30° - 60° - 90° Littrow Dispersion Prisms

30° - 60° - 90° Littrow Dispersion Prisms

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.

Description Of  30° - 60° - 90° Littrow Dispersion Prisms


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.


Description_Of__30°_-_60°_-_90°_Littrow_Dispersion_Prisms.jpg


Both coated and uncoated Littrow prisms by ECOPTIK 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.

Specification Of 30° - 60° - 90° Littrow Dispersion Prisms



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


Product List


Product_List.jpg

Type No.

Dimension (mm)

Wavelength

(nm)

Coating

A

B

C

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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