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Journal Articles

Observation of the laser-induced surface dynamics by the single-shot X-ray laser interferometer

Hasegawa, Noboru; Ochi, Yoshihiro; Kawachi, Tetsuya; Nishikino, Masaharu; Ishino, Masahiko; Imazono, Takashi; Kaihori, Takeshi; Sasaki, Akira; Terakawa, Kota*; Minami, Yasuo*; et al.

Proceedings of SPIE, Vol.8140, p.81400G_1 - 81400G_8, 2011/10

 Times Cited Count:3 Percentile:82.27

We have developed a soft X-ray laser (SXRL) interferometer capable of the single-shot imaging of nano-scaled structure dynamics. The interferometer consisted of the reflection optics including double Lloyd's mirrors and focusing optics, and the interference fringes are produced on the detector surface. By using this interferometer, the initial stage ($$sim$$50 ps) of the ablation process of the Pt surface pumped by a 70 fs Ti:Sapphire laser pulse was observed. The expansion speed of the surface estimated from the result (34 nm/50 ps) indicated that the nano-bubble structures were formed in the initial stage of the ablation. In order to observe the detailed dynamics, the temporal synchronization between the pump and probe pulses was improved to be 3 ps by adopting a portion of the SXRL and pump beams as the time fiducials, to which the pump and probe timing was adjusted by using the X-ray streak camera.

Journal Articles

Observation of femtosecond laser ablation process by using the soft X-ray laser interferometer

Yamamoto, Minoru; Hasegawa, Noboru; Terakawa, Kota*; Umeda, Yoshifumi*; Tomita, Takuro*; Ochi, Yoshihiro; Nishikino, Masaharu; Ishino, Masahiko; Imazono, Takashi; Kaihori, Takeshi; et al.

Proceedings of 12th International Symposium on Laser Precision Microfabrication (LPM 2011) (Internet), 4 Pages, 2011/06

Femtosecond lasers have been used for material processing. However, the physical processes responsible for femtosecond laser ablation have not been understood completely. These processes involve melting, vaporization, re-solidification or ablation, which occur in a very short time from pico- to nano-seconds. To understand the physical processes, it is essential to reveal the dynamics of ultrafast surface morphological change after laser irradiation. At JAEA, the laser-driven plasma soft X-ray laser (SXRL) that has extremely high spatial and spectral purity was constructed. It delivers soft X-ray photons at 89.2 eV (13.9 nm) with a photon number of exceeding $$10^{10}$$, which is sufficient to obtain a single shot interferogram. By using this system, the soft X-ray laser interferometer with the lateral resolution of 1.8 $$mu$$m and a depth resolution of 1 nm was developed. We report on demonstration of time-resolved measurement of femtosecond-laser ablation dynamics by using the soft X-ray laser interferometer.

Oral presentation

Incubation effect of femtosecond-laser ablation

Yamamoto, Minoru; Hasegawa, Noboru; Terakawa, Kota*; Umeda, Yoshifumi*; Tomita, Takuro*; Ochi, Yoshihiro; Kawachi, Tetsuya; Oba, Toshiyuki; Kaihori, Takeshi; Minami, Yasuo*; et al.

no journal, , 

no abstracts in English

Oral presentation

Time-resolved observation of the laser ablation dynamics by the plasma X-ray laser interferometer

Hasegawa, Noboru; Yamamoto, Minoru; Ochi, Yoshihiro; Kawachi, Tetsuya; Suemoto, Toru; Tomita, Takuro*; Terakawa, Kota*; Minami, Yasuo*; Umeda, Yoshifumi*

no journal, , 

We have developed a pump-probe soft X-ray laser (SXRL) interferometer for studying the initial process of the laser ablation dynamics. The depth and lateral resolution of the interferometer was 1 nm and 1.8 micron, respectively. By using this interferometer, the initial state dynamics of the Pt surface irradiated by the 70 fs laser pulse was firstly observed.

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