Transformation optics which relies on the formal invariance of Maxwell’s equations under a spatial coordinate transformation, plays important roles in various branches of modern optics and technical application by providing schemes to tailor electromagnetic fields into desired spatial patterns. The concept development of transformation optics was reviewed and a briefly introduction was provided for the physical principles of transformation optics. Typical applications were discussed including invisibility cloaking, illusion optics and waveguiding and extensions on the manipulation of sonic waves, heat flows and quantum waves. Potential future developments of the concepts and applications of transformation optics were also discussed.

All solid-state Raman lasers have attracted great attention for various applications in the areas of medicine, biomedicine, optical communication, environmental control, and so on, due to their advantages such as simple, robust, efficient, and versatile. And solid-state Raman laser can offer good beam quantity, flexible wavelength in the infrared and visible spectral ranges by simply choosing different crystals in combination with frequency doubling technology. An overview of solid-state Raman lasers was present, and then our research work was highlighted in Nd:YVO4 solid-state laser using BaWO4, SrWO4 and YVO4 as the Raman medium in continuous operation and eye-safe quasi-continuous operation. At last the future development trends of solid-state Raman lasers were discussed.

Single-longitudinal-mode Q-switched laser sources are widely used in various fields such as precision measurements. The fiber laser is one of new-generation solid-state laser with many excellent properties. Recently lots of techniques for single-longitudinal-mode Q-switched fiber lasers were rapidly developed. The operation principles, current available techniques and possible development trends of fiber lasers for single-longitudinal-mode Q-switched pulses, including both introducing the Q-switch into the single-longitudinal-mode fiber laser and injecting a single-longitudinal-mode laser seed into the Q-switched fiber laser, are comprehensively overviewed.

Cylindrical vector beam (CVB) including radially polarized and azimuthally polarized beam has drawn great attention because of their unique features in intensity and electrical distributions which are applied in variety of area such as plasmon excitation, optical tweezers and high-resolution metrology. Few-mode fibers are used to generate CVB due to their second order eigenmodes, TM01 and TE01 are exactly of radial and azimuthal polarization. Methods of all-fiber laser generating CVB based on few-mode fiber Bragg grating (FMFBG) are introduced.

As a new kind of artificial materials, metamaterials have attracted wide attention, because they can present special properties which not exist naturally or hard be realized. Based on the quantized method of the LC circuit model, our group has studied the elementary excitation in metamaterial and introduced its “quasi-particle”. By using the two-photon inference, the quantum property of metamaterial and the correctness of the quantized method were proved. This quantized method was further used to investigate the interaction between metamaterial and active material, and the amplification by the stimulated emission radiation can be found in this system. These results show that metamaterials not only can steer the light in classical regime but also have a potential application in quantum optics.

Surface plasmon polaritons (SPPs), the electromagnetic fields propagating along the metal-dielectric interface, are regard as the promising candidate of the next photonic integrated circuits. Several metal slit structures based on the SPPs are summarized. By using the Fabry-Perot resonator effect, Fano resonance, and multimode interference, the SPP propagation could be controlled and modulated by these metal slit structures. As a result, a subwavelength unidirectional SPP generator, a submicron broad unidirectional SPP generator, submicron SPP splitters, nano-focusing devices, and submicron all-optical switches were realized in the metal slit structures. These nano-plasmonic devices have important applications in highly integrated photonics.

Bose-Einstein condensation (BEC) is the frontier research field of atomic and molecular physics. There have been dozens of groups which had obtained the BEC since the first BEC experiment was achieved successfully in 1995, a great number of dramatic results have been achieved. The quantum manipulation of the momentum Bose-Einstein condensate by means of super-radiant scattering is one of the promising research topics. The cold atom physics group of Peking University implemented serial experiments on Bose-Einstein condensation superadiant scattering since they achieved BEC in experiment from 2004. It introduces the related experiments on quantum manipulation of the momentum Bose-Einstein condensate by means of superradiant scattering.

Quantum network mainly consists of a memory used for storing and manipulating quantum information and an information carrier through which different memories can connect with others. Usually quantum information is encoded in a two-dimensional space of a photon, a robust information carrier. In this case, each photon can carry a bit of information. If the photon can live in a high-dimensional space, then the information carried by each photon could be increased significantly, the channel capacity of the network and the transmission efficiency would then be greatly enlarged. Moreover, storing high-dimensional states in quantum memory leads to significant improvements in storage capacity. After briefly introducing the progresses achieved at home and abroad, a significant breakthrough was reviewed towards the realization of high-dimensional quantum memories based on a cold atomic ensemble in detail, and some basic problems remaining were proposed which need to be solved to build the future quantum internet.

Quantum key distribution (QKD) is one of the most active research fields in quantum information science and technology. It can provide a method to generate a shared secret key between two distant parties, and has unconditional security guaranteed by physics laws even if the eavesdropper Eve has unlimited computational power and storage capacity. The unconditional security with the practical devices is an important problem in QKD research. The perfect secrecy of the one-time pad (OTP) and a model combining the OTP and the QKD are first introduced. The development of the unconditional security of the QKD is summarized. The emphasis is put on the quantum attack schemes based on practical systems and the corresponding countmeasures. The recent advances of the measurement device independent QKD (MDI-QKD) scheme are described in detail.

A scheme for implementing a three-qubit repetition quantum error-correction code with photon-spin interactions was presented. Polarizing beam splitters, photon detectors and micropillar cavities were used to realize quantum nondemolition measurement of the single spin, which are very important in quantum information processing. It is shown that this scheme is feasible in the current experimental technology.

Near-infrared quantum cutting is a promising approach to enhance the efficiency of silicon solar cells. There are many different kinds of rare earth elements, and each of them has abundant energy levels. Researchers prepare luminescent materials doped with rare earth elements, measure the absorption spectra, excitation spectra and emission spectra of the materials. According to these data, the quantum efficiency of luminescent materials was calculated. The Tb3 +-Yb3 + ion pair drawed people’s attention. Upon excitation of Tb3 + ion with a ultraviolet-visible photon, Yb3 + ion can emit two near-infrared photons around 1000 nm through cooperative energy transfer from Tb3 + ion to Yb3 + ion. The near-infrared photons can be absorbed by silicon solar cells. The quantum efficiency varies from concentration of Tb3 + /Yb3 + ions as well as the matrix of material.

Two-photon point spread functions of several tightly focused visible lasers were calculated based on the vectorial diffraction theory. The calculated result shows that the two-photon absorption region reduces with the decrease of laser wavelength. Femtosecond laser sources with visible wavelengths were employed to perform the two-photon polymerization fabrication, and the fabrication resolution and threshold were analyzed. The experimental results indicate that lower photon flux density leads to the improvement of fabrication resolution. The decrease of laser wavelength causes the two-photon transition to meet near resonance transition condition gradually, which further increases the two-photon transition probability and reduces the fabrication threshold.

Cavity-enhanced/ring-down spectroscopy is one of the most widely used spectroscopy techniques for the high sensitivity, real time, in-situ measurement of aerosol extinction coefficient. The nature suspended state of aerosol is not changed during the measurement. After nearly 30 years development, the techniques are well developed. The instrument based on cavity-enhanced/ring-down method was served as a standard instrument for the intercomparisons with other optical measurement instruments. The development and the application of cavity-enhanced/ring-down spectroscopy for aerosol extinction measurement were briefly reviewed.

Advances in 4H silicon carbide (4H-SiC) as a potential material for low-level ultraviolet (UV) radiation detection application at high-temperature, radiation hardened conditions are introduced. The latest progress in development of and the current state-of-art of different types of 4H-SiC-based UV photodetectors are reviewed. The approaches to improve the performances of the 4H-SiC-based photodetectors such as reducing the dark current and enhancing the photo responsivity are presented. The outlook for the development of 4H-SiC-based UV photodetectors are discussed.

All-reflection Fourier transform imaging spectrometer has important application in the fields of aerospace remote sensing etc. The specifical set of the cylindrical lens and collimation system causes the optical structure sophisticated and difficult in design, installation and maintenance. A structure without imaging lens was proposed to achieve the imaging spectral detection, which shows the feasibility of achieving imaging spectral detection. The spectral detection simulation experiments of wavelength 632.8 nm, 940 nm and 3000 nm show that it’s deviation of spectral measurement is less than 1%.

Spatial solitons were numerically studied in Kerr dual-periodic parity-time(PT) symmetric optical lattices. The bandgap structures of this optical lattices were obtained by using plane wave expansion method, and the phase transition point was obtained at the same time. The existence and stability of the spatial solitons were numerically studied in this optical lattices. The results showed that the stable range of the solitons located on different period waveguide is different.