We demonstrate tunable diode laser absorption spectroscopy of CO2 and NH3 near 1.5 mum using a distributed feedback diode laser in conjunction with hollow optical waveguides as long-path sample cells. The waveguides are coiled to reduce the physical extent of the system. The small volume of the waveguide provides rapid instrument response to changes in gas concentration, To reduce the pressure drop associated with long lengths and high flow rates, we perforate the waveguides in a novel geometry providing parallel pneumatic paths while maintaining optical path length. A minimum detectable absorbance of 3.5 x 10(-5) in a 3-m section of waveguide is demonstrated. (C) 2002 Optical Society of America. [References: 22]
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机译：我们展示了使用分布式反馈二极管激光器和中空光波导作为长距离样本池，可在1.5微米附近对CO2和NH3进行可调二极管激光器吸收光谱。波导被盘绕以减小系统的物理范围。波导的小体积提供了对气体浓度变化的快速仪器响应。为减少与长距离和高流速相关的压降，我们以新颖的几何形状对波导进行了穿孔，提供了平行的气动路径，同时保持了光路长度。证明了在波导的3 m区域中最小可检测的吸光度为3.5 x 10（-5）。 （C）2002年美国眼镜学会。 [参考：22]
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