Fluorescence Filter

Excitation filters (Exciting Filter, Exciter Filter, Excitation Filter): in fluorescence microscopes, filters that allow only the wavelength that excites fluorescence to pass. In the past, short-wave-pass filters were used; now bandpass filters are basically used. An arrow is engraved on the housing to indicate the recommended light propagation direction. Emission filters (Emitting Filter, Emission Filter, Barrier Filter, Emitter): select and transmit the fluorescence emitted by the sample, cutting off light of other ranges. The wavelength of emitted light is longer than that of excitation light (closer to red). Bandpass filters or long-wave-pass filters can be selected as emission filters. An arrow is engraved on the housing to indicate the recommended light propagation direction. Dichroic mirrors (Dichroic Mirror, Dichroic Beamsplitter, Dichromatic Beamsplitter): also called dichroic filters or color-splitting mirrors. Placed at a 45° angle to the optical path of the microscope. This filter reflects one color of light (excitation light) and transmits another color of light (emission light), with excitation light reflectivity greater than 90% and emission light transmittance greater than 90%. The part of the spectrum that cannot be transmitted is reflected rather than absorbed. The colors of the filter under transmitted light and reflected light are complementary, hence the name dichroic filter. Our company stocks a batch of selected high-performance filters, very suitable for Raman spectroscopy applications, with wavelengths from 224 to 1319nm. With these filters, you can see extremely weak Raman signals very close to the laser line. This product series has the following features: deep blocking of the laser line, ultra-low-ripple passband, reliable hard coating technology, and high laser damage threshold.

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