H1 is stand-alone harmonic generator module is designed to be used with our Q1 series lasers. Module is intended to be mounted side-by-side with Q1 laser on common optical table or breadboard.
H1 has two exit ports that can be factory-configured to emit up to 5th harmonic wavelengths. Most common standard configurations are listed in the table below.
Harmonic generation is a phase-sensitive process which requires phase matching to be efficient. Phase matching is possible in birefringent crystals, by finely tuning refractive indexes of interacting laser beams to required values. There are two ways to change refractive index of birefringent crystal: by changing its temperature or by changing incidence angle of laser beam.
In H1 modules phase matching of crystals is optimized by changing crystal temperature. Build-in microprocessor is used to fine tune and keep temperature stable. When supplied together with Q1 series laser, status of H1 can be remotely monitored and controlled from laser control panel (PC is required). Alternatively, control is possible directly via build-in Ethernet interface.
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, H1 module needs to be always connected to the power source. If power is not available, the module should be stored in dry place.

Module functionality can be further extended by auxiliary equipment:

Pulse energy of harmonic wavelength can be adjusted with our motorized attenuator. Models for up to 5th harmonic are available.
Pulse energy can be monitored by our attachable pulse energy monitor that can be attached directly to the harmonic generator or attenuator.
Fiber coupled output is available by request. Please inquire for detailed specifications.

Specifications 1)



Conversion efficiency 2)
Fundamental to second harmonic

> 50 %

Fundamental to third harmonic

> 30 %

Fundamental to fourth harmonic

> 15 %

Fundamental to fifth harmonic

> 6 %

Pulse to pulse energy stability @ 3)
526.5/532 nm

<2.5 % RMS

351/355 nm

<3.5 % RMS

263/266 nm

<4 % RMS

211/213 nm

<5 % RMS

Spectral purity for Port #1 4)


Typical pulse duration

10-20% shorter in each conversion stage

Typical beam diameter

10-30 % smaller than pump beam

Beam pointing stability

same as of pump beam

Harmonic generator (W×L×H)

110 × 242× 112 mm3

Operating requirements
Ambient temperature

15 – 30 ºC

Relative humidity

10 – 80 % (non-condensing)


12 VDC 5)

Average power consumption

<10 W

Configuration options


Port #1

Port #2

Wavelength 7)

Attenuator (optional) 8)

Energy monitor (optional) 9)




532 nm



1064 nm 10)


355 nm



532+1064 nm 11)


355 nm



532 nm 10)


266 nm



532+1064 nm 11)


266 nm12)





266 nm 12)



532 nm


213 nm 12)





213 nm 12)



532 nm

  1. Due to continuous improvements all specifications are subject to change. The parameters marked typical are not specifications. They are indications of typical performance and will vary with each unit we manufacture.
  2. Conversion efficiency presented here is for Port #1. Conversion efficiency at Port #2 depends on unit configuration and typically are lower than presented here. Please inquire for details.
  3. When unit is pumped by our Q1 series laser. Measured during 30 seconds operation after warm-up.
  4. Spectral purity at Port #2 could not be specified for two-wavelength output configuration.
  5. When supplied with Q1 laser, H1 is powered from laser controller.
  6. See Figure 1  below for port number assignment. Inquire for custom configurations.
  7. Wavelength is shown for 1064 nm pump wavelength. For 1053 nm pump wavelength recalculate wavelengths accordingly.
  8. Shows compatible attenuator model. This option is available only when H1 is supplied together with Q1 series laser.
  9. Shows compatible pulse energy monitor model. This option is available only when H1 is supplied together with Q1 series laser.
  10. Spectral purity is >98 %.
  11. Both wavelengths exit Port #2, for separation external dichroic mirror is required.
  12. Spectral purity for this model is >99.9%.



Figure 1. H1 harmonic generator port number assignment