Liquid Atomization Induced by Pulse Laser Reflection underneath Liquid Surface
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概要
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We observed a novel effect of pulse laser reflection at the interface between transparent materials with different refractive indices. The electric field intensity doubles when a laser beam is completely reflected from a material with a higher refractive index to a material with a lower index. This effect appreciably reduces pulse laser ablation threshold of transparent materials. We performed experiments to observe the entire ablation process for laser incidence on the water–air interface using pulse laser shadowgraphy with high-resolution film; the minimum laser fluence for laser ablation at the water–air interface was approximately 12–16 J/cm2. We confirmed that this laser ablation occurs only when the laser beam is incident on the water–air interface from water. Many slender liquid ligaments extend like a milk crown and seem to be atomized at the tip. Their detailed structures can be resolved only by pulse laser photography using high-resolution film.
- 2009-05-25
著者
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Nagayama Kunihito
Department Of Aeronautics And Astronautics
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Nakahara Motonao
Department Of Computer And Communication Faculty Of Engineering
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Nagayama Kunihito
Department of Aeronautics and Astronautics, Faculty of Engineering, Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Kajiwara Takashi
Department of Applied Physics, Graduate School of Engineering, Tohoku University
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Nishiyama Takashi
Department of Aeronautics and Astronautics, Faculty of Engineering, Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Utsunomiya Yuji
Department of Aeronautics and Astronautics, Faculty of Engineering, Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Kubota Shiro
Research Core for Explosion Safety, National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa, Tsukuba, Ibaraki 305-8569, Japan
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Kajiwara Takashi
Department of Aeronautics and Astronautics, Faculty of Engineering, Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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Nakahara Motonao
Department of Communication and Computer Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-Higashi, Higashi-Ku, Fukuoka 811-0295, Japan
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Nakahara Motonao
Department of Computer and Communication Engineering, Faculty of Engineering, Fukuoka Institute of Technology, Wajiro, Higashi-ku, Fukuoka 811-0295, Japan
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NISHIYAMA Takashi
Department of Aeronautics and Astronautics, Faculty of Engineering, Kyushu University
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