Spectroscopy

Quantum mechanics

Reflection (computer programming)

Linguistics

Tunable diode laser absorption spectroscopy

Philosophy

Materials science

Absorption (acoustics)

Computer science

TRACE (psycholinguistics)

Laser

Physics

Trace gas

Optics

Tunable laser

Programming language

Meteorology

Absorption spectroscopy

Chinese Optics Letters

In the field of absorption spectroscopy, the multipass cell (MPC) is one of the key elements. It has the advantages of simple structure, easy adjustment, and high spectral coverage, which is an effective way to improve the detection sensitivity of gas sensing systems such as tunable diode laser absorption spectroscopy. This invited paper summarizes the design theory and the research results of some mainstream types of MPCs based on two mirrors and more than two mirrors in recent years, and briefly introduces the application of some processed products. The design theory of modified ABCD matrix and vector reflection principle are explained in detail. Finally, trends in its development are predicted.

Advances in multipass cell for absorption spectroscopy-based trace gas sensing technology [Invited]