Topic
Pulse duration
About: Pulse duration is a research topic. Over the lifetime, 19429 publications have been published within this topic receiving 286507 citations.
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TL;DR: In this paper, a one-dimensional theoretical model is presented in which the time dependence of the photoacoustic response is evaluated for systems of variable optical absorption coefficient and sample thickness for which nonradiative relaxation processes occur instantaneously on the time scale of the measurement.
Abstract: Most conventional photoacoustic spectroscopy of solids has employed a periodically modulated light source. The availability of high‐intensity pulsed light sources of short pulse duration makes possible the study of the time response of a photoacoustic system in which the solid is excited by a single optical pulse. A one‐dimensional theoretical model is presented in which the time dependence of the photoacoustic response is evaluated for systems of variable optical absorption coefficient and sample thickness. The analysis is restricted to the case for which nonradiative relaxation processes occur instantaneously on the time scale of the measurement. Typical response curves for optically excited systems are presented and interpreted in terms of physical processes occurring in the cell.
69 citations
TL;DR: The results demonstrated that the DSR phenomenon could exist in Yb-doped fiber lasers, which could be used to achieve wave-breaking-free, ultrahigh-energy pulse.
Abstract: We reported on the dissipative soliton resonance (DSR) phenomenon in a mode-locked Yb-doped fiber laser by using the nonlinear polarization rotation technique. It was found that the multi-pulse oscillation under high pump power could be circumvented by properly adjusting the polarization controllers, namely, the wave-breaking-free rectangular pulse in DSR region was achieved. As the DSR signature, the pulse duration varied from 8.8 ps to 22.92 ns with the increasing pump power. Correspondingly, the maximum pulse energy was 3.24 nJ. The results demonstrated that the DSR phenomenon could exist in Yb-doped fiber lasers, which could be used to achieve wave-breaking-free, ultrahigh-energy pulse.
69 citations
10 Sep 2000
TL;DR: In this article, a double-chirped mirror technique (DCM) was proposed to reduce the group delay dispersion (GDD) and achieved sub-6-fs pulses.
Abstract: Today's ultrafast all-solid-state lasers continue to demonstrate unsurpassed performances in terms of pulse duration, pulse repetition rates, average power and wavelength range. Optical pulses in the 5-femtosecond range are produced by a variety of methods. Although different in technical detail, each method relies on the same three key components: spectral broadening due to the nonlinear optical Kerr effect, dispersion control, and ultrabroadband amplification. The shortest pulses generated to date all rely on chirped mirrors for dispersion compensation. A major limitation in chirped mirror design arises due to interference between light reflected at different penetration depths inside the minor structure. This results in residual oscillations in the group delay dispersion (GDD) which ultimately limits pulse shortening Unfortunately, there is always a trade-off-between GDD-oscillations and reflection bandwidth. The double-chirped mirror technique (DCM) reduced GDD oscillations and resulted in the sub-6-fs pulses. Novel DCM designs result in a sufficiently large reflection bandwidth that could, in principle, support 4-fs pulses. The technique of Kerr lens mode-locking, successful with Ti:sapphire, has not performed so well in directly diode-pumped lasers. Semiconductor saturable absorber mirrors (SESAMs) were a breakthrough resulting in the first demonstration of self-starting and stable passive mode locking of diode-pumped solid-state lasers with an intracavity saturable absorber. The design freedom of SESAMs has allowed us systematically to investigate the stability regime of passive cw mode-locking with an improved understanding and modeling of Q-switching instabilities. Simple design guidelines allowed us to push the frontiers of ultrafast solid-state lasers.
69 citations
TL;DR: In this paper, an electron microscopic study showed that, below 100 fs, an extreme precision and a substantial decrease of the ablation threshold fluence with respect to pulse laser processing with pulses in the picosecond and nanosecond range could be achieved.
69 citations
TL;DR: In this article, a Tm-doped Lu2O3 ceramic laser was used to achieve femtosecond mode locking using an ion-implanted InGaAsSb quantum-well-based SESAM.
Abstract: Femtosecond mode locking of a Tm-doped Lu2O3 ceramic laser is reported. Transform-limited pulses as short as 180 fs are generated at 2076 nm with an average output power of 400 mW and a pulse repetition frequency of 121.2 MHz. An output power up to 750 mW can be reached at the somewhat longer pulse duration of 382 fs. Femtosecond pulse generation is realized in the 2030-2100 nm spectral range. Passive mode locking was achieved using an ion-implanted InGaAsSb quantum-well-based SESAM.
69 citations