Session Index

The recent observations of gravitational waves by the LIGO and Virgo collaboration have made a impact on physics and astronomy dramatically. A world wide observation with global gravitational wave network will be expected to play a significant role in the unknown of the sources with the follow-up observational telescopes.

 

We successfully fabricate GaN based VCSELs with high contrast grating (HCG) reflectors for the first time. The HCG parameters, such as periods, duty cycles, are designed to fit the best to the microcavity parameters. The measurement results unambiguiosly show the room temperature lasing action with a fix polarization direction.

 

We proposed a way to utilize Bragg degeneracy in position servo technology. With simulations of Bragg degenerate effect under different conditions of system, experiments are applied to demonstrate the feasibility of the concept. A reference beam modulated as cylindrical wave successfully realize the location detecting technology base on Bragg degeneration.

 

In holographic-data-storage system, phase coding signal is superior for amplitude coding, because it can make the M/# consumption effective. However, disc misalignment in the reading process will reduce the quality of the image. We promote a one-shot decoding module called double-frequency-grating based shearing interferometry(DFGSI) to improve this situation.

 

We present a wavelength coded volume holographic gratings (VHGs) based fluorescence microscopy to obtain dual wavelength fluorescence images of a biological samples in one shot. Furthermore, the system uses the HiLo image processing to suppress the out of focus signal. Experimental results demonstrate the fluorescence images of the system.

 

We proposed and demonstrated two photoalignment-based methods to control the orientational of optical diffractions made by cholesteric liquid crystal (CLC) fingerprint gratings. By operating the off-axis linearly green polarized light, the 1D CLC fingerprint grating can be produced. The CLC grating can be continuously rotated to achieve 2D grating diffraction.

 

Due to discrepancy of valence-band symmetry in wurtzite ZnO, we investigate the mechanism of optical amplification, i.e. stimulated emission, for ten-pairs a-plane ZnO/ZnMgO multiple quantum well grown on r-plane sapphire by pulsed-laser deposition, revealing the apparent anisotropism of threshold and optical gain.