Changchun New Industries Optoelectronics Technology Co., Ltd.
Lasers, Optics & Photonics

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Contact CNI
Tel: +86-431-85603799 / 89216078
Fax:    +86-431-87020258
国内: 0431-87020257 / 89216068
Optical Cavity Ring-down Spectroscopy Detection System
Optical cavity ring-down spectroscopy technology is an emerging method of spectrum detection. This technology is especially suitable for substance weak absorption with its characteristics of long absorption optical path and unaffected by the light intensity fluctuation. It is applied to the accurate measurement of high reflectivity of lens (accuracy up to 10-4 ~10-6) and trace gas detection with features of simple device and easy quantitative measurement.

In CNI Optical Cavity Ring-down Spectroscopy Detection System, as follow figure shows, pulsed laser as a laser source, optical resonant cavity composed of high reflectivity lens M1 and M2, the laser pulse is reflected back and forth between the two mirrors to from oscillation when pulsed laser along with the optical axis injected into the cavity. Laser pulse ring-down process and time is detected and recorded by the photodetector behind M2. Then the cavity gas concentration can be calculated In the condition of known cavity mirror reflectivity.

cavity ring-down spectroscopy

Short pulse laser Pulse duration: 5-20ns, repetition rate:<10KHz, output power: 0-100mW.
High speed photodetector Si substrate photodetector, rise time: 1ns, spectral response range: 400-1100nm
Ring-down cavity Cavity length: 600mm (customized), cavity mirror reflectivity>99.92%@ center wavelength
Others Oscilloscope, air chamber
Detection Signal

600mm straight ring-down spectroscopy

600mm straight ring-down spectroscopy

Application case
   Beijing Jiaotong University School of Science uses CNI optical ring-down spectrum detection system for visibility detection experiments.

Addr: No.888 Jinhu Road High-tech Zone,Changchun 130103, P.R.China

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