作者selenite (萬榮 丹大)
看板Physics
標題Re: [問題] 短脈衝雷射的電場強度
時間Sat Jul 24 08:16:19 2010
sorry I haven't checked your calculation but assume they are right.
Please check laser ionization with google.
Briefly speaking, ionization depend on laser frequency and intensity. You need either
multi-photon ionization order tuneling effect. Don't forget typical fs laser is operated
in infrared range, and this is far from ionization potential of atom.
However , if you are talking about ultra-chirpped XUV pulse, then of course you can
easily ionize.
I think most of application of ultrafast laser need to deal with ionization. I don't
understand why you can't find it.
※ 引述《MrCafe (哈啦Cafe)》之銘言：
: 一般femtosecond laser 用W=E^2/377計算他peak的電場強度,
: 多半可以到 10^12 V/m 以上，以10^12 V/m來說，也就是說
: 1 micrometer 有 1M Volt，或說每 1 Angstrom 有 100V。
: 這麼大的電位差，不論是金屬還是介電質，電子是不是應該早
: 就游離了呢？但做超快雷射的paper好像都沒去提到這個問題。
: 就算電場只有 10^6 V/M，如果是在金屬表面，還是很難想像在
: 1 micrometer內，金屬會有 1V的電位差？
: 想問我少了什麼觀念呢？謝謝！
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