Multi-Reflection Sample Cell Layout for Low-Astigmatism Gas Analysis

The patent replaces traditional mechanical mirror-based optical systems with an acousto-optic modulator (AOM) system. The AOM uses acoustic waves to create diffraction gratings in an acoustic medium, enabling light reflection and modulation without physical mirrors. This substitution eliminates scattered light from mirror surfaces and reduces beam astigmatism while maintaining the capability for multiple light passes through the gas sample.

The acousto-optic system provides self-adjusting beam quality through the controlled propagation of acoustic waves in the AOM crystal. The acoustic field naturally forms diffraction gratings that automatically optimize light reflection and focusing without requiring mechanical adjustment mechanisms. The system self-regulates beam quality through the inherent properties of acoustic wave propagation and diffraction physics.

The patent replaces mechanical mirror assemblies with an acousto-optic modulator system that achieves light reflection through acoustic wave-induced diffraction. This eliminates the need for mechanically mounted mirrors that are susceptible to thermal expansion and mechanical drift. The AOM system provides superior thermal and mechanical stability as it relies on acoustic field control rather than mechanical positioning.

The patent employs multiple acoustic deflection modes in the AOM to create three-dimensional light path folding within a compact volume. By utilizing acoustic waves propagating in different directions and modes, the system achieves multiple light passes through the gas sample without requiring a long linear optical path. This dimensional approach to light path configuration enables compact cell design while maintaining sufficient optical path length for effective gas analysis.