Observation of Femtosecond Laser-Induced Ablation in Crystalline Silicon  

Oleh:

Grigoropoulos, Costas P. ; Choi, Tae Y.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 126 no. 5 (Oct. 2004), page 723-726.
Topik: crystallization; observation; femtosecond; laser - induced; ablation; crystalline silicone

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.9 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

The ablation of crystalline silicon by ultrashort laser pulses is studied experimentally. A pump - and - probe experiment is implemented in a collinear arrangement, utilizing a time-delayed frequency - doubled probe beam for in situ reflectance measurement and ultrafast microscopy observation. Enhanced surface reflectivity in sub -picosecond time scale at the center of the irradiated spot indicates nonthermal liquid layer formation. A short-lived nonthermal liquid phase was detected at fluence of 1.5 J / cm(2). In addition to this observation, the reflected images for pump beam fluences ranging from 1.5 to 4.6 J / cm(2) provide evidence of plasma expansion above the irradiated target.

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