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Investigation on Improving ADP Crystals’ Thermal Stability for Noncritical Phase‐Matching Fourth Harmonic Generation Application
Author(s) -
Wang Zongqi,
Teng Bing,
Hu Chen,
Gao Han,
Liu Hong,
Zhong Degao,
Tang Jie,
Ji Shaohua
Publication year - 2018
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201800088
Subject(s) - ammonium dihydrogen phosphate , materials science , thermal stability , full width at half maximum , thermodynamics , chemistry , optoelectronics , physics , organic chemistry , fertilizer
Abstract 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.