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A Structure for Improving the Second Harmonic Conversion Efficiency of Microfiber Surface

A second harmonic and conversion efficiency technology, applied in the field of microstructure, can solve the problem of weak photosensitive properties of pure silica, achieve the effect of enhancing the second nonlinear overlap integral on the surface of micro-fibers and improving the conversion efficiency

Active Publication Date: 2016-01-20
NANJING UNIVERSTIY SUZHOU HIGH TECH INST
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Problems solved by technology

Due to the weak photosensitive properties of pure silica, the χ formed by pump light and second harmonic multiphoton process cannot be used (2) The grating model explains this phenomenon

Method used

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  • A Structure for Improving the Second Harmonic Conversion Efficiency of Microfiber Surface
  • A Structure for Improving the Second Harmonic Conversion Efficiency of Microfiber Surface
  • A Structure for Improving the Second Harmonic Conversion Efficiency of Microfiber Surface

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Taking the tapered microfiber whose core is silica and cladding is air as an example, the principle of the present invention is as follows:

[0021] Ignoring the pump loss and using the small-signal limit approximation, the SHG process can be expressed by the following equation:

[0022] dA 2 dz - i ρ 2 A 1 2 exp ( iΔβz ) = 0 - - - ( 1 )

[0023] where A 1 , A 2 are the amplitudes of the fundamental mode and the second harmonic signal light field, Δβ=2β 1 -β 2 is the mismatch between the fundamental ...

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Abstract

The invention provides a structure for increasing secondary harmonic conversion efficiency of a micro-fiber surface. The structure is a groove structure along the length direction of the tapering micro-fiber, and the groove structure is located on the waist of the tapering micro-fiber. The cross section of the groove structure takes the shape of a rectangle, V-shape, rounded rectangle and the like, and the micro-fiber is allowed to be provided with a dual-groove structure and a multi-groove structure in addition to a single-groove structure. The introduction of the groove structure can enlarge the micro-fiber surface area, and effectively enhance the optical field strength of the optical fiber surface, thereby enhancing the secondary nonlinear overlapping integration of the micro-fiber surface, and improving the conversion efficiency of the secondary harmonic conversion efficiency on the micro-fiber surface.

Description

technical field [0001] The invention relates to a microstructure, in particular to a microfiber groove structure. Background technique [0002] Harmonic generation is a common nonlinear phenomenon that can be used to generate light in the visible and ultraviolet regions. [0003] Strictly speaking, second harmonic generation (SHG) does not occur in silica fibers because silica (SiO 2 ) glass structure exhibits an inversion symmetry, derived from the second-order susceptibility χ (2) All non-linear effects of will not occur. However, several early experiments showed that when an intense 1.06 μm pump pulse from a Nd:YAG laser is transmitted in an optical fiber, a second harmonic is generated. The conversion efficiency of the sum frequency and the second harmonic process is about 0.1%. Such a high conversion efficiency cannot be explained by the surface nonlinearity of the core-cladding interface and the nonlinearity derived from the electric quadrupole moment and magnetic d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/35G02F1/37
Inventor 徐飞罗炜陆延青胡伟
Owner NANJING UNIVERSTIY SUZHOU HIGH TECH INST
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