OA. Optical Attenuators

Optical attenuators are used to attenuate laser radiation in a controlled manner. Models with thin-film polarizers, Glan prisms or polarizing beamsplitter cubes are available. The units are motorized or manually driven.
Dynamic attenuation range >102
Input pulse duration <50 fs >50 fs >70 fs
Central wavelength* (fixed) 800-1100** nm 350-2000 nm 343-350, 450-1600 nm
Bandwidth*** (% of central wavelength) 5% 10-12%
Transmission >92% >90% >85%
Clear aperture <10 mm <6 mm <10 mm <9 mm <15 mm
Beam deflection 40 mm (walk-off) <1 mrad
Damage threshold 10 J/cm2 5 J/cm2 10 J/cm2
Note: models with the "-S" index are driven by a step motor, transmission change for motorized models: 0.1% per step;
models with the "-М" index are manually driven; models with the "-MK"  index are manually driven and have additional side knob;
* - please specify a certain value from the given range with your request; usual wavelenths are 515, 800, 1030 nm;
** - order of thin-film polarizers for wavelengths of 250-800 nm is possible on request;
*** - depends on central wavelength.

The OA optical attenuator family is designed to attenuate laser radiation with more than 100:1 ratio. An optical attnuator unit features an optomechanical assembly with a zero-order half-wave plate that is being rotated and a system of polarizers. The type of the polarizers used depends on actual application: thin-film mirror polarizers for the OAFP model, Glan laser prisms for the OAGP model and polarizing beamsplitter cubes (PBS) for the OABS model.

The OAFP model comprises a thin zero-order half-wave phaseplate and two mirror polarizers that select the input pulse according to polarization.  This model has been specially developed for pulsed femtosecond radiation (<50 fs) as it introduces as little dispersion to the pulse as possible.

For longer pulse durations we offer the OAGP model, which has better transmission ratio as a Glan prism is used to simplify the scheme, or the OABS model that incorporates a PBS cube.

The attenuator comes in manual (-M/-MK) or step-motor driven (-S) modification with a USB interface and a controller with Windows PC software.

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