Hwe Jong Kim

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Novel triangular ring resonators combining extremely small multimode-interference (MMI) coupler, low loss total internal reflection (TIR) mirrors, and semiconductor optical amplifiers are reported for the first time. The MMI length of 90 microm is among the shortest reported. The incidence angle of the TIR mirror inside the resonator is 22 degrees. A(More)
This paper reports the low-frequency reinforced ferroelectric acoustic actuators with high performances. In order to achieve a higher output sound pressure level and wider frequency response range, we have proposed the novel rubber/resin bi-layer acoustic diaphragm. From the simulated and measured frequency response results, the ferroelectric acoustic(More)
Hook interferometry is widely used for the measurement of atomic oscillator strengths and atomic energy level populations. The application of Fourier-transform techniques to the analysis of hook interferograms leads to greater precision in the determination of hook separations and is of particular benefit to the detection of small spatial population density(More)
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