A large mode field single-mode fiber with heterogeneous helical cladding structure
A technology of single-mode fiber and large mode field, applied in the direction of multi-layer core/cladding fiber, cladding fiber, etc., can solve the problems of power capacity limitation, and achieve the effect of easy preparation, simple structure and flexible adjustment
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Embodiment 1
[0023] Embodiment 1, the fiber core 1, the first cladding layer 2 and the second cladding layer 3 are all made of phosphate glass material, the fiber core is doped with Yb3+, the wavelength of the emitted laser light is 1.064 μm, the fiber core 1, the first cladding layer 2 and the refractive index of the second cladding layer 3 are n 1 , n 2 and n3 , and satisfy the relation: n 2 ≤n 1 3 , the core diameter is 50 microns, the ratio of the radii of the first cladding 2 and the second cladding 3 to the core 1 is 2:1, and the length ratio of the second cladding 3 and the first cladding 2 along the fiber axis The relationship is 1:3. The leakage loss coefficient of the high-order mode is large, the higher the mode order is, the larger the leakage loss coefficient is, and the leakage loss coefficient of the fundamental mode is the smallest. When the gain coefficient of the fiber core is greater than the loss coefficient of the fundamental mode and smaller than the leakage loss c...
Embodiment 2
[0024] Example 2, the core 1, the first cladding 2 and the second cladding 3 are all made of germanate glass material, the core is doped with Tm3+, the wavelength of the emitted laser is 2.0 μm, the core 1, the first cladding 2 and the refractive index of the second cladding 3 are n 1 , n 2 and n 3 , and satisfy the relation: n 2 ≤n 1 3 , the diameter of the core 1 is 100 microns, the ratio of the radii of the first cladding 2 and the second cladding 3 to the core 1 is 1.5:1, and the length of the second cladding 3 and the first cladding 2 along the fiber axis The ratio relationship is 1:6. The leakage loss coefficient of the high-order mode is large, the higher the mode order is, the larger the leakage loss coefficient is, and the leakage loss coefficient of the fundamental mode is the smallest. When the gain coefficient of the fiber core is greater than the loss coefficient of the fundamental mode and smaller than the leakage loss coefficient of the high-order mode, it c...
Embodiment 3
[0025] Example 3, the fiber core 1, first cladding 2, second cladding 3 and third cladding 4 are all made of tellurite glass material, the core is doped with Er3+, and the emitted laser wavelength is 2.7 μm , the refractive indices of the core 1, the first cladding 2, the second cladding 3 and the third cladding 4 are n 1 , n 2 , n 3 and n 4 , and satisfy the relation: n 4 2 ≤n 1 3 , the core diameter is 50 microns, the ratio of the radius of the first cladding layer 2 and the second cladding layer 3 to the fiber core 1 is 2:1, the ratio of the radius of the third cladding layer 4 to the fiber core 1 is 0.5:1, the second The length ratio between the second cladding layer 3 and the first cladding layer 2 along the fiber axis is 1:3. The leakage loss coefficient of the high-order mode is large, the higher the mode order is, the larger the leakage loss coefficient is, and the leakage loss coefficient of the fundamental mode is the smallest. When the gain coefficient of the f...
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