Excitation of the ultrahigh-order modes are implemented by employing the free-space coupling technique.

In this paper,a novel electro-optic modulator based on free space coupling technology is proposed.

A novel method to stretch light pulses is proposed by using the free-space coupling technique,with which the ultrashort laser pulses can excite ultrahigh-order modes in the symmetrical metal-cladding optical waveguide with sub-millimeter scale.

Developments of free-space quantum key distribution;

Study on quantum key bit rate in free-space quantum cryptography;

Developments of free-space quantum cryptography;

Key techniques of free space laser communication;

The design of optical free space communication system with the optical fiber coupling system;

Spectral and temporal properties of spatially and spectrally partially coherent Gaussian Schell-model pulsed beams in free space;

Analysis of The Spatial Coupling of Natural Resource And Economy in Small Upland Drainage Area ——Taking Small Upland Drainage Area of Anji Country of Chekiang Province as Object The spatial coupling of natural resource and economy was studied in small upland drainage area of Anji country.