Longpass Dichroic Mirror Long Pass Dichroic Filter

A long-pass dichroic mirror is a versatile optical component that selectively reflects shorter wavelengths of light while transmitting longer wavelengths. This type of dichroic mirror is widely used in microscopy and spectroscopy applications that require the separation of wavelengths above and below a specific cutoff point.

 

Our 61000 long pass dichroic mirror provides optimal NIR wavelength separation in a compact package. With a sharp 1000nm cutoff, it reflects over 98% of light under 1000nm while transmitting over 90% above 1050nm. This enables complete isolation of short NIR excitation from long NIR emission wavelengths for your fluorescence microscopy and spectroscopy needs. Whether you need high blocking of excitation wavelengths or maximum emissions transmission, the 61000's precise cutoff placement and steep transition slope ensure minimal crossover. Its large clear aperture and uniform thin film coatings also guarantee excellent performance across your wide field of view. For unmatched NIR wavelength separation in a customizable mirror, explore UVWAVETEK's full selection of long-pass dichroics today.

 

Features

- Sharp cutoff at 1000nm to distinctly separate NIR excitation and emission wavelengths

- Reflects >98% of light under 1000nm, transmits >90% of light above 1050nm

- Steep transition slope for minimal crossover between reflection and transmission zones

- Customizable cutoff wavelength from 400-1100nm to optimize for specific fluorophores

- Large 25mm clear aperture for comprehensive field-of-view imaging

- Ultra-uniform thin film coatings for consistent performance across the aperture

- Works as a dichroic mirror in mirror cubes to isolate the excitation and emission of light

- Can also be used as laser beamsplitter, edge filter, or for spectral sorting

 

Parameters

Product Name	Longpass Dichroic Mirror 61000
Cutoff Wavelength	1000nm
Transition Width	50nm
Reflection Band	400-1000nm
Average Reflectance in Reflection Band	>98%
Transmission Band	1050-1100nm
Average Transmittance in Transmission Band	>90%
Clear Aperture	25mm diameter
Slope	>2% per nm
Beam Deviation	<2 arcmin
Surface Quality	60-40 scratch-dig
Coating Uniformity	>97%
Angle of Incidence	45 degrees
Operating Temperature	-40 to 90℃
Coating Material	Dielectric thin films
Thickness	1.5mm
Diameter	1 inch
Substrate Material	N-BK7 Glass

 

Diagram

 

Applications

Here are some of the main applications and uses for long-pass dichroic mirrors like the Longpass Dichroic Mirror 61000:

- Fluorescence Microscopy:

Used in filter cubes to separate excitation and emission wavelengths. Allows imaging of specific fluorophores. Enables deeper tissue imaging with NIR excitation/emission.

- Multiphoton Microscopy:

Separates short NIR ultrashort pulse excitation from longer emission wavelengths. Essential for multiphoton fluorescence imaging.

- Spectroscopy:

Used to isolate or reject shorter wavelengths while transmitting longer wavelengths for analysis. Useful for absorbance, transmission, fluorescence, and Raman measurements.

- Laser Beamsplitting:

Splits a beam into reflection and transmission paths based on wavelength. Used to combine or split pump and signal beams.

- Wavelength Division Multiplexing:

Allows multiple channels of different wavelengths to be combined and separated. Used in telecommunications and networking applications.

 

What is the difference between dielectric and dichroic mirrors?

Dielectric and dichroic mirrors differ in their design and intended purpose.

Dielectric mirrors utilize stacks of transparent dielectric thin film coatings to achieve highly high reflectivity across a broad band of wavelengths. The layers create constructive interference at the desired wavelengths, reflecting over 99% of light at a zero-degree angle of incidence for both s and p polarizations. Dielectric mirrors are optimized as ultra-high reflectors with only small ripples in the reflection band.

 

Dichroic mirrors also employ dielectric coatings but are engineered to reflect specific wavelengths while transmitting others selectively. Their coatings are complex designs tailored to shape distinct reflection and transmission passbands. Dichroic mirrors operate at an angled incidence, usually 45 degrees, allowing them to split light into different directions based on wavelength. Their performance depends on polarization, and they can achieve steep transitions between reflection and transmission.

 

While both leverage dielectric thin films, dichroic mirrors have a different optical design focused on spectral filtering, beam splitting, and other wavelength-selective applications. Their purpose is not just to maximize reflectivity but to divide light precisely based on wavelength using their specialized angle-dependent coatings and passbands. This distinguishes them from the broadband high reflectors created with dielectric mirror coatings.

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