Filters

Optosigma Filters select specific wavelength ranges for laser systems, spectroscopy, imaging, and fluorescence microscopy. Available types span interference filters (hard-coated) and colored glass filters in standard and custom dimensions.

Filter types from Optosigma:
– Longpass filters: transmit wavelengths above the cut-on; used to block laser excitation in fluorescence and Raman
– Shortpass filters: transmit wavelengths below the cut-off; used to block IR in imaging systems
– Bandpass filters: transmit a defined wavelength band; available as narrow (less than 10 nm FWHM) and broadband versions
– Neutral density (ND) filters: uniform attenuation across visible spectrum; available in OD 0.1 to 4.0; used for laser power control
– Notch filters: block a narrow laser line while transmitting surrounding wavelengths; used in Raman spectroscopy
– Laser line filters: narrow bandpass centered on laser emission lines (405, 488, 532, 633, 785 nm and others)

All interference filters feature hard-coated dielectric stacks on glass substrates; performance is angle-sensitive. Colored glass filters provide stable, angle-insensitive attenuation over broad spectral ranges.

NewRoad provides Optosigma filters in Israel for spectroscopy, laser power control, fluorescence microscopy, and imaging instrumentation.