查询词典 difference frequency

As walk-off angle and acceptance angle of beam limit the conversion efficiency and the tunable wavelength range of difference frequency generation, research include effective nonlinear coefficient, walk-off angle and acceptance angle as functions of wavelength, the relationship between conversion efficiency and acceptance angle, and the impact of crystals length on the process of frequency conversion.

由于光束的走离角、允许角限制了转换效率和差频调谐波长范围，研究内容还涉及了有效非线性系数、走离角和允许角与波长的关系，转换效率与允许角的关系，以及晶体长度在频率变换过程中产生的影响。

This beat frequency of light is analogous to two different audio frequencies which combine to produce a third difference frequency.

这个拍频光的是类似于两个不同的音频频率相结合产生的第三差频。

And we also proposed CEP self-stabilization by use of difference frequency generation between mudulational up-conversion amplification and pump pulses.

使用这种极具潜力的新方案，我们在简单的OPA装置上实现了超短激光脉冲CEP的自稳定。

A power ultrasonic supply ,which can realize zero phase difference frequency tracing and fixedness of output power,is presented in this paper.

本文介绍了一种具有无相差频率自动跟踪和输出功率恒定功能的功率超声电源，此电源采用集成锁相环来实现无相差自动频率跟踪，采用 PWM方式控制 BUCK电路的斩波，达到恒功率及功率可调的目的。

A simultaneous dual-wavelength continuous wave, quasi-cw or linearly polarized wave diode-end-pumped Nd:YAG laser operating at 1319nm and 1338nm is demonstrated. To the best of our knowledge, our experimental results achieve the highest level in the domestic domain. The simultaneous dual-wavelength laser provides an experimental basis for generating highly coherent THz wave radiation of 3.23THz by nonlinear optical difference frequency method.2. A diode-end-pumped Nd:YAG crystal, type-I critical phase matching LBO crystal intra-cavity frequency doubled, simultaneous multi-wavelength red laser at 659.5nm, 664nm and 669nm is firstly realized.

本论文主要围绕用于差频产生THz辐射源的多波长激光器及THz光子晶体的带隙特性分析而展开，论文的主要内容包括：一、从LD端面泵浦固体激光器的激光阈值公式出发，理论计算了腔镜对于两个波长的透过率关系，实现了LD端面泵浦Nd：YAG 1319nm/1338nm双波长激光连续、准连续及线偏振稳定输出。

Frequency conversion that one-chip computer control transfer speed systematic design philosophy with transfer to difference frequency control.

单片机控制的电机交流调速系统设计思想是用转差频率进行控制。

An automatic balancing head employing permanent magnetic difference frequency motor is designed in the paper, to realize a non-contact transmission of control signal and driving energy between a control element and the balancing head.

李勇设计了使用永磁差频电动机的自动平衡头，实现了控制单元和平衡头之间控制信号和驱动能量的无接触传递。

An automatic balancing head employing permanent magnetic difference frequency motor is designed in the paper, to realize a non contact transmission of control signal and driving energy between a control element and the balancing head.

设计了使用永磁差频电动机的自动平衡头，实现了控制单元和平衡头之间控制信号和驱动能量的无接触传递。

A structure of automatic balancing head using PMDFM (Permanent Magnet Difference Frequency Motor) and an automatic balancing technique employing non-contact synchronously rotating electromagnetic force are put forward, and both are studied in respects of theoretical analysis, parameter calculation and experiment practice.

本文是在国家教委高校博士学科点基金和黑龙江省自然科学基金的资助下完成的，侧重于研究采用特种电机结构的自动平衡头的新的原理、结构及驱动控制方法。

The magnitude and phase of the composed balancing vector are adjusted by means of controlling difference frequency of current in inner stator windings.

通过控制内定子绕组电流频差信号以实现对平衡矢量幅值与相位的在线调节。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。