Borgentun Carl, Frez Clifford, Briggs Ryan M, Fradet Mathieu, Forouhar Siamak
Opt Express. 2015 Feb 9;23(3):2446-50. doi: 10.1364/OE.23.002446.
For high-sensitivity absorption spectroscopy, single-mode light sources capable of emitting high optical output power in the 3 to 5 µm wavelength range are vital. Here, we report on interband cascade lasers that emit 20 mW of optical power in a single spectral mode at room temperature and up to 40 mW at 0 °C using second-order laterally coupled Bragg gratings for distributed feedback. The lasers employ a double-ridge design with a narrow 3-µm-wide top ridge to confine the optical mode and a 9-µm-wide ridge for current confinement. The lasers were developed for an integrated cavity output spectroscopy instrument for stratospheric detection of hydrogen chloride at a wavelength of 3.3746 µm and emit at the target wavelength with more than 34 mW of single-mode power.
对于高灵敏度吸收光谱学而言，能够在3至5微米波长范围内发射高光学输出功率的单模光源至关重要。在此，我们报告了一种带间级联激光器，该激光器在室温下以单光谱模式发射20毫瓦的光功率，在0°C时使用用于分布式反馈的二阶横向耦合布拉格光栅，光功率可达40毫瓦。这些激光器采用双脊设计，顶部有一个狭窄的3微米宽脊来限制光学模式，还有一个9微米宽的脊用于限制电流。这些激光器是为一种集成腔输出光谱仪而开发的，用于平流层中氯化氢的检测，波长为3.3746微米，并且以超过34毫瓦的单模功率在目标波长处发射。
