Propagation and absorption of high-intensity femtosecond laser radiation in diamond

被引:16
作者
Kononenko, V. V. [1 ,2 ]
Konov, V. I. [1 ,2 ]
Gololobov, V. M. [1 ]
Zavedeev, E. V. [1 ,2 ]
机构
[1] Russian Acad Sci, AM Prokhorov Gen Phys Inst, Moscow 119991, Russia
[2] Natl Nucl Res Univ, MEPhI, Moscow 115409, Russia
基金
俄罗斯基础研究基金会;
关键词
femtosecond laser radiation; diamond; multiphoton absorption; nonlinear propagation; femtosecond interferometry; FUSED-SILICA; INDUCED DENSIFICATION; PULSES; GLASS; BULK;
D O I
10.1070/QE2014v044n12ABEH015459
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Femtosecond interferometry has been used to experimentally study the photoexcitation of the electron subsystem of diamond exposed to femtosecond laser pulses of intensity 1011 to 1014 W cm(-2). The carrier concentration has been determined as a function of incident intensity for three harmonics of a Ti:sapphire laser (800, 400 and 266 nm). The results demonstrate that, in a wide range of laser fluences (up to those resulting in surface and bulk graphitisation), a well-defined multiphoton absorption prevails. We have estimated nonlinear absorption coefficients for pulsed radiation at lambda = 800 nm (four-photon transition) and at 400 and 266 nm (indirect and direct two-photon transitions, respectively). It has also been shown that, at any considerable path length of a femtosecond pulse in diamond (tens of microns or longer), the laser beam experiences a severe nonlinear transformation, determining the amount of energy absorbed by the lattice, which is important for the development of technology for diamond photostructuring by ultra-short pulses. The competition between wave packet self-focusing and the plasma defocusing effect is examined as a major mechanism governing the propagation of intense laser pulses in diamond.
引用
收藏
页码:1099 / 1103
页数:5
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