周期极化铌酸锂晶体 PPLN
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随机周期长度偏差对准相位匹配波导中差频效率的影响要比随机占空比偏差的影响来得大，这与单块周期极化晶体中的情况类似。
With the same magnitude, random period error casts much larger effect on the conversion efficiency than random duty cycle error, which is similar with the case in bulk crystals.
KTP晶体具有很高的电导率，给利用外加电场法进行周期极化反转带来困难。
The periodical polarization reversion of KTP crystal utilizing electric field suffers from it's high conductivity.
本文利用铁电晶体自发极化产生的强大周期性表面势，首次提出新的自由电子激光原理。
A new principle for free electron lasers is proposed for the first time by using very strong surface periodic potential caused by the spontaneous polarization of ferroelectric single crystals.
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