Paper: <a href="https://www.spiedigitallibrary.org/journals/advanced-photonics-nexus/volume-4/issue-02/026011/Compact-narrow-linewidth-solid-state-193-nm-pulsed-laser-source/10.1117/1.APN.4.2.026011.full?webSyncID=c190cb69-e015-d9e2-53db-1da69bae6b18&sessionGUID=4490275d-4b85-9d17-1584-633589b69e6d" rel="nofollow">https://www.spiedigitallibrary.org/journals/advanced-photoni...</a>