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Typical applications (choose laser according to application) precise measurement

precise measurement

Narrow linewidth lasers have important applications in the fields of precision ranging and surface detection. The stabilized frequency lasers, dual-frequency lasers and swept frequency lasers launched by PerciLasers can be used in these high-precision optical detection scenarios.

Features：

  • Narrow line width
  • Fiber output/Space output
  • Excellent beam quality
  • Good frequency stability
  • Frequency sweep/stabilization

application：

  • Optical precision measurement
  • Optical coherence ranging
  • Surface detection

Based on the Michelson interferometer⁽¹⁾ or Mach-Zehnder interferometer, a narrow linewidth stabilized laser can be used to measure the displacement at the nanometer level with high precision. The relationship between the interference signal I(ΔL) and the displacement change ΔL is:：

High-precision displacement changes can be measured by measuring interference signals. To achieve high-precision measurements at the nm level, the laser wavelength needs to be very stable. Based on saturated absorption frequency stabilization/modulation transfer frequency stabilization, PerciLasers has launched a frequency-stabilized narrow-linewidth laser that can achieve frequency stability and accuracy of <10⁻¹¹. The laser's non-mode-hopping characteristics are also very suitable for long-term continuous measurements in industrial applications.
 
Based on the single-frequency laser interferometer, by inputting two dual-frequency lasers with a small frequency interval, higher-precision laser interferometry can be further achieved. The relationship between the interference signal and the displacement change⁽²⁾ is：

Dual-frequency interferometer interference signal


PerciLasers has launched a dual-frequency interferometer based on narrow linewidth lasers. Due to the internal all-fiber structure and low-noise circuit design, the dual-frequency laser has a very high signal-to-interference ratio and is insensitive to external environmental interference. In order to ensure the stability of the wavelength, one of the lasers can achieve long-term wavelength stability through saturation absorption/modulation transfer frequency stabilization technology.
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Based on a similar principle, or Fizeau interferometer⁽³⁾, narrow linewidth lasers can also be used for high-precision surface detection of precision optical components. Generally speaking, detection is achieved by moving optical components or scanning laser wavelengths. Scanning laser wavelengths can achieve detection without mechanical movement and achieve higher accuracy and stability, so scanning laser wavelength interferometers have gradually become mainstream. This requires achieving ultra-large-range linear scanning while achieving narrow linewidth laser output. The high-precision swept laser launched by Frequency Laser can achieve continuous linear scanning of 200-300GHz at multiple wavelengths, and there is no mode hopping during the scanning process, providing a high-quality light source for high-precision surface detection.
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[1] https://baike.baidu.com/item/%E6%BF%80%E5%85%89%E5%B9%B2%E6%B6%89%E4%BB%AA/9307358
[2] http://staff.ustc.edu.cn/~renxf/physics/guangkejian/chap3_2.pdf
[3] https://baike.baidu.com/item/%E6%96%90%E7%B4%A2%E5%B9%B2%E6%B6%89%E4%BB%AA/12593070