TN247 94063969激光束偏转法检测金属表面层的缺陷=Detectionof defects under surface in metals by OBDmethod[刊,中]/施柏煊,赵杰,龚健(浙江大学光科系)//激光与红外.-1994,24(2).-53-58编程计算了由激光光热效应产生的金属表面的温...TN247 94063969激光束偏转法检测金属表面层的缺陷=Detectionof defects under surface in metals by OBDmethod[刊,中]/施柏煊,赵杰,龚健(浙江大学光科系)//激光与红外.-1994,24(2).-53-58编程计算了由激光光热效应产生的金属表面的温度分布和泵浦光的调制频率、金属层厚度等的关系,预言检测深度缺陷的能力。用激光光束偏转法检测到表面下不同深处的缺陷。展开更多
P225.2 2003020997激光多周期测距方法=Multi-cycle laser range measurement[刊,中]/郝建华(装备指挥技术学院测量控制系.北京(101416)),曾峦//红外与激光工程.—2002,31(2).—109-112介绍了脉冲激光测距的工作原理,分析了脉冲激光测...P225.2 2003020997激光多周期测距方法=Multi-cycle laser range measurement[刊,中]/郝建华(装备指挥技术学院测量控制系.北京(101416)),曾峦//红外与激光工程.—2002,31(2).—109-112介绍了脉冲激光测距的工作原理,分析了脉冲激光测距存在的问题,在此基础上提出了激光多周期测距方法,即用接收到的回波信号驱动发射激光主波脉冲,从而形成振荡,通过测量多个周期内的时间积累后取平均而计算距离的一种方法。阐述该方法的基本工作原理,并就提高测量精度的方法和影响因素进行了分析。给出了实现该方法的系统组成框图。展开更多
High power and high-slope efficiency 650nm band real-refractive-index ridge w aveguide AlGaInP laser diodes with compressive strained MQW active layer are for med by pure Ar ion beam etching process.Symmetric laser me...High power and high-slope efficiency 650nm band real-refractive-index ridge w aveguide AlGaInP laser diodes with compressive strained MQW active layer are for med by pure Ar ion beam etching process.Symmetric laser mesas with high perpendi cularity,which are impossible to obtain by traditional wet etching method due to the use of a 15°-misoriented substrate,are obtained by this dry etching metho d.Laser diodes with 4μm wide,600μm long and 10%/90% coat are fabricated.Th e typical threshold current of these devices is 46mA at room temperature,and a s table fundamental-mode operation over 40mW is obtained.Very high slope efficien cy of 1.4W/A at 10mW and 1.1W/A at 40mW are realized.展开更多
An effective design method of freeform micro lens array is presented for shaping varied laser beams into prescribed rectangular illumination. The variable separation mapping is applied to design concave freeform surfa...An effective design method of freeform micro lens array is presented for shaping varied laser beams into prescribed rectangular illumination. The variable separation mapping is applied to design concave freeform surfaces for constructing a freeform lens array. Several dedicated examples show that the designed freeform optical lens array can achieve a prescribed rectangular illumination pattern, especially without considering the initial states of incident laser beams. Both high collection efficiency and good spatial uniformity can be available simultaneously. Tolerance analysis is also performed to demonstrate that this optical device can well avoid fabricating difficulty in actual applications.展开更多
文摘TN247 94063969激光束偏转法检测金属表面层的缺陷=Detectionof defects under surface in metals by OBDmethod[刊,中]/施柏煊,赵杰,龚健(浙江大学光科系)//激光与红外.-1994,24(2).-53-58编程计算了由激光光热效应产生的金属表面的温度分布和泵浦光的调制频率、金属层厚度等的关系,预言检测深度缺陷的能力。用激光光束偏转法检测到表面下不同深处的缺陷。
文摘P225.2 2003020997激光多周期测距方法=Multi-cycle laser range measurement[刊,中]/郝建华(装备指挥技术学院测量控制系.北京(101416)),曾峦//红外与激光工程.—2002,31(2).—109-112介绍了脉冲激光测距的工作原理,分析了脉冲激光测距存在的问题,在此基础上提出了激光多周期测距方法,即用接收到的回波信号驱动发射激光主波脉冲,从而形成振荡,通过测量多个周期内的时间积累后取平均而计算距离的一种方法。阐述该方法的基本工作原理,并就提高测量精度的方法和影响因素进行了分析。给出了实现该方法的系统组成框图。
文摘High power and high-slope efficiency 650nm band real-refractive-index ridge w aveguide AlGaInP laser diodes with compressive strained MQW active layer are for med by pure Ar ion beam etching process.Symmetric laser mesas with high perpendi cularity,which are impossible to obtain by traditional wet etching method due to the use of a 15°-misoriented substrate,are obtained by this dry etching metho d.Laser diodes with 4μm wide,600μm long and 10%/90% coat are fabricated.Th e typical threshold current of these devices is 46mA at room temperature,and a s table fundamental-mode operation over 40mW is obtained.Very high slope efficien cy of 1.4W/A at 10mW and 1.1W/A at 40mW are realized.
基金supported by the National Natural Science Foundation of China(No.61405037)the Science and Technology Project of Fujian Province(No.2015H4014)
文摘An effective design method of freeform micro lens array is presented for shaping varied laser beams into prescribed rectangular illumination. The variable separation mapping is applied to design concave freeform surfaces for constructing a freeform lens array. Several dedicated examples show that the designed freeform optical lens array can achieve a prescribed rectangular illumination pattern, especially without considering the initial states of incident laser beams. Both high collection efficiency and good spatial uniformity can be available simultaneously. Tolerance analysis is also performed to demonstrate that this optical device can well avoid fabricating difficulty in actual applications.
