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All Products / Optics / Optical Filters / Longpass Filters / Dichroic Longpass Filters
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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

850nm, 25.2 x 35.6mm, Dichroic Longpass Filter

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Stock #69-906 In Stock
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€180,00
Qty 1-5
€180,00
Qty 6+
€144,00
Volume Pricing
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Specifications

General

Type:
Dichroic Filter

Physical & Mechanical Properties

Dimensions (mm):
25.2 x 35.6
Length (mm):
35.60
Thickness (mm):
1.05
Thickness Tolerance (mm):
±0.1
Width (mm):
25.20
Dimensional Tolerance (mm):
+0.0/-0.2
Physical Durability:
Adhesion per MIL-PRF-13830B, Section C.4.5.12
Moderate abrasion per MIL-PRF-13830B, Section C.4.5.11
Cleaning per MIL-C-48497A Section 4.5.4.2

Optical Properties

Angle of Incidence (°):
45
Cut-On Wavelength (nm):
850.00
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Fused Silica (Corning 7980)
Coating:
Hard Coated
Reflection (%):
>97, Average Polarization
>95, Absolute Polarization
Reflection Wavelength (nm):
635 - 805
Surface Quality:
60-40
Transmission (%):
>85, Average Polarization
>80, Absolute Polarization
Transmission Wavelength (nm):
880 - 1600
Transmitted Wavefront Tolerance:
λ/4
Cut-On Tolerance (%):
±2
Slope Factor (%):
3.00
Wavelength Range (nm):
635 - 1600
Wavelength Range (μm):
0.635 - 1.6

Environmental & Durability Factors

Environmental Durability:
Humidity per MIL-STD-810H, Section 507.6
Temperature per MIL-STD-810H, Section 501.7 and 502.7

Regulatory Compliance

RoHS 2015:
Compliant
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Certificate of Conformance:
View
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Reach 242:
Compliant
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Product Details

  • Ideal for Fluorescence or Multispectral Imaging
  • Sharp Cut-On Wavelength
  • Broad Transmission and Reflection Ranges

Our TECHSPEC® Dichroic Longpass Filters are designed for a 45° angle of incidence. The rejected light is reflected at 90°, making these filters ideal for use in fluorescence applications or as spectral beamsplitters. These hard coated filters feature low polarization dependence, broad spectral ranges, and a precision fused silica substrate. Reflection and transmission curves are available to easily integrate TECHSPEC® Dichroic Longpass Filters into any application.

Note: The chevron on the edge of the filter points towards surface S1 with the primary filter coating on which the light should be incident.

Hard coatings are used to increase durability while maintaining performance. The hard coating provides Dichroic Longpass Filters with high resistance to humidity, temperature, and abrasion, while also reducing the risk of damage when being handled.

Technical Information

Filter Type Transmitted Wavefront (RMS) Surface Quality Surface Flatness
(P-V)		 R(avg) T(avg)
HP Dichroic λ/10 40-20 λ/2 >98% >90%
Fluorescence Dichroics 1λ 60-40 - >98% >90%
Dichroic Longpass λ/4 40-20 - >97% >85%

Accessories

Title CompareStock Number  Price Buy
400 - 750nm, 25mm Dia., Dichroic Longpass Filter Kit (8 Filters) #15-102 €1.270,00   Request Quote
  • Contact Us
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800 - 1200nm, 25mm Dia., Dichroic Longpass Filter Kit (9 Filters) #15-103 €1.385,00   Request Quote
  • 3-4 days
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400 - 750nm, 25.2 x 35.6mm, Dichroic Longpass Filter Kit (8 Filters) #15-104 €1.270,00   Request Quote
  • Contact Us
    ×
800 - 1200nm, 25.2 x 35.6mm, Dichroic Longpass Filter Kit (9 Filters) #15-105 €1.385,00   Request Quote
  • Contact Us
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Custom

Edmund Optics offers comprehensive custom manufacturing services for optical and imaging components tailored to your specific application requirements. Whether in the prototyping phase or preparing for full-scale production, we provide flexible solutions to meet your needs. Our experienced engineers are here to assist—from concept to completion.

Our capabilities include:

  • Custom dimensions, materials, coatings, and more
  • High-precision surface quality and flatness
  • Tight tolerances and complex geometries
  • Scalable production—from prototype to volume

Learn more about our custom manufacturing capabilities or submit an inquiry here.

Frequently Purchased Together

Compatible Mounts

Title  Type Compare Stock Number   Price  Buy
15mm Sq., Fixed Filter Holder Fixed #54-996 €63,00
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Filter Kinematic Mount, 2-Screw Adjustable - Tip-Tilt #58-874 €118,00
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60mm sq - Rectangular Bar Clamp Fixed #54-995 €118,00
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Filter Kinematic Mount, 3-Screw Adjustable - Tip-Tilt #58-875 €128,00
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  • 3-4 days
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