Parasitic lasing suppression in high gain femtosecond petawatt Ti:sapphire amplifier

Abstract

New parasitic lasing suppression techniques are developed and high gain amplification is demonstrated in a petawatt level Ti:sapphire amplifier based on the chirped pulse amplification (CPA) scheme. Cladding the large aperture Ti:sapphire with refractive-index matched liquid doped with absorber suppresses the transverse lasing. The acousto-optic programmable dispersive filter (AOPDF) is used to realize side-lobe suppression in the temporal profile of the compressed pulse. The 800 nm laser output with peak power of 0.89 PW and pulse width of 29.0 fs is demonstrated.

Cooling-induced increase of methane cluster size investigated under a Coulomb explosion scheme

“…The proposal paves the way for future research on the tabletop laser-driven fusion [13,19] , which can provide highflux sources of clean fusion neutrons and short pulse durations. A petawatt-laser-produced [20] fusion neutron source may be of considerable importance to studies on radiation-induced damage on materials, as well as benefit fast neutron radiography, in which the small source size could lead to a high spatial resolution [21] . We have recently demonstrated an efficient fusion neutron generation by using CD 4 clusters under the irradiation of 120-mJ and 60-fs laser pulses [22] .…”

Recent Development and Progress on Femtosecond Petawatt Ti:sapphire Laser in SIOM

“…8 It consists of a self-modelocked 10 fs Ti:sapphire oscillator, an acousto-optic programmable dispersive fi lter (AOPDF), pulse stretcher, regenerative amplifi er, three stages of multipass amplifi ers and a four-grating compressor, as shown in Fig. 1.…”

“…Recently, the CPA laser is more attractive and matured with the development of large aperture ultra-broadband Ti:sapphire crystal. Intense ultrashort pulse Ti:sapphire lasers with peak power of higher than 100 TW 2 6 and even petawatt level system 7,8 have been developed in many laboratories. Meanwhile, these kinds of powerful CPA lasers give rise to the birth and breakthrough of new science and technology, such as the fast ignition approach of laser fusion, bright X-ray generation, relativistic particle acceleration, laboratory astrophysics and experimental quantum electrodynamics.…”

Second Harmonic Generation under Strong Influence of Dispersion and Cubic Nonlinearity Effects

“…SHG process of powerful femtosecond radiation is known to be an excellent approach to significant enhancement of a temporal intensity profile. The peak power of output radiation of modern laser complexes exceeds the petawatt level (Aoyama, Yamakawa et al 2003;Lozhkarev, Freidman et al 2007;Liang, Leng et al 2007 ;Yanovsky, Chvykov et al 2008 ) and power density in the radiation is in a range of 10TW/cm 2 . At such high intensities cubic polarization of frequency doubling media is needed to be taken into consideration.…”