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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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A 4-m Asymmetric Czerny-Turner Grating Spectrograph.

J H Callomon, G G Chandler

|January 15, 2010

Summary

A new high-resolution vacuum spectrograph was designed and built. This Czerny-Turner instrument achieves a resolving power of at least 700,000, enabling detailed spectral analysis.

Area of Science:

Spectroscopy
Optical Engineering
Physics

Background:

Czerny-Turner spectrographs are widely used for high-resolution spectroscopy.
Optimizing aberration correction is crucial for achieving high resolving power.

Purpose of the Study:

To design and construct a novel high-resolution asymmetric Czerny-Turner grating vacuum spectrograph.
To achieve a resolving power of at least 700,000.

Main Methods:

Utilized an asymmetric Czerny-Turner design with two equal-radii, non-concentric spherical mirrors.
Incorporated a sideways-grating translation mechanism for optimal aberration correction.
Employed ray tracing calculations to determine configurations for minimum aberrations.
Constructed a 4-meter focal length vacuum spectrograph.

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Main Results:

The spectrograph was successfully designed and constructed.
Preliminary tests indicate a resolving power of at least 700,000 in the green spectral region.
High resolution was maintained across the entire 50-cm plate.

Conclusions:

The developed spectrograph meets the design goals for high-resolution spectral analysis.
The asymmetric design and adjustable grating offer superior performance.
This instrument is suitable for demanding spectroscopic applications requiring exceptional resolving power.