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||<10 mm||<16 mm||<16 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;
* - 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) or step-motor driven (-S) modification with a USB interface and a controller with Windows PC software.
Avesta is participating in Ultrafast Phenomena 2018 conference and tabletop exhibition in Hamburg, Germany (15-20 July). We would be glad to discuss any of the ongoing and future projects with the ultrafast community at our tabletop. Hope to see you soon!
Avesta’s facilities will be closed for the New Year break from 30 Dec 2017 till 08 Jan 2018. We will resume all operations on 09 Jan 2018. However, we hope to provide periodic e-mail correspondence during the holidays. We wish you a fruitful and prosperous Year 2018!