分析了熔体提拉法生长Ho∶Tm∶YLF晶体过程中熔体表面漂浮物的产生原因，以及晶体中散射颗粒、孪晶和开裂的成因。通过精心设计对称性温场，并调整温场、优化生长工艺参数，有效消除了晶体中的散射颗粒，克服了晶体开裂。采取在生长气氛中加入一定量CF4等工艺措施有效减少了熔体表面上的氟氧化物漂浮物，克服了漂浮物对生长晶体的影响，生长出了尺寸为(25~30)mm×(100~120)mm的高品质HoTmYLF晶体。HoTmYLF晶体激光性能测试表明，在LD双端抽运条件下获得了超过10 W的2.05 μm激光输出，激光斜率效率达到41.2%，光光转换效率达到36.4%。

We report a monolithic Tm:YLF micro laser in this Letter. In order to improve the relaxation oscillation of the laser, both ends of the crystal are coated, making the Tm:YLF crystal itself a resonant cavity. The micro laser is pumped by a 792 nm laser diode operated in the continuous wave (CW) mode.

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The advent of multicore processors has renewed interest in the idea of incorporating transactions into the programming model used to write parallel programs.This approach, known as transactional memory, offers an alternative, and hopefully better, way to coordinate concurrent threads. The ACI (atomicity, consistency, isolation) properties of transactions provide a foundation to ensure that con- current reads and writes of shared data do not produce inconsistent or incorrect results. At a higher level, a computation wrapped in a transaction executes atomically - either it completes successfully and commits its result in its entirety or it aborts. In addition, isolation ensures the transaction pro- duces the same result as if no other transactions were executing concurrently. Although transactions are not a parallel programming panacea, they shift much of the burden of synchronizing and co- ordinating parallel computations from a programmer to a compiler, to a language runtime system, or to hardware. The challenge for the system implementers is to build an efficient transactional memory infrastructure. This book presents an overview of the state of the art in the design and implementation of transactional memory systems, as of early spring 2010.

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