Enhanced Transmission Mode Variable Attenuator, 780-820nm

Manfacturer's part number :


Produttore Altechna


Descrizione :

Enhanced Transmission Mode Variable Attenuator with a broadband range 780-820nm consists of 2 high-performance polarising optics components placed in precision opto-mechanical Holder 5APH79T-1. The variable attenuator/beamsplitter incorporates 2 high-performance Brewster type polarisers, which reflect s-polarised light while transmitting p-polarised light. These two Brewster type polarisers are housed in special design opto-mechanical adapter. The adapter allows to use either round shape either rectangular shape Brewster type polarisers as well. A rotating quartz Phase λ/2 Waveplate is placed in the incident polarised laser beam. The intensity ratio of those two beams may be continuously varied without alteration of other beam parameters by rotating the waveplate. The intensity of either exit beam, or their intensity ratio, can be controlled over a wide dynamic range. P-polarization could be selected for maximum transmission, or high-purity s-polarization could be reflected when maximum attenuation of the transmitted beam takes place.

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  • Operational wavelength: 780nm to 820nm, Transmission mode: ±5 nm
  • Clear Aperture: 15 mm (up to 50 mm available)
  • Time dispersion: t<4 fs for 100 fs Ti:Sapphire laser pulses
  • Broad-band reflection mode: λ/2 Zero Order Waveplate + 1x Brewster type thin
  • Extinction ratio: Ts/Tp< 1:500
  • Broad-band reflection mode: 0.5 - 98% for reflected s-pol beam
  • Damage threshold: >5 J/cm²; >100 mJ/cm²@100fs, 10 Hz, 800 nm
  • Benefits

  • Ideal for femtosecond applications
  • Divides laser beam into two parallel beams of manually adjustable intensity ratio
  • Large dynamic range
  • Negligible beam deviation
  • High Optical damage threshold
  • Low dispersion for femtosecond and high energy laser pulses