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一、引宫近年来国内高校普物实验的改进倾向于采用计算机代替手工调节和测量,但实验的物理内容仍局限于三十年代的范围.在经济条件许可下将新的技术和精密仪器引入普物实验教学有助于增长学生的见识;但实验教学更重要的目的在于启发学生运用自己的物理思想,以力所能及的方法去认识和研究新问题.50年代以后,高分子聚合物在日常生活、工业技术和尖端科学中得到越来越广泛的重要应用,但普物实验迄今未能增加这方面的内容,这是教学中的缺陷.聚合物由粘流态冷却经高弹态到达室温附近的类玻璃态,成为通常所称的塑料.其间经历的结构转变… 相似文献
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Ultra-Stable Rubidium-Stabilized External-Cavity Diode Laser Based on the Modulation Transfer Spectroscopy Technique
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We construct an ultra-stable external-cavity diode laser via modulation transfer spectroscopy referencing on a hyperfine component of the ST Rb D2 lines at 780 nm. The Doppler-free dispersion-like modulation transfer signal is obtained with high signal-to-noise-ratio. The instability of the laser frequency is measured by beating with an optical frequency comb which is phase-locked to an ultra-stable oven controlled crystal oscillator. The Allan deviation is 3.9 × 10-13 at I s averaging time and 9.8 ×10-14 at 90s averaging time. 相似文献
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