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High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis

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Published on: September 22, 2017

Asymmetric white-pupil collimators for high-resolution spectrographs.

R G Gratton¹, R Bhatia, A Cavazza

¹Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy. gratton@pd.astro.it

|March 18, 2008

Summary

This study introduces a novel white-pupil collimator design using two mirrors. Optimized conic coefficients and angles minimize aberrations, enabling more compact and cost-effective high-resolution spectrographs.

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Area of Science:

Optics and Optical Engineering
Spectroscopy Instrumentation

Background:

Traditional spectrograph designs often require large optical components.
Minimizing aberrations is crucial for high-resolution spectral analysis.

Purpose of the Study:

To present the optical principle of a novel white-pupil collimator.
To enable the design of more compact and cost-effective high-resolution spectrographs.

Main Methods:

Derivation of analytic formulas for third-order aberrations.
Comparison of theoretical results with ray-tracing experiments.

Main Results:

Image quality is enhanced with a suitable conic coefficient for the second mirror and an appropriate F ratio.
Third-order coma and astigmatism can be simultaneously eliminated by selecting appropriate angles.

Conclusions:

The proposed white-pupil collimator design offers good image quality.
This design leads to smaller cross dispersers and cameras in echelle spectrographs, reducing overall cost.