IR-to-visible image upconverter under nonlinear crystal thermal gradient operation.
IR-to-visible image upconverter under nonlinear crystal thermal gradient operation.
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DOI:
10.1364/oe.26.001133
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发表时间:
2018-01
期刊:
影响因子:
3.8
通讯作者:
H. Maestre;A. Torregrosa;C. Fernández-Pousa;J. Capmany
中科院分区:
文献类型:
--
作者:
H. Maestre;A. Torregrosa;C. Fernández-Pousa;J. Capmany
In this work we study the enhancement of the field-of-view of an infrared image up-converter by means of a thermal gradient in a PPLN crystal. Our work focuses on compact upconverters, in which both a short PPLN crystal length and high numerical aperture lenses are employed. We found a qualitative increase in both wavelength and angular tolerances, compared to a constant temperature upconverter, which makes it necessary a correct IR wavelength allocation in order to effectively increase the up-converted area.