We describe the design and mode-locked operation of compact femtosecond Ti3+:Al2O3 lasers based on novel multi-pass cavity (MPC) configurations. We first review the design guidelines of q-preserving MPCs which leave invariant the original spotsize distribution of the short cavity. The design and performance of a q-preserving and a non-q-preserving MPC Ti3+:Al2O3 laser are then described as examples. In the case of the non-q-preserving MPC, conditions needed to minimize the deviation from the q-preserving configuration are discussed. Both resonators are compact (30 cm x 45 cm) and operate around 31 MHz. With only 1.5 W of pump power, pulses as short as 19 fsec and with energies up to ~3.6 nJ were produced.
© 2004 Optical Society of America
(080.2730) Geometric optics : Matrix methods in paraxial optics
(140.3590) Lasers and laser optics : Lasers, titanium
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
(320.7090) Ultrafast optics : Ultrafast lasers
A. Sennaroglu, A. M. Kowalevicz, F. X. Kaertner, E. P. Ippen, and J. G. Fujimoto, "Novel Compact Femtosecond Lasers Based on Multi-Pass Cavities," in Advanced Solid-State Photonics (TOPS), G. Quarles, ed., Vol. 94 of OSA Trends in Optics and Photonics (Optical Society of America, 2004), paper 485.
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