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Full Laser Equipment Service & Maintenance
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Product Intro
Fiber laser is a device that uses optical fiber doped with rare earth elements (such as ytterbium, erbium, thulium, etc.) as a gain medium and realizes laser output through pump light excitation. It combines optical fiber technology with laser principles and has the advantages of high beam quality, high efficiency, and compact structure. It is one of the mainstream technologies in the current laser field.
Function
1. Using the stimulated radiation mechanism: pump light (usually semiconductor laser) is injected into the doped fiber to stimulate the rare earth ions to transition from the ground state to the excited state, forming a population inversion. When photons pass through, stimulated radiation produces light of the same frequency and phase, which is amplified by the resonant cavity feedback to form a laser.
2. Key elements: doped ions (such as Yb³⁺, Er³⁺) as gain centers, optical fibers as optical waveguides to limit the light field, and pump sources to provide energy.
3. Pump light is injected from the inner cladding of the double-clad fiber. The cladding structure allows the pump light to pass through the fiber core multiple times, improving the energy coupling efficiency.
4. The rare earth ions in the fiber core absorb the pump light energy, release photons through spontaneous radiation or stimulated radiation, and form laser oscillations through the resonant cavity (such as a reflector composed of a fiber grating).
5. Usually a high-power semiconductor laser (LD), the wavelength matches the absorption peak of the doped ions (such as Yb³⁺-doped fiber corresponding to 976nm pump light).
Type
1. Doped fiber: The core is doped with rare earth ions. Common types include ytterbium (Yb), erbium (Er), and thulium (Tm) doped fibers.
2. Double-clad fiber: The inner cladding is the pump light channel (multimode structure), the outer cladding is the protective layer, and the core is a single-mode structure, which achieves high-power pumping and high-quality laser output.
3. It is composed of fiber Bragg grating (FBG), dielectric reflector or circulator, etc., to form an optical feedback path and determine the laser wavelength and mode.
4. It is used for efficient coupling of pump light and optical fiber. Common methods include end coupling and side coupling.
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