Investigation on Improving ADP Crystals’ Thermal Stability for Noncritical Phase‐Matching Fourth Harmonic Generation Application
Investigation on Improving ADP Crystals’ Thermal Stability for Noncritical Phase‐Matching Fourth Harmonic Generation Application
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DOI：
10.1002/crat.201800088
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发表时间：
2018-07
影响因子：
1.5
通讯作者：
Zongqi Wang;B. Teng;Chen Hu;Han Gao;Hong Liu;Degao Zhong;Jie Tang;S. Ji
中科院分区：
文献类型：
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作者：
Zongqi Wang;B. Teng;Chen Hu;Han Gao;Hong Liu;Degao Zhong;Jie Tang;S. Ji
由于具有较高的非线性光学系数，磷酸二氢铵(ADP)晶体的四倍频(FHG)效率高于氚化磷酸二氢钾(DKDP)晶体。然而，较窄的半高全宽温度带宽和较差的热稳定性限制了其在非临界相位匹配(NCPM)FHG中的应用。本文采用点籽晶快速生长的方法生长了ADP和一系列氚代ADP(DADP)晶体，为提高ADP晶体的热稳定性提供了可行的实验条件，用于NCPM FHG。掺氢实验结果表明，60%的dADP晶体在倍频过程中具有较大的激光感生热容，可以获得较高的倍频输出，但热稳定性较差。因此，用空气间接加热法测量60%dADP晶体的倍频稳定性。与铜直接加热相比，获得稳定的倍频输出约7%，更适合于ADP/dADP晶体的倍频稳定性。
Ammonium dihydrogen phosphate (ADP) crystals have higher fourth harmonic generation (FHG) efficiency than deuterated potassium dihydrogen phosphate (DKDP) crystals, because of the higher nonlinear optical coefficient. However, the narrower full‐width at half‐maximum (FWHM) temperature bandwidth and poor thermal stability limited the application in the noncritical phase‐matching (NCPM) FHG. In this article, ADP and a series of deuterated ADP (DADP) crystals are grown through point‐seed rapid growth method to investigate a feasible experimental condition on improving ADP crystals' thermal stability for NCPM FHG application. The deuterium doping experiment results indicate that the 60% DADP crystal could accommodate more laser‐induced heat capacity during FHG processing and could achieve higher FHG output, but with poor thermal stability. Therefore, 60% DADP crystal's FHG stability measured by air indirect heating method. About 7% more stable FHG output is obtained than direct heating by copper, which is more suitable for FHG stability of ADP/DADP crystals.