L01: Photonic Crystal and Its Application
Leader:Prof. Zhi-Yuan Li
Members:  Daozhong Zhang   Baohua Feng   Dongxiang Zhang   Honglian Guo
Progresses Achieved:
  • Direct coupled and channel drop filters with 4 outlets have been respectively designed and fabricated The minimum wavelength interval is 2nm. 

  • We proposed a method, by which continuously tunable reciprocal vector can be achieved in nonlinear photonic crystals. Tunable second harmonic between 1180 and 1310 nm has been observed.

  • Ultrafast all optical switch with a response less than 20 fs has been realized in 3D polystyrene photonic crystals.

  • The interaction between microtubule and microtubule associated protein has been measured by optical dual tweezers. Measurement method for the interaction of non-coding RNA and protein has been studied.

  • Our theoretical and experimental studies show that imaging in a metallic photonic crystal lens can precisely satisfy the conventional law between the image and object distance and that 3D negative refraction and imaging can be realized in an optical inverse-opal photonic crystal.

  • We design, build, and characterize 3D “log-pile” photonic crystals and functional elements in the microwave regime.

  • We investigate surface plasmon resonance, extraordinary transmission, and local field enhancement in metallic nanoparticles and nanostructures.

  • We explore near-field scanning optical microscopy to investigate light propagation in photonic crystal functional elements.

 
 


 
 
L03:Design, Laser Manufacturing, and Properties of Low Dimensional Oxide Materials
Leader:Prof. Kuijuan Jin
Members: Guozhen Yang     Huibin Lu    Meng He    Can Wang    
Haizhong Guo        
Progresses Achieved:
  • We observed picosecond ultrafast photoelectric effects in SrTiO3 and LaAlO3 single crystals for the first time, and observed magneto-electric double modulation effects in oxide multilayers.
  • Theoretically analyzed the corresponding mechanism for the magneto-electric double modulation effects in oxide multilayers and revealed the importance of the interface effect on those properties.
  • The Oblique Incidence Reflectivity Differences technique (OIRD) has been employed to study the mechanism of film growth in the experiments. The first OIRD microscope of China has been set up to analyze the interactions of biomolecules primarily.
  • Two kinds of metallic nanocluster/oxide composite materials has been made with large nonlinear optical properties.The highest third-order nonlinear optical susceptibility χ(3) reached 1.1x10-7esu with picosecond response.

 
 
L04:THz and Ultrafast Optical Spectroscopy
Leader:Prof. Li Wang 
Members: Panming Fu    Lingan Wu    Bingbing Wang    
Progresses Achieved:
  • A generalized phase-conjugate multi-wave mixing is proposed for the first time. We studied the autoionizing Rydberg states of Ba by six-wave mixing, in which shake-up process due to the electron-electron Coulomb repulsion was observed.

  • Subwavelength two-photon interference with two independent pseudothermal sources was observed for the first time.

  •  Based on the time correlation of entangled photons absolute self-calibration of the quantum efficiency of single-photon detectors has been demonstrated for the first time.

  • Using THz-TDS method we studied the formation and propagation of the surface plasmon polariton wave in 2-D and 3-D meta-materials with sub-wavelength featured structures at THz frequency, in which some abnormal phenomena were observed.

  • Based on nonperturbative QED, a frequency-domain theory of high-order above-threshold ionization (ATI) is proposed. The relativity effects in high-order ATI has also been studied.

  •  We improved significantly the pump-probe system, which was employed to study the ultrafast dynamical processes in LCCO and GBCO superconductor thin-films.


 
 
L05:High Energy Density Physics at Ultra-Intense Laser Interaction with Matter
Leader:Prof. Jie Zhang
Members:   Zhengming Sheng    Liming Chen  Xin Lu    Yutong Li    Quanli Dong
   Jinglong Ma
Progresses Achieved:

The fundamental physical processes related with fast ignition, laser-based advanced electromagnetic radiation and particle sources, femtosecond laser pulse propagation in air and other important subjects have been studied. Significant progress has been made.

  • A multi hundred TW femtosecond laser system and experimental platform have been built.

  • Fast electron beams emitted along the target surface have been observed, which directly confirm the fast electron guiding by a cone target in the intergraded fast ignition experiments. [Physical Review Letters, 96, 165003 (2006)]

  • The effect of relative phase and cross angle on the interaction characteristics of fs laser filaments in air was investigated for first time. [Physical Review Letters,96,025003 (2006)]

  • Measurement of self-induced electrostatic fields using the protons generated in intense laser-“cone-fiber” target interactions. [Physical Review Letters, 96, 084802 (2006)]

  • Independent entangled photon pairs from two synchronized but mutually incoherent laser sources. [Physical Review Letters, 96, 1105012006]

  • The modification of proton emission from target rear surface by shock waves is demonstrated experimentally.

  • The generation conditions of soft x-ray laser pumped by grazing incident scheme have been studied.

  • The triggering and guiding of long gap static high voltage discharge and working frequency (50Hz) high voltage discharge have been demonstrated for first time.

  • A theory for producing powerful single cycle THz pulses have been proposed, providing a new way to generate high power THz emission.

  • A theory is proposed to generate quasi-monoenergetic electron bunches by use of wire and slice targets, which is verified by numerical simulations.

  • A theory is proposed for shock wave acceleration of protons in laser interaction with solid targets.

Significant progresses have been made on the development of simulation codes: the Fokker-Planck and particle-in-cell codes.
 


 
 
L07:Ultrashort Laser Pulse and Frequency Metrology
Leader:Prof. Zhiyi Wei
Members: Yuxin Nie    Dehua Li    Hao Teng
  Taihua Wang
Progresses Achieved:

We estabilished an ultraintense femtosecond Ti:sapphire laser facility, peak power of higher than 350TW was generated. By collaborated with the Chinese University of Science and Technology, we realized the synchronized entangle photons for the first time in the world. A 7fs Ti:sapphire laser with repetition rate of larger than 300MHz was domenstrated, which is the highest repetition rate for sub-10fs laser up to now, the carrier envelope phase (CEP) was successfully measured based on the technology of difference frequency-generation. We also realized the first femtosecond optical parameterial oscillator domestically, tunable signal laser wavelength from 1190 to 1228nm was obtained, the maxium power is higher than 100mW and the typical pulse duration is 262fs. In additional, we developed an series of all-solid-state lasers, laser wavelngths at 1.5micrometer, 942nm, 916nm and 912nm were obtained from Cr:YAG, Nd:GSAG, Nd:LuVO4 and Nd:GdVO4 laser respectively. ps mode-locking laser pulses at average power 20mW was generated. A semicconductor laser with grating feedback and drive electronics were initially established, the linewidth is less than 1MHz. With a self made laser interfereometer, we also demomstrated a measurement accuracy of 0.1nm by combined a ATM.
 

 

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Key Laboratory of Optical Physics
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