Changchun New Industries Optoelectronics Technology Co., Ltd.
   
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Tel: +86-431-85603799 / 89216078
Fax:    +86-431-87020258
E-mail:  sales@cnilaser.com

国内: 0431-87020257 / 89216068

 

Longitudinal Mode Measurement——Scanning F-P Interferometer

 
     Laser longitudinal mode refers to the axial distribution of the light field along to its direction of propagation. An ordinary laser usually has a few or dozens of longitudinal modes. Using high resolution spectrometer to test the laser spectrum, there will be multiple laser frequencies (or wavelengths). If restraining most of the longitudinal modes through selecting frequencies and just retaining one of them, then we could get single longitudinal mode (single frequency) laser.Single longitudinal laser compares with ordinary laser, has narrower line width and coherence length. It is widely used in spectrum analysis, holographic imaging, interferometry and other fields.
     Scanning Fabry-Perot interferometer is a kind of spectrum analyzer, which is suitable for detecting the subtle spectral characteristics of continuous lasers. It mainly includes sawtooth signal generator, Fabry-Perot interference cavity, and high-speed photodetector.
 

Testing Instrument: Scanning F-P Interferometer

 
  • Confocal Fabry-Perot Design

  • The reflectance of the lens remains above 99% in the range of 532-633 nm

  • Photodiode Detector Included

  • Free Spectral Range: 2.5 GHz

  • Minimum Finesse: 200

 

Model Wavelength Range Free Spectral Range Total Finesse Resolution Cavity Length Mirror Substrate
FPSI 200-532 532-633 nm

(Other wavelengths can be customized)
2.5GHz ≥200 <12.5 MHz 30 mm UV Fused Silica
 

Scanning F-P Controller Box

 


  • Sawtooth Scan Voltage

  • For Piezoelectric Transducer

  • Scan the Separation between the Two Cavity Mirrors

  • High voltage signal duty cycle and amplitude adjustment range are adjustable.

Oscillogram Output Voltage Range Frequency Conversion
Sawtooth 0-10V 0.05/ 0.1/ 0.5/ 1/5 s
 

Examples of Testing Results

 
Single longitudinal mode testing Multiple longitudinal modes testing

Single longitudinal mode testing

Multiple longitudinal modes testing

 

 

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

International Tel: +86-431-85603799  Domestic Tel:  0431-87020257  Fax:+86-431-87020258 

 

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