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Optical frequency converter of optical fiber integrated layered gallium selenide nanosheet and preparation method

A nanosheet and gallium selenide technology, applied in the field of nonlinear optics, can solve the problems of low fiber coupling efficiency, fragile devices, poor repeatability, etc., and achieve the effect of strong frequency doubled light or sum frequency light output and high damage threshold.

Pending Publication Date: 2020-06-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also researchers who embed two-dimensional materials between two ordinary single-mode fibers with aligned cores to stimulate second-order nonlinear optical effects, but the coupling efficiency with the fibers is too low, and there are many problems such as too fragile devices and poor repeatability.

Method used

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  • Optical frequency converter of optical fiber integrated layered gallium selenide nanosheet and preparation method
  • Optical frequency converter of optical fiber integrated layered gallium selenide nanosheet and preparation method
  • Optical frequency converter of optical fiber integrated layered gallium selenide nanosheet and preparation method

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Embodiment 1

[0038] Embodiment 1: see attached figure 1 , attached figure 2 , attached image 3 And attached Figure 4 , the required micro-nano optical fiber is drawn by the optical fiber flame tapering technology. In the drawing process, the factors such as the drawing speed, the distance between the flame and the optical fiber, the airflow disturbance in the environment, and the vibration of the experimental bench can be controlled to draw the fiber. Micro-nano fiber that meets the requirements. According to this drawing method, it can be guaranteed that the drawn micro-nano fiber has excellent compatibility and lower transmission loss with common single-mode fiber; in specific embodiment 1, the length of the drawn micro-nano fiber is 5mm, with a diameter of 3.12μm, in the wavelength range of 750-800nm ​​and 1500-1600nm, after integrating gallium selenide nanosheets 1, the transmission loss is less than 3dB, which prepares a lot for the generation of strong second harmonics on the d...

Embodiment 2

[0040] Embodiment 2: see attached Figure 5 , will attach image 3 The pump light source in is replaced by a continuous laser, which can also achieve strong second harmonic excitation.

[0041] Compared with pulsed laser as pumping light, using continuous laser as pumping light has many advantages. For example, pulsed laser is discrete in time. The frequency difference will introduce dispersion. After long-distance transmission of communication optical fiber, this difference will be amplified, so that the pulse will be broadened in time. When the transmission distance is long enough, the pulse broadening effect will make two temporally adjacent The pulses of the spatially coincide too much to be resolved, which is unacceptable in a communication system. However, this problem can be solved by using continuous laser as pump light. Continuous laser is continuous in time and contains only a few frequency components in the frequency domain, so it has very low dispersion and makes...

Embodiment 3

[0043] Embodiment 3: see attached Image 6 , will attach image 3 When the pump light source in is replaced by a wavelength-tunable continuous laser, a strong second harmonic can be excited in a wide spectral range.

[0044] Under the condition that the diameter of the micro-nano fiber taper is fixed, it can be known through numerical simulation that although there is only one wavelength that completely satisfies the phase-matching condition, the mode refractive index of the fundamental mode of the pump light and the second harmonic higher-order mode is relatively dependent on the wavelength. Weak, so that the phase detuning amount is small in a large pump wavelength range, and the process of the proposed optical frequency converter to excite the second harmonic is non-resonant excitation, so the pump light wavelength can be tuned in a large wavelength range, thus A strong second harmonic output can be obtained in a certain range of wavelengths.

[0045] when attached imag...

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Abstract

The invention relates to an optical frequency converter of an optical fiber integrated layered gallium selenide nanosheet and a preparation method; the method includes that Gallium selenide nanosheetsare integrated on the surface of a micro-nano optical fiber, pulse laser or continuous laser serves as pump light, the cross section of the micro-nano optical fiber has high power density, the surface of the optical fiber has a high evanescent field, and frequency doubling light or sum frequency light can be efficiently generated by combining the characteristic of high second-order optical nonlinear polarizability of the gallium selenide nanosheets 1. After the micro-nano optical fiber is integrated with the gallium selenide nanosheet, the intensity of the second harmonic is improved by fourorders of magnitudes. Numerical simulations indicate that the mode refractive index of the pump light fundamental mode, the frequency doubling light or the sum frequency light high-order mode has lessdependence on wavelength; moreover, the gallium selenide nanosheet has a relatively high damage threshold, and theoretically, the power of the frequency-doubled light or sum-frequency light and the power of the pump light are in a square relationship, so that stronger frequency-doubled light or sum-frequency light output can be realized in a very wide wavelength range as long as the power of thepump light is further improved.

Description

technical field [0001] The invention relates to an optical frequency converter and belongs to the technical field of nonlinear optics. Specifically relates to an optical frequency converter and a preparation method of an optical fiber integrated layered gallium selenide nanosheet. Background technique [0002] Frequency doubling and sum frequency are typical second-order nonlinear optical phenomena. In recent years, researchers have used the frequency doubling effect to generate green, red and other lasers, which are widely used in many fields. Only materials without central inversion symmetry can produce second-order nonlinear optical effects, and materials that can produce second-order nonlinear optical effects can generally produce weak third-order nonlinear optical effects, but can produce third-order nonlinear optical effects. Materials with linear optical effects may not be able to produce second-order nonlinear optical effects. For example, inert gases can produce st...

Claims

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Application Information

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IPC IPC(8): G02F2/02G02F1/35
CPCG02F2/02G02F1/353G02F1/3544
Inventor 姜碧强郝臻纪亚飞侯跃国弋瑞轩毛东甘雪涛赵建林
Owner NORTHWESTERN POLYTECHNICAL UNIV
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