Andor Technology Mechelle User Manual

21
Version 4.2 rev 06 Oct 2020
8.2 x 8.2 mm / 512 x 512 sensor
Lowest Noise Imaging EMCCD
Mechelle
2.2 inteRnal coMponents oF tHe MecHelle
The main internal parts of the Mechelle are summarised below (refer to Appendix B for the principles of operation and
also www.andor.com/learning-academy/echelle-spectrographs-a-exible-tool-for-spectroscopy-raman-and-libs-spectroscopy).
Figure 2: Internal Components of the Mechelle (for illustration only)
Entrance Window
The entrance and (exit) window prevents ingress of dust and contaminants, and allows the internal space to be sealed
and purged with N
2
for best UV transmission.
Correction Lenses:
Two custom-made correction lenses are utilised to achieve good imaging resolution.
Collimating lens
This element ensures that light incoming on the dispersive element (prism) is collimated.
Echelle Grating
This type of grating provides good efciency performance over a large number of orders and wavelength range. Its
groove density also dictates the spectral resolution.
Double Prism
The broadband double prism design is used to achieve semi-equal order spacing for ultra-low cross-talk.
Exit Window
The exit (and entrance) window prevents ingress of dust and contaminants and allows the internal space to be sealed and
purged with N
2
for best UV transmission.
Purge Ports
The shutter housing can also be ushed with dry gas to remove any water vapour using the two purge ports to maximize
UV light transmission..
Sealed, N
2
lled
Chamber
Correction lens 2
Correction lens 1
Entrance
Window
EchelleEchelle
GratingGrating
Focusing
Mirror
Double
Prism
Flateld
Lens
Collimating Collimating
MirrorMirror
Shutter
Housing
To Camera
(Detector)
Input
from Light
Source
Shutter
(if tted)
Purge
Port
Purge Port
SlitSlit
Exit WindowExit Window

Andor Technology Mechelle Specifications

General

Brand	Andor Technology
Model	Mechelle
Category	Laboratory Equipment
Language	English