Littrow Prism

Name: Littrow Prism
Brand: ECOPTIK(CHINA)LTD

In optics, a Littrow prism or Littrow spectrometer or Littrow mirror is a reverse-reflecting dispersion prism arranged in such a way that the deviation of the incident beam entering at Brewster Angle is minimized, so the most dispersive Littrow prism is usually a 30°/60°/90° prism with a reflective film coated on the opposite surface of the 60° Angle. A typical Littrow prism is used at the end of a laser optical cavity to adjust the output frequency of the laser by changing the Angle of incidence.

Uses Littrow Prism 

Descriptions Specifications Product List

Descriptions

Descriptions of Littrow Prism

As shown in the figure, half a 60° dispersion prism is plated with a reflection film layer on the long side of the right Angle. Through reflection, half a prism acts as a 60° dispersion prism. The compact structure of the Littrow dispersion prism system. For some expensive prism materials such as quartz, using this prism can save material.

Both coated and uncoated Littrow prisms by Ecoptik China have an Angle tolerance of greater than 1 arcsecond, a 10/5 surface mass, a λ/20 surface accuracy, and a dimensional tolerance of +.001 in.

Specifications

Specifications of Littrow Prism

	Commercial	High precision
Material:	N-BK7, UV Fused Silica, other optical glass
Dimension Tolerance:	±0.1mm	±0.05mm
Surface quality:	60-40 S/D	10-5 S/D
Surface flatness:	λ/4@632.8nm	λ/8@632.8nm
Deviation 180°:	±3 arc min	±30 arc sec
Clear Aperture:	>85% of dimension
Bevel:	<0.25mm×45°
Coating:	Reflection coating, AR coating etc. upon requirement

Uses

Product List of Littrow Prism

Type No.	Dimension (mm)			Wavelength (nm)	Coating
Type No.	A	B	C	Wavelength (nm)	Coating
eco-LDP-1	12.7	21.9	12.7	350-2200	Uncoated
eco-LDP-2	12.7	21.9	12.7	400-700	Protected Aluminum
eco-LDP-3	22	38.11	22	350-2200	Uncoated

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We are accustomed to working with both optics specialists and non-specialists, so regardless of your optics knowledge, we can help. Get in contact with ECOPTIK team to review your specific application needs and options.

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