Edited, memorised or added to reading queue

on 20-Apr-2024 (Sat)

Do you want BuboFlash to help you learning these things? Click here to log in or create user.

Flashcard 7624936787212

Question
在描述LED生成光的辐射光谱分布以及光谱宽度时通常使用“波长线宽（Wavelength Linewidth）”来描述，其形式公式为：[...]
Answer

\(\Delta\lambda= \frac{\lambda^{2}}{hc}m.k_{b}T\)

其中
- \(\Delta\lambda\) 是波长线宽，即发射光谱的宽度.
- \(\lambda\) 是光源发射的中心波长.
- \(h\)是普朗克常数，其值约为\(6.626×10^{−34}Js\).
- \(c\) 是光速，在真空中约为\(3×10^{8}m/s\).
- \(m.k_{B}T\) 是一个表示热力学效应的乘积因子，用于调整波长的计算，在辐射效应上的直接体现是否可以被看做是一种光子能量差（the photon energy difference）.


statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill





Flashcard 7624939408652

Tags
#has-images


Question

在LASER的光学腔中，两种材料的1D多层光栅，入射光会出现多次反射与折射。光栅的周期性结构使得只有特定波长的光（布拉格波长\(\lambda_{B}\)）在光栅之间来回反射时相位保持一致，从而得到增强。这个波长\(\lambda_{B}\)由布拉格方程确定： [...]

Answer

\(2n\Lambda=\lambda_{B}l\)

其中\(n\)为折射系数，\(\Lambda\)为光栅周期，\(l\)为一些整数光栅阶数


statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill