Ablation of insulators under the action of short pulses of X-ray plasma lasers and free-electron lasers

Иногамов Н.А., Анисимов С.И., Жаховский В.В., Фаенов А.Ю., Петров Ю.В., Хохлов В.А., Фортов В.Е., Скобелев И.Ю., Като Ю., Пикуз Т.А., Шепелев В.В., Фукуда Ю., Танака М., Кишимото М., Ишино М., Нишикино М., Кандо М., Кавачи Т., Нагасоно М., Охаши Н., Ябаши М., Тано К., Сенда Ю., Тогаши Т., Ишикава Т. Абляция диэлектриков под действием коротких импульсов рентгеновских плазменных лазеров и лазеров на свободных электронах // Оптический журнал. 2011. Т. 78. № 8. С. 5–15.

N. A. Inogamov, V. V. Zhakhovsky, A. Ya. Faenov, V. E. Fortov, Y. Kato, V. V. Shepelev, Y. Fukuda, M. Kishimoto, M. Nagasono, H. Ohashi, Y. Senda, M. Yabashi, K. Tono, M. Tanaka, I. Yu. Skobelev, T. A. Pikuz, S. I. Anisimov, Yu. V. Petrov, M. Ishino, T. Ishikawa, T. Togashi, M. Nishikino, V. A. Khokhlov, M. Kando, and T. Kawachi, "Ablation of insulators under the action of short pulses of X-ray plasma lasers and free-electron lasers," Journal of Optical Technology. 78(8), 473-480 (2011). https://doi.org/10.1364/JOT.78.000473

An experimental and theoretical study has been carried out of the ablation of a solid insulator with a wide band gap (LiF) under the action of ultrashort laser pulses of the UV range, obtained in a free-electron laser (pulse width τL=0.3ps, photon energy ħωL=20.2eV), and the soft X-ray region, obtained in a silver-plasma laser (τL=7ps, ħωL=89.3eV). A comparison is made of the results obtained on the two laser systems. It is shown that the ablation threshold is about the same for both lasers. A theory is presented that explains the weak growth of the ablation mass with increasing surface energy density of the laser radiation (the fluence) in the case of X-ray lasers as a result of the transition from spallation close to the ablation threshold to evaporative ablation at high fluence values.

The research was supported by the Ministry of education, science, sport and culture of Japan (Grant-in-Aid for Kiban A No 20244065, Kiban B No. 21360364), RFBR (projects Nos. 10-02-00434-a, 09-02-92482-MNKS-a, 10-02-00345) and Basic research programs of the Presidium of RAS Nos. 2 and 22.