SELF-FOCUSING AND SELF-DEFOCUSING BY CASCADED 2ND-ORDER EFFECTS IN KTP
SELF-FOCUSING AND SELF-DEFOCUSING BY CASCADED 2ND-ORDER EFFECTS IN KTP
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DOI：
10.1364/ol.17.000028
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发表时间：
1992-01-01
期刊：
影响因子：
3.6
通讯作者：
VANHERZEELE, H
中科院分区：
文献类型：
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作者：
DESALVO, R;HAGAN, DJ;VANHERZEELE, H
我们使用Z-SCAN技术监视了级联的CHI（2）：CHI（2）在KTP上产生的诱导相变（2）过程。观察到这种非线性折射会改变符号，因为根据理论，晶体通过相匹配角旋转。该理论预测了N2eff的最大小信号有效非线性折射率，其含量为equal-equal-to +/- 2 x 10（-14）cm2/w（+/- 1 x 10（-11）ESU）对于该1毫米厚的晶体，从相匹配中+/- 5-d-grees失谐，测得的D（EFF）为3.1 pm/v。对于固定相不匹配，此N2eff与长度和D（EFF）2线性缩放；但是，对于最大N2EFF，非线性相变形变为sublinear，并在PI/4附近的相移具有辐照度。
We monitor the induced phase change produced by a cascaded chi(2):chi(2) process in KTP near the phase-matching angle on a picosecond 1.06-mu-m-wavelength beam using the Z-scan technique. This nonlinear refraction is observed to change sign as the crystal is rotated through the phase-match angle in accordance with theory. This theory predicts the maximum small-signal effective nonlinear refractive index of n2eff is-approximately-equal-to +/- 2 X 10(-14) cm2/W (+/- 1 X 10(-11) esu) for an angle detuning of +/- 5-degrees from phase match for this 1-mm-thick crystal with a measured d(eff) of 3.1 pm/V. For a fixed phase mismatch, this n2eff scales linearly with length and as d(eff)2; however, for the maximum n2eff the nonlinear phase distortion becomes sublinear with irradiance for phase shifts near pi/4.