Estimation of the Maximum Output Power of Double-Clad Photonic Crystal Fiber Laser

Abstract

Compared with traditional optical fiber lasers, double-clad photonic crystal fiber (PCF) lasers have larger surfacearea-to-volume ratios. With an increase of output power, thermal effects may severely restrict output power and deteriorate beam quality of fiber lasers. We utilize the heat-conduction equations to estimate the maximum output power of a double-clad PCF laser under natural-convection, air-cooling, and water-cooling conditions in terms of a certain surface-volume heat ratio of the PCF. The thermal effects hence define an upper power limit of double-clad PCF lasers when scaling output power.

Design and fabrication of ytterbium-doped photonic crystal fiber with low non-linearity

“…LMA-PCF based fiber lasers with near diffraction-limited beam quality have been reported in recent years [9,10]. Also, with regard to the traditional optical fiber, the thermal effect problem which mainly arises from the high power density in the fiber core and the poor heat conductivity of the polymer cladding, can be perfectly solved by the double cladded LMA PCF designs [11]. Besides a large mode area, another advantage of the PCF is the extremely high numerical aperture of the inner cladding (NA cladding ), which can effectively improve the pump absorption efficiency.…”

Specific mode output from multimode fiber oscillators by designing rare earth doping profiles

“…In practice, many applications require high-power single-mode laser sources. [1][2][3][4] Mode selection techniques, such as coiling the fiber and tailoring the doping profiles, can be applied to generate the fundamental mode output. Hotoleanu et al [5] have investigated the transverse mode discrimination in multimode fibers by spatially controlling the radial doping distribution; however, the behaviors of the transverse mode competition and the output power distribution of each mode were not discussed, although they were later studied by Gong et al [6] Ye et al [7] confined the Yb doping within a smaller radius in the center of the core of a few-mode large mode area (LMA) fiber.…”