Observation of strong cascaded kerr-lens dynamics in an optimally-coupled ew intracavity frequency-double Nd:YLF ring laser
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Optics Express
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Self-starting self-pulsing dynamics at the cavity free-spectralrange frequency were observed in intracavity second-harmonic generation
of a diode end-pumped Nd:YLF ring laser containing a periodically-poled
KTiOPO4 (ppKTP) nonlinear crystal. Although the unidirectional laser was
designed for continuous-wave (cw) single-frequency operation, with a
resonator set at the middle of its stability range, partial Kerr-lens modelocking (KLM) arose spontaneously once the ppKTP was inserted. This
ultrafast dynamics along with a strong spectral gain broadening, not
observed with any birefringent nonlinear doubler, is associated to the finite
bandwidth of the quasi-phase-matched crystal with respect to the laser gain
bandwidth, leading to giant cascaded Kerr-lensing effects when the ppKTP
temperature is detuned from perfect quasi-phase-matching either in the selffocusing or defocusing sides. While under partial KLM operation the laser
delivered only ~0.14W of broadband red output power, single-frequency
operation could be only achieved by using an intracavity etalon with a
suitable partial reflectivity (R≥25%), leading to an optimally (~100%
efficiency) out-coupled 1.4W red power at 660.5nm, as much as the
fundamental 1321nm power that could be extracted from the unidirectional
laser using an optimal T = 2% output coupler.
Como referenciar
ZONDY, JEAN J.; CAMARGO, FABIOLA A.; ZANON, THOMAS; PETROV, VALENTIN; WETTER, NIKLAUS U. Observation of strong cascaded kerr-lens dynamics in an optimally-coupled ew intracavity frequency-double Nd:YLF ring laser. Optics Express, v. 18, n. 5, p. 4796-4815, 2010. DOI: 10.1364/OE.18.004796. Disponível em: http://repositorio.ipen.br/handle/123456789/8142. Acesso em: 20 Mar 2026.
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