What are DICHROICS?
Dichroic filters, also known as dichroic mirrors, are specialized optical filters that selectively transmit light of certain wavelengths while reflecting others. They are designed to work at specific angles of incidence, typically at 45 degrees.
Commonly used in fluorescence systems and in custom solutions we design for high-volume production and delivery to our customers.
Types of Custom Omega Optical Dichroics
Longpass Dichroic Filters
Longpass dichroics transmit wavelengths above a certain wavelength. This wavelength is called a cut-on wavelength for longpass filters. LP dichroics can be used instead of bandpass filters in fluorescence applications to maximize signal when using a single fluorescent label, or to block the laser in Raman applications.
Shortpass Dichroics
Shortpass dichroic filters transmit wavelengths below a certain wavelength. This wavelength is called a cutoff wavelength for shortpass filters. SP dichroics are often used in digital cameras to block undesired near-infrared (NIR) signals from reaching the camera.
Multi-band Combinations
Multi-band filters and dichroics are used when an optical system design cannot support multiple filters. These multi-band filters can be configured as bandpass or notch (band-reject) for desired ranges, and in dual, triple, quad, penta or even octo-band.
UV Dichroic Filters
Omega routinely produces filters which selectively transmit or reject wavelength bands of less than 1nm and even less than 0.1nm
Dichroics on Fiber Tips
In applications which demand spectral selectivity on the entrance or exit of a fiber, Omega has a solution to deposit one or more filter recipes to a fiber (or fiber bundle).
Plate Beamsplitters
Patterned filters are useful in applications where lateral space constraints require discrete wavelength selection. This is often the case with Earth Observation filters.