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Early Posting
Xue Jiayun  Gao Hui  Zhang Nan  Sun Lu  [ ... ]Lin Lie  Liu Weiwei  
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摘要
The spatial distribution of the forward-propagating amplified spontaneous emission (ASE) of nitrogen molecular ions during femtosecond laser filamentation in air is studied via numerical simulations. The results suggest that the divergence angle and signal intensity are extremely sensitive to the external focal length. Concurrently, we show that the optical Kerr effect plays a significant role in concentrating the directivity of ASE signals, particularly in cases of loose focusing. Furthermore, the simulations demonstrate that ASE signals are enhanced for a tight focus, although the corresponding filament length is shorter. The main physical mechanism underlying this process is the competition between the plasma defocusing and optical Kerr effects. The result is important for filamentation-based lidar applying to remote sensing.
Chinese Optics Letters
2021, 19(8):
Early Posting
摘要
Chalcopyrite Cu(In,Ga)Se2 (CIGS) thin films deposited in a low-temperature process (450 °C) usually produces fine grains and poor crystallinity. Herein, different Ag treatment processes, which can decrease the melting temperature and enlarge band gap of the CIGS films, were employed to enhance the quality of thin films in a low-temperature deposition process. It is demonstrated that both the Ag precursor and Ag surface treatment process can heighten the crystallinity of CIGS films and the device efficiency. The former is more obvious than the latter. Furthermore, the Urbach energy (EU) is also reduced with silver doping. This work aims to provide a feasible silver-doping process for the high-quality CIGS films in a low-temperature process.
Chinese Optics Letters
2021, 19(11):
Early Posting
摘要
Optical fibers have been widely applied to telecommunication, imaging, lasers, and sensing. Among the different types of fibers, photonic crystal fibers, also called micro-structured optical fibers, characterized by air holes arranged along the length of fibers have experienced tremendous advance due to the unique advantages. They are regarded as a desirable platform to excite surface plasmon resonance because of easy realization of phase matching conditions between the fundamental core mode and plasmonic mode, which plays a critical role in miniaturization and integration of surface plasmon resonance sensors. In this mini-review, the current status of photonic crystal fiber (PCF) sensors based on surface plasmon resonance (SPR) is summarized. The theory of SPR is discussed and simulation methods for PCF-SPR sensors are described. The important parameters including the refractive index detection range, resonance wavelength and spectral sensitivity responsible for the sensing properties of PCF-SPR sensors are reviewed. The fabrication and the comparison of performances are also illustrated and finally, the challenges and future perspectives are outlined.
Chinese Optics Letters
2021, 19(10):
摘要
An eco-friendly Zn(O,S) film with a wider band gap is emerging as one of the promising Cd-free replacement material, which can be deposited by radio frequency sputtering. The effect of sputtering pressure on the Zn(O,S) films properties and the devices performance are studied systematically. At high pressure, the ZnS phase is found in the Zn(O,S) films resulting in a higher barrier at Zn(O,S) /CIGS interface which would lead to a low recombination activation energy (Ea). By reducing sputtering pressure, single phase of Zn(O,S) films are conducive to carrier transport as well as promote the films electric properties, ultimately improving the performance of Zn(O,S)/CIGS solar cells.
Optoelectronics Letters
2019, 15(6): 435
Materials
摘要
Optoelectronics Letters
2018, 14(5): 363
摘要
An innovative formaldehyde gas sensor based on thin membrane type metal oxide of TiO2layer was designed and fabricated. This sensor under ultraviolet (UV) light emitting diode (LED) illumination exhibits a higher response to formaldehyde than that without UV illumination at low temperature. The sensitivities of the sensor under steady working condition were calculated for different gas concentrations. The sensitivity to formaldehyde of 7.14 mg/m3is about 15.91 under UV illumination with response time of 580 s and recovery time of 500 s. The device was fabricated through micro-electro-mechanical system (MEMS) processing technology. First, plasma immersion ion implantation (PIII) was adopted to form black polysilicon, then a nanoscale TiO2membrane with thickness of 53 nm was deposited by DC reactive magnetron sputtering to obtain the sensing layer. By such fabrication approaches, the nanoscale polysilicon presents continuous rough surface with thickness of 50 nm, which could improve the porosity of the sensing membrane. The fabrication process can be mass-produced for the MEMS process compatibility.
Optoelectronics Letters
2016, 12(4): 308
LI Bo-yan  ZHANG Yi  LIU Wei  SUN Yun  
收起
摘要
Cu(In,Ga)Se2 (CIGS) films are deposited on the Na-free glass substrate using three-stage co-evaporation process, and the effects of thickness and growth temperature on the orientation of CIGS film are investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). When the growth of CIGS film does not experience the Cu-rich process, the increase of the growth temperature at the second stage (Ts2 ) promotes the (112) orientation of CIGS film, and weakens the (220) orientation. Nevertheless, when the growth of CIGS film experiences Cu-rich process, the increase of Ts2 significantly promotes the (220) orientation. In addition, with the thickness of CIGS film decreasing, the extent of (In,Ga)2Se3 (IGS) precursor orientation does not change except for the intensity of Bragg peak, yet the (220) orientation of following CIGS film is hindered, which suggests that (112) plane preferentially grows at the initial growth of CIGS film.
Optoelectronics Letters
2012, 8(5): 348
Early Posting
摘要
An all-fiberized and narrow-bandwidth master oscillator power amplification (MOPA) system with 4 kW-level and slope efficiency of 78% is demonstrated. Tandem pumping strategy is tentatively introduced for thermally-induced mode instability (TMI) suppression. The stimulated Brillouin scattering effect is balanced by simply one-stage phase modulation technique. With different modulation signals, SBS limited output powers of 336 W, 1.2 kW and 3.94 kW are respectively achieved with spectral bandwidths account for 90% power of ~ 0.025, 0.17 and ~ 0.89 nm. Compared with our previously 976 nm pumping system, TMI threshold is overall boosted to be > 5 times in which tandem pumping increases the TMI threshold of > 3 times. The beam quality (M2 factor) of the output laser is well within 1.5 below the TMI threshold while it is ultimately saturated to be 1.86 with the influence of TMI at maximal output power. Except for SBS and TMI, stimulated Raman scattering (SRS) effect will be another challenge for further power scaling. In such a high power MOPA system, multi-detrimental effects (SBS, SRS, and TMI) will coexist and may be mutual-coupled, which could provide a well platform for further comprehensively investigating and optimizing the high power, narrow bandwidth fiber amplifiers
High Power Laser Science and Engineering
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