How to improve the peak power of pulsed fiber laser
Release time：2022.01.27
Views：2494Higher power, shorter pulse and stronger brightness are the constant pursuit of the development of laser technology. In the industrial application of pulsed laser, short pulse and high peak value have an important influence on the material processing result. Compared with solid-state lasers, fiber lasers have more advantages in average power and are obviously limited in peak power. For a long time, the pulse width of fiber pulse laser is limited to more than ns and the peak value is less than 15kw, with 100ns 1MJ as the standard.
Method for increasing pulse peak power
In the laser pulse sequence in Figure 1, the peak power is equal to the pulse energy divided by the pulse width. Therefore, under the condition of the same energy, shortening the pulse width can greatly increase the peak power, and under the condition of the same pulse width, increasing the peak can increase the pulse energy.
At present, among the solid-state pulse lasers in the mainstream industrial market, the laser energy with nanosecond pulse width can reach MJ level. Calculated with 1MJ energy and 10ns pulse width, the peak power can reach 100kW. The energy of picosecond pulse laser is 300 μ J, the peak power can reach 30MW at 10ps. Femtosecond pulse laser with energy of 100 μ J. If the pulse width is 500fs, the peak power will reach 200MW. As a comparison, the peak power of normal MOPA nanosecond pulse laser is about 10kW, which is far lower than that of solid-state laser.
Method for increasing pulse peak power
In the laser pulse sequence in Figure 1, the peak power is equal to the pulse energy divided by the pulse width. Therefore, under the condition of the same energy, shortening the pulse width can greatly increase the peak power, and under the condition of the same pulse width, increasing the peak can increase the pulse energy.
At present, among the solid-state pulse lasers in the mainstream industrial market, the laser energy with nanosecond pulse width can reach MJ level. Calculated with 1MJ energy and 10ns pulse width, the peak power can reach 100kW. The energy of picosecond pulse laser is 300 μ J, the peak power can reach 30MW at 10ps. Femtosecond pulse laser with energy of 100 μ J. If the pulse width is 500fs, the peak power will reach 200MW. As a comparison, the peak power of normal MOPA nanosecond pulse laser is about 10kW, which is far lower than that of solid-state laser.
