Laser power/energy 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.

Download product datasheet

Get all details about product

Attenuators technical details

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.








Design wavelength

1064 nm

532 nm

355 nm

266 nm

213 nm

Typical max transmission 2)






Typical min transmission 2)



Input polarization


Output polarization 3)

linear, horizontal

linear, rotating


<0.15 %


±0.5 %

Clear aperture

6 mm

Stepper motor

12800 steps /360 deg, 4-phase, 1A

Dimensions ( W×L×H)

54 × 43 × 77 mm3


<0.4 kg

  1. Due to continuous improvements all specifications are subject to change. Unless stated otherwise all specifications are measured at fundamental wavelength and maximum pulse repetition rate. The parameters marked typical are not specifications. They are indications of typical performance and will vary with each unit we manufacture.
  2. Factory-set pulse repetition rate is fixed at max repetition rate shown in the table. Smoothly variable pulse repetition rate is possible when laser is externally triggered. In internal triggering mode repetition rate can be divided by integer number down to f/2, f/3, f/4,.. 1 Hz.
  3. At FWHM level at fundamental wavelength, measured with 350 ps rise time photodiode.
  4. Pulse energies for harmonic wavelengths are maximum possible values available from H1 series harmonic generator module. See datasheets of H1 for details.
  5. Measured during 30 seconds operation after warm-up.
  6. Over 8 hour period after 20 minutes of warm-up when ambient temperature variation is less than ±2 °C.
  7. Full angle measured at the 4σ level.
  8. Peak to peak value, measured for 30 seconds of operation after laser warm-up.
  9. Beam diameter is measured 20 cm from laser output at the 4σ level.
  10. In respect to falling edge of pump diode triggering pulse.
  11. Motorized attenuator intended to be attached to the laser housing. Transmission can be changed remotely trough laser web-server control interface.
  12. Power adapter dimensions might differ from indicated here, depending on model.
  13. Q1 laser is compatible all models of stand-alone H1 harmonics generator. Please refer to harmonic generator datasheets for detailed specifications.
  14. Laser can be powered from appropriate 12 VDC power source. Please inquire for details.