A theoretical analysis of optical-to-THz conversion efficiency via optical rectification |
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| Authors: | DeHua Li XiaoDong Qi ShengGang Liu |
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| Affiliation: | (1) Terahertz Institute of Shandong University of Science & Technology, Qingdao, 266510, China;(2) Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, 130033, China;(3) Terahertz research center, Physical Electronics College, University of Electronics Science, Chengdu, 610054, China |
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| Abstract: | A theoretical analysis of an ultra-short pulse converted to Terahertz radiation via optical rectification in nonlinear optical
crystal is presented here; several factors that affect optical-to-THz conversion efficiencies are discussed; pulse durations
affect the conversion efficiency effectively: when crystal length is equal to the optimal crystal length l
c, optical-to-THz conversion efficiency is the highest, but for the periodically-inverted electro-optic crystals, conversion
efficiency is almost proportional to the crystal length when absorption can be neglected. Taking account of the absorption
of crystals, effective length of crystal is L
eff=0.63/α, there is no apparent increase of conversion efficiency and the conversion efficiency approaches to a constant eventually
when the crystal length is increased. |
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| Keywords: | optical rectification periodically inverted effective length conversion efficiency |
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