Title :
Spectroscopy and diode laser-pumped operation of Tm,Ho:YAG
Author :
Fan, Tso Yee ; Huber, G. ; Byer, Robert L. ; Mitzscherlich, P.
Author_Institution :
Edward L. Ginzton Lab., Stanford Univ., CA, USA
fDate :
6/1/1988 12:00:00 AM
Abstract :
Spectroscopic measurements and analysis of diode laser-pumped operation of Tm,Ho:YAG at 2.1 mu m at room temperature have been performed. The peak effective stimulated emission cross section is measured to be 9*10/sup -21/ cm/sup 2/ at 2.091 mu m and the upper state lifetime is 8.5 ms. Under diode laser pumping, thresholds of 4.4 mW of absorbed power and slope efficiency of 19% have been demonstrated. Calculations of threshold power are performed based on the spectroscopic measurements. An energy transfer upconversion process is identified which leads to a sublinear rise in upper-state population with pump power.<>
Keywords :
holmium; optical pumping; radiative lifetimes; solid lasers; stimulated emission; thulium; 2.091 micron; 2.1 micron; 4.4 mW; 8.5 ms; Tm,Ho:YAG; YAG:Tm,Ho; YAl5O12:Tm,Ho; absorbed power; diode laser-pumped operation; energy transfer upconversion process; peak effective stimulated emission cross section; pump power; room temperature; slope efficiency; spectroscopic measurements; thresholds; upper state lifetime; upper-state population; Diode lasers; Energy exchange; Laser excitation; Performance analysis; Performance evaluation; Power measurement; Pump lasers; Spectroscopy; Stimulated emission; Temperature;
Journal_Title :
Quantum Electronics, IEEE Journal of
