Symmetric moving-optical-wedge interferometer for Fourier transform spectroscopy: a step toward miniaturization

Area of Science:

• Optical Physics
• Spectrometry
• Interferometry

Background:

• Traditional moving-optical-wedge interferometers used in Fourier transform spectrometry exhibit significant drawbacks.
• These limitations include asymmetry in visibility and interferogram patterns, substantial physical volume and weight, and extensive wedge motion.
• These issues hinder performance and practicality in various spectroscopic applications.

Purpose of the Study:

• To propose a modified optical-wedge interferometer design to address the shortcomings of conventional systems.
• To enhance the performance and practicality of Fourier transform spectrometry through an improved interferometer.
• To achieve greater symmetry, reduced physical footprint, and increased optical throughput.

Main Methods:

• The proposed interferometer utilizes a configuration of two pairs of optical wedges.
• This design modification is implemented within the framework of Fourier transform spectrometry.
• Key performance metrics such as visibility pattern, interferogram symmetry, size, weight, and wedge motion were evaluated.

Main Results:

• The modified interferometer demonstrates symmetry in both the visibility pattern and the interferogram.
• The physical size and weight of the instrument are effectively halved compared to the ordinary design.
• Wedge motion is also reduced by half, leading to a significant increase in optical throughput.

Conclusions:

• The proposed two-pair optical-wedge interferometer offers a superior alternative to traditional designs for Fourier transform spectrometry.
• The enhancements in symmetry, size, weight, and throughput provide practical advantages for spectroscopic analysis.
• This modified design represents a significant advancement in the field of interferometry for spectrometry.