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Grounding on the purpose of industrialization of laser, based on the thought of astigmatism compensation and thermal stability of the cavity, we employed high power LD to pump Nd:YVO4 crystal and used the introcavity frequency doubling with type 1 noncritical phase-match LBO crystal, which has high damage threshold. The cavity parameters are optimized by the use of ABCD theory and the resonatorstructure CAD software.

立足于激光器的产品化,基于谐振腔的像散补偿和热稳定性的设计思想,采用大功率LD单端泵浦Nd:YVO_4晶体,具有高光损伤阈值的Ⅰ类非临界相位匹配LBO晶体腔内倍频方案,应用ABCD定律和腔结构模拟软件CDA设计并优化了一组腔参数。

A series of mono-, sesqui-, di- and tri-terpenoids with various structural types, which produced by bio- oxidation, hydrogenation, hydrolyzation, esterification and cyclic cleavage toward-limenone, were analyed by GC-MS.

经GC-MS分析发现该两细菌对-柠檬烯有显著的生物催化转化作用,能对底物进行不同程度的氧化、还原、水解、酯化、开环等反应,并产生丰富的系列结构不同的其它萜类化合物:包括单萜、倍半萜、二萜、以及三萜等。

The Practical and New patent is to strack automatically the movement of the sun by a small sync unit using a mirror paraboloid and focus the sunsine on the surface of vacuum heat absorbing pipe, so as to heat the water in a single vacuum heat absorbing pipe with several times of energy,so that the water temperature rises till boils with heat exchange.

家用同步跟踪太阳能开水器是利用镜面抛物面在小型同步装置作用下自动跟踪太阳运动,以7倍于阳光直射的能量将阳光聚焦到真空吸热管的表面,对单根玻璃真空吸热管中的水进行加热,通过对流热交换,使容器中水温上升直至沸腾的太阳能开水器。

Under this condition, tannase activity reached to 51.2 U/gds after 96 h of cultivation, which was 3.6 times as the conventional sterile fermentation.

在该条件下通过96 h的培养,单宁酶的活力可达51.2 U/gds,是常规灭菌发酵的3.6倍。

His team was asked to design a Mach 2 2.5 aircraft, which was then, and probably still is, a nontrivial task-especially when the objective is to create a "cheap" lightweight aircraft. Consider that the force required to overcome drag quadruples when doubling the speed, and what impact that has on aircraft weight.

要知道当飞行速度由单音速变为双音速时,空气阻力会增加至原来的四倍,考虑到因此所需要的动力,及其对机身重量的影响,满足这样的需求,即使是在今天也绝非易事。

Machines have increased a thousandfold in power, languages have mutated, industry practice has gone through multiple revolutions - and Unix hangs in there, still producing, still paying the bills, and still commanding loyalty from many of the best and brightest software technologists on the planet.

机器的能力增长了上千倍,语言产生了变异,工业实践经历了多次的革命--而Unix仍然高高在上地注视着这一切,仍然在生产,仍然在支付帐单,而且仍然拥有这个星球上最好最聪明的软件专家的忠诚。

The high-efficiency SRS in barium nitrate Ba(NO32 crystal was obtained pumped by a Q-switched Nd:YAG laser (532 nm) operated at 30 Hz.

报道了利用重复频率为30 Hz,波长为532 nm 的Nd∶YAG倍频激光单次通过抽运硝酸钡(Ba(NO3)2)晶体(晶体由水溶液降温法生长,长度为48 mm,横截面为10 mm×10 mm),获得高效率的一阶(563 nm),二阶(599 nm)和三阶(639 nm)斯托克斯光的实验结果。

A harmonic of Nd:YAG laser(532 nm) pumped barium nitrate crystal in external resonator and excited stimulated Raman laser.Experimental setup adopted the Raman shifter consisted of external cavity and two prisms spectrometer.The external cavity was composed of diachronic mirrors with optimal reflectivity for Stokes components.

采用单端泵浦的外置拉曼振荡腔与双棱镜分光装置进行了硝酸钡晶体拉曼激光实验,泵浦源为倍频Nd: YAG的532 nm激光,硝酸钡晶体通过水溶液降温法生长,尺寸为10 mm×10 mm×48 mm,采用特殊镀膜的腔镜对各阶斯托克斯光进行优化选择。

A harmonic of Nd:YAG laser (532nm) pumped barium nitrate crystal in external resonator and excited stimulated Raman laser. Experimental setup adopted the Raman shifter consisted of external cavity and two prisms spectrometer. The external cavity was composed of diachronic mirrors with optimal reflectivity for Stokes components. Barium nitrate crystal was grown by the aqua-solution cooling method with the size of 48mm×10mm×10mm.

采用单端泵浦的外置拉曼振荡腔与双棱镜分光装置进行了硝酸钡晶体拉曼激光实验,泵浦源为倍频Nd:YAG的532nm激光,硝酸钡晶体通过水溶液降温法生长,尺寸为10mm×10mm×48mm,采用特殊镀膜的腔镜对各阶斯托克斯光进行优化选择。

The principle of phase-matching and the technology of single-axis and double axises phase-matching as well as the phase matching width is introduced;The main features and optical properties of Nd:YVO_4 and KTP are given.

介绍了相位匹配原理,分别对单轴和双轴晶体的相位匹配、相位匹配宽度做了详细分析;介绍了实验所用的激光晶体板条状Nd:YVO_4的基本特性和光学特性及倍频晶体KTP的光学特性。

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