共查询到20条相似文献,搜索用时 46 毫秒
1.
2.
3.
4.
5.
6.
为研究808nm和879nm两种泵浦光对Nd∶GdVO4晶体激光输出特性的影响,并比较两种不同波长泵浦所得连续输出光的效率高低,分析了Nd∶GdVO4晶体的能级结构和两种泵浦光作用下的激光输出特性,发现在879nm也有较强的吸收峰.用808nm和879nm两种不同波长泵浦Nd∶GdVO4晶体的过程是不同的,808nm泵浦是一种间接方式能量转移的过程,在此过程中有明显的热负载产生.而879nm泵浦是将粒子直接激励到激光辐射上能级,降低无辐射弛豫过程产生的热量.从理论上可知,879nm的泵浦量子效率要高于808nm的泵浦量子效率,对减少晶体的热产生有很强的优势.实验中采用激光二极管端面泵浦Nd∶GdVO4晶体直腔方案,研究了两种不同泵浦光泵浦Nd∶GdVO4晶体以获得1063nm的连续光,得到了两种光抽运时的斜效率,发现在同样实验条件下,879nm泵浦的输出光斜效率在小功率泵浦时略高于808nm;而在大功率泵浦的情况下明显高于808nm,最高达到38%.同时,在808nm抽运时,实验上获得了1341nm波长的激光,为光通讯的应用提供了一种光源. 相似文献
7.
8.
9.
10.
11.
《Radiation measurements》2000,32(2):123-128
MgSO4:Dy, MgSO4:Tm and MgSO4:Dy,Mn thermoluminescence (TL) phosphors have been prepared and their emission spectra were measured using a linear heater and optical multichannel analyzer. Emission bands at about 480, 580 and 660 nm of MgSO4 doped with Dy were observed in three dimension (3D) glow curve. Emission bands about 360, 460, and 660 nm were observed in a 3D glow curve of MgSO4 doped with Tm. The emission spectra of MgSO4:Dy and MgSO4:Tm are attributed to the characteristic emission wavelengths from transitions of Dy3+ and Tm3+ respectively. The results show that the structures of traps in matrix materials determine the activation energy distribution and dopant energy levels of rare earth ions are related with the emission spectrum wavelengths of sulfate phosphors. The intensities of the glow peaks in both bands at about 480 and 580 nm in MgSO4 doped Dy and Mn were dramatically reduced in comparison with that of MgSO4 doped Dy except above 300°C. It means that the trapping structures of MgSO4 :Dy phosphor has greatly been altered by the co-dopant Mn but no change is observed in wavelengths of the emission spectra. 相似文献
13.
14.
19.
20.