摘要
为提高 1060 nm 锥形激光器的输出性能,对 1060 nm 锥形激光器的脊形波导区和锥形增益
区长度进行了优化。当保持总腔长 3 mm 不变时,设置脊形波导区长度为 500,750,1000
μm。在输出功率为 2 W 时,对三种情况所需的输入电流、功率-电流曲线斜率效率、电光转
换效率、输出光谱及远场特性进行了对比。研究结果表明,当脊形波导区长度为 750 μm,锥
形增益区长度为 2250 μm 时,1060 nm 锥形激光器的输出性能最优。当输出功率为 2 W 时,
所需输入电流为 3.95 A,斜率效率为 0.61 W/A,转换效率为 33.9%,光谱宽度(半峰全宽)为
0.3 nm,远场近似高斯分布且 95%能量处的水平发散角约为 14°。
Abstract
The lengths of the ridge waveguide (RW) region and the tapered gain region of a 1060
nm tapered laser are optimized for better output performance of such lasers. When the
total length of the cavity is kept at 3 mm, the length of the ridge RW region is set to 500,
750, and 1000 μm. When the output power is 2 W, the required input currents, slope
efficiencies of power-current curves, electro-optical conversion efficiencies, output
spectra, and far-field characteristics of the three lasers are compared. The results show
that the output performance of the 1060 nm tapered laser is best when the length of the
RW region is 750 μm and that of the tapered gain region is 2250 μm. Under an output
power of 2 W, the required input current is 3.95 A, the slope efficiency is 0.61 W/A, and
the conversion efficiency is 33.9%,the width (full wave at half maximum) of the spectrum
is 0.3 nm, the far field is approximately Gaussian distribution, and the horizontal
divergence angle is about 14° at energy of 95%.
1 引言
高功率、高光束质量的半导体激光器在激光通信、工业生产等领域中具有重要的应用
[1-8]
。
与可见光相比,1060 nm 波段激光可以更好地穿透霾、雾和雨,可显示舰船上的字母,也可消
除某些类型的伪装。此外,1060 nm 波段激光对人眼、热像仪和夜视镜都不可见,可以较好
地保持隐蔽,故其在通信及工业领域中得到了广泛的应用
[9]
,如将其应用于红外探测仪中。随
着各应用领域对 1060 nm 波段半导体激光器输出功率和光束质量的需求的提高,研究人员
提出了锥形半导体激光器的设计思路。
相较传统宽条形高功率半导体激光器,锥形激光器在保证高功率输出的情况下,能获得高光
束质量输出
[10-15]
。锥形激光器一般由脊形波导构成的单模区和锥形增益放大区组成,脊形波
导结构起模式过滤作用,锥形增益区起功率放大作用。精确设计和优化锥形半导体激光器的
结构可以实现较低的阈值电流、较高的输出功率和较高的光束质量。其中,主要的优化设计