Robust cladding light stripper for high-power fiber lasers using soft metals

Babazadeh, Amin; Nasirabad, R Rezaei; Norouzey, A; Hejaz, Kamran; Poozesh, Reza; Heidariazar, Amir; Golshan, Ali Hamedani; Roohforouz, Ali; Jafari, Seifollah; Lafouti, Majid

doi:10.1364/ao.53.002611

Cited by 35 publications

(8 citation statements)

References 5 publications

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“…Figure 7b also demonstrates that increasing the length of CLS device to 15.5 cm produces a stripping efficiency of 40% of the cladding light (~2.3 dB). Other coating methods used to form CLSs including the soft-metals coating [5] or the high-index polymer coating [3] utilize a larger contact area either increasing the thickness of the coating or the length of CLSs thus able to strip more unwanted cladding light. Therefore, the performance of the ALD-grown Zirconia-based CLS device can be further enhanced particularly for the high-power applications despite the fact that the CLS device is almost stable and the efficiency changes are less than ±5% when increasing the launched power.…”

Section: Resultsmentioning

confidence: 99%

“…For the higher-index material coatings, mostly polymers in a cascaded arrangement are utilized owing to the ease of the process despite the fact that the polymers have low thermal conductivity and tend to degrade for the long-term operation at high-power applications [3,4]. Soft metals are also shown for the preparation of the CLSs which are robust and have advantages over conventional (degrading) polymers when used in high power applications; nevertheless, the CLS devices coated with certain metals such as Au and Sn suffered localized heating [5]. Furthermore, the higher-index capillary coating is another promising method of the CLSs fabricated by collapsing the borosilicate capillary on the fiber via hydrogen-oxygen torch [6].…”

Section: Introductionmentioning

confidence: 99%

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Atomic layer deposition of zirconium oxide thin film on an optical fiber for cladding light strippers

Karatutlu¹

2020

Turk J Phys

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Cladding light strippers are essential components in high-power fiber lasers used for removal of unwanted cladding light that can distort the beam quality or even damage the whole fiber laser system. In this study, an Atomic Layer Deposition system was used for the first time to prepare the cladding light stripper devices using a 40 nm thick zirconia layer grown on optical fiber. The thickness of the zirconia coating was confirmed using the Scanning Electron Microscopy (SEM) and the Ellipsometry techniques. The elemental analysis was also performed using the wavelength dispersive X-ray spectroscopy technique. The Raman spectroscopy and XRD data confirm the structure of the atomic layer deposition-grown zirconia thin films to be predominantly amorphous. The cladding light stripper devices formed using the zirconia thin films with the lengths of 8.5 and 15.5 cm were able to strip approximately 30% (~1.5 dB) and 40% (~2.3 dB) of the unwanted cladding light.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Atomic layer deposition of zirconium oxide thin film on an optical fiber for cladding light strippers

Karatutlu¹

2020

Turk J Phys

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“…The polymer-free scheme offers another solution to avoid high local temperature. For instance, a unique format of CPS was reported to handle a 150-W power stripping by exploiting soft metal materials [189]. In addition, the CPS without outer polymers was experimentally tested with a 500-W striped power [190].…”

Section: Cladding Power Stripper (Cps)mentioning

confidence: 99%

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

et al. 2022

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The success of high-power fiber lasers is fueled by maturation of active and passive fibers, combined with the availability of high-power fiber-based components. In this contribution, we first overview the enormous potential of rare-earth doped fibers in spectral coverage and recent developments of key fiber-based components employed in high-power laser systems. Subsequently, the emerging functional active and passive fibers in recent years, which exhibit tremendous advantages in balancing or mitigating parasitic nonlinearities hindering high-power transmission, are outlined from the perspectives of geometric and material engineering. Finally, novel functional applications of conventional fiber-based components for nonlinear suppression or spatial mode selection, and correspondingly, the high-power progress of function fiber-based components in power handling are introduced, which suggest more flexible controllability on high-power laser operations. Graphical abstract

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“…Many groups have demonstrated CLSs fabricated by coating and/or etching methods. These include [5] the high-index polymer with 18 dB loss [4], the soft metal coating with 20 dB loss [10], an interesting study on high-power CLS preparation with 20 dB using recoating fiber surface with a capillary glass [8], and chemical etching methods with 27 dB and 16.7 dB loss [1,7,9]. However, no detailed studies on the precise information about the optimum etching conditions and utilizing different chemical etching methods, including chemical stain etching and vapor-phase etching were reported on the performance of CLSs.…”

Section: Introductionmentioning

confidence: 99%

Combined method for the fabrication of high-power cladding light stripper using a buffered oxide etchant

et al. 2019

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Cladding light strippers (CLSs) are vital and one of the critical components for high-power fiber laser applications. In this study, we show the first studies of the formation mechanisms and optimum conditions of a CLS device using a buffered oxide etchant by a combined method of stain (wet) etching and vapor-phase etching. This highpower CLS was shown to result in a stripping performance of ∼17.2 dB at the launched power of 333 W (pump limited). The thermal imaging demonstrates that the maximum temperature reached when operating the device at maximum launched power was ∼75°C. The atomic force microscopy (AFM) results show that the combined method yields crystal-like structures with the height in microscales, whereas other conventional methods give only nanoscale roughness. The method also preserves the diameter of the CLS device close to the bare fiber with about 10 μm tapering leads to a high surface area to strip unwanted light, which is good for heat dissipation. The combined method possesses the outcome of two methods, including both the crystal-like structures and nanosized hillocks, resulting in high-power stripping performance and robustness.

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Robust cladding light stripper for high-power fiber lasers using soft metals

Cited by 35 publications

References 5 publications

Atomic layer deposition of zirconium oxide thin film on an optical fiber for cladding light strippers

Atomic layer deposition of zirconium oxide thin film on an optical fiber for cladding light strippers

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

Combined method for the fabrication of high-power cladding light stripper using a buffered oxide etchant

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