Title :
ps-laser photolysis of nitrogen solid films at a cryogenic temperature
Author :
Niino, Hiroyuki ; Sato, Takao ; Yabe, Atsushi
Author_Institution :
Nat. Inst. of Mater. & Chem. Res., Ibaraki, Japan
Abstract :
Summary form only given. In order to create new possibilities of laser ablation technique, the laser ablation of nitrogen solid films (thickness:>3 mm) on a Cu plate at 10 K was performed upon irradiation with a picosecond-UV laser (FHG of Nd:YLF laser; 263 nm, 8 ps, 10 Hz) in vacuum. UV and visible emissions, which were ascribed to the transition from excited molecular nitrogen (Vegard-Kaplan system; A-X transition) and atomic nitrogen (alpha emission: /sup 2/D-/sup 4/S transition at 523 nm), were detected on the film during the laser irradiation at the fluence of 5 J/spl middot/cm/sup -2/ pulse/sup -1/. These excited species would be produced on a multi-photon absorption process of the nitrogen by the ps-laser irradiation.
Keywords :
cryogenics; high-speed optical techniques; laser ablation; nitrogen; optical films; photolysis; 10 K; 263 nm; 8 ps; A-X transition; Cu; Cu plate; LiYF/sub 4/:Nd; N; Vegard-Kaplan system; atomic nitrogen; cryogenic temperature; excited molecular nitrogen; excited species; laser ablation; laser ablation technique; laser irradiation; multi-photon absorption process; nitrogen solid films; picosecond-UV laser; ps laser photolysis; ps-laser irradiation; visible emissions; Atom lasers; Atomic beams; Cryogenics; Laser ablation; Laser excitation; Laser transitions; Nitrogen; Optical pulses; Solid lasers; Vacuum technology;
Conference_Titel :
Lasers and Electro-Optics Europe, 2000. Conference Digest. 2000 Conference on
Conference_Location :
Nice
Print_ISBN :
0-7803-6319-1
DOI :
10.1109/CLEOE.2000.910068
