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This article is based on domestic self-development 20/400Μm power delivery optical fiber(PDF), using KHF2 solution, glass frosting paste and hydrofluoric acid as the etchant, and adopts segmented etching method, and composite application of the etchant to prepare a gradient structured cladding light filter (CLS). When the CLS prepared has 343W pump light power input, the output power is only 2.22W, and the power attenuation coefficient is 21.9dB; For get high power laser delivery in power delivery fiber’ cladding as real application scenarios, we developed 19/400μm double clad ytterbium doped fiber used in fiber laser, our CLS can filter out 208W cladding light while 1173W real laser input, and the CLS operating temperature is stable below 45°C. The CLS performance can meet the application requirements of high-intensity fiber lasers and ensure the high beam quality and stability of high-intensity fiber lasers.
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