Laser performance of disordered Yb:Ca3(NbGa)2–xGa3O12 crystal under diode pumping at 974–976 nm

✍ Scribed by J. Liu; H. Yang; H. Zhang; X. Mateos; V. Petrov; J. Wang

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 105 KB
• Volume: 5
• Category: Article
• ISSN: 1612-2011
• DOI: 10.1002/lapl.200810083

✦ Synopsis

Efficient continuous-wave (CW) laser operation is demonstrated at room temperature with disordered Yb:Ca 3 (NbGa) 2-x Ga 3 O 12 crystal by diode pumping at 974 -976 nm. With 2.0 W of pump power absorbed in a 1.5 mm thick crystal, a CW output power of 0.62 W is generated, resulting in an optical-to-optical efficiency of 31%, while the slope efficiency amounts to 50%. Upon increasing the pump power to a high level, a transient process takes place, in which the output power decreases continuously towards its stationary value.

Absorbed pump power, W 2.5 2.0 1.5 1.0 0.5 0 Output power, W 6 5 4 3 2 1

Slope efficiency: η = 60% Crystal: 2.5 mm thick T = 2%

Relationship between Pout and P abs measured in the transient process of power reduction, giving rise to a slope efficiency of η = 60%