Innoslab Laser Amplifier Design

Innoslab laser oscillator is a laser diode partially end-pumped slab laser oscillator with hybrid resonator, which is proposed by Dr. Keming Du at the Fraunhofer Institute for Laser Technology at the end of twentieth century. Innoslab laser amplifier, which is developed on the basis of Innoslab laser oscillator, has been widely used in the domestic and abroad due to the advantages of compact structure, high beam quality, high output power and high efficiency. At present, the domestic research of Innoslab laser amplifier is still in its initial stage, and the same kind of product is still blank. Therefore, this paper studies for the Innoslab laser amplifier’s productivization. Through to streamline design of seed laser, the nanosecond pulse and near diffraction limited laser output is obtained by using a semiconductor laser pumped passively Q-switch bonded crystal. Build the Innoslab laser amplification experiment system of double ends pumped Nd:YVO4 crystal, on the basis of the traditional Innoslab laser amplifier cavity insert two pieces of 45° mirror folded cavity, so as to make the pump can be more uniform by pumping laser crystal without adding the waveguide case. The gain is 31 times in the case of 24 mJ pump energy. The width and energy were 1.45 ns and 728μJ respectively when the repetition is 500 Hz. The beam quality factor in both horizontal and vertical direction was under 1.4, and the amplification efficiency of the whole system was about 3%. In addition, the stability of the output power of the laser products in the engineering application is studied. The deformation of three mounting plates of different structures are simulated by finite element analysis. After the analysis of the data processing, the conclusion of minimum internal deformation of the side slotted mounting plate is obtained. At the same time, the experiment is done to verify the same conclusion. That is, the structure of the side slotted mounting plate can make the laser output power more stable, and it can provide a better structure choice for the future productivization of the Innoslab laser amplifier.