Relation Between Discharge Length and Laser Pulse Characteristics in Longitudinally Excited CO2 Laser
- 130 Downloads
A longitudinally excited CO2 laser pumped by a fast discharge emits a short laser pulse, similarly to TEA and Q-switched CO2 lasers. We investigated the relation between the discharge length and the laser pulse characteristics to develop a longitudinally excited CO2 laser producing a high spike laser pulse. We examined discharge lengths of 30, 45, and 60 cm, using the same mirrors and the same excitation circuit with the same input energy. A longer discharge length increased the discharge volume and improved the laser output energy. However, the longer discharge length caused a long discharge formation time (a slow fall time of the discharge voltage) due to the higher discharge impedance, which resulted in a long laser pulse tail. Therefore, the longitudinally excited CO2 laser had optimum conditions for obtaining a high spike laser pulse effectively.
KeywordsLongitudinal excitation CO2 laser Fast discharge Laser pulse shape
- 1.K. Uno, K. Nakamura, T. Goto, and T. Jitsuno, J. IR. mm. THz. Wave. 30, 1123-1130 (2009).Google Scholar
- 2.K. Uno, T. Jitsuno, and T. Akitsu, J. IR. mm. THz. Wave. 33, 485-490 (2012).Google Scholar
- 3.H.-J. Chung, D.-H. Lee, J.-H. Hong, J.-H. Joung, Y.-M. Sung, S.-J. Park, and H.-J. Kim, Rev. Sci. Instrum. 73, 484-485 (2002).Google Scholar