In this paper, the eigenvalue of the super-high precision stable resonator is used as a reference frequency, and the wide-linewidth semiconductor laser is used as a light source. To keep costs down, this work combines the optical feedback effect with the Pound- Drever- Hall laser frequency stabilization method, abandons the electro-optic modulator used in the traditional technology and adopts the optical path tuning method to carry out the phase modulation of the incident light field. The document derives from the shape of error signal in frequency stabilization technology in the presence of optical feedback effect notionally. As per this error signal, the length of resonator cavity is controlled by feedback controlled via the circuit system, and then successfully stabilizes the resonant frequency of the resonator at the center frequency of the laser output.
Carbon monoxide (CO) is an important object for atmospheric quality and medical diagnosis, and its trace concentration detection technology has been of great attention. For this purpose, various new detection methods have emerged, such as cavity ring down absorption spectroscopy and cavity enhanced absorption spectroscopy. In this paper, the demand for CO ppm-level trace concentration detection is taken as the traction, and an optical feedback cavity enhanced absorption spectroscopy system with an equivalent noise absorption sensitivity of 7.4×10-10cm-1Hz-1/2 is established to carry out the experiment of near-infrared detection of CO gas concentration. Based on the measurement data of the OF-CEAS system, the minimum measurable CO concentration of the system was inferred to be 1.98 ppm. This system can be developed as a portable respiratory gas diagnostic device and an atmospheric trace gas detection device such as NH3 and CO.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.