In:
Journal of the Optical Society of America B, Optica Publishing Group, Vol. 37, No. 12 ( 2020-12-01), p. 3857-
Abstract:
A novel noncollinear phase-matching (PM) scheme was proposed by
introducing a small tunable angle between two pump beams to maximize the effective nonlinear coefficient ( d e f f ) in tunable terahertz wave difference
frequency generation in the Z n G e P 2 crystal. Compared with the collinear
PM condition, the noncollinear geometry transfers the PM angle to be around θ = 90 ∘ for type-II ( o − e → o ) PM to fully use the maximum
nonlinear coefficient d 36 , leading to a high conversion
efficiency improved by tens of times in theory. Based on the theory of noncollinear PM, the angle-tuning characteristics were calculated and
the crystal design was provided for efficient outcoupling. A rigorous theoretical model was built under small-signal approximation to show
the affecting factors of noncollinear PM and reveal its superiority compared with collinear PM.
Type of Medium:
Online Resource
ISSN:
0740-3224
,
1520-8540
DOI:
10.1364/JOSAB.406034
Language:
English
Publisher:
Optica Publishing Group
Publication Date:
2020
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