Abstract

A compact Raman system constructed by a parabolic sample cell and an imaging spectrograph, which has good capability for enhancing a Raman signal and compressing a continuous background, has been put forward. In the Raman spectra of ambient air acquired by this system, the signal level of ${\mathrm{N}}_2$ was enhanced up to 14 times compared with free space, and the related signal to background ratio was increased nearly to 96. With an integration time of 10 s, the rotational fine structure of ${\mathrm{O}}_2$ and ${\mathrm{N}}_2$ were clearly recognized. Besides, a standard analytic gas mixture consisting of ${\mathrm{H}}_2$, ${\mathrm{CO}}_2$, and CO was also tested, and the $3\sigma$ LODs of 68 ppm for ${\mathrm{H}}_2$, 54 ppm for ${\mathrm{CO}}_2$ and 116 ppm for CO were obtained.

© 2016 Optical Society of America

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