Design of new multipass gas cells with circular and elliptical cross-section
Two new types of multipass gas cells with circular and elliptical cross-sections were developed. As for a cylindrical cell, the reflected rays in the circle would be an irregular trace without superposition and termination, if its central angle is a bit more than 2 pi/3 for an example. Each two adjacent reflected points have the same optical path difference and optical light passes through differe