Study Of Side Pumped Nd:YAG High Gain Electric Optical Q Switched Laser

The LD side-pumped Nd:YAG electric-optical Q-switched lasers have great application space in laser ranging,laser radar and other fields.The LD pump high efficiency output technology and methods are developed to enable it to have small-energy and high-efficiency laser output characteristics,which is beneficial to reduce system power consumption and cost,and has an important role in promoting further application.From the point of view of the number of times the laser beam passes through the laser gain medium in the round-trip period of the resonator,a high-gain laser rate equation is established,and the effects of different times on the laser output energy,pulse width and other laser output characteristics are compared and analyzed.Secondly,the equivalent resonant cavity of the straight cavity laser and the folded cavity laser is established,and the ABCD matrix is obtained to analyze the characteristics of the cavity.The experimental platform of LD side pumped Nd:YAG crystal V folded cavity is built to realize four over laser gain medium in the round trip cycle.And compared with the common cavity of LD side pumped Nd:YAG crystal.The experimental results show that the threshold of V folded cavity structure is reduced by 66% and the energy is increased by 13.9%.On this basis,an experimental study of a compact triangular prism folded cavity laser is carried out.Based on the principle of the total reflection of the triangular prism,the length of the cavity cavity is greatly reduced and the compact structure of the resonator is realized.Comparing to the straight-cavity Q-switched state with an output pulse width of 18 ns,the folded-cavity laser obtained a 1064 nm laser with an output energy of 18.42 mJ,and a pulse width of 14 ns.The threshold is reduced by 20% and the Q-switching efficiency is increased by 17%.