High-brightness main oscillation power amplification picosecond laser system

Abstract

The invention belongs to the technical field of ultrafast laser, and discloses a high-brightness main oscillation power amplification picosecond laser system. Comprising an all-polarization-maintaining optical fiber picosecond seed laser, an optical fiber collimator, a spatial isolator, a 45-degree total reflective mirror, a polarization splitting prism, a first-stage solid traveling wave amplifier, a second-stage solid traveling wave amplifier and a third-stage solid traveling wave amplifier which are sequentially arranged in the laser transmission direction, the secondary solid traveling wave amplifier is positioned on one side of reflected light of the polarization splitting prism; and the optical fiber collimator is connected with the full polarization maintaining optical fiber picosecond seed laser through a tail fiber. The picosecond laser system is simple in structure, stable in performance and easy to maintain, high-brightness 1064 nm laser output can be achieved, green light output exceeding 50 W can be achieved on the basis of hectowatt fundamental frequency light by arranging the frequency doubling module easy to integrate and disassemble, and the wide industrial application market requirement can be met.

Description

technical field [0001] The invention belongs to the field of ultrafast laser technology, in particular to a high-brightness main oscillation power amplification picosecond laser system. Background technique [0002] In recent years, due to the advantages of high spectral purity and high peak power, high-brightness picosecond lasers have been widely used in the fields of micromachining, precision ranging, medicine and spectroscopy, and are also commonly used pumps in nonlinear optical frequency conversion applications. Pu light source. The duration of the interaction between picosecond pulses and matter is short, which can avoid the effects of laser linear absorption, energy transfer and diffusion, so as to realize the "cold processing" of materials. [0003] In order to achieve high-brightness picosecond laser output, fiber laser systems can exhibit very high gain and low threshold. The disadvantage is that high peak power often causes optical damage and produces obvious no...

AI Technical Summary

Problems solved by technology

Generally, solid-state amplifiers include two types, one is a diode-pumped solid gain medium regenerative amplifier, which can provide high gain, but the structure is complex and expensive; the other is a traveling wave amplifier, which uses a multi-pass solid gain medium Directly amplify the low-power laser seed source, with simple structure and easy implementation. This type of laser is divided into end-pump and side-pump according to the pumping method

[0005] The pump power density of the end pump is high, which can achieve good mode matching between the pump light and the oscillating light, and can achieve high gain with a short gain medium length. The representative crystal has Nd:YVO 4 , Nd:GdVO 4 The disadvantage is that the crystal cannot withstand high power and requires a multi-stage amplifier structure, which increases the complexity of the system; the advantage of side pumping is that it will not easily burst when pumping at high power, and the water cooling power of the module can reach several kilowatts Commonly used crystals include Nd:YAG, Yb:YAG, etc., but the main problem faced by this type of method is the thermal spherical aberration effect of the gain, that is, the beam quality is difficult to control, which affects the brightness of the final output laser

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