Chi Mingjun, Müller André, Hansen Anders K, Jensen Ole B, Petersen Paul M, Sumpf Bernd
Appl Opt. 2020 Jan 10;59(2):295-299. doi: 10.1364/AO.381439.
A novel compact micro-integrated high-power narrow-linewidth external-cavity diode laser around 808 nm is demonstrated. The laser system contains a tapered amplifier consisting of a ridge-waveguide section and a tapered section with separated electrical contacts. Thus, the injection currents to both sections can be controlled independently. An external volume Bragg grating is utilized for spectral narrowing and stabilization. The diode laser system is integrated on a 5×13 aluminum nitride micro-optical bench on a conduction cooled package mount with a footprint of 25×25. The diode laser system is characterized by measuring the output power and spectrum with the injection currents to the ridge-waveguide section () and tapered amplifier section () changed in steps of 25 and 50 mA, respectively. At =200 and =6.0, 3.5 W of output power is obtained with an emission spectral linewidth with an upper bound of 6 pm, and a beam propagation factor in the slow axis, , of 2.6 (1/). The characterization of the temperature stabilization of the laser system shows an increase of the wavelength at a rate of 6.5 pm/K, typical for the applied volume Bragg grating.
展示了一种新型紧凑的微集成高功率窄线宽外腔二极管激光器，波长约为808 nm。该激光系统包含一个锥形放大器，其由一个脊波导段和一个带有分离电接触的锥形段组成。因此，可独立控制这两个段的注入电流。利用一个体布拉格光栅来实现光谱窄化和稳定。该二极管激光系统集成在一个5×13的氮化铝微光学平台上，该平台安装在传导冷却封装上，占地面积为25×25。通过分别以25 mA和50 mA的步长改变注入到脊波导段（）和锥形放大器段（）的电流，对二极管激光系统进行了表征。在=200和=6.0时，获得了3.5 W的输出功率，发射光谱线宽的上限为6 pm，慢轴方向的光束传输因子为2.6（1/）。激光系统温度稳定性的表征显示，波长以6.5 pm/K的速率增加，这对于所应用的体布拉格光栅来说是典型的。
