Progress in the growth of large scale Ti:sapphire crystals by the heat exchanger method (HEM) for petawatt class lasers

Joyce, David B.; Schmid, F.

doi:10.1016/j.jcrysgro.2009.11.002

Cited by 36 publications

(18 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Czochralski method [9], heat exchange method (HEM) [10,11], and temperature gradient technique [10,11] are the mostly used methods. At present, large size Ti:sapphire crystals, up to 200 mm clear aperture, are commercially available for high energy amplifiers of multi-PW femtosecond laser systems [11][12][13] (Figure 7). The laser pulse amplification in Ti:sapphire crystals is the result of the stimulated laser transition from the upper laser level to the lower laser level, under the inversion population condition between laser energy levels, in the presence of an input laser pulse with the photon quanta energy identical to the energy difference between laser energy levels.…”

Section: Femtosecond Pulses Amplification In Ti:sapphire Laser Crystalsmentioning

confidence: 99%

Femtosecond Laser Pulses Amplification in Crystals

Dabu

2019

Crystals

View full text Add to dashboard Cite

This paper describes techniques for high-energy laser pulse amplification in multi-PW femtosecond laser pulses. Femtosecond laser pulses can be generated and amplified in laser media with a broad emission spectral bandwidth, like Ti:sapphire crystals. By chirped pulse amplification (CPA) techniques, hundred-Joule amplified laser pulses can be obtained. Multi-PW peak-power femtosecond pulses are generated after recompression of amplified chirped laser pulses. The characteristics and problems of large bandwidth laser pulses amplification in Ti:sapphire crystals are discussed. An alternative technique, based on optical parametric chirped pulse amplification (OPCPA) in nonlinear crystals, is presented. Phase-matching conditions for broad bandwidth parametric amplification in nonlinear crystals are inferred. Ultra-broad phase matching bandwidth of more than 100 nm, able to support the amplification of sub-10 fs laser pulses, are demonstrated in nonlinear crystals, such as Beta Barium Borate (BBO), Potassium Dideuterium Phosphate (DKDP), and Lithium Triborate (LBO). The advantages and drawbacks of CPA amplification in laser crystals and OPCPA in nonlinear crystals are discussed. A hybrid amplification method, which combines low-medium energy OPCPA in nonlinear crystals with high energy CPA in large aperture laser crystals, is described. This technique is currently used for the development of 10-PW laser systems, with sub-20 fs pulse duration and more than 1012 intensity contrast of output femtosecond pulses.

show abstract

Section: Femtosecond Pulses Amplification In Ti:sapphire Laser Crystalsmentioning

confidence: 99%

Femtosecond Laser Pulses Amplification in Crystals

Dabu

2019

Crystals

View full text Add to dashboard Cite

show abstract

“…Stelian et al, 2016;Carmen Stelian et al, 2017), temperature gradient technique (TGT) (Ren et al, 2016;G. Zhou et al, 2006), heat exchange method (HEM) (Dong & Deng, 2004;Joyce & Schmid, 2010), vertical gradient freeze (VGF) method, hydrothermal technique (Song et al, 2005;Wang et al, 2009), micro-pulling down (-PD) (Ghezal et al, 2012;Kamada et al, 2018;Zhou et al, 2015), Bridgman method (Han et al, 2020) and Czochralski (Cz) (Alombert-Goget et al, 2016;FIELITZ et al, 2008;Hur et al, 2017;Li et al, 2013Li et al, , 2014.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Crystallite Size, Density, and Compositional of the Ti: Al2O3 Single Crystal

2020

View full text Add to dashboard Cite

The purposes of this research were to estimate the crystallite size, density, and chemical composition of the ingot Ti: Al2O3 crystal grown by the Czochralski method. The crystallite size and composition of Ti: Al2O3 crystals had been determined using x-ray diffraction (XRD) and energy-dispersive x-ray spectroscopy (EDXS). Based on the Archimedes principle, the density of the crystals had been determined. The XRD patterns showed a single central peak with high intensity for all samples. It indicated that all samples had a single crystal. The average value of the samples' crystallite size was in the range of 20.798 nm to 34.294 nm. The ingot crystal density and Ti composition increased from the top to the bottom part because the solid solution was distributed unevenly during the growth process.

show abstract

“…The largest Al 2 O 3 : Ti 3+ crystals existing today in the world have a diameter of the order of 180 mm with great difficulties of reproducibility. They are obtained by the growth method called HEM (Heat Exchange Method) [6]. But the other techniques such as Kyropoulos method are promising for obtaining large-diameter sapphire crystals able to meet the specifications [3] [7].…”

Section: Introductionmentioning

confidence: 99%