Abstract
We design an ytterbium-doped large mode area (LMA) photonic crystal fiber (PCF) for amplifying high-energy nanosecond laser pulses. This fiber exhibits unique properties such as very large mode area, low attenuation high overlapping factor and low bending loss [1]. These properties help amplify with high peak power nanosecond pulses with less distortion and high energy. To meet these requirements, we design an ytterbium doped double clad microstructured fiber laser in Q-switched mode. From the numerical simulation of the analytical model, we confirm that the large core and large pitch of this fiber plays an indispensable role in amplifying high-energy nanosecond pulses.
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