Optics Letters · 1990 · 50 citations · 9 references
Natural SciencesPhysicsOpticsOptoelectronicsPhotonicsLaser OpticsLaser PhysicsNonlinear OpticsOptical SourcesUltrafast OpticsWaveguidesContinuous-wave LasersLaser AmplificationLaser Gain MaterialsLaser MaterialsLasersPulsed LasersSolid-state Lasers
We report room-temperature operation of what we believe is the first continuous-wave laser that relies exclusively on cooperative upconversion by coupled ion pairs to achieve population inversion.
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L. F. Johnson, H. J. Guggenheim · Applied Physics Letters · 1971 · 314 citations
Natural Sciences, Physics, Optics +16
Upconversion-pumped infrared erbium laser
S. A. Pollack, David B. Chang, N. L. Moise · Journal of Applied Physics · 1986 · 125 citations