  In this paper we explore the application of low-loss multimode anti-resonant
hollow-core fiber (MM-AR-HCF) in the delivery of nanosecond laser pulses at 1
um wavelength. MM-AR-HCF of large core offers a rich content of low-loss
higher-order modes which plays a key role in the efficient coupling and
transmission of high-power laser of degraded beam quality. In the experiment,
laser pulses of an average pulse energy of 21.8 mJ with 14.6 ns pulse width
(corresponding a peak power of 1.49 MW) are transmitted through MM-AR-HCF of
9.8 m length without damaging. Up to 94 % coupling efficiency is achieved where
the incident laser beam suffers a degraded beam quality with and of 2.18 and
1.99 respectively. Laser-induced damage threshold (LIDT) of MM-AR-HCF measures
22.6 mJ for 94 % coupling efficiency, which is 7 times higher than that for
multimode silica optical fiber with a core diameter of 200 um.
