Cold Mirror Filter For Laser Cooling

Cold mirror filters are specialized dielectric mirrors that transmit visible light while reflecting infrared radiation for applications requiring separating these spectral ranges. It relies on multi-layer coatings to efficiently filter out infrared wavelengths above a specified cut-on point for maximum visible light transmission with minimal loss or distortion. It has various applications, such as optical instruments, laser systems, or heat management in high-powered visual light sources.

 

We provide cold mirrors optimized for standard visible laser lines, including Argon (488 nm), HeNe (633 nm), and frequency-doubled YAG (532 nm). Over 95% transmission of your laser wavelength can be achieved with these mirrors. Our standard cold mirrors also offer broadly visible range transmission from 400-700 nm with cut-on points for infrared reflection at 700 nm, 800 nm, or higher as needed. For over 20 years, researchers have relied on our cold mirrors for high-quality, reliable performance in demanding visible laser and optics applications. We work with you to specify the optimal solution for your needs. Please contact us to discuss how a custom cold mirror can benefit your system or instrument.

 

Features

- High visible light transmission

- Sharp cut-on point

- High infrared reflection

- Durability

- Laser damage threshold

 

Parameters

Product name	Cold Mirror Filter
Substrate	Fused silica or custom
Visible light	>95% transmission
Infrared reflection	>95% reflection percentage
Laser damage	>1 J/cm2 @ 532/633nm(common)
Dimension	15*15*1.2 or custom
Diameter Tolerance	±0.1mm
Thickness	1.2mm ±0.1mm
AOI	45°

 

Spectrum Transmission Curve

 

Applications

Cold mirrors, also known as hot mirrors, provide a simple but helpful way to control radiation based on wavelength and separate particular regions based on their application or sensitivity. Some critical applications include:

- Heat management in optics

- Ultraviolet protection

- Pyrometry

- Photography

- Laser applications

- Infrared filtering

 

How does optical microscopy work?

Optical microscopy magnifies an object through the refraction of light. The first step is to illuminate the sample with a light source that transmits light through the piece. A cold mirror filter reflects light with longer wavelengths while allowing shorter wavelengths to pass through. The sample must allow passage of the wavelengths used. The light is focused evenly onto the model.

 

Once illuminated, an objective lens gathers the light transmitted through or reflected by the sample. The objective lens acts as the first stage of magnification, collecting the light and enlarging the image of the object. The magnification power depends on the focal length of the objective.

 

After the objective, an eyepiece or ocular lens further magnifies the image. Acting as a magnifying glass, the eyepiece enlarges the image produced by the aim of the final, total magnification of the microscope. The eyepiece also allows the observer to view the virtual image.

 

The magnified image comes into focus in the image plane, where the observer can view the enlarged image by looking through the eyepiece. The image appears magnified and virtual, seeming to float within the microscope. Knobs allow precise focusing of the image for maximum sharpness and clarity.

 

The optical principles enabling magnification and image formation are refraction and image focusing. As light passes through the objective and eyepiece, it is bent and redirected based on the index of refraction of the glass, focal lengths of the lenses, and their positioning. The degree of magnification depends on the focal lengths of the lenses and their separation, with longer focal lengths and greater separation producing higher magnification.

 

The resolution, or the minor visible details, depends on the numerical aperture of the objective, which determines the breadth of incoming light cones focused on points in the image plane. Higher numerical apertures provide more excellent resolution.

 

An actual image first forms between the objective rear focal plane and infinity. The eyepiece then magnifies this image, allowing it to be viewed as an enlarged virtual image. The image location depends on lens configurations and the observer's visual accommodation.

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