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Quantum Light Instruments (QLI), a laser technology innovator based in Lithuania, continues to redefine solid-state laser performance with its growing lineup of air-cooled, diode-pumped Q-switched lasers. Designed for precision applications such as LIBS, LiDAR, spectroscopy, photoacoustics, and micromachining, QLI systems are engineered for reliability, versatility, and ease of integration.

Compact, Water-Free Q-Switched Lasers for Demanding Tasks

At the core of QLI’s offerings are electro-optically (EO) Q-switched diode-pumped solid-state (DPSS) lasers that operate at low pulse repetition rates (up to 100 Hz) and moderate pulse energies (up to 120 mJ). These systems are fully air-cooled and maintenance-free - ideal for deployment in challenging environments where water cooling is impractical or unwanted.

The Q-Series of Q-Switched Lasers: Precision Engineering for Diverse Applications

Quantum Light Instruments’ Q-Series of Q-switched lasers delivers application-specific performance through meticulous design and cutting-edge technology:

• Q1: This compact, energy-efficient laser delivers up to 0.5 W average power, making it the perfect choice for space-constrained setups that demand high peak power pulses without sacrificing footprint.
• Q2 / Q2HE: These high-performance, air-cooled lasers provide up to 4 W average output power and pulse energies reaching 120 mJ. Featuring an innovative, proprietary water-free laser crystal cooling technology, they ensure robust, reliable operation in both field and laboratory environments, eliminating the complexity of water-cooling systems.
• Q-DOUBLE: Offering a unique dual-pulse output with variable temporal separation, the Q-DOUBLE laser is tailored for advanced measurement techniques such as Particle Image Velocimetry (PIV) and Laser-Induced Breakdown Spectroscopy (LIBS), enabling enhanced temporal resolution and data precision.
• Q-SHIFT: Equipped with an integrated nonlinear conversion stage, the Q-SHIFT series generates high-peak-power pulses at red, yellow, and blue wavelengths. This capability extends the operational range beyond what conventional diode-pumped solid-state (DPSS) lasers can achieve, opening new avenues for specialized applications.
• Q-SPARK: Engineered for ultrafast performance, the Q-SPARK produces pulse durations shorter than 1.5 ns at 1064 nm, with optional outputs at 266 nm, 355 nm, and 532 nm. This makes it ideally suited for high-temporal-resolution measurements and precision materials processing tasks requiring fine spatial control.

Q-TUNE Series: Versatile Tunable OPO Lasers for Broad Wavelength Coverage

Expanding the flexibility and tunability of its laser offerings, QLI’s Q-TUNE series features a range of Optical Parametric Oscillator (OPO) lasers designed to meet demanding research and industrial needs:

• Q-TUNE: A compact, single-unit OPO laser delivering narrow-linewidth pulses tunable across an extensive wavelength range from 210 to 2300 nm, perfect for applications requiring precision spectral control.
• Q-TUNE-G: This high-peak-power tunable laser source, with pulse energies up to 12 mJ, is optimized for photoacoustic imaging, nonlinear spectroscopy, and metrology. It covers a tunability range from 340 to 2100 nm, enabling versatile use in biomedical and material science research.
• Q-TUNE-IR: Designed specifically for mid-infrared applications, including vibrational microscopy, remote sensing, and spectrophotometry, the Q-TUNE-IR delivers pulse energies up to 17 mJ within the 1380 to 4500 nm spectral window, addressing critical demands in chemical analysis and environmental monitoring.
• Q-TUNE-HR: With high repetition rates up to 100 kHz, the Q-TUNE-HR OPO laser operates in the 750 to 1800 nm range. This makes it ideally suited for advanced imaging techniques, micromachining, and time-resolved spectroscopy, providing high throughput without compromising spectral quality.

Essential Accessories for Seamless Integration

To complement its advanced laser portfolio, Quantum Light Instruments (QLI) offers a robust line of high-performance accessories designed to maximize laser functionality, simplify system integration, and ensure long-term reliability in demanding environments. These add-ons enable users to tailor their laser setup for specific experimental or industrial requirements with minimal downtime and optimal stability.

• Harmonics Generators: QLI’s standalone harmonics generation modules allow users to extend the fundamental infrared laser output into the ultraviolet and visible spectrum, up to the fifth harmonic. Featuring thermostabilized non-linear crystals, these modules maintain consistent phase matching over long operating periods, enabling reliable performance in high-precision applications such as UV spectroscopy, photolithography, and microelectronics processing.
• Motorized Attenuators: Designed for seamless attachment to QLI lasers, these motorized units provide precise and remote-controlled adjustment of laser intensity. Compatible across all harmonic wavelengths, they allow users to safely and accurately regulate power for sensitive procedures, from biological sample illumination to thin-film ablation, without compromising beam alignment or quality.
• Pulse Energy Monitors: QLI’s pulse energy monitors deliver real-time diagnostic data with sampling rates up to 100 Hz and resolution down to 12 bits. Integrated into the laser controller, these units offer both digital and analog outputs for easy connectivity with external systems. They enable accurate pulse-to-pulse energy tracking and long-term process stability in energy-sensitive applications such as quantitative spectroscopy and laser calibration setups.
• Fiber Couplers and Beam Expanders: These accessories allow flexible and precise beam delivery, with fiber core diameters ranging from 200 to 1200 µm and wavelength support from 210 to 2100 nm. Ideal for delivering laser output to confined or remote spaces, such as within microscopy systems or enclosed chambers, QLI’s couplers and expanders support customized optical layouts and user-defined configurations.
• Air Purging Systems: QLI’s closed-loop air purging units are engineered to eliminate moisture and airborne contaminants from optical paths, ensuring clean and stable beam propagation. Using two-stage air filtration and long-lifetime operation without service interruptions, these systems maintain cleanroom-grade conditions inside laser heads and beam paths, critical for maintaining beam quality in dusty, humid, or uncontrolled environments.

Built for Reliability and Scientific Precision

Every QLI laser is developed with application-specific needs in mind - balancing high pulse energy, narrow linewidth, and environmental resilience. With options ranging from compact single-mode systems to tunable OPOs covering the UV to mid-IR spectrum, QLI enables precise control for research, industry, and medical diagnostics alike.

Click here to learn more about QLI's design and manufacturing.