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

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