We propose a point-by-point inscription method for fiber Bragg grating (FBG) fabrication using a femtosecond pulsed laser focused through a fiber polyimide coating. realizing a 2-μm-wavelength-band FBG. A femtosecond laser acts as the inscription laser. focused by a 63× oil lens. https://bbmbatteryes.shop/product-category/1004/