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A method for finely tuning second-order nonlinear optical processes

A kind of nonlinear optics and fine technology, applied in the field of nonlinear optics, can solve the problem that the energy and phase cannot be controlled continuously and finely tuned at the same time, and achieve the effect of large degree of control freedom

Active Publication Date: 2021-06-22
NANJING UNIV
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Problems solved by technology

[0010] In order to solve the problem that the traditional QPM and RQPM methods cannot continuously control and simultaneously finely regulate the energy and phase in the nonlinear process, the present invention proposes an improved method, and the specific improvement scheme is as follows:

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  • A method for finely tuning second-order nonlinear optical processes
  • A method for finely tuning second-order nonlinear optical processes
  • A method for finely tuning second-order nonlinear optical processes

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Embodiment Construction

[0022] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] The specific parameters are set as follows: the length of the superlattice is 0.3cm, the fundamental wave with a wavelength of 1064nm is incident from the left end face of the superlattice, and a frequency doubled wave with a wavelength of 532nm is generated through the superlattice.

[0024] figure 2 It shows that when 0≤φ<π / 2, with the increase of φ, the conversion efficiency of frequency doubled wave at the superlattice exit end decreases; when 3π / 2<φ≤2π, with the increase of φ, the superlattice exit The conversion efficiency of double frequency wave at the end is increased. In the above two cases, the energy flow direction is transferred from the fundamental wave to the double frequency wave, so effective double frequency wave output can be realized.

[0025] image 3 It is shown that when 0≤φ<...

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Abstract

The invention discloses a method for finely regulating the second-order nonlinear optical process through artificial microstructure design. The traditional quasi-phase matching (QPM) theory provides phase matching to nonlinear processes by designing optical superlattices, where the period of optical superlattices is determined by the wave vector mismatch in nonlinear processes. Theoretical calculations show that this method cannot strictly ensure the unidirectionality of energy and phase transformation in the nonlinear process, and will produce significant errors in the case of high conversion efficiency, and it is difficult to adjust the harmonic phase while phase matching. The present invention proposes to introduce the parameter of relative phase difference angle when designing the superlattice structure. By selecting a suitable relative phase difference angle, the energy change and phase change of the double frequency wave or fundamental wave in the nonlinear process can be finely regulated. It has important applications in improving the conversion efficiency of nonlinear processes.

Description

technical field [0001] The invention belongs to the field of nonlinear optics, and in particular relates to nonlinear optical energy control and phase matching technology in artificial microstructure materials, wherein the optical superlattice used can be designed according to preset frequency doubled waves and fundamental frequency waves. Background technique [0002] Nonlinear optics is an important field in modern optics, and it is a discipline that studies the interaction between strong light and medium. Second-order nonlinear optical effects such as frequency doubling, sum frequency, and difference frequency have always been the focus of attention in this field. Using the second-order nonlinear coefficients of natural nonlinear materials, second-order nonlinear processes such as frequency conversion can be realized. However, the phase mismatch due to the dispersion of the materials reduces the conversion efficiency. Taking frequency doubled light as an example, Δk=k ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00G02F1/35
CPCG02B27/0012G02F1/353
Inventor 冯霞杨波秦亦强张超朱永元洪煦昊赵瑞智陈涌创邹谨成
Owner NANJING UNIV
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