Enhancement of Luminescence Efficiency of YO Nanophosphor via Core/Shell Structure.

We successfully fabricated YO:RE (RE = Eu, Tb, and Dy) core and core-shell nanophosphors by the molten salt method and sol-gel processes with YO core size of the order of 100~150 nm. The structural and morphological studies of the RE-doped YO nanophosphors are analyzed by using XRD, SEM and TEM techniques, respectively. The concentration and annealing temperature dependent structural and luminescence characteristics were studied for YO:RE core and core-shell nanophosphors.

Engineering of TeO-ZnO-BaO-Based Glasses for Mid-Infrared Transmitting Optics.

In this paper, the glass systems, TeO-ZnO-BaO (TZB), TeO-ZnO-BaO-NbO (TZB-Nb) and TeO-ZnO-BaO-MoO (TZB-Mo), were fabricated by the traditional melt-quench protocol for use as mid-infrared (mid-IR) transmitting optical material. The effect of NbO and MoO on the key glass material properties was studied through various techniques. From the Raman analysis, it was found that the structural modification was clear with the addition of both NbO and MoO in the TZB system.

Unravelling interrelations between chemical composition and refractive index dispersion of infrared-transmitting chalcogenide glasses.

A facile procedure for compositional screening of chalcogenide glass (CG) is proposed to manage its infrared transmission edge (ω) as well as refractive index dispersion (ν) in the long-wavelength infrared (LWIR) range. Both ω and ν of CG turn out to be interpretable simply in connection with its chemical composition based on a postulation that CG behaves as a single average harmonic oscillator (SAHO). In this SAHO model, ω is expressed as a function of molar mass and average bond energy, both of which are easily accessible for a given CG composition.

Photomechanical effect on Type I collagen using pulsed diode laser.

Background: As the most abundant protein in human tissues, the use of collagen is essential in the fields of biological science and medicine.

Objective: The aim of this study is to investigate the mechanical effect of pulsed laser irradiation on collagen tissue.

Methods: With various laser parameters such as peak power, pulse width, and repetition rate, the induced stresses on samples were measured and analyzed.

Development of multi-colored LED system for therapeutic application.

Background: The evaluation and control of lighting is crucial in physiological, biomedical, and industrial fields. Many kinds of lighting techniques based on LED have been developed due to its advantages.

Objective: The aim of this study is to develop the multi-colored LED system for healing purposes.

A new optical technique to monitor joint motion using position sensitive detector.

Background: Evaluation of joint movements is essential to choose an appropriate rehabilitation protocol for a patient.

Objective: The aim of this study is to suggest an alternative optical technique for measurement of joint angle which is convenient, inexpensive, and can be operated in real time.

Methods: According to the principle of the triangulation method, position sensitive detector (PSD) converts reflected light signals into distance-related voltages.

Development of an optical fiber sensor for angular displacement measurements.

For diagnostic and therapeutic purposes, the joint angle measurement of a patient after an accident or a surgical operation is significant for monitoring and evaluating the recovering process. This paper proposed an optical fiber sensor for the measurement of angular displacement. The effect of beveled fiber angle on the detected light signal was investigated to find an appropriate mathematical model.