Suppression of the pedestal in a chirped-pulse-amplification laser
نویسندگان
چکیده
The pedestal (prepulse and postpulse) associated with a chirped-pulse-amplification (CPA) laser is studied. Four components have been identified that contribute to the pedestal. Pulses are spectrally shaped by gain narrowing in a frequency-matched, regenerative amplifier, while self-phase modulation is avoided. The intensity contrast is further improved through the use of a saturable absorber, resulting in Gaussian pulses of -0.9ps duration with an intensity contrast exceeding 105:1. Both experimental and numerical descriptions of these processes are presented. This investigation makes possible the study of high-intensity ultrashort laser-plasma interactions with a fiber-grating CPA system.
منابع مشابه
Development of cryogenically-cooled Yb:YLF chirped-pulse amplification laser for pumping few-cycle optical-parametric chirped-pulse amplification
As a pump source for intense few-cycle laser system with optical-parametric chirped-pulse amplification (OPCPA), we have been developing cryogenically-cooled Yb:YLF chirped-pulse amplification laser. So far we have successfully obtained high energy output pulse with 107 mJ of energy from a single-stage regenerative amplifier, which can be compressed to 2.2 ps in duration without pedestal. An ad...
متن کاملPumP-Induced TemPoral conTrasT degradaTIon In oPTIcal ParameTrIc chIrPed-Pulse amPlIfIcaTIon
LLE Review, Volume 111 135 Introduction Laser–matter interactions in new regimes have occurred due to the generation of high-intensity optical pulses using largescale laser systems.1 The interaction regime of a laser pulse with a target is basically set by the peak intensity of the pulse, which is fundamentally proportional to the ratio of the pulse energy to the duration of the pulse and surfa...
متن کاملTransform-limited pulses for chirped-pulse amplification systems utilizing an active feedback pulse shaping technique enabling five time increase in peak power.
A fiber-based chirped-pulse amplification (CPA) system with an active feedback loop for pulse shaping is experimentally demonstrated. A spectral processor is used in conjunction with a frequency-resolved optical gating measurement to produce high-quality pulses. Spectral phase and intensity shaping are utilized to generate a clean, high-contrast, transform-limited pulse with 15 dB pedestal supp...
متن کاملAT/P5-02- POSTER 1 Control of Amplified Spontaneous Emission in the Laser system for Intense Laser Plasma Acceleration Research
One of the emerging trends in new accelerator techniques is the laser based acceleration of particles, known as laser – plasma acceleration. Interaction of intense ultra short laser pulse with matter generates oscillations in hot plasma and the subsequent acceleration of electrons in a wakefield .Electrons can be accelerated to around 100 MeV within 1 mm distance. Ion beams can also be produced...
متن کاملNumerical Simulation of an Intense Isolated Attosecond Pulse by a Chirped Two-Color Laser Field
We investigate theoretically the high-order harmonic spectrum extension and numerical generation of an intense isolated attosecond pulse from He+ ion irradiated by a two-color laser field. Our simulation results show that the chirp of the fundamental field can control HHG cutoff position. Also, these results show that the envelope forms of two fields are important factors for controlling the re...
متن کامل