Changchun New Industries Optoelectronics Technology Co., Ltd.
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Contact CNI
Tel: +86-431-85603799 / 89216078
国内: 0431-87020257 / 89216068
Fax:    +86-431-89216068
E-mail:  sales@cnilaser.com
 

Optical Cavity Ring-down Spectroscopy Experiment

 
  Knowledge Introduction
 

    Cavity ring-down spectroscopy technology is a emerging method of spectrum detection. The technology is especially suitable for trace absorption of substance with its characteristics of long absorption optical path and unaffected by the change of light intensity. It is applied to the accurate measurement of high reflectivity of lens (accuracy up to 10-4 ~10-6) and trace gas detection because of simple device and easy quantitative measurement.

    As shown in the fig 1, optical resonant cavity composed of high reflectivity lens M1 and M2, when the 532nm pulsed laser along the optical axis is injected into the cavity, the laser pulse is reflected back and fourth between the two mirrors and from oscillation. Ring-down process of laser pulse in the cavity is detected by the photodetector behind M2 and ring-down time is recorded. Then the reflectivity of lens can be calculated out according to the ring-down time. The students can learn the method to measure the reflectivity of lens accurately by the experiment.

 

        Main points:
       
The principle of cavity ring down spectroscopy technology

        The characteristics and application of cavity ring down spectroscopy technology

        Lens reflectivity of straight cavity measurement with cavity ring down spectroscopy technology

        The choice of core components of cavity ring down spectroscopy technology

 
 
Cavity ring down spectra experiment device CRDS experiment result
Experimental device Experiment result
 
  Related Courses
     Principles of Laser Technology and Application, Optical Measurement Technology and Application, Modern Laser Engineering Application Technology, Application Optics, Spectroscopy
 
  Basic Configurations
 

Name

Specifications

Laser

Q-switched laser, Wavelength:532nm(Include current source)

Plane-concave lens

R=600mm, concavity: high-reflectivity film of 1064nm (different radius of curvature, different transmittance, selectable)

Photodetector

Detection wavelength coverage: 200-1100nm, Rise time:1ns

Oscilloscope Bandwidth: 350MHz, Sampling frequency: 5GSa/s

Others

Slideway, adjusting bracket, Iaser goggle, baffle, etc.

 
 Expanding Experiments    Applications of Instrument
     

  Lens reflectivity of folded cavity measurement

  The content of the gas detection

  Observation and analysis of laser modes based on plane
    scanning interferometer

 

  Teaching experiment and research applications

  Lens with high reflectivity measurement

  The concentration of trace gases detection

 
 

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

Tel:+86-431-85603799     Fax:+86-431-89216068     E-mail: sales@cnilaser.com

 
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