Dichroic Filters

Dichroic filters, also known as thin-film or interference filters, are specialized optical components designed to selectively transmit light within a specific wavelength range while reflecting others. These filters are typically manufactured using glass substrates and are set at a 45-degree angle to the light source, allowing precise control over transmitted and reflected wavelengths. For example, a red filter transmits red light and reflects cyan, while a green filter transmits green and reflects magenta. Dichroic filters are often used in color separation for red, green, and blue (RGB) systems, ensuring highly saturated output for applications like imaging and projection.

At Avantier, we create custom dichroic filters including longpass, shortpass, bandpass, bandblocking, and color correction options. Our filters have the dichroic color integrated into the structure, ensuring durability and extending operational life compared to conventional filters. Additionally, our dichroic filters are designed to withstand high power optical systems with a high laser damage threshold, making them ideal for demanding environments.

Applications of Dichroic Filters

Dichroic filters play a vital role in various applications, including:

LCD projectors
Laser harmonic separation
Fluorescence microscopy
Multispectral imaging
UV water purification monitoring

In systems requiring color separation, such as projectors or imaging devices, these filters effectively control RGB light. Variants like cold and hot mirrors, which are also based on dichroic principles, aid in high power heat management by reflecting visible light and allowing infrared light to pass or vice versa.

Features of Avantier’s Dichroic Filters

Sharp transition from reflection to transmission
High transmission in the pass band
Hard coatings with no adhesives for long filter life
All dielectric coatings using advanced vacuum deposition methods
Durable design for high-power applications

Our dichroic filters are crafted from UV-grade glass substrates using vacuum deposition techniques, ensuring a highly durable, abrasion-resistant coating. These filters can operate in temperatures from -45°C to 85°C, with standard dimensions of 25.2 mm by 35.6 mm and a thickness tolerance of ±0.1 mm.

Factory Standard

Angle of Incidence	45.0°
Substrate	UV Grade Fused Silica
Surface Quality	60-40
Thickness Tolerance	±0.1 mm
Shortpass Type Transmittance	Tabs>85%
Longpass Type Transmittance	Tabs>90%
Reflection Band	Rabs>98%
Dimensions	25.2mm x 35.6mm x 1.1 mm
Clear Aperture	>95%
Operating Temperature	-45°C ~ 85°C
Transmitted Wavefront	1/4λ RMS@633nm (per inch)
Environmental Durability	MIL-STD-810F
Physical Durability	MIL-C-48497A

Dichroic Longpass Filters

Cut-off Wavelength(nm)	Reflection Band(nm)	Transmission Band(nm)	Size(mm)
411	344-404	415-570	25.2 x 35.6 x 1.1
458	426-450	467-600	25.2 x 35.6 x 1.2
497	442-488	502-730	25.2 x 35.6 x 1.3
508	446-500	513-725	25.2 x 35.6 x 1.4
520	488-512	528-655	25.2 x 35.6 x 1.5
555	493-548	562-745	25.2 x 35.6 x 1.6
565	499-555	569-730	25.2 x 35.6 x 1.7
595	530-585	601-800	25.2 x 35.6 x 1.8
655	470-645	665-726	25.2 x 35.6 x 1.9
660	594-651	669-726	25.2 x 35.6 x 1.10
665	350-650	680-1100	25.2 x 35.6 x 1.11
669	350-660	677-800	25.2 x 35.6 x 1.12
735	350-720	750-1100	25.2 x 35.6 x 1.13
740	480-720	750-825	25.2 x 35.6 x 1.14

Dichroic Shortpass Filters

Cut-off Wavelength(nm)	Reflection Band(nm)	Transmission Band(nm)	Size(mm)
550	400-548	575-725	25.2 x 35.6 x 1.1
600	400-580	625-795	25.2 x 35.6 x 1.2
700	400-680	725-900	25.2 x 35.6 x 1.3
750	400-725	800-990	25.2 x 35.6 x 1.4
800	400-775	850-1050	25.2 x 35.6 x 1.5
850	400-820	910-1110	25.2 x 35.6 x 1.6
900	425-865	960-1170	25.2 x 35.6 x 1.7
950	450-910	1025-1235	25.2 x 35.6 x 1.8
1000	465-940	1085-1305	25.2 x 35.6 x 1.9
1050	485-1000	1130-1370	25.2 x 35.6 x 1.10

Custom Dichroic Filters

If your project requires a unique optical solution, Avantier offers custom dichroic filters tailored to your specific needs. From glass substrates to precise color separation requirements, our expert team will guide you through the design, prototyping, and production stages. We ensure that your custom filters are optimized for transmitted and reflected wavelengths and are tailored for high-power optical systems. Please contact us to schedule a free consultation or request a quote for your next project.

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