Phase-matching of the HE11and HE13modes of highly doped GeO2–SiO2fiber waveguides at 1596 nm and 532 nm, respectively, for triple-photon generation

Tsvetkov, S. V.; Katamadze, K. G.; Borshchevskaia, N. A.; Sysolyatin, A. A.; Федоров, М. В.; Kulik, S. P.; Salganskii, M.Y.; Belanov, A S

doi:10.1088/1612-2011/13/2/025104

Cited by 8 publications

(1 citation statement)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We studied germania-silica fibers highly doped with GeO 2 (31 mol.% GeO 2 ), the same as in [32]. They absorb in UV and visible region with maximum at 400-500 nm (Fig.…”

Section: Methodsmentioning

confidence: 99%

Luminescence in germania–silica fibers in a 1–2 μm region

et al. 2017

View full text Add to dashboard Cite

We analyze the origins of the luminescence in germania-silica fibers with high germanium concentration (about 30 mol.% GeO2) in the region 1-2 µm with a laser pump at the wavelength 532 nm. We show that such fibers demonstrate the high level of luminescence which unlikely allows the observation of photon triplets, generated in a third-order spontaneous parametric down-conversion process in such fibers. The only efficient approach to the luminescence reduction is the hydrogen saturation of fiber samples, however, even in this case the level of residual luminescence is still too high for three-photon registration.

show abstract

“…We studied germania-silica fibers highly doped with GeO 2 (31 mol.% GeO 2 ), the same as in [32]. They absorb in UV and visible region with maximum at 400-500 nm (Fig.…”

Section: Methodsmentioning

confidence: 99%

Luminescence in germania–silica fibers in a 1–2 μm region

et al. 2017

View full text Add to dashboard Cite

show abstract

Intermodal effective phase matching for second harmonic generation of ultrashort pulses in high index contrast optical fibers

Tishchenko,

Berghmans,

Baghdasaryan

2024

Applied Physics Letters

View full text Add to dashboard Cite

Second harmonic generation (SHG) in glass optical fibers calls for creating a second order susceptibility in the fiber glass and for achieving phase matching between the pump and the second harmonic signal. The latter is very challenging when using ultrashort pulses, given that the group velocities of the pump and the second harmonic should also be matched. We have shown in previous work that it is possible to achieve simultaneous modal phase matching (MPM) and group velocity matching (GVM) when the pump and the second harmonic are propagating in the LP01 and LP02 modes, respectively, in high GeO2-content double-clad optical fibers. However, simultaneous MPM and GVM can only be obtained in optical fibers with dedicated designs and within very tight geometrical tolerances. In this paper, we show that instead of considering the matching of phase and group velocities separately, we can consider a more general or “effective” phase matching approach, in which we consider all the dispersion terms up to the second order in the expressions of the propagation constants of the pump and second harmonic signals. This allows introducing the pulse duration as a controllable parameter that helps to enforce the said effective phase matching in fibers with designs that deviate by as much as 10% from the target, while providing for temporal walk-off lengths in excess of several centimeters. The impact of this finding goes beyond SHG only and can be applied to other ultrashort laser pulse-based nonlinear optical processes in fibers and waveguides.

show abstract