Journal of the Optical Society of America B · 1997 · 28 citations · 9 references
EngineeringLaser ScienceLaser PhysicsLaser ApplicationsLaser AblationHigh-power LasersSlope EfficiencyOptical PropertiesSapphire PumpingLaser ManufacturingOptical PumpingPulsed 28-μM Er^3+Liyf_4 LaserPhysicsLaser Beam PropagationPulsed TiLaser-induced BreakdownApplied PhysicsHigh-energy LasersLaser-surface InteractionsComputer Simulation
A slope efficiency of 40% from an Er3+:LiYF4 laser is demonstrated under pulsed Ti:sapphire pumping at 973 nm. With reduction of the pump-pulse duration a significant decrease of the slope efficiency and an increase of the threshold is observed in the experiment and confirmed with high accuracy in a computer simulation. This behavior is due to interionic upconversion from the lower laser level, which leads to energy recycling into the upper laser level. The upconversion rate is negative at threshold but increases strongly with rising pump-pulse energy, thus enhancing the slope efficiency. The conditions are derived that are necessary for achieving the high slope efficiency of the energy-recycling regime.
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Investigation of diode-pumped 28-μm Er:LiYF_4 lasers with various doping levels
T. Jensen, B. H. T. Chai, A. Diening et al. · Optics Letters · 1996 · 121 citations
Efficient resonantly pumped 28-μm Er^3+:GSGG laser
Robert C. Stoneman, L. Esterowitz · Optics Letters · 1992 · 99 citations