排序方式: 共有70条查询结果,搜索用时 31 毫秒
1.
We report a high-power thin Nd:YAG slab laser with slab dimension of 1 × 10 ×60 (mm) partially edgepumped by diode laser arrays. Passive Q-switching is achieved with a Cr^4+ :YAG microchip adopted as the saturable absorber mirror. The pulse duration is around 10 ns while the pulse repetition rate is higher than 10 kHz. The average output power of 70 W is obtained with a slope efficiency of 36%. The diffraction limited beam quality in the thickness direction is obtained by controlling the pump beam diameter inside the slab. The laser head is very compact with size of only 60 × 74×150 (mm). 相似文献
2.
Diode-end-pumped continuous-wave(CW) Tm:YAP and Tm:YLF slab lasers are demonstrated. The a-cut Tm:YAP and Tm:YLF slabs with doping concentrations of 4 at.-% and 3.5 at.-%,respectively,are pumped by fast-axis collimated laser diodes at room temperature. The maximum CW output powers of 72 and 50.2 W are obtained from Tm:YAP and Tm:YLF,respectively,while the pump power is 220 W,corresponding to the slope efficiencies of 37.9% and 26.6%,respectively. 相似文献
3.
Demonstrations of cw lasing in Cr^2+:ZnSe poly-crystal are reported. The laser consists of a 1.7-mm-thick Cr^2+ :ZnSe poly-crystal disc pumped by a Tin-silica double-clad fibre laser at 2050nm. Using a concave high- reflection mirror with a radius of curvature of 500mm as the rear mirror, the laser delivers up to 1030mW of radiation around 2.367μm. 相似文献
4.
5.
退火处理对ZnO薄膜发光特性的影响 总被引:4,自引:1,他引:3
用脉冲激光沉积法(PLD)在MgO(100)、α-Al2O3(0001)和MgAl2O4(111)衬底上沉积了ZnO薄膜,测量了它们的发射光谱,观察到430nm的蓝光发射,并研究了退火、衬底和激发波长对ZnO薄膜这一蓝光发射的影响.指出ZnO薄膜中430nm的蓝光发射是由锌填隙原子缺陷能级到价带顶能级间的跃迁以及电子从氧空位浅施主能级到价带顶能级间的跃迁两种机理共同作用的结果.在MgO衬底上沉积的ZnO薄膜在350nm光激发下蓝光发射峰最强. 相似文献
6.
7.
对热交换法生长的蓝宝石晶体的热学性质做了系统的研究.在298 ~1773 K的温度范围内,用热膨胀仪测量晶体的主热膨胀系数分别为α11=5.312×10-6 ~8.379×10-6 K-1,α33=6.008×10-6~9.317×10-6K.,r向热膨胀系数αr=5.402×10-6K-1~8.821×10-6K-1.在298 ~1273 K的温度范围内,测得晶体的比热为0.7798~1.2242 J/(g·K).采用激光脉冲法测量了在298~1273 K温度范围内晶体的热扩散系数,并通过计算得出主热导率分别为k11 =31.429~5.556 W/(m·K)和k33 =33.611 ~7.651 W/(m·K),r向热导率kr=36.521 ~9.153 W/(m· K). 相似文献
8.
Lasers from a Tm:YAG slab is end-pumped by continuous-wave output of the Tm:YAG ceramic ceramic am~e reported for the t~rst time to our best knowledge. The Tm:YAG ceramic a laser diode with central wavelength 792nm. At room temperature, the maximum power is 4.5 W, and the sloping efficiency is obtained to be 20.5%. The laser spectrum is centered at 2015nm. 相似文献
9.
本论文给出了一个计算绝缘晶体的热导率的简单计算公式,该公式的准确性已经在大多数的绝缘晶体材料热导率计算结果上得到证明,该计算公式与Slack和Berman提出的公式在本质上是一样的。然而,在Slack和Berman提出的公式中的一些参数,例如德拜温度等,很难直接得到。本文中我们不仅进一步简化了计算热导率的计算公式,公式中涉及的参数都可以利用一些简单的方法得到,同时又具有很高的准确性。本文的工作进一步证明了Peierls的导热理论。 相似文献
10.