The frequency stability of an all-solid-state Nd:YVO4 laser is significantly improved by means of a specially designed Fabry-Perot (F-P) interferometer used for the frequency standard in the frequency-stabilizing syst...The frequency stability of an all-solid-state Nd:YVO4 laser is significantly improved by means of a specially designed Fabry-Perot (F-P) interferometer used for the frequency standard in the frequency-stabilizing system. The ten.peraturo of the F-P cavity is accurately controlled by a set of thermoelectric cooler (TEC) modules attached on th dy of the cavity and the electronic feedback circuit. We find that the long-term unidirectional frequency shift of the output laser, resulting from the slow increase of the cavity length under the effect of the temperature integration on the cavity body, is essentially eliminated. The frequency stability of the output laser with the power of 530 mW is better than ±200 kHz in 1 minute and ±2.3 MHz iu 40 minutes, respectively. The fluctuation of output power is smaller than ±0.5% over one hour.展开更多
针对当前应用技术大学控制类课程实训教学设备短缺现象,设计了基于通用电气公司PAC RX3i控制器和Proficy Process System过程控制软件的恒温控制实训装置。该装置成本低、易制作,已用于高校的实训教学。电气部分采用端口开放形式并设置...针对当前应用技术大学控制类课程实训教学设备短缺现象,设计了基于通用电气公司PAC RX3i控制器和Proficy Process System过程控制软件的恒温控制实训装置。该装置成本低、易制作,已用于高校的实训教学。电气部分采用端口开放形式并设置接线端子,方便学生进行系统联线、测试,有利于学生动手操作能力的培养。整套设计方案不仅适用于高校自动控制课程实训教学,而且对于研发实训教学设备具有借鉴参考意义。展开更多
基金This research was supported by the Major State Basic Research Project of China (No. 2001CB309304) the National Natural Science Foundation of China (No. 60238010, 60178012, and 60378014), and Shanxi Provin- cial Science Foundation (No. 20011030).
文摘The frequency stability of an all-solid-state Nd:YVO4 laser is significantly improved by means of a specially designed Fabry-Perot (F-P) interferometer used for the frequency standard in the frequency-stabilizing system. The ten.peraturo of the F-P cavity is accurately controlled by a set of thermoelectric cooler (TEC) modules attached on th dy of the cavity and the electronic feedback circuit. We find that the long-term unidirectional frequency shift of the output laser, resulting from the slow increase of the cavity length under the effect of the temperature integration on the cavity body, is essentially eliminated. The frequency stability of the output laser with the power of 530 mW is better than ±200 kHz in 1 minute and ±2.3 MHz iu 40 minutes, respectively. The fluctuation of output power is smaller than ±0.5% over one hour.
文摘针对当前应用技术大学控制类课程实训教学设备短缺现象,设计了基于通用电气公司PAC RX3i控制器和Proficy Process System过程控制软件的恒温控制实训装置。该装置成本低、易制作,已用于高校的实训教学。电气部分采用端口开放形式并设置接线端子,方便学生进行系统联线、测试,有利于学生动手操作能力的培养。整套设计方案不仅适用于高校自动控制课程实训教学,而且对于研发实训教学设备具有借鉴参考意义。
