The laser module adopts a side-pumped module structure, and the 1064 nm and 1319 nm resonant cavities are separately formed into cavities, which can independently control the pumping power. M1 and M4 form a 1064 nm resonant cavity, M2 and M4 form a 1319 nm resonant cavity, M3 and M4 are the common parts of 1064 nm and 1319 nm resonators, and a laser pointer nonlinear sum frequency crystal is placed. This resonant cavity design is called Compound cavity, as shown in Figure 3.
In order to improve the conversion efficiency of the system and realize the output of pulsed laser, acousto-optic Q-switching technology is used in the two resonant cavities to increase the peak power of the laser, which can realize the yellow light pulsed laser output greater than 30 W. Further inserting the etalon group to narrow the output laser linewidth can achieve a yellow pulse laser with an average power greater than 6 W, a frequency of 5 kHz, a wavelength accurately aligned to 589.159 nm, and a linewidth of 4 pm.
The laser product using this cavity design has the characteristics of compact structure and high conversion efficiency. It can realize high power and narrow linewidth laser output of the pulse system. The maximum power of 589 nm can be greater than 30 W, and the beam quality M2 is better than 3. It is suitable for dynamic nuclear polarization, urban landscape, scientific basic research and other fields. High-power composite cavity 589 nm laser.
High-power pulsed mode-locked external-sum frequency 589 nm yellow laser
Pulse mode-locking system refers to the combination of high-power LD bar pulse pumping and mode-locking technology in the laser to realize a mode-locked pulse system composed of a series of mode-locked pulse sequences within a certain width of the macro envelope. The 1064 nm and 1319 nm lasers in the laser system are independently designed, using a cavity structure that combines the green laser pointer seed source and the amplification system, and the power of each part can be individually controlled and adjusted.
After further combining the two high-power beams, the output of the 589 nm yellow laser with high conversion efficiency is realized through a multi-pass nonlinear sum frequency system. Using this cavity design, the average power of the yellow light output is greater than 25 W, the laser center wavelength is aligned to 589.159 nm, and the laser line width: 0.3 GHz. Under the mode-locked pulse system, the main pulse width: 160 μs, micro pulse Longitudinal mode interval: ~10 ns, repetition frequency: 500 Hz, beam quality: M2<1.4, pulse width: 900 ps.
Laser products using this cavity design have the characteristics of high power, narrow linewidth, wavelength alignment, good beam quality, and high conversion efficiency, which meet high-end requirements for wavelength, linewidth, beam quality, high power, and high stability. The development of equipment is suitable for sodium laser beacon, temperature measurement and wind measurement lidar, national defense and military and other fields. High-power pulsed external mode-locked cavity and frequency 589nm laser.