Saint-Louis-de-Montferrand, France
Saint-Louis-de-Montferrand, France
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Taccheo S.,University of Swansea | Gebavi H.,University of Swansea | Monteville A.,PERFOS | Le Goffic O.,PERFOS | And 7 more authors.
Optics Express | Year: 2011

We report on an extensive investigation of photodarkening in Yb-doped silica fibers. A set of similar fibers, covering a large Yb concentration range, was made so as to compare the photodarkening induced losses. Careful measurements were made to ensure equal and uniform inversion for all the tested fibers. The results show that, with the specific set-up, the stretching parameter obtained through fitting has a very limited variation. This gives more meaning to the fitting parameters. Results tend to indicate a square law dependence of the concentration of excited ions on the final saturated loss. We also demonstrate self-similarity of loss evolution when experimental curves are simply normalized to fitting parameters. This evidence of self-similarity also supports the possibility of introducing a preliminary figure of merit for Yb-doped fiber. This will allow the impact of photodarkening on laser/amplifier devices to be evaluated. © 2011 Optical Society of America.

Gebavi H.,University of Swansea | Taccheo S.,University of Swansea | Milanese D.,Polytechnic University of Turin | Monteville A.,Perfos | And 6 more authors.
Optics Express | Year: 2011

The present work describes photodarkening from the viewpoint of cooperative luminescence. The temporal evolution of both effects was measured simultaneously by means of ytterbium doped aluminosilicate fibers for concentrations up to 1.8 wt% Yb3+. The quadratic dependence of photodarkening and cooperative luminescence versus dopant concentration was observed. The change in the photodarkening and cooperative luminescence mutual dynamics for highly and low doped fibers is ascribed to a different ion number which forms the cluster. Cooperative luminescence is proved to be a natural probe for photodarkening since it provides new pieces of information and contributes to the photodarkening mechanism description. © 2011 Optical Society of America.

Coulombier Q.,CNRS Chemistry Institute of Rennes | Brilland L.,PERFOS | Houizot P.,CNRS Chemistry Institute of Rennes | Chartier T.,ENSSAT | And 9 more authors.
Optics Express | Year: 2010

We report significant advances in the fabrication of low loss chalcogenide microstructured optical fiber (MOF). This new method, consisting in molding the glass in a silica cast made of capillaries and capillary guides, allows the development of various designs of fibers, such as suspended core, large core or small core MOFs. After removing the cast in a hydrofluoric acid bath, the preform is drawn and the design is controlled using a system applying differential pressure in the holes. Fiber losses, which are the lowest recorded so far for selenium based MOFs, are equal to the material losses, meaning that the process has no effect on the glass quality. ©2010 Optical Society of America.

Provo R.,University of Auckland | Murdoch S.,University of Auckland | Harvey J.D.,University of Auckland | Mechin D.,PERFOS
Optics Letters | Year: 2010

The phase-matching curves for the four-wave mixing effect of Bragg scattering in two fibers with opposite sign β4 dispersion coefficients have been measured experimentally. The measured phase-matching curves are in good agreement with theoretical expectations, and their dependence on several key parameters has been determined. © 2010 Optical Society of America.

Moller U.,Technical University of Denmark | Yu Y.,Australian National University | Kubat I.,Technical University of Denmark | Petersen C.R.,Technical University of Denmark | And 7 more authors.
Optics Express | Year: 2015

A low-loss suspended core As38Se62fiber with core diameter of 4.5 μm and a zero-dispersion wavelength of 3.5 μm was used for mid-infrared supercontinuum generation. The dispersion of the fiber was measured from 2.9 to 4.2 μm and was in good correspondence with the calculated dispersion. An optical parametric amplifier delivering 320 fs pulses with a peak power of 14.8 kW at a repetition rate of 21 MHz was used to pump 18 cm of suspended core fiber at different wavelengths from 3.3 to 4.7 μm. By pumping at 4.4 μm with a peak power of 5.2 kW coupled to the fiber a supercontinuum spanning from 1.7 to 7.5 μm with an average output power of 15.6 mW and an average power >5.0μm of 4.7 mW was obtained. © 2015 Optical Society of America.

Kubat I.,Technical University of Denmark | Petersen C.R.,Technical University of Denmark | Moller U.V.,Technical University of Denmark | Seddon A.,University of Nottingham | And 5 more authors.
Optics Express | Year: 2014

We theoretically demonstrate a novel approach for generating Mid-InfraRed SuperContinuum (MIR SC) by using concatenated fluoride and chalcogenide glass fibers pumped with a standard pulsed Thulium (Tm) laser (TFWHM=3.5ps, P0=20kW, ΝR=30MHz, and Pavg=2W). The fluoride fiber SC is generated in 10m of ZBLAN spanning the 0.9-4.1μm SC at the -30dB level. The ZBLAN fiber SC is then coupled into 10cm of As 2Se3 chalcogenide Microstructured Optical Fiber (MOF) designed to have a zero-dispersion wavelength (λZDW) significantly below the 4.1μm InfraRed (IR) edge of the ZBLAN fiber SC, here 3.55μm. This allows the MIR solitons in the ZBLAN fiber SC to couple into anomalous dispersion in the chalcogenide fiber and further redshift out to the fiber loss edge at around 9μm. The final 0.9-9μm SC covers over 3 octaves in the MIR with around 15mW of power converted into the 6-9μm range. © 2014 Optical Society of America.

Gebavi H.,University of Swansea | Taccheo S.,University of Swansea | Tregoat D.,Perfos | Monteville A.,Perfos | Robin T.,IXFiber S.A.S.
Optical Materials Express | Year: 2012

In the present study, we examined photodarkening loss reduction in Yb3+ doped aluminosilicate fibers by utilizing 633 nm light irradiation. It is demonstrated that the final photobleaching value is intensity dependent, but the percentage of photodarkening reduction does not depend on dopant concentrations for settled bleaching intensity. Further examination was committed to explore the photobleaching starting from different photodarkening loss levels while keeping the same dopant concentration and subsequently the other way around. This approach related photobleaching with the number of photodarkening induced color centers and also showed that photobleaching was dopant concentration dependent. In all experiments an unbleachable residual loss for the bleaching powers up to ~100 W/mm2 was found. To the best of our knowledge this is the most extensive investigation of photobleaching effect. © 2012 Optical Society of America.

Toupin P.,CNRS Chemistry Institute of Rennes | Brilland L.,PERFOS | Troles J.,CNRS Chemistry Institute of Rennes | Adam J.-L.,CNRS Chemistry Institute of Rennes
Optical Materials Express | Year: 2012

Effects of multiple drawing operations on As38Se62 and Ge10As22Se68 chalcogenide microstructured optical fibers (MOF) are investigated. Fabrication of small-core single-mode chalcogenide MOF's with 3 rings of holes necessitates a two-step drawing operation which may conduct to additional optical losses, as compared to single-step processes. Thus, glasses with high stability against crystallization are required. With this respect, Ge10As22Se68 single-mode microstructured optical were obtained with optical losses equal to 1 dB/m at 1.55 μm and lower than 1 dB/m at 3.0μm. Core diameter is as small as 4-6 μm. © 2012 Optical Society of America.

Gebavi H.,University of Swansea | Taccheo S.,University of Swansea | Lablonde L.,IXFiber S. A. S. | Cadier B.,IXFiber S. A. S. | And 3 more authors.
Optics Letters | Year: 2013

In this work, the influence of photodarkening (PD) and photobleaching (PB) on the lasing features of the ytterbiumdoped aluminosilicate fiber lasers is examined. Simultaneous PD and PB with 633 nm irradiation was monitored at the lasing wavelength of 1070 nm and compared with individually caused PD and PB effects. The variation of laser threshold and slope efficiency was reported. By analyzing the laser performances it was found that the ratio of excess loss at 633 and 1070 nm is expected to be less than 20. In addition, considerable mitigation of the PD with 633 nm light irradiation is demonstrated. © 2013 Optical Society of America.

Piccoli R.,University of Swansea | Mechin D.,Perfos | Robin T.,IXFiber S.A.S. | Taccheo S.,University of Swansea
Optics Letters | Year: 2013

In this Letter, the lifetime temporal reduction in ytterbium-doped aluminosilicate fibers due to pump-induced photodarkening (PD) has been reported. A linear correlation between lifetime reduction at equilibrium state and equilibrium losses due to the PD phenomenon was demonstrated. A squared-law dependence between lifetime reduction and dopant concentration (percent by weight) suggests a possible correction term for the rate equations system which allows improving its accuracy. Finally, a quenching effect was also observed for different pump power levels in order to find the corresponding lifetime value for different inversion levels. The quantitative analysis allows determination of the PD quenching term in the laser rate equations system to properly model a laser device that may be affected by this process. © 2013 Optical Society of America.

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