For realizing high speed and slim data link in a multimedia device, we have developed a compact and highly flexible
optical link module utilizing a polymer optical waveguide. With this module, 1.25Gbps high speed data transmission has
been successfully demonstrated. This module has a transmitter and a receiver and those are compactly packaged on the
each end of a film optical waveguide in order to provide easy electrical connection to board. This electric connection
configuration achieves more compact connector to the electric circuit board than the conventional configuration based on
the connection with optical connector. For the flexible optical link module, the highly bendable polymer film optical
waveguide has been developed by utilizing the unique replication technology. The propagation loss of the optical
waveguide is 0.07dB/cm at 850nm. And the bending loss is <0.2dB after 1million cycles at the bending radius 1mm.
These performances promises the practical application of the board to board data link through hinge of multimedia
device.
In this paper, we report the fabrication of a neodymium-doped Gd3Ga5O12 (Nd:GGG) film and neodymium, chromiumcodoped Gd3Ga5O12 (Nd,Cr:GGG) film to realize a self Q-switched laser grown upon Y3A15O12 (YAG) substrate by pulsed laser deposition (PLD) method. Consequently, epitaxial films have been grown.
The Nd3+, Cr4+ co-doped GGG epitaxial thin films for self Q-switched waveguide laser has been fabricated by a two-target pulsed laser deposition (PLD) method. The concentrations of Nd and Cr ion in the co-doped GGG thin films are well controlled by changing respective KrF laser ablation fluence and repetition rate for Nd:GGG and Cr,Ca:GGG sintered targets. The structure of Nd,Cr:GGG thin films on YAG substrate shows a planar waveguide structure with high numerical aperture. It is confirmed that Nd3+ and Cr4+ ions are optically active as laser active ions and saturable absorbers respectively at 1.06 micrometer to be used for monolithic self-Q-switched waveguide laser to generate high peak power and short pulse output.
The Nd3+,Cr4+ co-doped GGG epitaxial thin films for self Q-switched waveguide laser has been fabricated by a two-target pulsed laser deposition method. Concentrations of Nd and Cr ion in Nd,Cr:GGG thin films are well adjusted by changing laser ablation fluences independently for Nd:GGG and Cr,Ca:GGG sintered targets. The structure of Nd,Cr:GGG thin films on YAG substrate shows a planar waveguide structure. It is confirmed that Nd3+ and Cr4+ ions are optically active as laser active ions and saturable absorbers around 1.06 micrometers .
A xenon multiple exposure light source device was manufactured to record the trajectory of a flying javelin, and a wind tunnel experiment was performed with some javelin models to analyze the flying characteristics of the javelin. Furthermore, form of javelin throwing by athletes was recorded to estimate the characteristics in the form of each athlete using a high speed cameras.
As a shot of shot-put is heavy and the flying velocity of the shot is small, the influence of air resistance on the trajectory of the shot is negligible. Thus, we can easily calculate the trajectory and the projected range of the shot from the position and the velocity of the shot just after it is released from the hand of a shot-putter. By measuring the 3D movement and trajectory of each part of the shot- putter's body. The time dependence of the force given to the shot is obtained and the capacity for locomotion of the shot-putter can be estimated quantitatively. In this paper, high-speed photography recording of shot-put is performed on the student shot-putters of Tokai University and their playing ability is estimated from the time dependence of the force given to the shot obtained by analyzing the recorded images.
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