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Delta Optical Thin-Film Linear Variable Filter Used in new Laser Attenuator

A new laser attenuator has been developed, which utilizes an ultra-hard coated, laser optical multilayer attenuator (LOMA) filter from Delta Optical Thin Film

The laser attenuator enables computer-controlled attenuation of a monochromatic light source. It provides the user with safe, repeatable, real-time control over the attenuation by combining the LOMA filter with a linear drive, controlled electronics and dedicated software.

Product specifications of the laser attenuator

  • USB-controlled
  • Small design (173 x 109 x 35 mm³; 400 g)
  • Laser attenuation range: 1% to 99%
  • No pulse broadening, even with femtosecond lasers
  • High laser damage threshold
  • Durable filter and robust shell

Ultrahard coated, linear variable filter

Delta Optical Thin Film linear variable filters are constructed from wedged optical thin-film coatings that have spectral properties that vary nearly linearly across the length of the filter. The position of the edge of the wavelength can be adjusted by sliding the filter with respect to incident light, and this enables control of the intensity or power of the transmitted laser beam. 

The LOMA filter used in the laser attenuator uses a customized version of the standard Delta Optical Thing Film linear variable filters. The design of the LOMA filter has a gradual edge between full transmission and full attenuation. 

This filter is based on an optical thin-film coating that works on reflection, unlike other filters that work on absorption. This feature allows the LOMA filters to withstand high laser power, as it attenuates the laser with no absorption of the input power. 

The laser beam is transmitted without distortion of the beam profile, and no extra optics are required. No pulse broadening is observed, even with short laser pulses down to 70 fs. The optical coating works independently of polarization, and it is designed for a wide range of laser wavelengths between 550 and 1000 nm.

Any rejected power is dumped within the unit, and the LOMA is contained within a compact housing equipped with adjustable mountings, which are easy to operate. 

The development of the laser attenuator was a result of the successful completion of the Eurostars Optitune program between Edinburgh Biosciences and Delta Optical Thin Film.

Labels: Delta Optical Thin-Film,Laser Attenuator,Laser Optical Multilayer Attenuator,LOMA filter

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