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Real Vallee - One of the best experts on this subject based on the ideXlab platform.
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tailoring mid infrared ultrafast light with Fluoride fiber amplifiers conference presentation
Fiber Lasers XVI: Technology and Systems, 2019Co-Authors: Simon Duval, Vincent Fortin, Martin Bernier, Michel Piche, Louisrafael Robichaud, Michel Olivier, Real ValleeAbstract:Novel ultrafast sources based on Fluoride fiber lasers and amplifiers have emerged as a new alternative for the efficient generation of coherent broadband signal in the mid-infrared (> 3 µm). It was shown recently that the amplification of a 2.8-µm ultrafast signal using Er3+: Fluoride fiber leads to different output regimes in the mid-infrared (supercontinuum or tunable femtosecond pulses) depending on the input signal properties. Here, we study the underlying mechanisms that affect the amplification and spectral conversion dynamics of ultrashort pulses inside such amplifier through a complete numerical model based on accurate measurements of the amplifier properties. The numerical results, which are in very good agreement with the experiment, show an enhanced output stability due to the attractor properties of the amplifier and the possibility of generating a supercontinuum extending from 2.8 to 4.2 µm with more than 4 W of average power using off-the-shelf fluorozirconate fibers. By designing the appropriate amplifier, tunable and spectrally isolated femtosecond solitons with peak power up to 400 kW around 3.4 µm that can be shifted up to 4 µm could also be achieved. Future perspectives with novel mid-IR laser transitions and different Fluoride Glass compositions with extended transmission are also discussed.
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watt level fiber based femtosecond laser source tunable from 2 8 to 3 6 μm
Optics Letters, 2016Co-Authors: Simon Duval, Vincent Fortin, Martin Bernier, Michel Piche, Jeanchristophe Gauthier, Louisrafael Robichaud, Pascal Paradis, Michel Olivier, Real ValleeAbstract:The development of compact and reliable ultrafast sources operating in the mid-infrared region could lead to major advances in both fundamental and applied sciences. In this Letter, we report on a simple and efficient laser system based entirely on erbium-doped Fluoride Glass fibers that generates high-energy Raman soliton pulses tunable from 2.8 to 3.6 μm at a high average output power. Stable 160 fs pulses at 3.4 μm with a maximum energy of 37 nJ, a corresponding average output power above 2 W, and an estimated peak power above 200 kW are demonstrated. This tunable source promises direct applications in laser processing of polymers and biological materials.
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femtosecond fiber lasers reach the mid infrared
Optica, 2015Co-Authors: Simon Duval, Vincent Fortin, Martin Bernier, Jerome Genest, Michel Piche, Real ValleeAbstract:Ultrafast fiber lasers operating in the near-infrared have revolutionized laser science by enabling numerous breakthroughs in both fundamental science and industrial applications. In this Letter, we extend the spectral coverage of these laser sources to the mid-infrared by reporting the first femtosecond fiber laser operating near 3 μm. This passively mode-locked fiber ring laser based on nonlinear polarization evolution in an Er3+-doped Fluoride Glass fiber generates 207 fs pulses at 2.8 μm with an estimated peak power of 3.5 kW. This demonstration paves the way for further developments of promising applications in the molecular fingerprint region such as frequency comb spectroscopy.
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30 w Fluoride Glass all fiber laser at 2 94 μm
Optics Letters, 2015Co-Authors: Vincent Fortin, Martin Bernier, Real ValleeAbstract:We report the demonstration of a 2938 nm erbium-doped Fluoride Glass fiber laser delivering a record output power of 30.5 W in continuous wave operation. The passively cooled all-fiber laser cavity based on intracore fiber Bragg gratings has an overall laser efficiency of 16% as a function of the launched pump power at 980 nm and a single-mode output beam quality of M2<1.2. This power scaling demonstration of a fiber laser operating near the vibrational resonance of water is likely to have a significant impact on several biomedical applications.
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3 77 μm fiber laser based on cascaded raman gain in a chalcogenide Glass fiber
Optics Letters, 2014Co-Authors: Martin Bernier, Vincent Fortin, Mohammed Elamraoui, Younes Messaddeq, Real ValleeAbstract:Laser emission is demonstrated at a wavelength of 3.766 μm in a cascaded Raman gain device. The laser cavity is made of two nested pairs of fiber Bragg gratings inscribed in a 2.8 m length of low-loss As2S3 fiber. An erbium-doped Fluoride Glass quasi-CW fiber laser emitting at 3.005 μm is used to pump the cascaded Raman cavity, which converts the pump wavelength successively to the first and second Stokes orders, respectively at 3.340 and 3.766 μm. A laser output peak power in excess of 100 mW is obtained with a lasing efficiency of about 8.3% with respect to the launched pump power. This represents the highest emission wavelength delivered by a fiber laser operating at room temperature.
Pengfei Wang - One of the best experts on this subject based on the ideXlab platform.
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a tm3 doped zrf4 baf2 yf3 alf3 Glass microsphere laser in the 2 0 μm wavelength region
Journal of Luminescence, 2019Co-Authors: Haiyan Zhao, Angzhen Li, Yating Yi, Masaki Tokurakawa, Shunbin Wang, Gilberto Brambilla, Pengfei WangAbstract:Abstract This work reports a microsphere laser at ∼2.0 μm in a Tm3+-doped ZrF4-BaF2-YF3-AlF3 (ZBYA) Fluoride Glass. The ZBYA Glass microsphere was fabricated by reflowing the tip of a 1.0 mol% Tm3+-doped ZBYA Glass fiber with a CO2 laser. By using a fiber taper for input and output coupling in the Tm3+-doped ZBYA microsphere, single and multi-mode laser outputs at around 2.0 μm were observed under 808 nm laser excitation. The radiation lifetime and emission cross-section of Tm3+ ions in ZBYA Glass were calculated to be 6.42 ms and 5.86 × 10−21 cm2, respectively. Our results indicate that the Tm3+-doped ZBYA Fluoride Glass has potential applications for 2.0 μm lasers.
Martin Bernier - One of the best experts on this subject based on the ideXlab platform.
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tailoring mid infrared ultrafast light with Fluoride fiber amplifiers conference presentation
Fiber Lasers XVI: Technology and Systems, 2019Co-Authors: Simon Duval, Vincent Fortin, Martin Bernier, Michel Piche, Louisrafael Robichaud, Michel Olivier, Real ValleeAbstract:Novel ultrafast sources based on Fluoride fiber lasers and amplifiers have emerged as a new alternative for the efficient generation of coherent broadband signal in the mid-infrared (> 3 µm). It was shown recently that the amplification of a 2.8-µm ultrafast signal using Er3+: Fluoride fiber leads to different output regimes in the mid-infrared (supercontinuum or tunable femtosecond pulses) depending on the input signal properties. Here, we study the underlying mechanisms that affect the amplification and spectral conversion dynamics of ultrashort pulses inside such amplifier through a complete numerical model based on accurate measurements of the amplifier properties. The numerical results, which are in very good agreement with the experiment, show an enhanced output stability due to the attractor properties of the amplifier and the possibility of generating a supercontinuum extending from 2.8 to 4.2 µm with more than 4 W of average power using off-the-shelf fluorozirconate fibers. By designing the appropriate amplifier, tunable and spectrally isolated femtosecond solitons with peak power up to 400 kW around 3.4 µm that can be shifted up to 4 µm could also be achieved. Future perspectives with novel mid-IR laser transitions and different Fluoride Glass compositions with extended transmission are also discussed.
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watt level fiber based femtosecond laser source tunable from 2 8 to 3 6 μm
Optics Letters, 2016Co-Authors: Simon Duval, Vincent Fortin, Martin Bernier, Michel Piche, Jeanchristophe Gauthier, Louisrafael Robichaud, Pascal Paradis, Michel Olivier, Real ValleeAbstract:The development of compact and reliable ultrafast sources operating in the mid-infrared region could lead to major advances in both fundamental and applied sciences. In this Letter, we report on a simple and efficient laser system based entirely on erbium-doped Fluoride Glass fibers that generates high-energy Raman soliton pulses tunable from 2.8 to 3.6 μm at a high average output power. Stable 160 fs pulses at 3.4 μm with a maximum energy of 37 nJ, a corresponding average output power above 2 W, and an estimated peak power above 200 kW are demonstrated. This tunable source promises direct applications in laser processing of polymers and biological materials.
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femtosecond fiber lasers reach the mid infrared
Optica, 2015Co-Authors: Simon Duval, Vincent Fortin, Martin Bernier, Jerome Genest, Michel Piche, Real ValleeAbstract:Ultrafast fiber lasers operating in the near-infrared have revolutionized laser science by enabling numerous breakthroughs in both fundamental science and industrial applications. In this Letter, we extend the spectral coverage of these laser sources to the mid-infrared by reporting the first femtosecond fiber laser operating near 3 μm. This passively mode-locked fiber ring laser based on nonlinear polarization evolution in an Er3+-doped Fluoride Glass fiber generates 207 fs pulses at 2.8 μm with an estimated peak power of 3.5 kW. This demonstration paves the way for further developments of promising applications in the molecular fingerprint region such as frequency comb spectroscopy.
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30 w Fluoride Glass all fiber laser at 2 94 μm
Optics Letters, 2015Co-Authors: Vincent Fortin, Martin Bernier, Real ValleeAbstract:We report the demonstration of a 2938 nm erbium-doped Fluoride Glass fiber laser delivering a record output power of 30.5 W in continuous wave operation. The passively cooled all-fiber laser cavity based on intracore fiber Bragg gratings has an overall laser efficiency of 16% as a function of the launched pump power at 980 nm and a single-mode output beam quality of M2<1.2. This power scaling demonstration of a fiber laser operating near the vibrational resonance of water is likely to have a significant impact on several biomedical applications.
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3 77 μm fiber laser based on cascaded raman gain in a chalcogenide Glass fiber
Optics Letters, 2014Co-Authors: Martin Bernier, Vincent Fortin, Mohammed Elamraoui, Younes Messaddeq, Real ValleeAbstract:Laser emission is demonstrated at a wavelength of 3.766 μm in a cascaded Raman gain device. The laser cavity is made of two nested pairs of fiber Bragg gratings inscribed in a 2.8 m length of low-loss As2S3 fiber. An erbium-doped Fluoride Glass quasi-CW fiber laser emitting at 3.005 μm is used to pump the cascaded Raman cavity, which converts the pump wavelength successively to the first and second Stokes orders, respectively at 3.340 and 3.766 μm. A laser output peak power in excess of 100 mW is obtained with a lasing efficiency of about 8.3% with respect to the launched pump power. This represents the highest emission wavelength delivered by a fiber laser operating at room temperature.
Junjie Zhang - One of the best experts on this subject based on the ideXlab platform.
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highly er 3 doped zrf4 based Fluoride Glasses for 2 7 μm laser materials
Applied Optics, 2013Co-Authors: Feifei Huang, Liyan Zhang, Yanyan Guo, Junjie ZhangAbstract:A new type of Fluoride Glasses with high erbium-doping concentration (up to 6 mol. % Er(3+)) is investigated. The intensive 2.7 μm fluorescence is demonstrated with minimized concentration quenching. The intensity parameters and radiative properties are determined from the absorption spectrum based on the Judd-Ofelt theory. The prepared Er(3+)-doped ZBYA Glass possesses high predicted spontaneous-transition probability (28.92 s(-1)) and large calculated emission cross section (9.8×10(-21) cm(2)). All these results indicate that this Er(3+)-doped ZrF(4)-based Fluoride Glass has potential applications in 2.7 μm laser materials.
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2 7 μm fluorescence radiative dynamics and energy transfer between er3 and tm3 ions in Fluoride Glass under 800 nm and 980 nm excitation
Journal of Quantitative Spectroscopy & Radiative Transfer, 2012Co-Authors: Ying Tian, Junjie ZhangAbstract:Abstract A detailed study of the fluorescence radiative dynamics and energy transfer processes between Er and Tm ions in the Er 3+ /Tm 3+ doped Fluoride Glass is reported. The fluorescence properties of 2.7 μm emission, other infrared and visible emissions are investigated under different selective laser excitations. Three Judd–Ofelt intensity parameters, energy transfer microparameters and efficiency have been determined and discussed. It is found that present Er 3+ /Tm 3+ doped Fluoride Glass possesses large calculated emission cross section (8.98×10 –21 cm 2 ) around 2.7 μm. The more suitable pumping scheme for laser applications at 2.7 μm laser is 980 nm excitation for Er 3+ /Tm 3+ doped Fluoride Glass.
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spectroscopic properties and energy transfer process in er3 doped zrf4 based Fluoride Glass for 2 7μm laser materials
Optical Materials, 2011Co-Authors: Ying Tian, Junjie ZhangAbstract:Abstract Intense 2.7 μm emission from Er 3+ doped in a new type of ZrF 4 -based Fluoride Glass is reported. 2.7 μm emission characteristics and energy transfer process upon excitation of a conventional 980 nm laser diode are investigated. Based on the absorption spectra, the Judd–Ofelt parameters and radiative properties were calculated and compared with those of other Glass hosts. The prepared Glass possesses higher predicted spontaneous transition probability (29.04 s −1 ) along with larger calculated emission cross section (9.16 × 10 −21 cm 2 ). Besides, the energy transfer coefficient of laser upper level ( 4 I 11/2 ) can reach as high as 6.56 × 10 −39 cm 6 /s. Hence, these results indicate that this Er 3+ doped ZrF 4 -based Fluoride Glass has potential applications in 2.7 μm laser.
Naohiro Soga - One of the best experts on this subject based on the ideXlab platform.
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upconversion properties multiphonon relaxation and local environment of rare earth ions in fluorophosphate Glasses
Physical Review B, 1992Co-Authors: Setsuhisa Tanabe, Shigeo Yoshii, Kazuyuki Hirao, Naohiro SogaAbstract:The upconversion properties of Er{sup 3+} ions were studied for the fluorophosphate Glasses (45{minus}{ital x})AlF{sub 3}{center dot}{ital x}AlPO{sub 4}{center dot}5ErF{sub 3}{center dot}30CaF{sub 2}{center dot}20BaF{sub 2}, with use of the infrared radiation from a (Ga,Al)As laser diode ({lambda}=802 nm) as an excitation source. Green upconversion fluorescence due to the {sup 4}{ital S}{sub 3/2}{r arrow}{sup 4}{ital I}{sub 15/2} transition could be observed for the Fluoride Glass, while the fluorescence intensity for fluorophosphate Glasses decreased drastically with increasing AlPO{sub 4} content. It was found from the phonon sideband spectra of Eu{sup 3+} that the phonon with {h bar}{omega}=1060 cm{sup {minus}1}, corresponding to P-O{sup {minus}} stretching vibrations, became coupled to the multiphonon relaxation of rare-earth ions, and its electron-phonon coupling strength increased greatly with increasing phosphate content. The temperature dependence of upconversion intensity was large for the Fluoride system, while it was small for the fluorophosphate system. These tendencies could be well explained by considering the multiphonon decay rate of the Er{sup 3+} intermediate level and its temperature dependence, which are functions of the phonon energy of the host and the energy gap to the next-lower level of Er{sup 3+}. Combined with the results of {sup 151}Eu Moessbauer spectroscopy, it was concluded that themore » upconversion properties in these Glasses were largely influenced by the local structure and the phonon mode coupled to the rare-earth ions.« less
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upconversion properties multiphonon relaxation and local environment of rare earth ions in fluorophosphate Glasses
Physical Review B, 1992Co-Authors: Setsuhisa Tanabe, Shigeo Yoshii, Kazuyuki Hirao, Naohiro SogaAbstract:The upconversion properties of ${\mathrm{Er}}^{3+}$ ions were studied for the fluorophosphate Glasses (45-x)${\mathrm{AlF}}_{3}$\ensuremath{\cdot}x${\mathrm{AlPO}}_{4}$\ensuremath{\cdot}${5\mathrm{E}\mathrm{r}\mathrm{F}}_{3}$\ensuremath{\cdot}${30\mathrm{C}\mathrm{a}\mathrm{F}}_{2}$\ensuremath{\cdot}${20\mathrm{B}\mathrm{a}\mathrm{F}}_{2}$, with use of the infrared radiation from a (Ga,Al)As laser diode (\ensuremath{\lambda}=802 nm) as an excitation source. Green upconversion fluorescence due to the $^{4}$${\mathit{S}}_{3/2}$${\ensuremath{\rightarrow}}^{4}$${\mathit{I}}_{15/2}$ transition could be observed for the Fluoride Glass, while the fluorescence intensity for fluorophosphate Glasses decreased drastically with increasing ${\mathrm{AlPO}}_{4}$ content. It was found from the phonon sideband spectra of ${\mathrm{Eu}}^{3+}$ that the phonon with \ensuremath{\Elzxh}\ensuremath{\omega}=1060 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$, corresponding to P-${\mathrm{O}}^{\mathrm{\ensuremath{-}}}$ stretching vibrations, became coupled to the multiphonon relaxation of rare-earth ions, and its electron-phonon coupling strength increased greatly with increasing phosphate content. The temperature dependence of upconversion intensity was large for the Fluoride system, while it was small for the fluorophosphate system. These tendencies could be well explained by considering the multiphonon decay rate of the ${\mathrm{Er}}^{3+}$ intermediate level and its temperature dependence, which are functions of the phonon energy of the host and the energy gap to the next-lower level of ${\mathrm{Er}}^{3+}$. Combined with the results of $^{151}\mathrm{Eu}$ M\"ossbauer spectroscopy, it was concluded that the upconversion properties in these Glasses were largely influenced by the local structure and the phonon mode coupled to the rare-earth ions.