论文标题
推动室温的连续波动操作限制基于燃气的频带级联激光器超过6 $μ$ m
Pushing the room temperature continous-wave operation limit of GaSb-based interband cascade lasers beyond 6 $μ$m
论文作者
论文摘要
我们提出基于燃气的级联级联激光器，在20 $^\ circ $ c连续操作中以6.12 $ $ m的中心波长发射，最大工作温度为40 $^\ circe $ c。基于广泛区域设备的脉冲测量通过应用最近发表的方法来调整活性区域中的Gainsb层厚度以减少价值间带的吸收，从而提高了性能。 W-Quantum井设计调整和电子喷油器的优化，以重新平衡活性量子井中的电子和孔浓度，改善了设备性能，在脉冲操作下为宽面积设备的室温电流密度低至0.5 ka/cm $^2 $。作为这种改进的直接结果，可以扩展基于连续波动的燃气ICL的长波长极限。对于Epi侧的向下安装23 $μ$ m宽和2毫米长的设备，具有9个主动阶段和高反射性的后面，阈值功率低于1 W，在连续波模式下，在20 $^\ Circ $ c时，光输出功率超过25 mW。这种低阈值和低功率消耗式级联级联激光器对移动和紧凑的传感系统特别有吸引力。
We present GaSb-based interband cascade lasers emitting at a center wavelength of 6.12 $μ$m at 20$^\circ$C in continuous-wave operation up to a maximum operating temperature of 40$^\circ$C. Pulsed measurements based on broad area devices show improved performance by applying the recently published approach of adjusting the GaInSb layer thickness in the active region to reduce the valence intersubband absorption. The W-quantum well design adjustment and the optimization of the electron injector, to rebalance the electron and hole concentrations in the active quantum wells, improved the device performance, yielding room temperature current densities as low as 0.5 kA/cm$^2$ for broad area devices under pulsed operation. As a direct result of this improvement the long wavelength limit for GaSb-based ICLs in continuous wave operation could be extended. For an epi-side down mounted 23 $μ$m wide and 2 mm long device with 9 active stages and high-reflectivity back facet the threshold power is below 1 W and the optical output power is over 25 mW at 20$^\circ$C in continuous-wave mode. Such low-threshold and low-power consumption interband cascade lasers are especially attractive for mobile and compact sensing systems.
