Department of Physics2024-11-1020060740-322410.1364/JOSAB.23.0007602-s2.0-33744813249http://dx.doi.org/10.1364/JOSAB.23.000760https://hdl.handle.net/20.500.14288/16608We describe a new class of femtosecond laser cavity designs that are based on a Herriott-type multipass cavity (MPC) to effectively increase the length of a standard laser resonator. MPC laser designs can be used to increase the output pulse energies or to make more compact resonator configurations. A general theory for MPC lasers is developed by analyzing a periodic optical system, and the conditions are established for the case in which the q parameter of a Gaussian beam is left invariant after a single transit through the system. On the basis of this analysis, we determine the design criteria for two-mirror q-preserving MPCs. Practical laser cavity choices are presented and their trade-offs are examined. We also discuss various experimental setups that use these novel MPC designs to increase pulse energies while maintaining compact cavities.PhysicsJournal Articlehttps://www.scopus.com/inward/record.uri?eid=2-s2.0-33744813249&doi=10.1364%2fJOSAB.23.000760&partnerID=40&md5=9354b14f6cc78364fa23a5a738541ca8Q312347