353 resultados para prism-waveguide coupler


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介绍了一种基于纳米粉末真空烧结技术的新型固体激光材料——Yb:Y2O3多晶陶瓷的制备工艺、物理化学特性、能级结构和光谱特性,并与Yb:YAG单晶进行了对比.采用紧凑型有源镜激光器(CAMIL)的抽运方式,验证了Yb:Y2O3透明陶瓷的激光输出性能.在35W的最大抽运功率下,得到波长1078nm,功率10.5w的连续激光输出,斜率效率达到37.5%.实验中还观察到激光输出波长随抽运功率增加而红移以及随输出耦合镜变化而漂移的现象.Yb:Y2O3多晶陶瓷是一种理想的激光材料,不仅具有与Yb:YAG单晶同样优秀的

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实验研究了激光二极管阵列(LDA)侧向抽运国产Nd∶YAG陶瓷棒的准连续及被动调Q激光输出特性。该陶瓷激光器采用LDA侧面紧密环绕均匀排布的抽运结构,陶瓷棒抽运区域长度为20 mm,其总尺寸为3 mm×35 mm,掺杂原子数分数为~1%。在千赫兹准连续运转条件下,当平-平谐振腔的输出耦合镜透过率为47.3%时,获得最大平均功率23 W的1064 nm激光输出,光束发散角为4.5 mrad,斜率效率达12%。在谐振腔内插入Cr4+∶YAG晶体作为被动调Q开关,成功地实现了陶瓷激光器千赫兹重复频率调Q激光脉冲输出,当Cr4+∶YAG晶体初始透过率为60%时,输出激光脉冲宽度(半峰全宽)可窄至14.5 ns,调Q动静比约为40%。

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研究了一种侧面抽运双包层光纤的方法,从被剥除了外包层、端面为350μm×400μm的D型双包层光纤内包层上切下长度为3mm的一段柱体,并胶合在相同的双包层光纤内包层的侧面上,构成了柱体-光纤侧面耦合器。半导体激光器的抽运光从该柱体的一端入射并通过它耦合进入双包层光纤的内包层,实验测得耦合器最大耦合效率为85%。该方法适用于输出功率为数瓦的光纤激光器和放大器的侧面抽运。

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对微棱镜与双包层光纤侧面耦合技术进行了研究。用光学胶把尺寸为1mm×1mm×1mm直角棱镜的直角面胶合在尺寸为330μm×170μm的内包层侧平面上,激光束以一定的角度从微棱镜的另一直角面入射并通过它耦合进入双包层光纤的内包层,实验测得耦合效率为86%。该方法可用于双包层光纤的侧面抽运。

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利用光纤-波导耦合器技术侧面泵浦一根4厘米长的短光纤,我们研制得到了一个红外波长的光纤激光器。该激光器的增益介质是横截面为矩形的掺钕磷酸盐玻璃光纤,其纤芯横截面尺寸为1.5×0.5 毫米,数值孔径为0.2。单横模激光可以通过该矩形光纤的增益-导引效应来获得。最大的激光输出功率为1.05瓦,斜率效率为10%。

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To optimize the performance of longitudinally pumped Yb^(3+):Y2O3 ceramic lasers, cavity parameters such as material length and output coupler transmission at a certain laser output power are calculated numerically using quasi-three-level laser model. The results show great potential of Yb^(3+):Y2O3 ceramics for highly efficient diode-pumped solid-state lasers.

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采用分步傅里叶变换作为数值模拟的方法,以二阶飞秒光孤子和基态飞秒光孤子为例,讨论了初始啁啾对光纤中传播的飞秒光孤子的时域特征和频谱结构的影响,概括出如下的结论:初始啁啾通过影响飞秒光孤子谱线的红移,而对飞秒光孤子由拉曼效应引发的脉冲延迟产生较大影响,正的初始啁啾使脉冲延迟加剧,负的初始啁啾使脉冲延迟减小。

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基于衍射理论和坐标变换,采用数值模拟的方法分析了硬边非稳腔平面波导激光器的光束特性,研究了存在非均匀抽运和增益饱和时,输出激光的光束质量.在端面抽运和边缘抽运时,比较了正支和负支非稳腔的输出光束特性.结果表明:利用优化的离轴硬边非稳腔可以得到近衍射极限的输出.在相同的抽运不均匀性情况下,对于边缘抽运和端面抽运,正支非稳腔的光束质量因子M^2分别为3.9和2.3,而相同条件下负支非稳腔的M^2因子为1.8和1.7.

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为了优化棱镜谐振腔在调Q状态下的运转特性,充分利用琼斯矩阵光学分析棱镜谐振腔的特性,在不同材料棱镜情况下,比较了可变输出耦合率、泡克耳斯盒的消光比以及输出耦合率的调节.得到泡克耳斯盒在四分之一波长电压下能够得到比半波长电压更高的消光比,从而更适合在调Q工作状态下工作.

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For the first time, to the best of our knowledge, a radially polarized laser pulse was produced from a passively Q-switched Nd:YAG ceramic microchip laser with a piece of Cr4+:YAG crystal as the saturable absorber and multilayer concentric subwavelength grating as the polarization-selective output coupler. The averaged laser power reached 450 mW with a slope efficiency of 30.2%. The laser pulse had a maximum peak power of 759 W, a minimum pulse duration of 86 ns, and a 6.7 kHz repetition rate at 3.7 W absorbed pump power. The polarization degree of the radially polarized pulse was measured to be as high as 97.4%. Such a radially polarized laser pulse with a high peak power and a short width is important to numerous applications such as metal cutting. (C) 2008 Optical Society of America

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制备了用于离子交换法制备光波导器件的掺铒碲-钨-钠玻璃基质。应用扎得-奥菲而特(Judd—Ofelt)理论计算了玻璃样品的三个强度参量,由强度参量计算了Er^3+离子的自发跃迁几率、荧光分支比等光谱参量;应用麦克库玻(McCumber)理论,计算了Er^3+离子在1.5μm的受激发射截面,荧光测试发现Er^3+离子的荧光半峰全宽可达65nm。比较了Er^3+离子在不同玻璃基质中的光谱特性。结果表明,Er^3+离子在碲-钨-钠玻璃中具有较高的受激发射截面和较宽的荧光半峰全宽,可以用于宽带光波导器件的制备。

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研究了Cr^3+,Yb^3+,Er^3+共掺磷酸盐铒玻璃转镜调Q激光性质.三种Er2O3掺杂浓度的激光实验结果表明,在Er2O3名义掺杂浓度为0.5wt%时,玻璃的综合激光性质最好,重复频率为0.1Hz时,它的激光阈值功率为14.5mJ,最大输出能量为9.6mJ,斜率效率为0.55%.在同种实验条件下,比较了Cr14和Kigre公司生产的QE-7S激光性质参数,实验表明,前者激光阈值功率稍低,而后者的斜率效率和最大输出功率略高.

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研制了一种用于宽带波导放大器的掺铒碲钨酸盐激光玻璃材料,对玻璃热稳定性、光谱性质进行了表征,并在其上采用离子交换法制作了平面光波导.掺铒碲钨酸盐玻璃的转变温度Tg和析品开始温度Tx分别为377.1和488.5℃;荧光半高宽为52nm;应用McCumber理论,计算得出Er^3+离子4I13/2→^4I15/2跃迁在峰值波长1532nm的受激发射截面为0.91×10^-20cm^2.不同条件下制作了在632.8nm处多模的平面光波导,通过拟合得到Ag^+离子在300℃的有效扩散系数De为2.82×10^-1

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A new Er(3+)/Yb(3+) co-doped phosphate glass has been prepared, which exhibits good chemical durability and spectralproperties. Planar graded index waveguides have been fabricated in the glass by (Ag+)-Na(+) ion exchange in a mixed melt of silver nitrate and potassium nitrate. Ion exchange is carried out by varying the process parameters such as temperature, diffusion time, and molten salt compositions. The diffusion parameters, diffusion coefficients, and activation energy are determined by the guidelines of fabricated waveguides, which are determined by the input prism coupling technique.

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研究了掺铒磷酸盐玻璃波导放大器的特性。利用重叠因子将980nm光抽运的掺铒玻璃波导放大器四能级模型的速率-传输方程进行化简,在考虑上转换效应和放大自发发射的情况下.利用数值模拟的方法,得到了掺铒玻璃波导放大器的增益与Er^3+离子浓度、抽运功率、波导长度等参量之间的关系曲线;同时模拟出放大自发发射曲线并与实验测量结果进行比较。结果表明在考虑上转换效应和放大自发发射的情况下,理论结果和实验测量结果是一致的。同时看到,选择合适的铒离子浓度是制作掺铒玻璃波导放大器的关键;并且为了全面发挥掺铒玻璃波导放大器的性能