Automodulations in Kerr-lens mode-locked solid-state lasers

Multipulse operation and limits of the Kerr-lens mode-locking stability

“…As was shown in [17] on the basis of the aberrationless approximation, the soliton-like pulse, i.e., the pulse with the -time profile and the negligible chirp, exists in the parameter range, which is wider than the soliton model prediction, and becomes unstable in the vicinity of due to the automodulational instability.…”

“…One should also distinguish the stable multipulse operation from the generation of the double pulses colliding in an active medium [13]- [16]. It should be noted that the transition to multipulse operation is not the sole scenario of the stability loss in the continuous-wave (CW) mode-locked solid-state lasers: the automodulational instability can produce regular as well as nonregular oscillations of the single pulse or the so-called picosecond collapse with the abrupt transition from the femtosecond to the picosecond generation [17], [18]. The stable multipulse operation in the negative GDD region was experimentally observed in Ti:sapphire [1], [19]- [21], Cr:LiSGaF [22] and Yb:KYW [23] Kerr-lens mode-locked lasers as well as in Nd:glass [24], Ti:sapphire [4], and Cr :YAG [25] lasers mode locked by a semiconductor saturable absorber mirror.…”

Towards a Compact Thin-Disk-Based Femtosecond XUV Source

“…The description of self-Q-switching and chaotic QML is given in experimental sec.3.4. The QML instability for the case of KLM was also studied experimentally [48] and theoretically [49], but mostly for Ti:Sa bulk oscillators with the rather short relaxation time of <5 µs. The saturation behaviour of soft-aperture KLM in Fig.1.4 is most likely the main reason for the suppression of QML in the experiments.…”

Theory of sub-10-fs generation in Kerr-lens mode-locked solid state lasers with a coherent semiconductor absorber

“…The stability of the solution results from the self-induced transparency in absorber, when the pulse propagates in the condition of the positive net-gain but noise is suppressed due to Rabi flopping of the absorber population. We do not analyze the automodulational stability [16] of the solution since it has been demonstrated directly by the numerical simulation in [10].…”

“…Let us study an automodulational stability of the coherent laser pulse, which we showed before to be very important factor in fs-lasers [16]. We used an aberrationless approximation, which assumes an approximately unchanged form of solution and z-dependence for the pulse parameters.…”