Collision-induced timing jitter in dispersion-managed WDM soliton system with filtering

Taking into account the randomicity of collision positions and the arbitrary encoding of data in channel,the influences of different dispersion management on collision-induced timing jitter in a filtered wavelength division multiplexing (WDM) soliton system are obtained statistically and numerically by applying a set of coupled ordinary differential equations which are derived through variational procedure. The optimal dispersion managements which can greatly reduce the collision-induced timing jitter are found. The multi-channel collision-induced timing jitters in a filtered WDM soliton system are given with an optimal dispersion management and constant dispersion.     

10瓦级双包层光纤激光器

考虑到所用大功率激光二极管的光谱特性，对光纤激光器的基本法布里-珀罗腔型稍加改变，研制出激光二极管抽运的10w级双包层光纤激光器，获得最高功率为11．8w、波长1100mm的单模激光输出。     

PPLT倍频宽线宽掺镱双包层光纤放大激光

分别通过理论和实验研究了周期性极化的钽酸锂（PPLT）倍频宽线宽准连续掺镱双包层光纤放大激光.PPLT样品长为40 mm,极化周期为7.67 μm.基频光的中心波长为1064 nm,线宽约为6 nm.从基频光的光谱特性出发,利用超晶格倍频理论,解释了实验中获得的倍频温度与二次谐波功率之间的关系.在基频光的功率为2.2 W时,获得的宽线宽光纤激光倍频效率为1.8%.     

Sub-nanosecond strong pulse generated by backward Raman scattering

Hundreds picosecond strong short-wavelength pulses have been generate by a backward Raman oscillator amplifier pumped with a 10-J KrF laser from Heaven-1 MOPA system. Not only high power but also high energy laser pulses have been obtained with an energy conversion efficiency up to 17%. 640-picosecond pulse duration was observed in our experiments by a 1.5-GHz-bandwidth oscilloscope corresponding to 34 times of pulse compression rate.     

Continuous-wave and Q-switched performance of an Yb:YAG/YAG composite thin disk ceramic laser pumped with 970-nm laser diode

Using front face-pumped compact active mirror laser （CAMIL） structure, we have demonstrated an Yb：YAG/YAG composite ceramic disk laser with pumping wavelength at 970 nm. The laser has been operated in both continuous-wave （CW） and Q-switching modes. Under CW operation, laser output power of 1.05 W with 2% transmission output coupler was achieved at the wavelength of 1031 nm. Q- switched laser output was gotten by using an acousto-optic Q-switch. The repetition rate ranged from 1 to 30 kHz and the pulse width varied from 166 to 700 ns.     

改善高功率激光二极管阵列光束质量的一种新方法

根据波导模理论，推导了高功率激光二极管阵列的远场分布，根据其分布特点，设计了一种离轴外腔.运用这种外腔，在工作电流为17A时，光束的束宽积从自由运转时的1100mm·mrad减小到128mm·mrad，二极管阵列的光束质量提高了8.5倍左右，输出功率约为自由运转时的75%.     

113-W in-phase mode output from two ytterbium-doped large-core double-cladding fiber lasers

Phase locking for two ytterbium-doped large-core fiber lasers has been demonstrated by using a self- imaging confocal resonator with a spatial filter.Steady high-contrast interference stripes are observed. The visibilities of coherent and incoherent stripes are 59% and 6%,respectively.The measured width of the central strip is in good agreement with the calculated result.For in-phase mode,the output power of the phase-locked fiber laser array is up to 113 W and corresponding slope efficiency is 38.5%.     

激光表面纹理化过程中的Rayleigh-Taylor不稳定性

用表面纹理化的热模型 ,分析了固体表面的熔化和重固化的物理过程 ,计算了在纹理化过程中的表面温度、穿透深度、熔化深度、相面移动速度等物理量 ,提出了 Rayleigh-Taylor不稳定性形成周期化结构的机理。     

紫外准分子激光通过光纤传输触发低抖动球隙开关

本文研究了紫外XeCl准分子激光(308nm)在石英光纤中的传输特性.激光讯号通过光纤传输触发球隙开关的实验结果表明,激光触发的抖动时间小于3ns.用同一激光束通过两根光纤分别触发两个球隙开关,使两个球隙开关具有很好的同步特性.     

高压氢激发态之间的受激喇曼散射

本文采用非稳腔输出的XeCl准分子激光,首次观察到高压氢高激发态之间的受激喇曼散射,并讨论了它们产生的条件.