• Publications
  • Influence
Laser beam combining for high-power, high-radiance sources
  • T. Fan
  • Physics
  • IEEE Journal of Selected Topics in Quantum…
  • 10 October 2005
Beam combining of laser arrays with high efficiency and good beam quality for power and radiance (brightness) scaling is a long-standing problem in laser technology. Recently, significant progressExpand
Heat generation in Nd:YAG and Yb:YAG
  • T. Fan
  • Materials Science
  • 1 June 1993
The fractional thermal loading, the ratio of heat generated to absorbed energy, at a 6.5 at.% doped Yb:YAG crystal diode pumped at 0.943 mu m has been measured to be >
Modeling and CW operation of a quasi-three-level 946 nm Nd: YAG laser
A model is developed for an end-pumped quasi-three-level laser with population in the lower laser level at equilibrium such as for transitions to the manifolds4I 9/2 in Nd3+,4I 15/2 in Er3+,5I 8 inExpand
Coherent beam combining and phase noise measurements of ytterbium fiber amplifiers.
Phase noise characterization of a 10-W Yb fiber amplifier is presented, and we demonstrate phase locking of two fiber amplifiers with near-perfect fringe contrast at power levels of as much as 10 WExpand
Cryogenic Yb$^{3+}$-Doped Solid-State Lasers
Cryogenically cooled solid-state lasers promise a revolution in power scalability while maintaining a good beam quality because of significant improvements in efficiency and thermo-optic properties.Expand
Measurement of thermo-optic properties of Y3Al5O12, Lu3Al5O12, YAIO3, LiYF4, LiLuF4, BaY2F8, KGd(WO4)2, and KY(WO4)2 laser crystals in the 80–300K temperature range
Thermo-optic materials properties of laser host materials have been measured to enable solid-state laser performance modeling. The thermo-optic properties include thermal diffusivity (β), specificExpand
Room-temperature diode-pumped Yb:YAG laser.
TLDR
An efficient room-temperature ytterbium-doped YAG laser operating at 1.03 microm pumped by an InGaAs strained-layer diode laser operating on 968 nm offers a number of advantages over AlGaAs pumped Nd:YAG lasers, including broader absorption features, longer fluorescent lifetime, and lower thermal loading of the gain medium. Expand
Coherent combining of a 4 kW, eight-element fiber amplifier array.
TLDR
Commercial 0.5 kW Yb-doped fiber amplifiers have been characterized and found to be suitable for coherent beam combining and the beam-combining performance is independent of output power. Expand
Effect of radiation trapping on fluorescence lifetime and emission cross section measurements in solid-state laser media.
TLDR
A measurement technique is demonstrated that greatly reduces radiation trapping in Yb:YAG, a prototypical quasi-three-level laser medium, which results in a more-accurate radiative lifetime and a higher stimulated emission cross section. Expand
Optimizing the efficiency and stored energy in quasi-three-level lasers
  • T. Fan
  • Materials Science
  • 1 December 1992
A model is developed for calculating the pumping efficiency of quasi-three-level lasers operated in the energy storage mode. The model is specifically applied to room temperature 1.03- mu m Yb:YAGExpand
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