Views: 0 Author: Site Editor Publish Time: 2023-01-29 Origin: Site
Ultra-short pulse laser has wide application potential in the fields of precision machining, intelligent sensing, medical and aesthetic. It is expected that in the next five years, a domestic market scale of 10 billion will be formed. At present, passive mode-locking technology based on semiconductor optical switch is the most mature scheme of ultra-fast seed light source in industry.
"Figure 9 laser" is a new passive mode-locking technology, which has attracted wide attention due to its low noise characteristics. Figure-9 Laser generally controls the mode locking operation state by adding polarization optical elements. However, the parameter space composed of the rotation angles of the two wave plates contains a huge amount of state data, which brings a great challenge to the selection of the optimal working point. If the working point of the Figure-9 laser is not selected properly, it may bring adverse factors such as slow start, easy to lose lock and easy to enter multi-pulse state. At present, the scheme optimization and manufacturing process of Figure-9 laser are still in the stage of being guided by experience, which makes the potential of " Figure 9" technology in industrial mass production not fully released.
In response to this technical bottleneck, the Norpai laser technology team has proposed and implemented a method of automatic control, automatic collection and automatic judgment of the output state of Figure-9 laser internationally. Thanks to this high-speed and complete characterization technology, the complete scanning of the output state of the parameter space of the Figure-9 laser becomes possible. For example, the system can complete the intelligent identification of mode-locking status of about 1 million working points within 24 hours, making it possible to find the optimal working point physically allowed by the laser. Through Jones matrix calculation, the band region formed by the cavity response curve supporting the mode locking state can be clearly displayed. Significantly, when the structural parameters of the laser are changed, the mode distribution of the mode-locked hot zone also changes regularly. If the symmetry of the resonator is destroyed by changing the length of the fiber ring, the laser can only work in the positive phase shift region. This technical breakthrough can quickly and completely display the evolution rule of Figure-9 output state in the whole parameter space, making the identification of the optimal working point of Figure-9 laser enter a new stage of "image recognition".
