Endcapping of high-power 3 µm fiber lasers

Aydın, Yiğit Ozan; Maes, Frédéric; Fortin, Vincent; Bah, Souleymane Toubou; Vallée, Réal; Bernier, Martin

doi:10.1364/oe.27.020659

Cited by 48 publications

(12 citation statements)

References 36 publications

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“…So far, one of the main problems that hinders high-power MIR fiber lasers being put into practical application is the poor long-term stability induced by the optical or thermal damage of the fiber tip and resultant system failure, especially for those based on fluoride fibers [ 26 ] . To investigate the power stability of the germania-fiber-based SC laser, a continuous operation with output power of higher than 30 W for over 1 hour was carried out, as shown in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

Record power and efficient mid-infrared supercontinuum generation in germania fiber with high stability

Yang

Zhang

et al. 2022

High Pow Laser Sci Eng

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We report the demonstration of a mid-infrared (MIR) supercontinuum (SC) laser delivering a record-breaking average output power of more than 40 W with a long wavelength edge up to 3.5 μm. The all-fiberized configuration was composed of a thuliumdoped fiber amplifier system emitting broadband spectrum covering 1.9-2.6 μm with pulse repetition rate of 3 MHz, and a short piece of germania fiber. A 41.9 W MIR SC with a whole spectrum of 1.9 to 3.5 μm was generated in a piece of 0.2-m-long germania fiber, with a power conversion efficiency of 71.4%. For an even shorter germania fiber (0.1 m), an SC with even higher output power of 44.9 W (corresponding to a conversion efficiency of 76.5%) was obtained, but the energy conversion towards long wavelength region was slightly limited. A continuous operation for 1 hour with output power of 32.6 W showed outstanding power stability (RMS 0.17%) of the obtained SC laser. To the best of the

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Section: Resultsmentioning

confidence: 99%

Record power and efficient mid-infrared supercontinuum generation in germania fiber with high stability

Yang

Zhang

et al. 2022

High Pow Laser Sci Eng

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“…During this time frame, no degradation of the laser performance was observed. The fibre amplifier was operated only for short time intervals of 30-60 min to avoid degradation of the fibre facets [17].…”

Section: Resultsmentioning

confidence: 99%

“…emission/absorption cross-sections and rate equations, and numerical simulations of spectral properties should be possible. However, apart from solving the nonlinear rate equations in Er-doped fluoride fibres, numerical models would have to account for other effects that occur in experimental systems and affect the spectral characteristics, such as back-reflections from fibre end-caps [17], self-lasing [13], and potential amplified spontaneous emission (ASE). It is also not possible to simply rely on experimental results, which have been obtained by wavelength-tuning in Er-doped fluoride fibre oscillators [18]- [21].…”

Section: Introductionmentioning

confidence: 99%

Wavelength-Tuning of Nanosecond Pulses in Er-Doped Fluoride Fibre Amplifier

Ray

Yadav

Cozic³

et al. 2022

IEEE Photonics J.

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We investigate the gain bandwidth and wavelengthtuning range of an erbium-doped fluoride fibre amplifier. The presented experimental setup consisted of a widely wavelengthtunable optical parametric oscillator (OPO), which was amplified in a single-stage Er-doped fluoride fibre amplifier. The OPO laser provided seed pulses with a pulse width of 5.2 ns and a repetition rate of 10 kHz. The fibre section consisted of 2.2 m of doubleclad, single-mode fibre with a doping concentration of 7 mol%. Wavelength-tuning was analysed at gain values of up to 26 dB and amplified pulse energies of up to 37.4 µJ. Using this setup, we demonstrate continuous wavelength tuning of more than 100 nm, covering the wavelength range from 2712 nm to 2818 nm.

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“…23 Therefore, for endoscopic applications, one may consider using sapphire fibers or splicing them in other fibers. 24 Doing so may reduce the heat at the endoscope’s tip, thereby also reducing the risk of damaging sensitive material and making it easier to manipulate the fiber.…”

Section: Resultsmentioning

confidence: 99%

Optical fibers for endoscopic high-power Er:YAG laserosteotomy

Bernal

Canbaz

Darwiche³

et al. 2021

J. Biomed. Opt.

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. Significance: The highest absorption peaks of the main components of bone are in the mid-infrared region, making Er:YAG and lasers the most efficient lasers for cutting bone. Yet, studies of deep bone ablation in minimally invasive settings are very limited, as finding suitable materials for coupling high-power laser light with low attenuation beyond is not trivial. Aim: The first aim of this study was to compare the performance of different optical fibers in terms of transmitting Er:YAG laser light with a wavelength at high pulse energy close to 1 J. The second aim was to achieve deep bone ablation using the best-performing fiber, as determined by our experiments. Approach: In our study, various optical fibers with low attenuation ( ) were used to couple the Er:YAG laser. The fibers were made of germanium oxide, sapphire, zirconium fluoride, and hollow-core silica, respectively. We compared the fibers in terms of transmission efficiency, resistance to high Er:YAG laser energy, and bending flexibility. The best-performing fiber was used to achieve deep bone ablation in a minimally invasive setting. To do this, we adapted the optimal settings for free-space deep bone ablation with an Er:YAG laser found in a previous study. Results: Three of the fibers endured energy per pulse as high as 820 mJ at a repetition rate of 10 Hz. The best-performing fiber, made of germanium oxide, provided higher transmission efficiency and greater bending flexibility than the other fibers. With an output energy of 370 mJ per pulse at 10 Hz repetition rate, we reached a cutting depth of in sheep bone. Histology image analysis was performed on the bone tissue adjacent to the laser ablation crater; the images did not show any structural damage. Conclusions: The findings suggest that our prototype could be used in future generations of endoscopic devices for minimally invasive laserosteotomy.

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Endcapping of high-power 3 µm fiber lasers

Cited by 48 publications

References 36 publications

Record power and efficient mid-infrared supercontinuum generation in germania fiber with high stability

Record power and efficient mid-infrared supercontinuum generation in germania fiber with high stability

Wavelength-Tuning of Nanosecond Pulses in Er-Doped Fluoride Fibre Amplifier

Optical fibers for endoscopic high-power Er:YAG laserosteotomy

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