TAILIEUCHUNG - COHERENCE AND ULTRASHORT PULSE LASER EMISSION_2

Tham khảo sách 'coherence and ultrashort pulse laser emission_2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Part 2 Ultrashort Laser Pulse Emission and Applications 9 Second Harmonic Generation under Strong Influence of Dispersion and Cubic Nonlinearity Effects Sergey Mironov1 Vladimir Lozhkarev1 Vladislav Ginzburg1 Ivan Yakovlev1 Grigory Luchinin1 Efim Khazanov1 Alexander Sergeev1 and Gerard Mourou2 institute of Applied Physics Nizhny Novgorod 2Institut de la Lumière extrème ILE Palaiseau Russia 2France 1. Introduction High intensity contrast ratio ICR is required for majority of experiments with strong-field radiation. The demands to temporal intensity profile are determined by task of application of super strong radiation. As a rule the experiments require ICR as higher as possible. 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 cm2. At such high intensities cubic polarization of frequency doubling media is needed to be taken into consideration. The polarization leads to nonlinear phase accumulation of interacted waves Razumikhina Telegin et al. 1984 Choe Banerjee et al. 1991 Chien Korn et al. 1995 Ditmire Rubenchik et al. 1996 Mironov Lozhkarev et al. 2009 and small-scale self-focusing SSSF appearance Bespalov and Talanov 1966 Rozanov and Smirnov 1980 Lowdermilk and Milam 1981 Kochetkova Martyanov et al. 2009 Poteomkin Martyanov et al. 2009 . The present research is devoted to demonstration of a possibility of SHG process implementation for ICR enhancement. In the chapter we present theoretical and experimental results of SHG of output radiation of petawatt level femtosecond laser Lozhkarev Freidman et al. 2007 . The influence of cubic polarization and dispersion effects are taken into account in the theoretical model. The

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