At present, there are no products with single-frequency semiconductor lasers with a linewidth lower than 1kHz. Because single-frequency fiber lasers have a long cavity length, and the key component-fiber gratings are very sensitive to temperature and vibration, which affects wavelength stability and frequency The control of drift is a challenge. It is reported that the CoSF-D series of distributed feedback (DFB) single-frequency fiber green laser pointer of Shanghai HannStar have reasonably designed the package of the active phase-shifted fiber grating in the laser and finely controlled the TEC circuit, so that the wavelength stability is better controlled and the wavelength is stable Sex is around 10pm.
In addition, in order to meet the requirements of active wavelength locking and demanding frequency drift applications, the active phase shift fiber grating of the CoSF-D distributed feedback (DFB) single-frequency fiber laser can be installed in the piezoelectric ceramic transducer (PZT) Above, it is used to adjust the cavity length of the single-frequency fiber laser to achieve wavelength locking or rapid modulation of the single-frequency fiber laser.
The PZT selected by the CoSF-D distributed feedback (DFB) single-frequency fiber laser can achieve a wavelength tuning range close to 20GHz under the condition of 200V voltage driving, and the linear response frequency of fast wavelength modulation can reach 20kHz, which can well meet the requirements of fixed Difference frequency locking, external injection locking and frequency stabilization requirements.
Current status and application prospects of single-frequency laser market. After decades of development, single-frequency fiber laser technology has developed relatively mature and complete. As an important high-precision light source, single-frequency fiber laser has a wide range of applications. Although compared with the high-power fiber lasers in the mainstream material processing market, the single-frequency laser market is smaller, but with its unique performance and wide application in special fields, it will become an important supplement to the laser technology team.
At present, single-frequency lasers are mainly used in distributed optical fiber acoustic wave sensing systems, perimeter security, hydrophones, and coherent lidar systems to achieve high-precision imaging, speed and distance remote sensing detection. In addition, single-frequency laser pointer will also play an important role in fields such as oil and gas exploration systems, pipeline monitoring, gas leak detection, cold atom physics, space laser communications, and microwave photonics.