Abstract
We report on laser operation in a (6 at. % Tm, 5 at. % Yb): codoped crystal. The vibrational frequencies of are coupled to the electronic transitions of at 1946 nm, creating virtual final laser levels at higher energy than the ground level of . The longest recorded laser wavelength was 2039 nm, which is longer than permitted by a pure electronic transition in ions in . We show that every laser wavelength can be explained with the electron–phonon coupling effect, where the vibration frequencies were determined through Raman spectroscopy.
©2012 Optical Society of America
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