Precision measurement
Narrow linewidth lasers have important applications in precision ranging, facial detection and other fields. The stabilized frequency lasers, dual-frequency lasers and swept frequency lasers provided by Precilasers can be used in these high-precision optical detection applications.
Based on Michelson interferometer⁽¹⁾or Mach-Zehnder interferometer，The displacement can be measured at the nanometer level with high precision using a narrow linewidth frequency-stabilized laser.Interference signalI(ΔL)and relationship between the displacement change ΔL is:
By locking the frequency of the laser to the absorption spectrum of atoms and molecules, the long-term stable output of the laser frequency can be used for precise interferometric ranging.
High performance frequency stabilized laser
| Real photos | Wavelength | Power | Introduction | Features |
 | 532nm | 10-100mW | Through modulation transfer frequency stabilization technology, the 532nm laser is locked to the absorption spectrum of iodine molecules to achieve long-term wavelength stability. |
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| | 633nm | 10-100mW | Through modulation transfer frequency stabilization technology, the 632.8nm laser is locked to the absorption spectrum of iodine molecules to achieve long-term wavelength stability. |
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| | 780nm | 10-100mW | Through modulation transfer frequency stabilization technology, the 780nm laser is locked to the absorption spectrum of rubidium atoms to achieve long-term wavelength stability. |
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| | 1544nm | 10-100mW | Through Saturated absorption spectroscopy stabilization technology, the 1544nm laser is locked to the absorption spectrum of acetylene molecules to achieve long-term wavelength stability. |
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Dual-frequency interferometer interference signal
Precilasers 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.
Based on narrow linewidth laser and dual-channel acousto-optic frequency shifter, frequency accuracy can achieve narrow linewidth dual-frequency laser output. The frequency difference can be adjusted arbitrarily. The laser linewidth is narrow and never mode hopping, so it can be used for optical precision measurement.
High signal-to-noise & contrast ratio dual-frequency laser
| Real photos | Wavelength | Power | Introduction | Features |
 | 633nm | 10-100mW | The 633nm laser generated by sum frequency can output two lasers with a frequency difference of 2-30MHz, which can be adjusted arbitrarily, after passing through a dual-channel acousto-optic frequency shifter. One of the channels can be stabilized by iodine molecules to achieve a stable dual-wavelength fixed frequency difference output. |
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| | 780nm | 10-100mW | The narrow linewidth 780nm laser outputs two lasers with a frequency difference of 2-30MHz that can be adjusted arbitrarily after passing through a dual-channel acousto-optic frequency shifter. One of the channels can be stabilized by rubidium atoms to achieve a stable dual-wavelength fixed frequency difference output. |
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Based on a similar principle, or Fizeau interferometer⁽³⁾，Narrow linewidth lasers can also be used for high-precision Surface Topography Measurement of precision optical components.Usually, detection is achieved by moving optical elements or scanning the laser wavelength.The scanning laser wavelength method can realize detection without mechanical movement and achieve higher accuracy and stability. Therefore, the scanning laser wavelength interferometer has gradually become the mainstream.This requires achieving narrow linewidth laser output while realizing ultra-large range linear scanning.The high-precision swept-frequency laser launched by Precilasers can achieve continuous linear scanning of 200-300GHz at multiple wavelengths without mode hopping during the scanning process, providing a high-quality light source for high-precision surface detection.
Precilasers' swept laser can achieve continuous mode-hop-free scanning of multiple wavelengths, with a large scanning range, high accuracy and high linearity, and can be applied to optical precision measurement, surface measurement and other fields.
Wide range swept laser
| Real photos | Wavelength | Power | Introduction | Features |
 | 633nm⁽¹⁾ | 10mW | By scanning the seed laser and actively compensating, frequency linear scanning up to 80GHz/120GHz/200GHz is achieved |
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| 775nm | 10mW | By scanning the seed laser and actively compensating, a linear frequency scan up to 350 GHz is achieved. |
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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
- Narrow line width
- Fiber output/Space output
- Excellent beam quality
- Good frequency stability
- Frequency sweep/stabilization
Applications:
- Optical Precision Measurement
- Optical coherence ranging
- Surface Topography Measurement