Q2-HE Series - Q-switched Air-Cooled High Energy Lasers

Q2-HE air-cooled, Q-switched, diode pumped lasers are designed for applications that require high peak power. Due to the short laser cavity and good thermal properties, the laser delivers up to 100 mJ at < 6 - 7 ns and repetition rates up to 100 Hz. This laser is an ideal and robust tool for applications like Laser Induced Breakdown Spectroscopy (LIBS), remote sensing or laser ablation.

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  • Up to 100 mJ pulse energy, up to 4 W average power.
  • 1053 or 1064 nm output wavelength.
  • Air cooled (water-free).
  • Up to 100 Hz pulse repetition rate.
  • Smoothly variable pulse repetition rate for 1053 nm output wavelength models.
  • >2 Gshot lifetime of pump diodes.
  • Built-in sync pulse generator for triggering of user equipment.
  • Remote monitoring and control via built-in Ethernet interface.
  • Optional attachable 2nd harmonic generator.
  • Optional 2nd, 3rd, 4th or 5th stand-alone harmonic generator.
  • Optional attachable attenuator for fundamental wavelength.
  • Optional attachable pulse energy monitor.


  • Laser Induced Breakdown Spectroscopy (LIBS)
  • OPO, dye laser, Ti:sapphire pumping
  • Remote sensing
  • Laser ablation
  • Time-of-Flight Spectroscopy (TOFS)
  • Light Induced Fluorescence Spectroscopy (LIF)
  • Flash photolysis
  • Matrix Assisted Laser Desorption / Ionization (MALDI)
  • Pulsed Light Deposition (PLD)

Quantum Light Instruments Ltd. innovative water-free laser crystal cooling technology enables generation of high quality laser beam with up to 100 mJ pulse energy and/or up to 4 W average output power.
Q2HE series sets new standard in Q-switched laser market. Advanced laser design resulted in compact, user-friendly turnkey system that requires little maintenance. There is no chillers or bulky power supplies that one needs fit under the table. Most of laser electronics is integrated into housing of the Q2HE and the only external modules are compact controller box and mains adapter that provides 27 VDC, 50-150 W power (depending on model).
Less than 7 ns pulse duration and low divergence of the beam enables efficient fundamental wavelength conversion to higher harmonics with shortest wavelength available of 211 nm.
Low jitter triggering pulses for user equipment are available in internal triggering mode. If required, laser pulsing can be externally triggered from delay generator.
Laser is controlled trough Ethernet port via build-in web-server. There is no need to install control software – any computer or even cell phone with modern web-browser installed will be able to control Q2HE. API is provided for integration with user devices.

Model 1) Q2-HE-D20 Q2-HE-D50 Q2-HE-D100 Q2-HE-E20 Q2-HE-E50 Q2-HE-F10 Q2-HE-F20
Pulse energy 40 mJ 70 mJ 100 mJ
Wavelength 1064 nm 1053 nm
Pulse duration < 7 ns < 6 ns
Repetition rate 20 Hz 50 Hz 100 Hz 20 Hz 50 Hz 10 Hz 20 Hz
Beam profile > 75 % fit to Gaussian
Pulse energy stability (RMS) < 0.5 %
Optional harmonics generator
Pulse energy
    at 526.5 / 532 nm 20 mJ 35 mJ 50 mJ
    at 351 / 355 nm 12 mJ 20 mJ 30 mJ
    at 263 / 266 nm 5 mJ 10 mJ 15 mJ
    at 211 / 213 nm 1.5 mJ 3 mJ 6 mJ
Optional attenuator
Transmission range 1 - 95 %

More detailed specifications are given in the data sheet.

Harmonic generator SHG

  • Compact attachable 2nd harmonic generator compatible with Q2 and Q2HE series lasers.
  • Factory-configurable two exit ports.
  • Microprocessor controlled temperature tuned nonlinear crystal.
  • Remote monitoring and control via common with laser Ethernet interface.
  • Optional attachable pulse energy monitor.

SHG is compact second harmonic generator module is designed to be attached to our Q2 or Q2HE series lasers.

SHG has two exit ports that can be factory-configured in several ways. Standard configurations are listed in the table below. Second harmonic beam can be configured to be coaxial with fundamental beam (SHG-0 option) or can be separated from fundamental by build-in dichroic mirrors (SHG-1 and SHG-2 options).

When supplied together with Q2/Q2HE series laser, status of SHG can be remotely monitored and controlled from laser control panel (PC is required). Our pulse energy monitor of EM series can be attached to the exit port with digital or analog readout of pulse energy value.

Most of high performance birefringent crystals are hygroscopic, which might limit their lifetime in humid environment. However, if they are continuously kept at higher than ambient temperatures, the lifetime of crystals can be significantly extended and can be even longer than laser system itself. To keep crystals dry, SHG module needs to be always connected to the laser controller. If powering is not available, the module should be stored in dry environment.

Model SHG
Conversion efficiency > 50 %
Pulse duration 10 - 20 % shorter than fundamental

For more details, please concact us.


Harmonic generator H-SMART

  • Stand-alone 2nd, 3rd, 4th or 5th harmonic generator compatible with Q2 and Q2HE series lasers.
  • Microprocessor controlled temperature tuned nonlinear crystals.
  • Factory-configurable up to three exit ports.
  • Self-tuning of crystals for maximum pulse energy.
  • Build-in bypass and/or attenuator of fundamental beam (for some models).
  • Remote monitoring and control via common with laser or separate Ethernet interface.
  • Optional enhanced spectral purity of UV wavelengths.
  • Optional build-in or attachable motorized attenuator.
  • Optional build-in or attachable pulse energy monitor.
  • Optional fiber coupled output.
  • Optional air purging for improved lifetime of UV harmonic crystals and optics.

H-SMART is stand-alone automated harmonic generator module designed to be used with our Q2 and Q2HE series lasers. Module is intended to be mounted side-by-side with laser on common optical table or breadboard.
H-SMART has three exit ports that can be factory-configured to emit up to 5th harmonic wavelengths. Most common exit port standard configurations are listed in the “Exit port configuration options” table below. Custom configurations are available by request.

Conversion efficiency
    2nd harmonic > 50 %
    3rd harmonic > 30 %
    4th harmonic > 15 %
    5th harmonic > 15 %

For more details, please see our data sheet.


Motorized attenuators

  • Drop-in attachable to the laser body attenuators for 1st, 2nd, 3rd, 4th or 5th harmonics of Nd:YAG or Nd:YLF lasers.
  • Up to 98% maximum transmission.
  • Precise transmission control by stepper motor in microstepping mode (12800 steps/rotation).
  • Transmission adjustment accuracy <0.15%.
  • Remote control via common with laser Ethernet interface.
  • Optional stand-alone version for mounting on optical table.
  • Optional side port transforms attenuator to variable beam splitter.

Pulse energy of our Q-switched lasers can be conveniently lowered from maximum value by reducing current of pump diode. When less pump light is stored in lasing media, laser emits pulses with lower energy.

Above described method of pulse energy attenuation has its pros and cons. It is cost-effective, simple to implement, however, pulse energy change affects also other important laser beam parameters like pulse-to-pulse stability, beam divergence, pulse duration. For example, pulse-to-pulse energy stability of harmonics wavelengths might be more than 2 times worse at lower than nominal fundamental pulse energy.

AT series attenuators allows to attenuate laser pulse energy without changes in beam parameters.Attenuator consist of polarizer and waveplate. By changing of input beam polarization, transmission of beam can be changed for maximum to minimum value. Minimum transmission value depends on input beam polarization state and polarizer extinction ratio and typically is approx. 1 %.

Maximum possible transmission is determined by reflection and absorption losses of optical components. Several attenuators can be used in series if larger dynamic range is required. Attenuator transmission can be controlled trough common with laser Ethernet interface. API is provided for integration into user software.

Model AT1 AT2 AT3 AT4 AT5
Wavelength 1064 nm 532 nm 355 nm 266 nm 213 nm
Max transmission 98 % 95 % 90 % 75 % 65 %
Min transmission 1 % 0.5 %

For more details, please see our data sheet.


Attachable pulse energy monitor

For more details, please see our data sheet.

Do you have questions about Q2-HE?

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Give us a call | +49 6151 425978

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Do you have questions about our products?

Write to us | info@topag.de

Give us a call | +49 6151 425978

TOPAG Lasertechnik GmbH
Nieder-Ramstädter Str. 247
64285 Darmstadt, Germany
Phone: +49 6151 4259 78
Fax: +49 6151 4259 88
E-mail: info@topag.de