Efficient self-frequency-doubling Nd:YCOB laser

摘要

The polarized absorption spectra of Nd:YCOB crystal was measured. Optical properties were studied via Judd-Ofelt analysis. The line strength, intensity parameters, radiative transition rates, life time and branching ratios were calculated. The results were discussed. Using an Ar$+$PLU$/ laser pumped CW tunable Ti:sapphire as a pumping source, the self-frequency doubling laser operation was successfully investigated. The lasing threshold is measured to be 2 mW, the optical-optical conversion efficiency is about 3.7%. To our knowledge, this is the lowest threshold and highest conversion efficiency reported so far.