Simultaneous Type-I and Type-II phase matching for second-order nonlinearity in integrated lithium niobate waveguide

We describe a wavelength conversion experiment (generation of a pulse at the wavelength λp - Δλ from a signal at λp+Δλ under the action of a pump at λp) performed through cascaded second-order process in a lithium niobate channel waveguide. With a 58-mm-long Ti diffused channel waveguide, λp=1.1 μ m (the wavelength of phase matching for the first step of sh generation), Δλ of several nanometers and 20 ps pulse duration, wavelength conversion with unit efficiency is obtained with a pump pulse energy of the order of 102 pJ. The experimental results are successfully interpreted by making use of modal analysis and solving the appropriate nonlinear equations.

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Bandwidth analysis of non-collinear fourth and fifth harmonic generation in nonlinear uniaxial crystals

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s021886351750014x ◽

2017 ◽

Vol 26 (01) ◽

pp. 1750014

Author(s):

Dongsheng Song ◽

Yuanlin Zheng ◽

Xiaohui Zhao ◽

Zengyan Cai ◽

Xianfeng Chen

Keyword(s):

Numerical Calculation ◽

Harmonic Generation ◽

Phase Matching ◽

Type I ◽

Type Ii ◽

Optimal Angle ◽

Fourth Harmonic ◽

Calculation Results ◽

Bandwidth Analysis

The optimal angle bandwidth and wavelength bandwidth of fourth-harmonic generation (FHG) and fifth-harmonic generation (FIFHG) of the 1064[Formula: see text]nm laser are analyzed based on the numerical calculation results of non-collinear type-I and type-II phase matching processes for general nonlinear uniaxial crystals with 1[Formula: see text]cm length. The non-collinear phase matching angles and effective nonlinear coefficients of FHG and FIFHG are calculated. The optimal angle bandwidth and wavelength bandwidth are obtained. The results are beneficial to broadband and efficient non-collinear phase matching FHG and FIFHG experiments and studies.

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ENHANCING CONVERSION EFFICIENCY IN THE SECOND-ORDER NONLINEAR OPTICAL PHENOMENA

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863504002080 ◽

2004 ◽

Vol 13 (03n04) ◽

pp. 445-449

Author(s):

JONGBAE KIM ◽

JUNG JIN JU ◽

MIN-SU KIM

Keyword(s):

Harmonic Generation ◽

Conversion Efficiency ◽

Nonlinear Optical ◽

Second Harmonic ◽

Second Order ◽

Phase Matching ◽

Quasi Phase Matching ◽

Optical Phenomena ◽

Nonlinear Optical Phenomena ◽

Second Order Nonlinearity

The distributions of electric field and the induced second-order nonlinearity are discussed in a poling scheme where the width of a periodic electrode is shorter than the conventional coherent length. The theoretical aspects of quasi-phase matching for a subsequent experiment in second harmonic generation are analyzed. The present analysis consistently explains that the conversion efficiency can be enhanced if the electrode width is shortened, and maximized if the electrode width is optimized.

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