期刊
APPLIED PHYSICS B-LASERS AND OPTICS
卷 100, 期 2, 页码 291-302出版社
SPRINGER
DOI: 10.1007/s00340-010-4020-z
关键词
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资金
- EPSRC [EP/H02252X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [GR/T04595/01, GR/T04601/01] Funding Source: researchfish
New designs for gas cells are presented that incorporate transmissive or reflective optical diffusers. These components offer simple alignment and can disrupt the formation of optical etalons. We analyse the performance-limiting effects in these cells of random laser speckle (both objective and subjective speckle), interferometric speckle and self-mixing interference, and show how designs can be optimised. A simple, single pass transmissive gas cell has been studied using wavelength modulation spectroscopy to measure methane at 1651 nm. We have demonstrated a short-term noise equivalent absorbance (NEA, 1 sigma) of 2x10(-5), but longer term drift of up to 3x10(-4) over 22 hours.
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