by an energy source is referred to as recovery time. Ideally, the recovery time is some period longer than that of the pulse duration. This condition helps avoid undesired energy loss. However, if recovery time is too long, premature lasing can occur when the laser’s gain recovers and the saturable absorber is still ‘open.’ A good rule of thumb is to have a recovery time that is longer than the pulse duration, but shorter than the upper-state lifetime of the gain medium to avoid unwanted lasing and pulse issues.

Our Products

RPMC offers a selection of passively Q-switched lasers, including Pulsed DPSS Lasers, Ultrafast Lasers, Microchip Lasers (Microlasers), and MIL-Spec. Lasers. Wavelength options include the UV, Blue, Green, NIR, and SWIR spectral regions, and pulse width options available from 40ns down to 7 ps.

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In conclusion, if you have any questions or would like some assistance please contact us here. Furthermore, you can call us at 636.272.7227 to talk to a knowledgeable Product Manager. Alternatively, use the filters on this page, or check out our ‘How to Select a Pulsed Laser‘ version of this page to assist in narrowing down the selection. Finally, head to our Knowledge Center with our Lasers 101 page and Blogs and Whitepapers pages for further, in-depth reading.

Suggested Reading

The Advantages and Disadvantages of Passive vs Active Q-Switching

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Series

Manufacturer

Picture Part Number Type Wavelength (nm) Output power (W) Pulse energy (uJ) Pulse width Rep rate Q-switch type
NPS-1064 Pulsed DPSS Lasers, Ultrafast Lasers 1064 0.050, 5.0, 10.0 0.125, 0.250 7ps 40MHz Passive
NPS-355 Pulsed DPSS Lasers, Ultrafast Lasers 355 1.0 0.025 7ps 40MHz Passive
NPS-532 Pulsed DPSS Lasers, Ultrafast Lasers 532 1.0, 5.0 0.025, 0.125 7ps 40MHz Passive
One-1030-100: 1030nm Miniature Q-Switched Laser One-1030 Pulsed DPSS Lasers 1030 1.0, 3.0 100.0 5ns - 20ns 30kHz, Single shot to 10kHz Passive
OT-XX Pulsed DPSS Lasers, Mil-Spec Lasers 1540 0.001, 0.0012, 0.002, 0.0022, 0.0024, 0.0025, 0.0045, 0.0095, 0.020, 0.030, 0.075, 0.100, 0.200 900.0, 1000.0, 1200.0, 1500.0, 1900.0, 2000.0, 2100.0, 2200.0, 2400.0, 2500.0, 10000.0 9ns, 10ns, 12ns, 15ns, 20ns, 24ns, 35ns, 40ns 1Hz, 5Hz, 10Hz, 20Hz, 30Hz Active, Passive
Bright Microlaser Microchip SB1 Laser SB1-1064 Pulsed DPSS Lasers, Microchip Lasers 1064 0.008, 0.012, 0.040, 0.110, 0.150, 0.200, 0.225, 0.400 2.0, 15.0, 20.0, 30.0, 40.0, 60.0, 80.0 400ps, 1.3ns 100Hz, 200Hz, 1kHz, 5kHz, 10kHz, 15kHz, 55kHz, 100kHz Passive
Bright Microlaser Microchip SB1 Laser SB1-236.5 Pulsed DPSS Lasers, Microchip Lasers 236.5 0.001 0.200, 2.0 2ns 500Hz, 5kHz Passive
Bright Microlaser Microchip SB1 Laser SB1-266 Pulsed DPSS Lasers, Microchip Lasers 266 0.002, 0.005 0.500, 1.0, 2.0 1.3ns 1kHz, 5kHz, 10kHz Passive
Bright Microlaser Microchip SB1 Laser SB1-355 Pulsed DPSS Lasers, Microchip Lasers 355 0.010 1.0 1.3ns 5kHz, 10kHz Passive
Bright Microlaser Microchip SB1 Laser SB1-473 Pulsed DPSS Lasers, Microchip Lasers 473 0.0009, 0.010, 0.015 1.0, 3.0, 9.0 2ns 100Hz, 5kHz, 10kHz Passive
Bright Microlaser Microchip SB1 Laser SB1-532 Pulsed DPSS Lasers, Microchip Lasers 532 0.004, 0.006, 0.010, 0.017, 0.020, 0.030, 0.040, 0.075, 0.100 0.300, 7.0, 10.0, 15.0, 20.0, 30.0, 40.0 400ps, 1.3ns 10Hz, 100Hz, 200Hz, 1kHz, 5kHz, 10kHz, 15kHz, 55kHz, 100kHz Passive
Bright Microlaser Microchip SB1 Laser SB1-946 Pulsed DPSS Lasers, Microchip Lasers 946 0.004, 0.060, 0.070, 0.105 7.0 2ns 100Hz, 5kHz, 10kHz Passive

Nps Series

Nps-1064-10

The new, ultrafast NPS Series features up to 10W average output power, <7ps pulse width, and a 40MHz repetition rate. The transform-limited operation, with a spectral width of < 0.3nm, and remarkably accurate central wavelength (1064.3 +/- 0.1nm) make the NPS Series a suitable candidate for highly efficient amplification by Nd-doped DPSS amplifiers. Therefore, opening the way to nonlinear optics applications like OPO pumping, and narrowband Raman Spectroscopy.

One Series

One-1030-100: 1030nm Miniature Q-Switched Laser

The One Series is a compact, passively q-switched laser operating at the fundamental wavelength of 1030nm. Available in a high energy configurations (up to 100uJ) as well as a high average power configurations (up to 3W). The One Series can be configured in a fixed operational rep rate configuration, or an externally triggerable configuration. The One series is utilized in a variety of applications spanning from material process to air-borne LiDAR.

OT Series

The OT series of Erbium Glass lasers are ultra-compact, high energy q-switched, solid-state lasers that are well suited for rugged, field applications such as active night vision and rangefinding. These air-cooled lasers are available in both lamp-pumped and diode-pumped configurations, with passive and active Q-switching options. With over 10,000 units in the field, the OT series is a proven technology operating in some of the more challenging laser environments.

Microchip Series

Bright Microlaser Microchip SB1 Laser

The Microchip Series, from BrightMicroLaser, are ultra-compact, passively q-switched, single longitudinal mode (SLM), narrow linewidth, DPSS lasers that feature pulse durations from 400 ps to 2 ns, energy levels up to 80 uJ and repetition rates up to 100 kHz. In addition to the fundamental 1064 nm wavelength and its harmonics (532, 355 and 266 nm), we also deliver units emitting at 946 and 473 nm.