检索

中国激光
激光与光电子学进展
Chinese Optics Letters
光学学报
光子学报
应用激光
应用光学
强激光与粒子束
量子光学学报
激光杂志
激光与红外
激光生物学报
激光技术
红外与激光工程
光学与光电技术
光学 精密工程
光学技术
光散射学报
光谱学与光谱分析
光电子技术
光电工程
发光学报
半导体光电
红外与毫米波学报
量子电子学报
原子与分子物理学报
Chinese Journal of Lasers B
中国激光医学杂志
强激光技术进展
大气与环境光学学报
高功率激光及等离子体物理研究论文集(专题)
现代科学仪器
光学仪器
光电子.激光
液晶与显示
红外
红外技术
光通信研究
半导体光子学与技术
High Power Laser Science and Engineering
Frontiers of Optoelectronics
Photonics Research
太赫兹科学与电子信息学报
Matter and Radiation at Extremes
Advanced Photonics
Opto-Electronic Advances
Journal of Innovative Optical Health Sciences
光通信技术
International Journal of Extreme Manufacturing
人工晶体学报
无机材料学报
Journal of Semiconductors

Hi,您目前在 全部期刊 期刊中, 论文搜索关键字 and Laser Optics ,共找到 66 个内容。
选择下列全部论文 将 选定结果
Early Posting
Li Xun  Li Ming  Liu Hongjun  
收起
摘要
We propose an effective way to achieve enhanced optical absorption surface of Ti7 fabricated by femtosecond (fs) laser assisted with airflow pressure. The effect of laser scanning speed and laser power on the surfaces’ morphology and average reflectivity was studied. In order to further reduce the surface’s reflectivity, different airflow pressure was introduced during the fabrication of Ti7 by fs laser. Furthermore, the average reflectivity of samples fabricated under different laser parameters assisted with airflow was presented. In addition, the high and low temperature tests of all samples were performed to test the stability performance of the hybrid micro/nano structures in extreme environment. It is demonstrated that the airflow pressure has an important influence on the micro/nano structures for light trapping, the average reflectivity of which could be as low as 2.31% over a broad band of 250nm-2300 nm before high and low temperature test, and the reflection for specific wavelengths can go below 1.5%.
Chinese Optics Letters
2021, 19(9):
Early Posting
摘要
The population trapping effect of 3F4 level is an important factor limiting the power scaling of 2.3 μm thulium laser on the 3H4→3H5 transition. In this letter, we demonstrate a novel scheme of GSA (3H6→3H4) and ESA (3F4→3H4) dual-wavelength pumped 2.3 μm thulium laser. Introducing an ESA pumping process can accurately excite the Tm3+ ions accumulated in the 3F4 level to the 3H4 level, constructing a double populating mechanism for the upper laser level 3H4. A proof-of-principle experimental demonstration of GSA (785 nm) and ESA (1470 nm) dual-wavelength pumped 2.3 μm Tm:YLF laser was realized. A maximum continuous-wave output power of 1.84 W at 2308 nm was achieved under 785 and 1470 nm dual-wavelength pumping, increased by 60% compared with the case of 785 nm single-wavelength pumping under the same resonator condition. Our work provides an efficient way to achieve higher output power from 2.3 μm thulium-doped laser on the 3H4→3H5 transition.
Chinese Optics Letters
2021, 19(9):
Early Posting
摘要
We report a high-power fiber amplifier based on nonlinear chirped-pulse amplification (NCPA). To manage the nonlinearity, pulse shaping is introduced by the self-phase-modulation (SPM) in the fiber stretcher with the help of spectral filtering. The third-order dispersion is compensated by the nonlinear phase shift in the NCPA. With optimization, the system can output 382 fs pulse duration with 20 W average power at 1MHz repetition rate. The long-term average power fluctuation is measured to be 0.5% (RMS) in 24 hours, and the beam quality factor (M2) is 1.25.
Chinese Optics Letters
2021, 19(9):
Early Posting
摘要
Herein, a stable noise-like (NL) mode-locked Tm-doped fiber laser (TDFL) relying on nonlinear loop mirror (NOLM) was experimentally presented. Different with the previous NL mode-locked TDFL with NOLM, entire polarization-maintaining fiber construction was utilized in our laser cavity, which makes the oscillator with a better resistance of environmental perturbations. The robust TDFL can deliver stable bound-state NL pulse with pulse envelope tunable from ~14.1 ns to ~23.6 ns and maximum pulse energy of ~40.3 nJ at repetition rate of ~980.6 kHz. Meanwhile, the all PM-fiber laser shows a good power stability (less than ~0.7%) and repeatability.
Chinese Optics Letters
2021, 19(9):
Early Posting
摘要
Abstract In this paper, we report a passively mode-locked Nd:YSAG laser using a PPLN superlattice. Nonlinear mirror mode locking based on periodically poled LiNbO3 intracavity frequency doubling was theoretically analyzed. The modulation depth of nonlinear reflectivity of the nonlinear mirror is approximately 8.8%. Optical performances of the mode locked laser including output power, RF spectrum, and optical spectrum were experimentally investigated. An average output power of 710 mW with slope efficiency of 14.6% was obtained at pump power of 6.5 W. The repetition rate is 101.7 MHz, and signal-to-noise ratio of mode locked pulse is 45 dB. The mode-locked pulse width was approximately 9 ps.
Chinese Optics Letters
2021, 19(9):
Early Posting
摘要
We report on diode-pumped continuous-wave Pr:YLF laser and its frequency doubling to 320 nm. Maxiumum output power of the 640-nm fundamental wave reached 3.44 W with a slope efficiency of about 48.3%. Using a type-I phase matched LBO crystal as frequeny doubler, we have achieved a 320-nm ultraviolet radiation with a maximum output power of 1.01 W, which is the highest power that ever reported under diode pumping, to the best of our knowledge.
Chinese Optics Letters
2021, 19(9):
Early Posting
摘要
The influence of nodule defects on the characteristics of femtosecond laser-induced damage has not been fully investigated. In this study, two types of 800 nm/1064 nm dual-band HfO2/SiO2 high-reflection films with different configurations were analyzed. Combined with finite-difference time-domain (FDTD) electric field simulation and focused ion beam (FIB) analysis, the initial state and growth process of femtosecond laser damage of nodules were explored. In particular, the sequence of blister damage determined by the film design and the inner damage caused by nodules were clarified. The rule of the laser-induced damage threshold (LIDT) of different nodule sizes was obtained. The difference in the damage behavior of nodules in the two types of film was elucidated.
Chinese Optics Letters
2021, 19(8):
Early Posting
摘要
We propose a design of single-mode orbital angular momentum (OAM) beam laser with high direct-modulation bandwidth. It’s a microcylinder/microring cavity interacted with two types of second-order gratings: the complex top grating containing the real part and the imaginary part modulation and the side grating. The side grating etched on the periphery of the microcylinder/microring cavity can select a whispering gallery mode with a specific azimuthal mode number. While the complex top gratings can scatter the lasing mode with travelling-wave pattern vertically. With the cooperation of the gratings, the laser works with a single mode and emits radially polarized OAM beams. With an asymmetrical pad metal on the top of the cavity, the OAM on-chip laser can firstly be directly modulated with electrical pumping. Due to the small active volume, the laser with low threshold current is predicted to have a high direct modulation bandwidth about 29 GHz with the bias current of ten times the threshold from the simulation. The semiconductor OAM laser can be rather easily realized at different wavelengths such as the O band, C band and L band.
Chinese Optics Letters
2021, 19(8):
Early Posting
Xue Jiayun  Gao Hui  Zhang Nan  Sun Lu  [ ... ]Lin Lie  Liu Weiwei  
收起
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
As one of the greatest inventions in the 20th century, ultrafast lasers have offered new opportunities in the areas of basic scientific research and industrial manufacturing. Optical modulators are of great importance in ultrafast lasers, which directly affect the output laser performances. Over the past decades, significant efforts have been made in the development of compact, controllable, repeatable as well as integratable optical modulators (i.e., saturable absorbers). In this paper, we firstly review the fundamentals of the most widely studied saturable absorbers including semiconductor saturable absorber mirrors and low-dimensional nanomaterials. Then, different fabrication technologies for saturable absorbers and their ultrafast laser applications in a wide wavelength range are illustrated. Furthermore, challenges and perspectives for the future development of saturable absorbers are discussed and presented. The development of ultrafast lasers together with the continuous exploration of reliable saturable absorbers will open up new directions for the mass production of the next-generation optoelectronic devices.
Chinese Optics Letters
2021, 19(8):
00 11