OA. Optical Attenuators
|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%|
|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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