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And the need for cooling by liquid nitrogen, its superiority has not been reflected, so the LD as a solid-state laser pump source is very immature, not people pay attention to the nearly two decades, the 1980s With the advent of quantum wells and strained quantum well material using molecular beam epitaxy (MBE) and metal organic chemical vapor deposition (MOCVD) technology of LD threshold current is greatly reduced, continuous or quasi-continuous LD output power and conversion efficiency has been greatly improved, while life continues to increase, production costs and sales prices have been declining to .90, with high efficiency, high stability, high power laser diode array. The website ofgreen laser pointerneeds to be optimized more.
LD cooling technology breakthrough in laser diode pumped solid state laser entered a period of rapid development, a variety of configurations, a variety of work, a variety of laser media DPSSL gradually practical. With the rapid development of the LD the, research DPSSL scaled to a new level, and achieved rapid development and achieve a practical level. foreign Coherent Spectra a physics and SDL were launched various types of continuous and pulse small DPSSL laser. like the U.S. Lawrence Livermore National Laboratory, Massachusetts Institute of Technology, University of Southampton in the UK, Tianjin University, Tsinghua University, Shanghai Optics and Fine Mechanics, Institute of Physics, Shandong University and other units also DPSSL a lot of research. The company has gain more potential customer in the product exhibition ofgreen laser pointer.
In recent years, with high-brightness pump source, a high-gain laser medium, with the boule development of nonlinear constant, there have been more compact, smaller, higher output power, better beam quality, wavelength covering from UV to the infrared various DPSSL laser. 3 the LD side-pumped Nd: YAG laser laser design and analysis 3.1 of LD side-pumped Nd: YAG laser design and analysis of array tube pump source structure analysis 3.1. an array of tubes pumping source structure analysis This project uses the semiconductor array laser tube, each array tube 12 cm bar, the operating frequency of 20 Hz, pulse width 200 s, each emission energy of 240 mJ and cm bar assembly structure of the side view in Figure 3-1. The file management ofgreen laser pointeris good for the document management ofgreen laser pointerworkshop.
Figure 3-1 LD array tube assembly structure diagram in Figure 3-1, the the Block1 semiconductor laser heat sink cooler movie in the Block 2, Block 3 is fixed and a heat sink, processed into heat-piece, the both sides of the mounting holes. so that laser skeleton of the whole structure is compact, good heat dissipation, accurate temperature control. 3.1.2 laser crystal rods select the Nd: YAG laser crystal is one of the most commonly used laser crystals, its parameters are particularly conducive to the laser to produce YAG cubic structure of the narrow fluorescence spectrum can produce a high gain, low threshold laser. so use of Nd: YAG laser crystal laser material (1) Nd: YAG laser crystal concentration to choose the best Nd concentration to a certain extent, improve the performance of Nd: YAG laser. After the acceptance, the summary meeting of green laser pointer will be held.
YAG in the atomic concentration is generally limited to less than 1 percent to 1.5 percent, higher concentrations will reduce the fluorescence lifetime, linewidth broadening caused by strain in the crystal, resulting in the deterioration of optical quality for the Q-switched operation, in order to produce high energy need to increase the doping concentration of Nd, which selected the 1.2% Nd: YAG laser crystal (2) of Nd: YAG laser crystal diameter of φ to determine the laser pump structure, issued by the pump source, the pump radial incident along the laser crystal, and 10 by the side of the laser crystal along the radial spread to the other side, most of the laser crystal absorption, the remaining light after reflection by the condenser, the pump light along the laser crystal the same radial incident, re-absorbed by the laser crystal. The oversea visiting delegation of green laser pointer is on the guest list.