Theory of solid-state laser mode locking by coherent semiconductor quantum-well absorbers
- 1 February 1999
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America B
- Vol. 16 (2), 323-338
- https://doi.org/10.1364/josab.16.000323
Abstract
Solid-state laser mode locking by semiconductor quantum-well absorbers (QWA’s) is investigated, with the coherent polarization response of the absorbers taken into account. It is shown that femtosecond pulses with durations below the response time and the dephasing time can be generated that are stabilized by Rabi flopping of the absorber population. The shortest pulses are found when the effects of self-phase modulation (SPM) and group-velocity dispersion (GVD) are not present, whereby highly stable 2π pulses are formed inside the absorber. In the presence of SPM and GVD the pulse area deviates from 2π; nevertheless, the absorber’s coherent response results in incomplete Rabi flopping of the population. In agreement with experimental observations, we found limited femtosecond pulse operation regions for the pump rate and the GVD. These parameter regions are bounded by Q-switching instabilities and multiple-pulse operation. Further, the influence of inhomogeneous broadening of the carriers, dynamic bandgap renormalization owing to Coulomb exchange, and excitation-dependent dephasing of highly excited semiconductors is studied. The key absorber parameters are predicted that should permit a reduction of the shortest possible pulse durations.Keywords
This publication has 51 references indexed in Scilit:
- Self-starting 65-fs pulses from a Ti:sapphire laserOptics Letters, 1997
- Sub-10-fs mirror-dispersion-controlled Ti:sapphire laserOptics Letters, 1995
- Pulse evolution in a broad-bandwidth Ti:sapphire laserOptics Letters, 1994
- Theory of Kerr-lens mode locking: role of self-focusing and radially varying gainJournal of the Optical Society of America B, 1994
- Analytic theory of additive pulse and Kerr lens mode lockingIEEE Journal of Quantum Electronics, 1992
- Kerr lens mode lockingOptics Letters, 1992
- Cavity design for optimum nonlinear absorption in Kerr-lens mode-locked solid-state lasersOptics Communications, 1992
- Beam reshaping and self-mode-locking in nonlinear laser resonatorsOptics Communications, 1991
- Femtosecond pulses from a continuously self-starting passively mode-locked Ti:sapphire laserOptics Letters, 1991
- 60-fsec pulse generation from a self-mode-locked Ti:sapphire laserOptics Letters, 1991