Title :
Generation of intense green light through amplified spontaneous emission in Er3+-doped germanosilicate single-mode optical fiber pumped at 1.319 μm
Author :
Nicácio, D.L. ; Gouveia, E.A. ; Reis, A.M. ; Borges, N M. ; Gouveia-Neto, A.S.
Author_Institution :
Dept. de Fisica, Univ. Federal de Alagoas, Maceio, Brazil
fDate :
11/1/1994 12:00:00 AM
Abstract :
Generation of intense 525 nm green light through amplified spontaneous emission (ASE) in monomode Er3+-doped germanosilicate fiber pumped by a Nd:YAG laser operated at 1.319 μm is reported. The green emission band around 525 nm corresponds to the 2H11/2→2I15/2 transition, and the pumping mechanism is accomplished by a first step resonant two-photon absorption exciting 4F9/2 level and a second one-photon step excited-state absorption (4I9/2) which, with the 2H11/2 state, is populated. The stepwise three-photon frequency upconversion process is enhanced via resonant two- and three-photon transitions connecting ions 4I15/2 ground-state to the 4F9/2 and 4F5/2 excited-states levels, respectively, giving rise to amplified spontaneous emission from the 2H11/2 level to the 4F15/2 ground-state. Efficient third-harmonic generation at 439 nm in short lengths of fiber, in addition to the ASE mechanism, is presented
Keywords :
erbium; excited states; fibre lasers; laser modes; laser transitions; optical harmonic generation; optical pumping; population inversion; superradiance; two-photon processes; 1.319 mum; 439 nm; 525 nm; Er3+-doped germanosilicate single-mode optical fiber; Nd:YAG laser; YAG:Nd; YAl5O12:Nd; amplified spontaneous emission; green emission band; green light; intense green light; monomode Er3+-doped germanosilicate fiber; Absorption; Erbium; Fiber lasers; Frequency; Joining processes; Laser excitation; Laser transitions; Pump lasers; Resonance; Spontaneous emission;
Journal_Title :
Quantum Electronics, IEEE Journal of
