RT - Journal Article T1 - Design of a circular multipass absorption cell for laser spectroscopy JF - opsi YR - 2015 JO - opsi VO - 21 IS - 0 UR - http://opsi.ir/article-1-642-en.html SP - 645 EP - 648 K1 - Absorption spectroscopy K1 - Multipass absorption cell K1 - Optical path length AB - Abstract- In this work a circular multipass absorption cell with low physical size and long path length is introduced. By using geometrical optics ray path inside the cell is traced and optimized for a certain entering angle to obtain maximum reflection. Then profile of the entering beam is simulated after exiting from the cell and the results have been compared with a reported experimental one. The obtained results indicate that simulation and experiment are in good agreement. LA eng UL http://opsi.ir/article-1-642-en.html M3 ER -