Materion Balzers Optics
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Raman Filters

Optical Filters for Raman Spectroscopy

Materion Balzers Optics Raman filters are key components for highly sensitive Raman spectroscopy. Laser blocking filters (longpass, shortpass or notch), laser cleaning filters (narrow bandpass) and dichroic beamsplitters are available for all laser wavelengths between 260 and 1550 nm. The filter performance is realized by all-dielectric hard coatings deposited onto a single substrate. There is a high flexibility for the filter dimensions as required by compact optical set-ups.

Optical Filters for Raman Spectroscopy

Benefits

  • Low loss, flat transmittance range
  • OD5 to OD6 blocking
  • Steep pass-block transition
  • Long-term shift-free spectral performance
  • High environmental stability
  • Wide flexibility in filter size


Applications

  • Raman spectroscopy
  • Laser cleaning

Schematic Raman Spectrometer

Technical Data

Wavelength

λlaser = 260 ... 1550 nm

Laser Cleaning Filter

FWHM as low as 1.5 nm

TLaser > 90%

Broad band blocking OD5 to OD6

Edge Filter

Transition width OD6 – 50%T as low as 50 cm-1

Flat transmission range, T > 93%

Blocking of laser wavelength > OD6

Notch Filter

Transition width λlaser – 50%T as low as 180 cm-1

High transmission Taverage > 93%

Beamsplitter

Transition width 90%R – 90%T as low as 150 cm-1

Flat transmission range, T > 93%

RLaser > 90%

Angle of Incidence

0°/particular angle between 0° and 8°

45° unpolarized for beamsplitters

Substrate

fused silica or BK7

Dimensions

Standard size Ø 25 mm

Thickness 3 mm

Other dimensions on request

Parallelism

< 3 arcmin

Surface Defects

5 / 3 x 0.1

Environmental Stability

Temperature - 40 ... + 150 °C

Humidity up to 99%

Fig.1: Measured spectra for filter set 532 nm (left), blockband of laser cleaning filter (right).
Fig.1: Measured spectra for filter set 532 nm (left), blockband of laser cleaning filter (right).
Fig.2: Measured spectra of steep edge laser blocking filters, blocking of laser wavelength >OD6.
Fig.2: Measured spectra of steep edge laser blocking filters, blocking of laser wavelength >OD6.
Fig.3: Measured spectra of narrow band notch filters, blocking of laser wavelength >OD6.
Fig.3: Measured spectra of narrow band notch filters, blocking of laser wavelength >OD6.
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