Controllable photoinduced optical attenuation in a single-mode optical fiber by irradiation of a femtosecond pulse laser

2004 ◽  
Vol 29 (23) ◽  
pp. 2728 ◽  
Author(s):  
Yusuke Himei ◽  
Jianrong Qiu ◽  
Sotohiro Nakajima ◽  
Akihiko Sakamoto ◽  
Kazuyuki Hirao
Keyword(s):  
Optical Fiber ◽  
Pulse Laser ◽  
Femtosecond Pulse ◽  
Single Mode ◽  
Femtosecond Pulse Laser ◽  
Single Mode Optical Fiber ◽  
Optical Attenuation

345 Developing a measurement technique of micro bubbles and droplets using an Optical Fiber Probe processed by Femtosecond Pulse Laser

2008 ◽  
Vol 2008.8 (0) ◽  
pp. 89-90
Author(s):  
Yusuke OZAWA ◽  
Keisuke MATSUDA ◽  
Shingo OISHI ◽  
Shin-ichiro AOSHIMA ◽  
Toshiyuki SANADA ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Pulse Laser ◽  
Measurement Technique ◽  
Femtosecond Pulse ◽  
Fiber Probe ◽  
Femtosecond Pulse Laser ◽  
Optical Fiber Probe

Nonlinear dynamics of femtosecond pulse propagation through single-mode optical fiber

1988 ◽  
Author(s):  
E. M. DIANOV ◽  
A. B. GRUDININ ◽  
D. V. KHAIDAROV ◽  
D. V. KOROBKIN ◽  
A. M. PROKHOROV ◽  
...  
Keyword(s):  
Nonlinear Dynamics ◽  
Optical Fiber ◽  
Femtosecond Pulse ◽  
Pulse Propagation ◽  
Single Mode ◽  
Single Mode Optical Fiber

Nonlinear dynamics of femtosecond pulse propagation through single mode optical fiber

1989 ◽  
Vol 8 (1) ◽  
pp. 61-69 ◽  
Author(s):  
E. M. Dianov ◽  
A. B. Grudinin ◽  
D. V. Khaidarov ◽  
D. V. Korobkin ◽  
A. M. Prokhorov ◽  
...  
Keyword(s):  
Nonlinear Dynamics ◽  
Optical Fiber ◽  
Femtosecond Pulse ◽  
Pulse Propagation ◽  
Single Mode ◽  
Single Mode Optical Fiber

Bubbles and Droplets Measurement via Optical Fiber Probe Processed by Femtosecond Pulse Laser

2008 ◽  
Author(s):  
Takayuki Saito ◽  
Yusuke Ozawa ◽  
Keisuke Matsuda ◽  
Shin-Ichiro Aoshima
Keyword(s):  
Light Intensity ◽  
Optical Fiber ◽  
Pulse Laser ◽  
Simultaneous Measurement ◽  
Femtosecond Pulse ◽  
Detection Characteristic ◽  
Fiber Probe ◽  
Femtosecond Pulse Laser ◽  
Optical Fiber Probe ◽  
Reflected Light

An optical fiber has interesting and useful characteristics, which are able to be applied to scientific measurement. Its phase detection characteristic based on refraction difference between two phases is applied to bubbles/droplets measurement. Recently, demands for measurement of tiny bubbles/droplets increase in research fields of steam injectors, sprays, automotive engines, fine chemical reactors, and so on. Meanwhile, laser science and engineering, particularly femtosecond pulse laser, has made remarkable advances lately. Their unique properties of the interaction between the femtosecond pulses and materials can be utilized for microfabrication. The optical fiber probe methods have been repeatedly improved in order to measure bubbles/droplets efficiently and reliably in gas-liquid two-phase flows. However, one has been taking it for granted that simultaneous measurement of their diameters and velocities needs at least two optical fiber probes. To break through this situation, we newly developed a Single-Tip Optical Fiber Probe (F-STOP) microfabricated by femtosecond pulse laser (fs-pulses) which realizes simultaneous measurement of diameters and velocities of tiny bubbles/droplets. In the F-STOP measurement, the following properties are used to realize the simultaneous measurement of diameters and velocities of bubbles/droplets: the relation between the reflected-light intensity at the wedge-shaped probe tip and the tip-surface area covered with a phase; reflected-light intensity at the groove microfabricated by fs-pulses. The first aim of the present study is to provide data for evaluation of the influences of surface tension and wettability on the bubble measurement in order to develop precise and reliable F-STOP method. The second aim is to describe the process to make F-STOP via fs-pulses. The third aim is demonstration of the newly developed probe in real measurement of bubbles/droplets. On the basis of these, the performance of the new probe is discussed.

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