The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Jens Limpert - One of the best experts on this subject based on the ideXlab platform.
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single Mode propagation with 205µm Mode Field diameter in a passive large pitch fiber
Fiber Lasers XVI: Technology and Systems, 2019Co-Authors: Albrecht Steinkopff, Fabian Stutzki, Cesar Jauregui, Andreas Tunnermann, Johannes Nold, Christian Hupel, Nicoletta Haarlammert, Joerg Bierlich, Jens LimpertAbstract:We present theoretical and experimental investigations on effective single-transverse Mode propagation in very large Mode area (VLMA) fibers. Upscaling the Mode area of fibers is the most effective approach to reduce the nonlinear interaction and, therefore, to allow for the confinement of high-power radiation without detrimental nonlinear effects. Even though the investigations are carried out in a passive large pitch fiber (LPF), they reveal an intrinsic scaling potential of this design which, if unlocked, will be beneficial for active VLMA fibers in the future. A commercial Mode solver based on a full-vectorial finite-difference approach has been used to simulate the confinement losses of the fundamental and higher-order transverse Modes. These simulations have revealed that the differential loss in one-missing-hole photonic crystal fibers can be tailored to be larger than 10 dB/m for fiber core sizes larger than 200 μm at 1 μm wavelength. In order to test the theoretical predictions experimental investigations have been performed. Therefore, a rod-type fiber has been fabricated and effective single-Mode operation with unprecedented large Mode-Field diameters has been demonstrated. We were able to achieve single-Mode propagation in a passive 1.3 m long LPF with a pitch of 140 μm possessing a Mode-Field diameter of 205 μm. Even a strong misalignment of the coupling condition did not lead to any significant appearance of higher order Modes at the fiber exit, which proves the robustness of the singleMode operation. To the best of our knowledge these results represent the largest dimension of a fundamental transverse Mode reported in a waveguide structure at 1 μm wavelength to date. Compared to previous results the Mode area is scaled by a factor of about 4 (with respect to active fibers) and a factor of ~8 (with respect to passive fibers).
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transverse single Mode operation in a passive large pitch fiber with more than 200 μm Mode Field diameter
Optics Letters, 2019Co-Authors: Albrecht Steinkopff, Fabian Stutzki, Cesar Jauregui, Andreas Tunnermann, Johannes Nold, Christian Hupel, Nicoletta Haarlammert, Joerg Bierlich, Jens LimpertAbstract:In this Letter, we present, to the best of our knowledge, the largest effective single-Mode fiber reported to date. The employed waveguide is a passive large pitch fiber (LPF), which shows the core area scaling potential of such a fiber structure. In particular, we achieved stable single-transverse Mode transmission at a wavelength of 1.03 μm through a straight passive LPF with a pitch of 140 μm, resulting in a measured Mode-Field diameter of 205 μm.
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thulium doped fiber chirped pulse amplification system with 2 gw of peak power
Optics Letters, 2016Co-Authors: Christian Gaida, Jens Limpert, Fabian Stutzki, Cesar Jauregui, Martin Gebhardt, Andreas TunnermannAbstract:Thulium-doped fibers with ultra large Mode-Field areas offer new opportunities for the power scaling of mid-IR ultrashort-pulse laser sources. Here, we present a laser system delivering a pulse-peak power of 2 GW and a nearly transform-limited pulse duration of 200 fs in combination with 28.7 W of average power. This performance level has been achieved by optimizing the pulse shape, reducing the overlap with atmospheric absorption lines, and incorporating a climate chamber to reduce the humidity of the atmospheric environment.
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high power very large Mode area thulium doped fiber laser
Optics Letters, 2012Co-Authors: Florian Jansen, Jens Limpert, Fabian Stutzki, Cesar Jauregui, Andreas TunnermannAbstract:Large-pitch photonic-crystal fibers have demonstrated their unique capability of combining very large Mode areas, high output powers and robust single-Mode operation at a wavelength of 1 μm. In this Letter, we present the experimental realization of thulium-doped very large Mode-area fibers based on the large-pitch fibers with record Mode-Field diameters exceeding 60 μm and delivering more than 52 W of output power.
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non hexagonal large pitch fibers for enhanced Mode discrimination
Optics Express, 2011Co-Authors: Fabian Stutzki, Jens Limpert, Florian Jansen, Cesar Jauregui, Andreas TunnermannAbstract:Photonic-Crystal Fibers (PCF) are among the most promising concepts to achieve large Mode Field areas suitable for the reduction of nonlinearities in fibers. Differential Mode propagation loss is the cornerstone of effective single-Mode behavior in passive and core-pumped active PCFs. In this work, we explore non-hexagonal PCF designs with increased Mode discrimination in comparison to the classical hexagonal PCF designs. It is shown that a pentagonal design can increase the Mode discrimination and, simultaneously, also improve the beam quality of Large-Pitch Fibers with Mode Field diameters well beyond 100 µm.
Andreas Tunnermann - One of the best experts on this subject based on the ideXlab platform.
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single Mode propagation with 205µm Mode Field diameter in a passive large pitch fiber
Fiber Lasers XVI: Technology and Systems, 2019Co-Authors: Albrecht Steinkopff, Fabian Stutzki, Cesar Jauregui, Andreas Tunnermann, Johannes Nold, Christian Hupel, Nicoletta Haarlammert, Joerg Bierlich, Jens LimpertAbstract:We present theoretical and experimental investigations on effective single-transverse Mode propagation in very large Mode area (VLMA) fibers. Upscaling the Mode area of fibers is the most effective approach to reduce the nonlinear interaction and, therefore, to allow for the confinement of high-power radiation without detrimental nonlinear effects. Even though the investigations are carried out in a passive large pitch fiber (LPF), they reveal an intrinsic scaling potential of this design which, if unlocked, will be beneficial for active VLMA fibers in the future. A commercial Mode solver based on a full-vectorial finite-difference approach has been used to simulate the confinement losses of the fundamental and higher-order transverse Modes. These simulations have revealed that the differential loss in one-missing-hole photonic crystal fibers can be tailored to be larger than 10 dB/m for fiber core sizes larger than 200 μm at 1 μm wavelength. In order to test the theoretical predictions experimental investigations have been performed. Therefore, a rod-type fiber has been fabricated and effective single-Mode operation with unprecedented large Mode-Field diameters has been demonstrated. We were able to achieve single-Mode propagation in a passive 1.3 m long LPF with a pitch of 140 μm possessing a Mode-Field diameter of 205 μm. Even a strong misalignment of the coupling condition did not lead to any significant appearance of higher order Modes at the fiber exit, which proves the robustness of the singleMode operation. To the best of our knowledge these results represent the largest dimension of a fundamental transverse Mode reported in a waveguide structure at 1 μm wavelength to date. Compared to previous results the Mode area is scaled by a factor of about 4 (with respect to active fibers) and a factor of ~8 (with respect to passive fibers).
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transverse single Mode operation in a passive large pitch fiber with more than 200 μm Mode Field diameter
Optics Letters, 2019Co-Authors: Albrecht Steinkopff, Fabian Stutzki, Cesar Jauregui, Andreas Tunnermann, Johannes Nold, Christian Hupel, Nicoletta Haarlammert, Joerg Bierlich, Jens LimpertAbstract:In this Letter, we present, to the best of our knowledge, the largest effective single-Mode fiber reported to date. The employed waveguide is a passive large pitch fiber (LPF), which shows the core area scaling potential of such a fiber structure. In particular, we achieved stable single-transverse Mode transmission at a wavelength of 1.03 μm through a straight passive LPF with a pitch of 140 μm, resulting in a measured Mode-Field diameter of 205 μm.
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thulium doped fiber chirped pulse amplification system with 2 gw of peak power
Optics Letters, 2016Co-Authors: Christian Gaida, Jens Limpert, Fabian Stutzki, Cesar Jauregui, Martin Gebhardt, Andreas TunnermannAbstract:Thulium-doped fibers with ultra large Mode-Field areas offer new opportunities for the power scaling of mid-IR ultrashort-pulse laser sources. Here, we present a laser system delivering a pulse-peak power of 2 GW and a nearly transform-limited pulse duration of 200 fs in combination with 28.7 W of average power. This performance level has been achieved by optimizing the pulse shape, reducing the overlap with atmospheric absorption lines, and incorporating a climate chamber to reduce the humidity of the atmospheric environment.
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high power very large Mode area thulium doped fiber laser
Optics Letters, 2012Co-Authors: Florian Jansen, Jens Limpert, Fabian Stutzki, Cesar Jauregui, Andreas TunnermannAbstract:Large-pitch photonic-crystal fibers have demonstrated their unique capability of combining very large Mode areas, high output powers and robust single-Mode operation at a wavelength of 1 μm. In this Letter, we present the experimental realization of thulium-doped very large Mode-area fibers based on the large-pitch fibers with record Mode-Field diameters exceeding 60 μm and delivering more than 52 W of output power.
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non hexagonal large pitch fibers for enhanced Mode discrimination
Optics Express, 2011Co-Authors: Fabian Stutzki, Jens Limpert, Florian Jansen, Cesar Jauregui, Andreas TunnermannAbstract:Photonic-Crystal Fibers (PCF) are among the most promising concepts to achieve large Mode Field areas suitable for the reduction of nonlinearities in fibers. Differential Mode propagation loss is the cornerstone of effective single-Mode behavior in passive and core-pumped active PCFs. In this work, we explore non-hexagonal PCF designs with increased Mode discrimination in comparison to the classical hexagonal PCF designs. It is shown that a pentagonal design can increase the Mode discrimination and, simultaneously, also improve the beam quality of Large-Pitch Fibers with Mode Field diameters well beyond 100 µm.
Jes Broeng - One of the best experts on this subject based on the ideXlab platform.
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Stress-induced single-polarization single-transverse Mode photonic crystal fiber with low nonlinearity.
Optics express, 2005Co-Authors: T. Schreiber, A Petersson, Rumen Iliew, Chris Jacobsen, Fabian Röser, K. P. Hansen, K. Hansen, Jens Limpert, Falk Lederer, O. Schmidt, Jes BroengAbstract:We report on the design of a single-polarization single-transverse Mode large Mode area photonic crystal fiber. By including index-matched stress applying elements in the photonic cladding an ultra-broadband single polarization window is obtained while a large Mode Field area of ~700 microm(2) is maintained. Based on that design, an Yb-doped double-clad photonic crystal fiber is realized that combines low nonlinearity and single polarization properties. A first result of the high power operation using this fiber is demonstrated.
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low nonlinearity single transverse Mode ytterbium doped photonic crystal fiber amplifier
Optics Express, 2004Co-Authors: Jens Limpert, A Petersson, Jes Broeng, Andreas Tunnermann, A Liem, M Reich, Thomas Schreiber, Stefan Nolte, H Zellmer, Christian JakobsenAbstract:We report on an air-clad large-core single-transverse-Mode ytterbium-doped photonic crystal fiber with a Mode-Field-diameter of 35 µm, corresponding to a Mode-Field-area of ~1000 µm2. In a first experiment this fiber is used to amplify 10-ps pulses to a peak power of 60 kW without significant spectral broadening due to self-phase modulation allowing for the frequency up-conversion of these pulses using narrow-bandwidth phase-matched nonlinear crystals.
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high power air clad large Mode area photonic crystal fiber laser
Optics Express, 2003Co-Authors: Jens Limpert, Rumen Iliew, Jes Broeng, T. Schreiber, Stefan Nolte, H Zellmer, T Tunnermann, F Lederer, Guillaume Vienne, A PeterssonAbstract:We report on a 2.3 m long air-clad ytterbium-doped large-Mode-area photonic crystal fiber laser generating up to 80 W output power with a slope efficiency of 78%. Single transverse Mode operation is achieved with a Mode-Field area of 350 µm2. No thermo-optical limitations are observed at the extracted ~35W/m, therefore such fibers allow scaling to even higher powers.
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analysis of air guiding photonic bandgap fibers
Optics Letters, 2000Co-Authors: Jes Broeng, Stig Eigil Barkou, Thomas Sondergaard, Araceli BjarklevAbstract:We present what is to our knowledge the first theoretical analysis of air-guiding photonic bandgap fibers. The fibers are characterized by a large hollow core and a microstructured cladding exhibiting photonic bandgap effects. Using an efficient, full-vectorial numerical method, we explain the operational principle of the fibers and obtain detailed information about the properties of the air-guided Modes. This information includes accurate determination of the Modes’ spectral extent, cutoff properties, and Mode-Field distributions.
Fabian Stutzki - One of the best experts on this subject based on the ideXlab platform.
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single Mode propagation with 205µm Mode Field diameter in a passive large pitch fiber
Fiber Lasers XVI: Technology and Systems, 2019Co-Authors: Albrecht Steinkopff, Fabian Stutzki, Cesar Jauregui, Andreas Tunnermann, Johannes Nold, Christian Hupel, Nicoletta Haarlammert, Joerg Bierlich, Jens LimpertAbstract:We present theoretical and experimental investigations on effective single-transverse Mode propagation in very large Mode area (VLMA) fibers. Upscaling the Mode area of fibers is the most effective approach to reduce the nonlinear interaction and, therefore, to allow for the confinement of high-power radiation without detrimental nonlinear effects. Even though the investigations are carried out in a passive large pitch fiber (LPF), they reveal an intrinsic scaling potential of this design which, if unlocked, will be beneficial for active VLMA fibers in the future. A commercial Mode solver based on a full-vectorial finite-difference approach has been used to simulate the confinement losses of the fundamental and higher-order transverse Modes. These simulations have revealed that the differential loss in one-missing-hole photonic crystal fibers can be tailored to be larger than 10 dB/m for fiber core sizes larger than 200 μm at 1 μm wavelength. In order to test the theoretical predictions experimental investigations have been performed. Therefore, a rod-type fiber has been fabricated and effective single-Mode operation with unprecedented large Mode-Field diameters has been demonstrated. We were able to achieve single-Mode propagation in a passive 1.3 m long LPF with a pitch of 140 μm possessing a Mode-Field diameter of 205 μm. Even a strong misalignment of the coupling condition did not lead to any significant appearance of higher order Modes at the fiber exit, which proves the robustness of the singleMode operation. To the best of our knowledge these results represent the largest dimension of a fundamental transverse Mode reported in a waveguide structure at 1 μm wavelength to date. Compared to previous results the Mode area is scaled by a factor of about 4 (with respect to active fibers) and a factor of ~8 (with respect to passive fibers).
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transverse single Mode operation in a passive large pitch fiber with more than 200 μm Mode Field diameter
Optics Letters, 2019Co-Authors: Albrecht Steinkopff, Fabian Stutzki, Cesar Jauregui, Andreas Tunnermann, Johannes Nold, Christian Hupel, Nicoletta Haarlammert, Joerg Bierlich, Jens LimpertAbstract:In this Letter, we present, to the best of our knowledge, the largest effective single-Mode fiber reported to date. The employed waveguide is a passive large pitch fiber (LPF), which shows the core area scaling potential of such a fiber structure. In particular, we achieved stable single-transverse Mode transmission at a wavelength of 1.03 μm through a straight passive LPF with a pitch of 140 μm, resulting in a measured Mode-Field diameter of 205 μm.
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thulium doped fiber chirped pulse amplification system with 2 gw of peak power
Optics Letters, 2016Co-Authors: Christian Gaida, Jens Limpert, Fabian Stutzki, Cesar Jauregui, Martin Gebhardt, Andreas TunnermannAbstract:Thulium-doped fibers with ultra large Mode-Field areas offer new opportunities for the power scaling of mid-IR ultrashort-pulse laser sources. Here, we present a laser system delivering a pulse-peak power of 2 GW and a nearly transform-limited pulse duration of 200 fs in combination with 28.7 W of average power. This performance level has been achieved by optimizing the pulse shape, reducing the overlap with atmospheric absorption lines, and incorporating a climate chamber to reduce the humidity of the atmospheric environment.
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high power very large Mode area thulium doped fiber laser
Optics Letters, 2012Co-Authors: Florian Jansen, Jens Limpert, Fabian Stutzki, Cesar Jauregui, Andreas TunnermannAbstract:Large-pitch photonic-crystal fibers have demonstrated their unique capability of combining very large Mode areas, high output powers and robust single-Mode operation at a wavelength of 1 μm. In this Letter, we present the experimental realization of thulium-doped very large Mode-area fibers based on the large-pitch fibers with record Mode-Field diameters exceeding 60 μm and delivering more than 52 W of output power.
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non hexagonal large pitch fibers for enhanced Mode discrimination
Optics Express, 2011Co-Authors: Fabian Stutzki, Jens Limpert, Florian Jansen, Cesar Jauregui, Andreas TunnermannAbstract:Photonic-Crystal Fibers (PCF) are among the most promising concepts to achieve large Mode Field areas suitable for the reduction of nonlinearities in fibers. Differential Mode propagation loss is the cornerstone of effective single-Mode behavior in passive and core-pumped active PCFs. In this work, we explore non-hexagonal PCF designs with increased Mode discrimination in comparison to the classical hexagonal PCF designs. It is shown that a pentagonal design can increase the Mode discrimination and, simultaneously, also improve the beam quality of Large-Pitch Fibers with Mode Field diameters well beyond 100 µm.
A Petersson - One of the best experts on this subject based on the ideXlab platform.
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Stress-induced single-polarization single-transverse Mode photonic crystal fiber with low nonlinearity.
Optics express, 2005Co-Authors: T. Schreiber, A Petersson, Rumen Iliew, Chris Jacobsen, Fabian Röser, K. P. Hansen, K. Hansen, Jens Limpert, Falk Lederer, O. Schmidt, Jes BroengAbstract:We report on the design of a single-polarization single-transverse Mode large Mode area photonic crystal fiber. By including index-matched stress applying elements in the photonic cladding an ultra-broadband single polarization window is obtained while a large Mode Field area of ~700 microm(2) is maintained. Based on that design, an Yb-doped double-clad photonic crystal fiber is realized that combines low nonlinearity and single polarization properties. A first result of the high power operation using this fiber is demonstrated.
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low nonlinearity single transverse Mode ytterbium doped photonic crystal fiber amplifier
Optics Express, 2004Co-Authors: Jens Limpert, A Petersson, Jes Broeng, Andreas Tunnermann, A Liem, M Reich, Thomas Schreiber, Stefan Nolte, H Zellmer, Christian JakobsenAbstract:We report on an air-clad large-core single-transverse-Mode ytterbium-doped photonic crystal fiber with a Mode-Field-diameter of 35 µm, corresponding to a Mode-Field-area of ~1000 µm2. In a first experiment this fiber is used to amplify 10-ps pulses to a peak power of 60 kW without significant spectral broadening due to self-phase modulation allowing for the frequency up-conversion of these pulses using narrow-bandwidth phase-matched nonlinear crystals.
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high power air clad large Mode area photonic crystal fiber laser
Optics Express, 2003Co-Authors: Jens Limpert, Rumen Iliew, Jes Broeng, T. Schreiber, Stefan Nolte, H Zellmer, T Tunnermann, F Lederer, Guillaume Vienne, A PeterssonAbstract:We report on a 2.3 m long air-clad ytterbium-doped large-Mode-area photonic crystal fiber laser generating up to 80 W output power with a slope efficiency of 78%. Single transverse Mode operation is achieved with a Mode-Field area of 350 µm2. No thermo-optical limitations are observed at the extracted ~35W/m, therefore such fibers allow scaling to even higher powers.
