The Research On The Wavefront Of Diode-pumped Solid-state Heat-capacity Laser

Solid-state heat-capacity laser(SSHCL) uses a particular operation mode therefore the bottleneck of thermal effect in solid state laser is broken through.It is going to be one of the best candidates of the high power solid state laser on the next generation.The lasing and the cooling step are separated in heat capacity operation.So SSHCL can put out high-average power laser beam with high beam quality.In this thesis,the major work can be summarized as follows:(1) The key technology and main design principle of SSHCL which help to achieve higher average power and frequency were introduced.(2) The main factors which affect the wavefront of SSCHL were analyzed.The measurements of static and dynamic optical aberrations were given.The pump light,temperature and stress distributions in the gain medium slab which accord with the fact were simulated,and the dynamic optical aberration was figured out.(3) According to the design,a two-sided LD end pumped SSCHL was built.An average power of 1.49 kW was achieved by using one Nd:GGG gain media slab,5.27 kW by using three, and 8.77 kW by using five.The respective optical-optical efficiency is 24.1%,23.3%and 20.2%. It proves that the SSHCL is scalable to a high average power.The static and dynamic aberrations of the gain medium were measured by Interference-method.The result shows that the dynamic optical aberration of the gain medium is the main factor that affects the wavefront,and its shape relies on the shape of the pump.The measured effective focal length of the thermal lens is 25 28m.