Design For High Duty-Cycle (20%) High Power Laser Diode Array And A Study On Thermal Characteristics Of It

Semiconductor laser have a important role in the development of national economy because of it's small bulk, little weight, high efficiency and long life time. High power laser diode array is mainly used as the pumping energy source for solid state laser. There is the need for high duty-cycle laser diode array to satisfy the demand the DPSSL (diode pumping solid state laser) technology. Now to build the modernization of industry and national defend, DPSSL is developing quickly in whole country. So largely developing high power laser diode array is meaningful for the fast development of economy, the modernization of national defend and the promotion of people's life.At first, we get the source of heat in high power laser diode and diode's characteristics depending on temperature basing on some basic physical concepts and analysis on the mechanism of heat in high power laser diode. Then after analyzing the heat conduction in laser diode array, we simply simulate the transient thermal behavior of high power laser diode array and build a two dimensional static model of temperature distribution of it by FEM (finite element method). At last, through calculation we get the two dimensional temperature distribution of the chip and the submount of a high power laser diode array, which are consistent with the test data. Moreover, we give a further discussion on the numerical value calculation of temperature distribution.The main problem when we design the high duty-cycle high power laser diode array we face is the large amount of heat during its operation. So we change the proportion of someingredients and the concentration of the dopage to gain high quality III-V material. According the temperature distribution of the high power laser diode array, we design a high efficient water cooler to accelerate the conduction of heat with the circular water in the cooler in order to disperse the heat in the active region of a laser, so we can keep a constant operational temperature. By doing those and solving such problems, we can master the technology of gaining the high duty-cycle high power laser diode array, including the material growth, the making of a laser bar. The main parameters of high power laser diode array are met with the pre-demand, including the duty-cycle.