c******k
发帖数: 1140 | 1 实验室有一femtosecond fiber laser, 能输出optical pusle@1550nm with 80fs.因为
不想搭光路，请问什么光器件或者设备能使fiber laser输出的pulse的宽度fs级别变成
ps 级别的？比如输出变成 1～2ps 的 optical pulse。谢啦 |
w*******e
发帖数: 83 | 2 偶这是自己瞎想的,可不可行不保证,飞秒激光器的线宽要比ps pulse的线宽宽，如果能
把fs激光器的线宽减小，pulse就可变长了。可以用http://en.wikipedia.org/wiki/Prism_compressor 上fig1的方法，在第二个prism后面加一个狭缝，只让一部分线宽的光通过。 |
r******l
发帖数: 121 | 3 If you do not care about chirp, I agree with Bingxiang that just a section
of normal fiber is enough.
If you do care about chirp, you can use a narrow-passband filter, such as
fiber grating. |
c******k
发帖数: 1140 | 4 这种方法，脉冲得spectal width 是否变化。飞秒脉冲得spectral width 是24nm,经过
光线色散，变成皮秒脉冲，此时spectral width 是多少？是否根据time-bandwidth
product, 皮秒脉冲得spectral width 变小了？？ |
c******k
发帖数: 1140 | 5 Sure, I do care about chirp. You mean we need to order a fiber grating
device with a narrow-passband of a center wavelngth of 1550nm, and then
connect a section of normal fiber?
【在 r******l 的大作中提到】
: If you do not care about chirp, I agree with Bingxiang that just a section
: of normal fiber is enough.
: If you do care about chirp, you can use a narrow-passband filter, such as
: fiber grating.
|
r******l
发帖数: 121 | 6 Yes.
Another solution is to use double prism pair, and put a slit-aperture in
between to serve as the narrow-passband filter. This could be even better
than the fiber grating because this will not introduce severe GVD, etc.
【在 c******k 的大作中提到】
: Sure, I do care about chirp. You mean we need to order a fiber grating
: device with a narrow-passband of a center wavelngth of 1550nm, and then
: connect a section of normal fiber?
|
l*b
发帖数: 4369 | 7 如果用filter降频宽的方法来展宽脉冲，频宽变小。
如果用色散扩张的办法来展宽，频宽不变。因为被色散展宽脉冲不是transform-
limited.
【在 c******k 的大作中提到】
: 这种方法，脉冲得spectal width 是否变化。飞秒脉冲得spectral width 是24nm,经过
: 光线色散，变成皮秒脉冲，此时spectral width 是多少？是否根据time-bandwidth
: product, 皮秒脉冲得spectral width 变小了？？
|
w*******e
发帖数: 83 | 8 为什么色散的方法频宽不变啊？不都是复利叶变换吗？脉冲越小，复利叶变换后频谱变
宽。
【在 l*b 的大作中提到】
: 如果用filter降频宽的方法来展宽脉冲，频宽变小。
: 如果用色散扩张的办法来展宽，频宽不变。因为被色散展宽脉冲不是transform-
: limited.
|
