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High quality optical windows / flats across a wide range IR, VIS/NIR, and UV substrates. We specialize in custom optical window.

1.Plane Windows are used as substrates for a variety of applications, such as laser windows, output couplers, beamsplitters, beam combiners, mirrors, dichroic filters and plate polarizers.

Plane Windows listed under UV / VIS / NIR substrates are specified for applications involving coating wavelengths 193 nm ≤ λ ≤ 2.0 µm. Units for these substrates are given in mm.
Plane Windows listed under IR substrates are specified for applications involving coating wavelengths λ ≤ 2.0 µm. Units for these substrates are given in inches. 

Round, square, and rectangular windows are available in a wide range of size and shape specifications.

2.Parallel Windows are similar to Plane Windows, but with parallel surfaces.

These windows are well suited for applications in which angular deviation of the transmitted beam must be kept as small as possible. Misalignment errors are also minimized when the window is repeatedly inserted and removed.

3.Large Wedge Windows greatly reduce or eliminate interference effects caused by multiple reflections between front and rear surfaces of Plane Windows.
They are well suited for use as substrates for laser output couplers in which the reflection from the second surface must be completely eliminated from the gain medium of very sensitive lasers.
Large Wedge Windows are also known as Interferometer Flats. A pair of identical wedges are used to create an adjustable beam steering device.

4.Brewster Windows are windows designed for use at Brewster's angle (usually uncoated). This is the angle where only incident p-polarized light has 0% transmission loss.

They are an economical option for coupling linearly polarized light into sealed optical systems and to select the polarization of light traveling in optical cavities.
Brewster's angle can be calculated using the following equation:

θ_B=Arctan(nw/na)

Where θ_B is Brewster's angle and nw and na are the indices of refraction for the window and the ambient respectively. na is usually assumed to be 1 for air.