Research Of Temperature Control System For Nonlinear Crystal

Laser diode-pumped solid-state lasers and its frequency technology in today's laser technology is an important direction of development. The technology has important applications in technology and scientific research, industrial processes, information science, research of national defense and other fields. In laser frequency system, the frequency output efficiency and output stability greatly affected by the external environment, including the crystal temperature change is often a key factor. In the high average power laser frequency system, the frequency crystals absorb some of laser energy, resulting in a crystal of the rapid changes in temperature, and the phase-matching conditions for the damage. This will greatly reduce the frequency conversion efficiency and stability. Therefore, non-linear crystal temperature must be controlled within a certain range. Phase change materials used in the field of heat exchangers in the transformation process in the temperature remain the same or very small changes in the scope. This method can be used as a new frequency crystal temperature control methods.This paper on the nonlinear crystal temperature control was simulated and experimental study, which reads as follows:(1) The paper introduced LD-pumped all-solid-state lasers research and nonlinear crystal temperature control of the research status.(2) The paper described the theory of laser frequency conversion, the second harmonic analysis of the mechanism, phase matching principle and the phase-matching method and the common frequency crystal.(3) The paper described the transformation of energy storage, analysis of the heat transfer process, given mathematical model, introduced some phase change materials and their thermal properties.(4) Three models are designed and simulated by making use of the finite element analysis software, AYSYS 9.0. The three conditions are discussed: the outside world under constant water temperature, water temperature fluctuations in external circumstances Crystal and KTP laser heat internal circumstances change over time.(5) A temperature control system is designed under the existing conditions in Chapter 5. And the system is demonstrated through the experiment. The experiments show that the system can be basically maintained KTP crystal temperature constant if the temperature in the transformation of the phase change materials is controlled.