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.
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[0038] Example 1: See attached figure 1 , Attached figure 2 , Attached image 3 And Figure 4 , Use the fiber flame taper technology to draw the required micro-nano optical fiber. During the drawing process, control the drawing speed, the distance between the flame and the optical fiber, the airflow disturbance in the environment, and the vibration of the experimental platform to draw Meet the requirements of micro-nano fiber. According to this drawing method, it can be ensured that the drawn micro-nano fiber has excellent compatibility and low transmission loss with ordinary single-mode fiber; in the specific embodiment 1, the length of the drawn micro-nano fiber is 5mm, diameter of 3.12μm, in the wavelength range of 750~800nm and 1500~1600nm, after integrating gallium selenide nanosheet 1, the transmission loss is less than 3dB, which prepares the device for generating strong second harmonics. Good condition. A 1550nm picosecond pulsed laser 4 is used to provide pump ligh...
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[0040] Example 2: See attached Figure 5 , Will attach image 3 The pump light source in is replaced with a continuous laser, which can also achieve stronger second harmonic excitation.
[0041] Compared with pulsed laser as pump light, using continuous laser as pump light has many advantages. For example, pulsed laser is discrete in time. According to Fourier transform, the pulse will have a certain broadening in the frequency domain. The difference in frequency will introduce chromatic dispersion. After long-distance transmission of communication fiber, this difference will be amplified, making the pulse broadened in time. When the transmission distance is long enough, the pulse broadening effect will make the two adjacent in time The pulses of are too overlapping in space to be distinguishable, which is unacceptable in the communication system. However, this problem can be solved by using continuous laser as the pump light. Continuous laser is continuous in time and contains o...
Example Embodiment
[0043] Example 3: See attached Image 6 , Will attach image 3 When the pump light source in is replaced with a wavelength-tunable continuous laser, it can excite stronger second harmonics in a wider spectral range.
[0044] Under the condition that the diameter of the cone of the micro-nano fiber is fixed, numerical simulation shows that although there is only one wavelength that fully meets the phase matching condition, the mode refractive index of the pump light fundamental mode and the second harmonic high-order mode are relatively dependent on the wavelength. Weak, making the phase detuning smaller in a larger 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 Strong second harmonic output can be obtained in a certain range of wavelengths.
[0045] When attached image 3 When the 1310nm CW laser 6 is replaced with...
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