The cardinal challenge for implementations of optics or more advanced nanooptics in water is that the natural water is largely dissipative for the light, due to intrinsic absorption of water itself and the scattering of microscopic particles suspending inside. The optical power can be quickly depleted in a much shorter distance, in comparison with the case of free space. So our research goal on the fundamental side is to reduce optical losses in the propagation paths or interaction volumes. On the application side, we aim to develop in-situ optical imaging, measuring and sensing technologies for hydrodynamics and ocean engineering.