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Bandpass Filters for Biophotonics

Steep Edge Bandpass Filters for Fluorescence and Raman Detection

Materion Balzers Optics bandpass filters excel by steep transition between blockband and passband and high passband transmittance. The all-dielectric interference filters are deposited by plasmaassisted processes and show extreme environmental stability. Our sophisticated filter designs are optimized according to the requirements of the application.

Steep Edge Bandpass Filters for Fluorescence and Raman Detection

Benefits

Sharp separation between blockband and passband
High transmittance > 90% outside the blockband
Long-term shift-free spectral performance
High environmental stability
Wide flexibility in filter size

Applications

Fluorescence detection
Raman spectroscopy
Excitation filters for LED and lasers

Technical Data

Passband wavelength

240 – 2000 nm

Blocking

OD5 to OD6, depending on requirements

Transmittance

> 90 – 95% outside blockband

Angle of incidence

Standard 0°, different AOI on request

Substrate material

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 0.16

Environmental stability

Temperature –40 °C to +300 °C
Humidity up to 99%

Bandpass Filters

All-dielectric bandpassfilter for the VIS range with OD5 blocking, Fig.1: Measured spectral transmittance, passband

Fig.1: Measured spectral transmittance, passband

All-dielectric bandpassfilter for the VIS range with OD5 blocking, Fig.2: Measured spectral transmittance, blockband

Fig.2: Measured spectral transmittance, blockband

Shortpass 400 nm with OD5 blocking,

Fig. 3: Measured spectral transmittance

Multi-Bandpass 420 – 475 / 500 – 610 nm,

Fig. 4: Measured spectral transmittance, OD 5 blocking for 350–410, 488, 630–800 nm

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