Founded in 2014 in Vilnius, Lithuania, Quantum Light Instruments, Ltd. (QLI) is a leading developer and manufacturer of high-performance Diode-Pumped Solid-State (DPSS) nanosecond pulsed lasers. Our systems are engineered to meet the rigorous demands of scientific research, industrial integration, defense, and medical applications.
Advanced Technology and Versatility
We specialize in both actively and passively Q-switched lasers, utilizing Nd:YAG and Nd:YLF crystals powered by advanced end-pumping technology. Our systems deliver impressive performance, with pulse energies reaching up to 200 mJ and repetition rates ranging from 1–200 Hz to 1–100 kHz, depending on the specific model.
The "Water-Free" Advantage
One of QLI’s standout innovations is our fully air-cooled, "water-free" technology. By eliminating the need for external chillers, bulky power supplies, or complex water-cooling loops, we provide compact, single-box systems that are easy to integrate and maintain, even in space-constrained environments.
Customization and Precision
We offer a comprehensive suite of accessories, including harmonic generators (up to the 5th harmonic with up to three output ports), OPOs, Raman shifters, attenuators, energy monitors, and fiber-coupling modules. Our harmonic generation capabilities extend the laser output into the deep-UV spectrum, reaching 211–213 nm.
Innovation Through Collaboration
At QLI, we believe that true innovation begins with listening. Every customer request is an opportunity to refine our technology. Whether you require a standard compact laser for laboratory research or a custom high-energy system for industrial use, our team is dedicated to tailoring solutions that fit your exact requirements.

Q2 series diode pumped, fully air-cooled, Q-switched laser intended for wide range of applications that require high peak power pulses.
Our innovative water-free laser crystal end-pumping technology allows to produce Gaussian-like, low divergence laser beam. At the same time, Q2 is versatile platform that can be configured in many ways:
- Up to 80 mJ pulse energy and up to 2 W average power.
- Up to 100 Hz pulse repetition rate.
- 5-10 ns pulse duration.
- Optional <3 ns pulse duration at up to 40 mJ pulse energy (short cavity version).
- Optional motorized attenuator for fundamental wavelength beam.
- Pulse energy monitor with analog and/or digital output
- Weight < 9 kg incl. heatsink, controller & AC/DC adapter.
When used with the H-SMART stand-alone harmonic generator, the system can provide up to 3 separate ports with up to 5th harmonics at the output.
Optional air-purging unit can be added for long lifetime of UV optics.
Optional attachable 2nd harmonic generator can be used when system compact size is the highest priority.