A broadband configuration for static Fourier transform spectroscopy with bandpass sampling

Area of Science:

• Spectroscopy
• Optical Engineering
• Instrument Design

Background:

• Traditional Fourier transform spectrometers (FTS) can be bulky and complex.
• Achieving high resolution often requires specialized detectors or sampling techniques.
• Existing methods may face challenges with Nyquist sampling rates for broadband applications.

Purpose of the Study:

• To propose a new broadband static Fourier transform spectrometer (static-FTS) configuration.
• To reduce spectrometer size while maintaining high spectral resolution.
• To enable high-resolution spectroscopy using standard CCD cameras.

Main Methods:

• A novel static-FTS configuration is presented, dividing the spectrum into multiple narrow bands.
• The technique addresses the Nyquist sampling rate issue inherent in broadband spectroscopy.
• A dedicated algorithm is developed for processing interferograms recorded by CCD cameras.

Main Results:

• The proposed static-FTS configuration significantly decreases spectrometer size.
• It operates within the 400 nm-1100 nm range with resolutions of 1 cm⁻¹ or better.
• High-resolution spectra are successfully recorded using regular CCD detectors.

Conclusions:

• The new static-FTS design offers a compact and efficient solution for high-resolution spectroscopy.
• This approach overcomes limitations of traditional FTS systems, particularly regarding size and detector requirements.
• The developed algorithm effectively processes data for accurate spectral analysis.