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2009年12月21日

【期刊论文】Mechanisms of femtosecond laser-induced breakdown and damage in MgO

贾天卿， S.Z. Xu a， *， T.Q. Jia a， b， H.Y. Sun a， C.B. Li a， X.X. Li a， D.H. Feng a， J.R. Qiu a， Z.Z. Xu a

Optics Communications 259 (2006)274-280，-0001，（）：

-1年11月30日

Single-shot laser damage threshold of MgO for 40-986 fs, 800 nm laser pulses is reported. The pump-probe measurements with femtosecond pulses were carried out to investigate the time-resolved electronic excitation processes. A theoretical model including conduction band electrons (CBE) production and laser energy deposition was applied to discuss the roles of multiphoton ionization (MPI) and avalanche ionization in femtosecond laser-induced dielectric breakdown. The results indicate that avalanche ionization plays the dominant role in the femtosecond laser-induced breakdown in MgO near the damage threshold.

Avalanche ionization， Laser-induced breakdown， Femtosecond laser， Time-resolved dynamics， MgO

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2009年12月21日

【期刊论文】Dynamics of femtosecond laser pulse induced damage in multilayers

贾天卿， Haiyi Sun a， *， Tianqing Jia a， Zhongchao Wei b， Jianrong Qiu a， c， Xiaoxi Li a， Chengbin Li a， Shizhen Xu a， Donghai Feng a， Hezhou Wang b， Zhizhan Xu a

Optical Materials 28 (2006) 1372-1376，-0001，（）：

-1年11月30日

摘要

We report the single-shot damage thresholds of MgF2/ZnS omnidirectional reflector for laser pulse durations from 50 fs to 900 fs. A coupled dynamic model is applied to study the damage mechanisms, in which we consider not only the electronic excitation of the material, but also the influence of this excitation-induced changes in the complex refractive index of material on the laser pulse itself. The results indicate that this feedback effect plays a very important role during the damage of material. Based on this model, we calculate the threshold fluences and the time-resolved excitation process of the multiplayer. The theoretical calculations agree well with our experimental results.

MgF2/， ZnS omnidirectional reflector， Damage threshold， Damage mechanism， Localized dynamics

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2009年12月21日

【期刊论文】Femtosecond laser-induced ZnSe nanowires on the surface of a ZnSe wafer in water

贾天卿， Tianqing Jiaa， b， *， Motoyoshi Babaa， Min Huangb， Fuli Zhaob， Jianrong Qiuc， Xiaojun Wub， Masaki Ichiharaa， Masayuki Suzukia， Ruxin Lic， Zhizhan Xuc， Hiroto Kurodaa

Solid State Communications 141 (2007) 635-638，-0001，（）：

-1年11月30日

摘要

We present a simple route for ZnSe nanowire growth in the ablation crater on a ZnSe crystal surface. The crystal wafer, which was horizontally dipped in pure water, was irradiated by femtosecond laser pulses. No furnace, vacuum chamber or any metal catalyst were used in this experiment. The size of the nanowires is about 1-3μm long and 50-150nm in diameter. The growth rate is 1-3μm/s, which is much higher than that achieved with molecular-beam epitaxy and chemical vapor deposition methods. Our discovery reveals a rapid and simple way to grow nanowires on designed micro-patterns, which may have potential applications in microscopic optoelectronics.

A.， Nanowire growth， B.， Laser ablation， C.， Crystal structure

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2009年12月21日

【期刊论文】Mechanisms of femtosecond laser-induced damage in magnesium fluoride

贾天卿， Haiyi Suna， *， Tianqing Jiaa， b， Chengbin Lia， Xiaoxi Lia， Shizhen Xua， Donghai Fenga， Xiaofeng Wanga， Xiaochun Gea， Zhizhan Xua

Solid State Communications 141 (2007) 127-131，-0001，（）：

-1年11月30日

摘要

We studied the single-shot damage in magnesium fluoride irradiated by 800 nm femtosecond (fs) laser. The dependence of damage thresholds on the laser pulse durations from 60 to 750 fs was measured. The pump-probe measurements were carried out to investigate the time-resolved electronic excitation processes. A coupled dynamic model was applied to study the microprocesses in the interaction between fs laser and magnesium fluoride. The results indicate that both multiphoton ionization and avalanche ionization play important roles in the femtosecond laser-induced damage in MgF2.

A.， Magnesium fluoride， D.， Damage mechanisms， E.， Femtosecond laser， E.， Pump–probe measurements

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2009年12月21日

【期刊论文】Formation of nanogratings on the surface of a ZnSe crystal irradiated by femtosecond laser pulses

贾天卿， T.Q. Jia， H.X. Chen， M. Huang， and F.L. Zhao， J.R. Qiu， R.X. Li， and Z.Z. Xu， X.K. He， J. Zhang， and H. Kuroda

，-0001，（）：

-1年11月30日

摘要

Two collinear femtosecond laser pulses, one at wavelength of 800nm and the other at 400nm (double frequency), simultaneously irradiated the surface of ZnSe crystal, which resulted in regular nanograting with period of 180 nm on the whole ablation area. We attribute the formation of the nanograting to be due to the interference between the surface scattered wave of 800 nm lasers and the 400nm light. The period of the nanograting is aboutλ/2n, where n is refractive index of the sample, andλ, the laser wavelength. This mechanism is supported by observation of rotation of the nanograting with the polarization of 400nm light, and by the dependence of λ of the nanoripples on the surface of semiconductors and dielectrics.

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