A diffraction-limited laser of 25/400 Yb3+/Al3+/P5+/F− silica fiber with a zigzag refractive index profile. (31st July 2017)

• Record Type: Journal Article
• Authors: Lin, Zhiquan; Lou, Fengguang; Wang, Meng; Zhang, Guodong; Zhang, Lei; Feng, Suya; Yu, Chunlei; Chen, Danping; Hu, Lili
• Is Part Of: Laser physics. Volume 27:Number 8(2017:Aug.)
• Publication Date: 2017-07-31
• Subjects: fiber lasers -- low-NA -- fiber design and fabrication; Lasers -- Periodicals; 621.36605
• DOI: 10.1088/1555-6611/aa7376
• Languages: English
• ISSNs: 1054-660X

Abstract

Abstract: In this work, a Yb 3+ /Al 3+ /P 5+ /F − co-doped low-NA preform with larger than 0.4 wt.% Yb 3+ doping concentration and zigzag refractive index profile was fabricated based on solution doping modified chemical vapor deposition technology. The modality of the preform refractive index profile was simulated based on a circle-symmetry-distribution fiber model. According to the simulation results a step-index 25/400 double cladding fiber with core NA of ~0.04 was drawn. Pumped with a 970 nm laser diode, a diffraction-limited oscillator-laser output with ~71% slope efficiency and M 2 of ~1.06 were achieved at bending diameter ⩾50 cm after stripping cladding light. For bending diameters less than 50 cm, the laser efficiency measured at stripping cladding light decreases with decrease in bending diameter.