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Quantum memory is a fundamental building block for large-scale quantumnetworks. On-demand optical storage with a large bandwidth, a high multimodecapacity and an integrated structure simultaneously is crucial for practicalapplication. However, this has not been demonstrated yet. Here, we fabricate anon-chip waveguide in a $\mathrm {^{151}Eu^{3+}:Y_2SiO_5}$ crystal withinsertion losses of 0.2 dB, and propose a novel pumping scheme to enablespin-wave atomic frequency comb (AFC) storage with a bandwidth of 11 MHz insidethe waveguide. Based on this, we demonstrate the storage of 200 temporal modesusing the AFC scheme and conditional on-demand storage of 100 temporal modesusing the spin-wave AFC scheme. The interference visibility between the readoutlight field and the reference light field is $99.0\% \pm 0.6\%$ and $97\% \pm3\%$ for AFC and spin-wave AFC storage, respectively, indicating the coherentnature of this low-loss, multimode and integrated storage device.

On-demand multimode optical storage in a laser-written on-chip waveguide