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IR Spectrometers

IR Spectrometers

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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Related Experiment Video

Updated: Jul 6, 2025

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Single-test Ritchey-Common interferometry.

Yiming Liu, Chuheng Xu, Yao Hu

|January 4, 2024

Summary

This summary is machine-generated.

This study introduces a single-test Ritchey-Common interferometry method for measuring large optical flats, significantly improving accuracy and reducing test time. The new approach overcomes the limitations of traditional multi-test methods, enhancing reliability and safety in optical metrology.

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Last Updated: Jul 6, 2025

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Area of Science:

Optical metrology
Interferometry
Precision engineering

Background:

Traditional Ritchey-Common tests for large optical flats are cumbersome and prone to errors due to multiple mirror position changes.
Existing methods suffer from poor repeatability, system errors, and potential safety risks, increasing test time and cost.
Limitations include extra mirror deformation and potential overturning, compromising measurement accuracy and reliability.

Purpose of the Study:

To develop a novel single-test Ritchey-Common interferometry method.
To eliminate defocus error and improve accuracy in measuring large optical flats.
To overcome the drawbacks of traditional multi-test approaches, enhancing efficiency and safety.

Main Methods:

A single-test Ritchey-Common interferometry approach is proposed, eliminating the need for mirror repositioning.
Sub-aperture measurement using a small-aperture interferometer precedes the main test, replacing system wavefront measurements.
Defocus is calculated in the sub-aperture at the same position, enabling accurate optical path modeling for surface form determination.

Main Results:

Experimental validation was performed on 100 mm and 2050 mm aperture flats.
The method achieved peak-to-valley (PV) and root-mean-square (RMS) errors of 0.0889 λ and 0.0126 λ, respectively, reaching the interferometer's accuracy limit.
Results demonstrate high accuracy and feasibility, comparable to standard interferometers but in a single test.

Conclusions:

The proposed single-test Ritchey-Common interferometry effectively eliminates defocus error and achieves high accuracy.
This method offers a more reliable, accurate, and cost-effective solution for large optical flat metrology.
The technique paves the way for practical and safe optical metrology in manufacturing large optical components.