Optical feedback cavity enhanced absorption spectroscopy with diode lasers
Optical feedback cavity enhanced absorption spectroscopy with diode lasers
复制标题
DOI：
10.1039/b811793d
复制
发表时间：
2009-01-01
期刊：
影响因子：
4.2
通讯作者：
van Leeuwen, Nicola J.
中科院分区：
文献类型：
--
作者：
Baran, Stuart G.;Hancock, Gus;van Leeuwen, Nicola J.
研制了一种光反馈腔增强吸收光谱（OF-CEAS）装置，采用中心波长接近1596 nm的分布反馈二极管激光器。来自V形光学腔的光被允许反馈到激光二极管，在腔模式频率处注入种子激光器，并且对腔谐振产生线宽变窄和频率锁定。OF-CEAS技术的便利性和灵敏度已经得到证明，首先是对接近6260.8 cm（-1）的空气水吸收的测量，然后是对接近6261.7 cm（-1）的两个二氧化碳吸收的测量，可以用来测量CO2样品中13 CO2和12 CO2同位素的浓度。采用中等精细度的腔（F类似于3500），已确定减少采集时间的最小可探测吸收系数为5.8 × 10（-9）cm（-1）s（1/2）。
An optical feedback cavity enhanced absorption spectroscopy (OF-CEAS) apparatus has been developed, using a distributed feedback diode laser centred close to a wavelength of 1596 nm. Light from a V-shaped optical cavity is allowed to feed back to the laser diode, injection seeding the laser at the cavity mode frequencies, and bringing about linewidth narrowing and frequency locking to the cavity resonance. The OF-CEAS technique's expediency and sensitivity have been demonstrated, first on measurements of aerial water absorptions close to 6260.8 cm(-1), and then on two carbon dioxide absorptions close to 6261.7 cm(-1) which may be used to measure the concentrations of 13 CO2 and 12 CO2 isotopologues in a CO2 sample. Employing a cavity of moderate finesse (F similar to 3500), an acquisition time-reduced minimum detectable absorption coefficient of 5.8 x 10(-9) cm(-1) s(1/2) has been determined.