Materion Balzers Optics
  1. Home
  2. DatasheetsNew
  3. OBJ
  4. MJO 016 PE

High Precision Order Sorting Filters

High-order suppression in grating-based optical systems

Grating-based optical instruments play a crucial role in a vast range of optical systems. However, the use of diffraction gratings introduces higher diffraction orders that must be addressed. One method to suppress these orders is through a strategic placement of several longpass filters. These filters must have a highly transmitting passband, along with an efficient suppression in the blocking band. Using photolithography, multiple filters with a transition zone of less than 10 μm can be patterned on a single substrate. Additionally, linear variable filters are available for integration into high-end spectrometers. On request, all order sorting filters may be combined with the renowned GelotTM coating for hermitically sealing the detector.

High-order suppression in grating-based optical systems

Benefits

  • Customized filter size and design
  • Entirely coated, patterned or linear variable filters
  • High transmittance in the passband
  • Long-term shift-free spectral performance
  • Extreme environmental stability
  • Compact and cost-effective configuration
  • Enables instrument designs with no moving parts for fastest data acquisition


Applications

  • «Grating-based» optical devices, e.g. miniature spectrometers
  • Sensing, metrology, astronomy

Technical Data

Wavelength available from UV to NIR range
(e.g. 260nm, 380nm, 605nm, 900nm)
or as a continuously variable version (LVF)

Blocking OD3 – OD8

Transmittance Tave >95%
(depending on wavelenght range)

Dimensions per customer request

Parallelism <3 arcmin

Surface Defects e.g. 5/1 x 0.1 per ISO 10110-7
or 20-10 per ML-PRF-13830B

Environmental Stability Temperature -100 ... +150°C
Humidity up to 99%

Transition zone <10µm (conventional OSF)
None (Linear variable Filter)

Application Spectroscopy
Application Spectroscopy
Fig. 1: Using a lithographic approach, a transition region < 10 µm can be achieved between different zones.
Fig. 1: Using a lithographic approach, a transition region < 10 µm can be achieved between different zones.
Fig. 2: On request, all filters may be combined with our solderable GelotTM coating for hermetically sealing the detector.
Fig. 2: On request, all filters may be combined with our solderable GelotTM coating for hermetically sealing the detector.
Fig.3: Using a linear variable filter (LVF) instead of a traditional multi-zone filter allows to get rid of all transition regions as the spectral performance varies continuously depending on the lateral position on the filter.
Fig.3: Using a linear variable filter (LVF) instead of a traditional multi-zone filter allows to get rid of all transition regions as the spectral performance varies continuously depending on the lateral position on the filter.
Fig. 4: Measured spectral transmittance of a VIS-Order Sorting Filter with broad transmission bands. Inset: the blocking power is OD4.
Fig. 4: Measured spectral transmittance of a VIS-Order Sorting Filter with broad transmission bands. Inset: the blocking power is OD4.
Fig. 5: Measured spectral transmittance of a NIR-Order Sorting Filter. Inset: blocking performance.
Fig. 5: Measured spectral transmittance of a NIR-Order Sorting Filter. Inset: blocking performance.
Fig. 6: The spectral performance of an LVF depends linearly on the measurement position.
Fig. 6: The spectral performance of an LVF depends linearly on the measurement position.
> PDF Download