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IEEE/ICACT20260337 Slide.07        [Big Slide]	Oral Presentation
	It adopts an all-fiber structure, which is composed of a 792 nm pump source, thulium-doped fiber (TDF), fiber Bragg grating (FBG), and saturable absorber (SA). The design concept is innovative yet practical: based on thulium-doped fiber, we use a polarization-maintaining fiber Bragg grating (PM-FBG) to select two specific wavelengths. Meanwhile, a section of unpumped thulium-doped fiber serves as the saturable absorber. Through this combination, we successfully achieve single longitudinal mode output, laying the foundation for the excellent performance of the laser.

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