1 mJ pulse bursts from a Yb-doped fiber amplifier

Kalaycıoğlu, Hamit; Eldeniz, Y. Burak; Akçaalan, Önder; Yavaş, Seydi; Gürel, Kutan; Efe, Murat; Ilday, F. Ö.

doi:10.1364/ol.37.002586

Cited by 54 publications

(27 citation statements)

References 17 publications

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“…Recently, we have shown, for the first time, burst-mode operation of a highly integrated fiber amplifier, offering 20 μJ pulses with 0.25 mJ energy within one burst [8]. This was followed by [9], which broke the 1 mJ energy per barrier, with individual pulse energies of 40 μJ. The expected increase in ablation rate has been confirmed with this system [10].…”

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confidence: 53%

“…In addition, variation of the effective gain as experienced by the pulses at the beginning and end of the burst is relatively small. For this reason, we do not need to preshape the individual pulse energies within the burst in order to equate their energies at the end of the amplifier chain [9]. Thus, the high average powers, which make it possible to operate at MHz-level repetition rates with microjoule energies, simplifies the electronics and the pumping scheme substantially over previous demonstrations of burst-mode operation of fiber amplifiers.…”

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confidence: 99%

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Generation of picosecond pulses directly from a 100 W, burst-mode, doping-managed Yb-doped fiber amplifier

et al. 2014

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Burst-mode laser systems offer increased effectiveness in material processing while requiring lower individual pulse energies. Fiber amplifiers operating in this regime generate low powers in the order of 1 W. We present a Yb-doped fiber amplifier, utilizing doping management, that scales the average power up to 100 W. The laser system produces bursts at 1 MHz, where each burst comprises 10 pulses with 10 μJ energy per pulse and is separated in time by 10 ns. The high-burst repetition rate allows substantial simplification of the setup over previous demonstrations of burst-mode operation in fiber lasers. The total energy in each burst is 100 μJ and the average power achieved within the burst is 1 kW. The pulse evolution in the final stage of amplification is initiated as self-similar amplification, which is quickly altered as the pulse spectrum exceeds the gain bandwidth. By prechirping the pulses launched into the amplifier, 17 ps long pulses are generated without using external pulse compression. The peak power of the pulses is ∼0.6 MW.

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Generation of picosecond pulses directly from a 100 W, burst-mode, doping-managed Yb-doped fiber amplifier

et al. 2014

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“…In particular, material processing with ultrafast pulses offers minimal collateral damage and high precision with the main downsides being slow processing speeds relative to alternative technologies and the complexities arising from using high-energy ultrafast laser systems [6]. To counter some of these disadvantages, ultrafast burst-mode fiber lasers that momentarily achieve high repetition rates have been developed, first with high energies [7][8][9] and later with high average powers [10,11]. Access to high repetition rates have allowed the demonstration of ablation-cooled laser material removal [12].…”

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175 fs-long pulses from a high-power single-mode Er-doped fiber laser at 1550 nm

Elahi

Kalaycıoğlu

et al. 2017

Optics Communications

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Development of Er-doped ultrafast lasers have lagged behind the corresponding developments in Yb-and Tmdoped lasers, in particular, fiber lasers. Various applications benefit from operation at a central wavelength of 1.5 m and its second harmonic, including emerging applications such as 3D processing of silicon and 3D printing based on two-photon polymerization. We report a simple, robust fiber master oscillator power amplifier operating at 1.55 m, implementing chirp pulse amplification using single-mode fibers for diffraction-limited beam quality. The laser generates 80 nJ pulses at a repetition rate of 43 MHz, corresponding to an average power of 3.5 W, which can be compressed down to 175 fs. The generation of short pulses was achieved using a design which is guided by numerical simulations of pulse propagation and amplification and manages to overturn gain narrowing with self-phase modulation, without invoking excessive Raman scattering processes. The seed source for the two-stage amplifier is a dispersion-managed passively mode-locked oscillator, which generates a ∼40 nm-wide spectrum and 1.7-ps linearly chirped pulses.

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“…In order to study the laser material interactions at high repetition rates, we previously developed the first generation of burst-mode fiber lasers operating at 1 μm [8], improved the uniformity of pulses with electronic feedback [9], and scaled the burst repetition rates to 1 MHz and 100 W for high-power applications [10]. We further investigated the limits of pulsepumped and continuously pumped burst-mode laser systems by characterizing amplified spontaneous emission (ASE) and achieved 40 μJ pulses in the pulse-pumped and 145 W average power in the continuously pumped systems [11,12].…”

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Burst-mode thulium all-fiber laser delivering femtosecond pulses at a 1 GHz intra-burst repetition rate

et al. 2017

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We report on the development of, to the best of our knowledge, the first ultrafast burst-mode laser system operating at a central wavelength of approximately 2 μm, where water absorption and, consequently, the absorption of most biological tissue is very high. The laser comprises a harmonically mode-locked 1-GHz oscillator, which, in turn, seeds a fiber amplifier chain. The amplifier produces 500 ns long bursts containing 500 pulses with 1 GHz intra-burst and 50 kHz inter-burst repetition rates, respectively, at an average power of 1 W, corresponding to 40 nJ pulse and 20 μJ burst energies, respectively. The entire system is built in an all-fiber architecture and implements dispersion management such that output pulses are delivered directly from a single-mode fiber with a duration of 340 fs without requiring any external compression. This gigahertzrepetition-rate system is intended for ablation-cooled laser material removal in the 2 μm wavelength region, which is interesting for laser surgery due to the exceptionally high tissue absorption at this wavelength. Fiber lasers with all-fiber architecture, guiding light through optical fibers to the point of exit from the laser system, continue to attract attention as practical and robust sources for various applications such as material processing, spectroscopy, and metrology, to name a few. Material processing with ultrafast pulses has superb aspects such as minimal collateral damage and high precision with the downsides being slow process speed and the requirement of complex laser systems [1]. The ablation-cooled laser material regime demonstrated recently [2] opened the door to transcending the limited ablation rates and the need for tens to hundreds of microjoules which have been impairing ultrafast laser material processing for industrial usage. In this regime, the repetition rate has to be high enough so that there is insufficient time for the targeted spot size to cool down substantially by heat conduction into the rest (bulk) of the target material by the time the next pulse arrives. As a result, the individual pulse energy ablation threshold is scaled down by several orders of magnitude if the repetition rate is simultaneously increased, while the thermal effects to the bulk of the target are also reduced. Furthermore, the simultaneous reduction of pulse energy and the pulse-to-pulse spacing reduces the plasma shielding effects. This is a breakthrough which opens the door to the simplification of ultrafast lasers built for material processing and, hence, boosts the usage of ultrafast fiber lasers outside the laboratory and, consequently, the proliferation of such lasers.Among the many applications, laser surgery is a promising area for ultrafast laser ablation because it can enable precise cutting with minimal collateral damage and improved after-operation healing process [3]. One can foresee that, with laser systems operating around 2 μm, the ablation cooling regime will take its effect on water-rich soft tissues since laser-tissue interaction is strongly ...

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1 mJ pulse bursts from a Yb-doped fiber amplifier

Cited by 54 publications

References 17 publications

Generation of picosecond pulses directly from a 100 W, burst-mode, doping-managed Yb-doped fiber amplifier

Generation of picosecond pulses directly from a 100 W, burst-mode, doping-managed Yb-doped fiber amplifier

175 fs-long pulses from a high-power single-mode Er-doped fiber laser at 1550 nm

Burst-mode thulium all-fiber laser delivering femtosecond pulses at a 1 GHz intra-burst repetition rate

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