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M T Asom - One of the best experts on this subject based on the ideXlab platform.
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new solid state low loss intracavity Saturable Absorber for nd ylf lasers antiresonant semiconductor fabry ferot
Conference on Lasers and Electro-Optics, 1992Co-Authors: Uwe Keller, G D Boyd, D.a.b. Miller, J.f. Ferguson, T.h. Chiu, M T AsomAbstract:Most solid-state lasers exhibit small gain cross-sections which require low- loss, fast Saturable Absorbers for passive mode-locking. In addition, the Saturable Absorber has to withstand high peak powers. Solid-state Saturable Absorbers are needed for an all-solid-state ultrafast laser technology. Recently, many new passive mode-locking techniques have been introduced which are either based on a real or on an effective fast Saturable Absorber. In the latter, one uses reactive nonlinearities to achieve fast Saturable- Absorberlike mode-locking. They, however, require either a sophisticated active cavity length control or are not self-starting. Fast semiconductor Saturable Absorbers can cover band gaps from the visible to the mid-infrared, but tend to introduce too much loss, have a low saturation intensity, and have problems to withstand the large intracavity peak intensities of solid-state lasers. As a result, they have been previously used inside a low-Q coupled cavity with resonant passive mode-locking (RFM1). RPM is a coupled-cavity mode-locking technique using a real fast semiconductor Saturable Absorber inside a low-Q coupled cavity. Without an active cavity length control, RPM is self-stabilized in the time domain, at the expense however of small optical frequency fluctuations. Here we introduce a new intracavity semiconductor Saturable Absorber formed by a Fabry- Perot structure operated at antiresonance which is fast, low-loss, has a very high effective saturation intensity, requires no cavity length control, and produces stable self-starting cw mode-locked pulses.
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solid state low loss intracavity Saturable Absorber for nd ylf lasers an antiresonant semiconductor fabry perot Saturable Absorber
Optics Letters, 1992Co-Authors: Uwe Keller, G D Boyd, D.a.b. Miller, J.f. Ferguson, T.h. Chiu, M T AsomAbstract:We introduce a new low-loss fast intracavity semiconductor Fabry–Perot Saturable Absorber operated at antiresonance both to start and sustain stable mode locking of a cw-pumped Nd:YLF laser. We achieved a 3.3-ps pulse duration at a 220-MHz repetition rate. The average output power was 700 mW with 2 W of cw pump power from a Ti:sapphire laser. At pump powers of less than 1.6 W the laser self-Q switches and produces 4-ps pulses within a 1.4-μs Q-switched pulse at an ≈150-kHz repetition rate determined by the relaxation oscillation of the Nd:YLF laser. Both modes of operation are stable. In terms of coupled-cavity mode locking, the intracavity antiresonant Fabry–Perot Saturable Absorber corresponds to monolithic resonant passive mode locking.
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solid state low loss intracavity Saturable Absorber for nd ylf lasers an antiresonant semiconductor fabry perot Saturable Absorber
Optics Letters, 1992Co-Authors: Uwe Keller, G D Boyd, D.a.b. Miller, J.f. Ferguson, T.h. Chiu, M T AsomAbstract:We introduce a new low-loss fast intracavity semiconductor Fabry-Perot Saturable Absorber operated at anti-resonance both to start and sustain stable mode locking of a cw-pumped Nd:YLF laser. We achieved a 3.3-ps pulse duration at a 220-MHz repetition rate. The average output power was 700 mW with 2 W of cw pump power from a Ti:sapphire laser. At pump powers of less than 1.6 W the laser self-Q switches and produces 4-ps pulses within a 1.4-micros Q-switched pulse at an approximately 150-kHz repetition rate determined by the relaxation oscillation of the Nd:YLF laser. Both modes of operation are stable. In terms of coupled-cavity mode locking, the intra-cavity antiresonant Fabry-Perot Saturable Absorber corresponds to monolithic resonant passive mode locking.
Uwe Keller - One of the best experts on this subject based on the ideXlab platform.
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diode pumped mode locked nd glass lasers with an antiresonant fabry perot Saturable Absorber
Optics Letters, 1995Co-Authors: Daniel Kopf, Uwe Keller, Franz X. Kärtner, K. J. WeingartenAbstract:We demonstrate passively mode-locked diode-pumped Nd:glass lasers with different media such as silicate, phosphate, and fluorophosphate that are homogeneously or inhomogeneously broadened. An antiresonant Fabry–Perot Saturable Absorber starts and stabilizes the soliton mode-locked Nd:glass lasers, producing pulses as short as 130 fs at an average output power of 100 mW. With a cw Ti:sapphire pump laser we obtain pulses as short as 90 fs.
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new solid state low loss intracavity Saturable Absorber for nd ylf lasers antiresonant semiconductor fabry ferot
Conference on Lasers and Electro-Optics, 1992Co-Authors: Uwe Keller, G D Boyd, D.a.b. Miller, J.f. Ferguson, T.h. Chiu, M T AsomAbstract:Most solid-state lasers exhibit small gain cross-sections which require low- loss, fast Saturable Absorbers for passive mode-locking. In addition, the Saturable Absorber has to withstand high peak powers. Solid-state Saturable Absorbers are needed for an all-solid-state ultrafast laser technology. Recently, many new passive mode-locking techniques have been introduced which are either based on a real or on an effective fast Saturable Absorber. In the latter, one uses reactive nonlinearities to achieve fast Saturable- Absorberlike mode-locking. They, however, require either a sophisticated active cavity length control or are not self-starting. Fast semiconductor Saturable Absorbers can cover band gaps from the visible to the mid-infrared, but tend to introduce too much loss, have a low saturation intensity, and have problems to withstand the large intracavity peak intensities of solid-state lasers. As a result, they have been previously used inside a low-Q coupled cavity with resonant passive mode-locking (RFM1). RPM is a coupled-cavity mode-locking technique using a real fast semiconductor Saturable Absorber inside a low-Q coupled cavity. Without an active cavity length control, RPM is self-stabilized in the time domain, at the expense however of small optical frequency fluctuations. Here we introduce a new intracavity semiconductor Saturable Absorber formed by a Fabry- Perot structure operated at antiresonance which is fast, low-loss, has a very high effective saturation intensity, requires no cavity length control, and produces stable self-starting cw mode-locked pulses.
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solid state low loss intracavity Saturable Absorber for nd ylf lasers an antiresonant semiconductor fabry perot Saturable Absorber
Optics Letters, 1992Co-Authors: Uwe Keller, G D Boyd, D.a.b. Miller, J.f. Ferguson, T.h. Chiu, M T AsomAbstract:We introduce a new low-loss fast intracavity semiconductor Fabry–Perot Saturable Absorber operated at antiresonance both to start and sustain stable mode locking of a cw-pumped Nd:YLF laser. We achieved a 3.3-ps pulse duration at a 220-MHz repetition rate. The average output power was 700 mW with 2 W of cw pump power from a Ti:sapphire laser. At pump powers of less than 1.6 W the laser self-Q switches and produces 4-ps pulses within a 1.4-μs Q-switched pulse at an ≈150-kHz repetition rate determined by the relaxation oscillation of the Nd:YLF laser. Both modes of operation are stable. In terms of coupled-cavity mode locking, the intracavity antiresonant Fabry–Perot Saturable Absorber corresponds to monolithic resonant passive mode locking.
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solid state low loss intracavity Saturable Absorber for nd ylf lasers an antiresonant semiconductor fabry perot Saturable Absorber
Optics Letters, 1992Co-Authors: Uwe Keller, G D Boyd, D.a.b. Miller, J.f. Ferguson, T.h. Chiu, M T AsomAbstract:We introduce a new low-loss fast intracavity semiconductor Fabry-Perot Saturable Absorber operated at anti-resonance both to start and sustain stable mode locking of a cw-pumped Nd:YLF laser. We achieved a 3.3-ps pulse duration at a 220-MHz repetition rate. The average output power was 700 mW with 2 W of cw pump power from a Ti:sapphire laser. At pump powers of less than 1.6 W the laser self-Q switches and produces 4-ps pulses within a 1.4-micros Q-switched pulse at an approximately 150-kHz repetition rate determined by the relaxation oscillation of the Nd:YLF laser. Both modes of operation are stable. In terms of coupled-cavity mode locking, the intra-cavity antiresonant Fabry-Perot Saturable Absorber corresponds to monolithic resonant passive mode locking.
Krzysztof M Abramski - One of the best experts on this subject based on the ideXlab platform.
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passive synchronization of erbium and thulium doped fiber mode locked lasers enhanced by common graphene Saturable Absorber
Optics Express, 2014Co-Authors: Jaroslaw Sotor, Grzegorz Sobon, Iwona Pasternak, Aleksandra Krajewska, Wlodek Strupinski, Jan Tarka, Krzysztof M AbramskiAbstract:In this work we present for the first time, to the best of our knowledge, a passively synchronized thulium (Tm) and erbium (Er) doped fiber laser mode-locked by a common graphene Saturable Absorber (GSA). The laser consists of two ring resonators combined with a 90 cm long common fiber branch incorporating the Saturable Absorber (SA). Such laser generates optical solitons centered at 1558.5 nm and 1938 nm with pulse durations of 915 fs and 1.57 ps, respectively. Both laser loops were passively synchronized at repetition frequency of 20.5025 MHz by nonlinear interaction (cross phase modulation, XPM) in common fiber branch between generated pulses. The maximum cavity mismatch of the Er-laser in synchronization regime was 0.78 mm. The synchronization mechanism was also investigated. We demonstrate that the third order nonlinearities of graphene enhance the synchronization range. In our case the range was increased about 85%. The integrated RMS timing jitter between the synchronized pulses was 67 fs.
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mode locking in er doped fiber laser based on mechanically exfoliated sb_2te_3 Saturable Absorber
Optical Materials Express, 2014Co-Authors: Jaroslaw Sotor, Grzegorz Sobon, W Macherzynski, Piotr Paletko, Kacper Grodecki, Krzysztof M AbramskiAbstract:We demonstrate the usage of a new Saturable Absorber material – antimony telluride (Sb2Te3) for efficient mode-locking of an Erbium-doped fiber laser. The Sb2Te3 layers were obtained by mechanical exfoliation and transferred onto the fiber connector tip. The all-fiber laser was capable of generating optical solitons with the full width at half maximum of 1.8 nm centered at 1558.6 nm, with 4.75 MHz repetition rate. The pulse energy of the generated 1.8 ps pulses was at the level of 105 pJ.
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thulium doped all fiber laser mode locked by cvd graphene pmma Saturable Absorber
Optics Express, 2013Co-Authors: Grzegorz Sobon, Jaroslaw Sotor, Iwona Pasternak, Aleksandra Krajewska, Wlodek Strupinski, Krzysztof M AbramskiAbstract:We report an all-fiber Tm-doped fiber laser mode-locked by graphene Saturable Absorber. The laser emits 1.2 ps pulses at 1884 nm center wavelength with 4 nm of bandwidth and 20.5 MHz mode spacing. The graphene layers were grown on copper foils by chemical vapor deposition (CVD) and transferred onto the fiber connector end. Up to date this is the shortest reported pulse duration achieved from a Tm-doped laser mode-locked by graphene Saturable Absorber. Such cost-effective and stable fiber lasers might be considered as sources for mid-infrared spectroscopy and remote sensing.
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all polarization maintaining femtosecond er doped fiber laser mode locked by graphene Saturable Absorber
Laser Physics Letters, 2012Co-Authors: Grzegorz Sobon, Jaroslaw Sotor, Krzysztof M AbramskiAbstract:All-polarization maintaining, graphene-based passively mode-locked erbium doped fiber laser is presented. The laser consists of fully polarization maintaining (PM) fibers and components, providing linear output polarization state with degree of polarization (DOP) at the level of 93.5%. The Saturable Absorber was formed by mechanical exfoliation of graphene flakes from pure graphite and deposited on a fiber connector. Soliton pulses at 1555 nm were achieved with 45.88 MHz repetition rate with 590 fs duration.
Dongil Yeom - One of the best experts on this subject based on the ideXlab platform.
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ultrafast nonlinear optical properties of thin solid dna film and their application as a Saturable Absorber in femtosecond mode locked fiber laser
Scientific Reports, 2017Co-Authors: Fabian Rotermund, Sahar Hosseinzadeh Kassani, Reza Khazaeinezhad, Hwanseong Jeong, Bjorn Paulson, Jiyoon Gwak, Dongil YeomAbstract:Ultrafast nonlinear optical properties of thin-solid DNA film and their application as a Saturable Absorber in femtosecond mode-locked fiber laser
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all fiber er doped q switched laser based on tungsten disulfide Saturable Absorber
Optical Materials Express, 2015Co-Authors: Sahar Hosseinzadeh Kassani, Reza Khazaeinezhad, Hwanseong Jeong, Tavakol Nazari, Dongil Yeom, Kyunghwan OhAbstract:We demonstrated a Q-switched fiber laser based on Tungsten Disulfide (WS2) Saturable Absorber. The WS2 nano-sheets were prepared by liquid phase exfoliation method and the Saturable Absorber was fabricated by spin-coating of few-layer WS2 nano-sheets on a side-polished fiber for pulsed operation of a fiber laser. By inserting the Absorber into an Erbium-doped fiber laser cavity pumped by a 980 nm laser diode, a stable Q-switched laser operation was achieved with a tunable repetition rates from 82 kHz to 134 kHz depending on the applied pump power. The properties of the deposited WS2 film was examined using scanning electron microscopic (SEM) and atomic force microscope (AFM). Detailed optical properties of the laser output are also discussed.
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efficient mode locking of sub 70 fs ti sapphire laser by graphene Saturable Absorber
Applied Physics Express, 2012Co-Authors: In Hyung Aek, Dongil Yeom, Hwang Woo Lee, Yung Hee Hong, Fabia RotermundAbstract:The efficient passive mode-locking of a Ti:sapphire laser with a monolayer graphene Saturable Absorber is demonstrated for the first time. High-quality and large-area (1 in.) monolayer graphene, synthesized by chemical vapor deposition, exhibits ultrafast recovery times and excellent nonlinear absorption behavior for bulk solid-state laser mode-locking near 800 nm. The continuous-wave mode-locked Ti:sapphire laser generates 63-fs pulses with output powers up to 480 mW under stable operation at 99.4 MHz.
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femtosecond mode locked fiber laser employing a hollow optical fiber filled with carbon nanotube dispersion as Saturable Absorber
Optics Express, 2009Co-Authors: Sun Young Choi, Fabian Rotermund, Kyunghwan Oh, Hojoong Jung, Dongil YeomAbstract:We propose a novel in-line Saturable Absorber incorporating a hollow optical fiber (HOF) filled with single-walled carbon nanotube (SWCNT) dispersion. The evanescent field of the propagating light in the ring core interacts with the SWCNT/polymer composite distributed over the whole length of the HOF. The proposed Saturable Absorber with all-fiber format offers the robust and long nonlinear interaction along the waveguide direction expecting the increase of the threshold for optical and thermal damages with simple fabrication process. Low concentration SWCNT/polymer composite exhibiting very broadband resonant absorption around 1.5 μm with low scattering loss is prepared and based on this, we successfully demonstrate the passively mode-locked fiber laser including the SWCNT-filled HOF where the spectral bandwidth and the pulse duration of the laser output are 5.5 nm and 490 fs, respectively, with a repetition rate of 18.5 MHz.
Jaroslaw Sotor - One of the best experts on this subject based on the ideXlab platform.
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all fiber ho doped mode locked oscillator based on a graphene Saturable Absorber
Optics Letters, 2016Co-Authors: Jaroslaw Sotor, Grzegorz Sobon, Maria Pawliszewska, Iwona Pasternak, Pawel Kaczmarek, Aleksandra Przewolka, Jakub Cajzl, Pavel Peterka, Pavel Honzatko, Ivan KasikAbstract:In this Letter, we demonstrate a graphene mode-locked, all-fiber Ho-doped fiber laser generating 1.3 nJ energy pulses directly from the oscillator. The graphene used as a Saturable Absorber was obtained via chemical vapor deposition on copper substrate and immersed in a poly(methyl methacrylate) support. The laser generated ultrashort soliton pulses at 2080 nm with bandwidth up to 6.1 nm. The influence of the output coupling ratio and the SA modulation depth on the mode-locking performance was also investigated.
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passive synchronization of erbium and thulium doped fiber mode locked lasers enhanced by common graphene Saturable Absorber
Optics Express, 2014Co-Authors: Jaroslaw Sotor, Grzegorz Sobon, Iwona Pasternak, Aleksandra Krajewska, Wlodek Strupinski, Jan Tarka, Krzysztof M AbramskiAbstract:In this work we present for the first time, to the best of our knowledge, a passively synchronized thulium (Tm) and erbium (Er) doped fiber laser mode-locked by a common graphene Saturable Absorber (GSA). The laser consists of two ring resonators combined with a 90 cm long common fiber branch incorporating the Saturable Absorber (SA). Such laser generates optical solitons centered at 1558.5 nm and 1938 nm with pulse durations of 915 fs and 1.57 ps, respectively. Both laser loops were passively synchronized at repetition frequency of 20.5025 MHz by nonlinear interaction (cross phase modulation, XPM) in common fiber branch between generated pulses. The maximum cavity mismatch of the Er-laser in synchronization regime was 0.78 mm. The synchronization mechanism was also investigated. We demonstrate that the third order nonlinearities of graphene enhance the synchronization range. In our case the range was increased about 85%. The integrated RMS timing jitter between the synchronized pulses was 67 fs.
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mode locking in er doped fiber laser based on mechanically exfoliated sb_2te_3 Saturable Absorber
Optical Materials Express, 2014Co-Authors: Jaroslaw Sotor, Grzegorz Sobon, W Macherzynski, Piotr Paletko, Kacper Grodecki, Krzysztof M AbramskiAbstract:We demonstrate the usage of a new Saturable Absorber material – antimony telluride (Sb2Te3) for efficient mode-locking of an Erbium-doped fiber laser. The Sb2Te3 layers were obtained by mechanical exfoliation and transferred onto the fiber connector tip. The all-fiber laser was capable of generating optical solitons with the full width at half maximum of 1.8 nm centered at 1558.6 nm, with 4.75 MHz repetition rate. The pulse energy of the generated 1.8 ps pulses was at the level of 105 pJ.
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thulium doped all fiber laser mode locked by cvd graphene pmma Saturable Absorber
Optics Express, 2013Co-Authors: Grzegorz Sobon, Jaroslaw Sotor, Iwona Pasternak, Aleksandra Krajewska, Wlodek Strupinski, Krzysztof M AbramskiAbstract:We report an all-fiber Tm-doped fiber laser mode-locked by graphene Saturable Absorber. The laser emits 1.2 ps pulses at 1884 nm center wavelength with 4 nm of bandwidth and 20.5 MHz mode spacing. The graphene layers were grown on copper foils by chemical vapor deposition (CVD) and transferred onto the fiber connector end. Up to date this is the shortest reported pulse duration achieved from a Tm-doped laser mode-locked by graphene Saturable Absorber. Such cost-effective and stable fiber lasers might be considered as sources for mid-infrared spectroscopy and remote sensing.
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all polarization maintaining femtosecond er doped fiber laser mode locked by graphene Saturable Absorber
Laser Physics Letters, 2012Co-Authors: Grzegorz Sobon, Jaroslaw Sotor, Krzysztof M AbramskiAbstract:All-polarization maintaining, graphene-based passively mode-locked erbium doped fiber laser is presented. The laser consists of fully polarization maintaining (PM) fibers and components, providing linear output polarization state with degree of polarization (DOP) at the level of 93.5%. The Saturable Absorber was formed by mechanical exfoliation of graphene flakes from pure graphite and deposited on a fiber connector. Soliton pulses at 1555 nm were achieved with 45.88 MHz repetition rate with 590 fs duration.
