OA. Optical Attenuators
|Dynamic attenuation range||>102|
|Input pulse duration||less than 50 fs||>50 fs||>50 fs|
|Central wavelength* (fixed)||250-2000 nm|
|Bandwidth** (% of central wavelength)||7-8%||10-15%||15-20%|
|Clear aperture||<10 mm||<6 mm||<10 mm||<16 mm||<15 mm|
|Beam deflection||40 mm (walk-off)||<1 mrad||<1 mrad|
|Damage threshold||10 J/cm2||5 J/cm2||2 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;
** - 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.
Avesta is participating in LASER World of Photonics China (March 20-22, 2019, Shanghai), our location is Hall W3, booth #3173. Feel free to drop by to discuss any ongoing and potential cases, new products and latest development efforts.
Avesta team will be on the New Year and Orthodox Christmas break from 30 Dec 2018 till 08 Jan 2019. The last working day is 29 Dec 2018 (Sat) and the first working day in 2019 is 09 Jan 2019 (Wed). Happy holidays!