熔盐法生长Nd∶YAG晶体

Growth of Diode pumped Crystals of 4% Nd Doped YAG by the Flux Method

熔盐法生长Ｎｄ∶ＹＡＧ晶体罗楚华古开惠谢秋香罗飞（西南技术物理研究所，成都６１００４１）ＧｒｏｗｔｈｏｆＤｉｏｄｅｐｕｍｐｅｄＣｒｙｓｔａｌｓｏｆ４％ＮｄＤｏｐｅｄＹＡＧｂｙｔｈｅＦｌｕｘＭｅｔｈｏｄＬｕｏＣｈｕｈｕａＧｕＫａｉｈｕｉＸｉＱｉｕｘｉ...

Neodymium doped yttrium aluminum garnet referred to YAG∶Nd is well known to possess superior properties for use solid state lasers materials.Its low themal expansion,high thermal conductivity,high mechanical strength,high melting points have made it arguably the best lasers materials. The efficiency of solid state lasers is only 2%-3%,because pump bandwidth of solid state laser crystals is narrow. An increase in the efficiency of solid state lasers is one of the most pressing task in quantum electronics. In order to maximize pump efficiency and power output,the Nd concentration should be made as high as possible without degrading the gain through concentration quenching.High absorption coeffcients can be achieved either by a drastis increase in the Nd concentration of YAG. (provided the concentration quenching of the emitted luminescence is weak) or by utilizing luminescence sensitization. In this paper,growth of high Nd concentration crystals of 4% Nd doped YAG by the flux method.we have carried out investigations on the growth of YAG∶Nd in molten salt system in which Y 2O 3-Al 2O 3-Nd 2O 3 is solute and PbO-PbF 2-B 2O 3 is solvent.The melt was contained in a covered platinum crucible.After holding the melt at 1300℃ for 24h in an atmosphere,it was cooled to 800℃ at a rate of 0.5℃ per hour.single crystals YAG∶Nd were grown from flux and up to 26×28×25mm in size.We developed a high Nd concentration crystals of YAG,which should be suitable for highly efficient campact low threshold lasers.