Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power

Jeong, Yoonchan; Sahu, J.K.; Payne, D.N.; Nilsson, Johan

doi:10.1364/opex.12.006088

Cited by 836 publications

(352 citation statements)

References 8 publications

(12 reference statements)

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“…As in our system, with a V value of 3.53, the fiber can only support four modes at most. By coiling the fiber onto a 20 cm-diameter aluminum spool, higher modes in the fiber are suppressed [21]. With two multimode FBGs, the lasing modes in the multimode fiber get double selected.…”

Section: Resultsmentioning

confidence: 99%

A highly efficient 57 pm Tm-doped fiber laser with two multimode fiber Bragg gratings

Tao

Huang

et al. 2013

Laser Phys.

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An LD-clad pumped Tm-doped fiber laser is built with two multimode double-clad fiber Bragg gratings (FBGs) to generate narrow linewidth output around 2 µm. The slope efficiency of this laser system is 43.1% with respect to the launched pump power, corresponding to a quantum efficiency of 109%, which means that at least 9% of the doped thulium ions take part in the two-for-one cross relaxation process. Exploiting two multimode FBGs and wrapping the fiber onto an aluminum spool, a single peak narrow linewidth spectrum is generated. A 3 dB linewidth of 57 pm centering at 1996.2 nm is obtained at an output of 3.6 W.

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Section: Resultsmentioning

confidence: 99%

A highly efficient 57 pm Tm-doped fiber laser with two multimode fiber Bragg gratings

Tao

Huang

et al. 2013

Laser Phys.

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“…Focused development under the DARPA SHEDs program has also lead to extremely high power conversion efficiency in the 9xx-nm wavelength band, leading to diode bars with efficiency in excess of 74% and a clear route to efficiencies superior to 85% at room temperature (Crump et al, 2007). With demonstrated slope efficiency of optical fibers on the order of 80% (Jeong et al, 2004) and a demonstrated efficiency of spectral beam combining techniques of 91% (Drachenberg et al, 2011), we consider in this paper a global E/O efficiency of 50%. Detailed calculations performed on Forsterite by Thiry et al (2016) indicate that the coupling coefficient of a CW laser operating under the plasma formation intensity near the 1 micron wavelength is dictated mainly by 2 parameters: the laser intensity Φ [W/m 2 ] which depends on the laser output power and focusing ability of the optics as well as the mean time available to heat the material which is roughly proportional to the ratio between the laser beam diameter and the relative speed of the asteroid surface with respect to the laser beam (on the order of 6 cm/s if one considers the spin-limit of a 156 m asteroid).…”

Section: Laser Ablationmentioning

confidence: 99%

Statistical multi-criteria evaluation of non-nuclear asteroid deflection methods

Thiry

Vasile

2017

Acta Astronautica

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This version is available at https://strathprints.strath.ac.uk/61691/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the AbstractIn this paper we assess and compare the effectiveness of four classes of nonnuclear asteroid deflection methods applied to a wide range of virtual collision scenarios. We consider the kinetic impactor, laser ablation, the ion beaming technique and two variants of the gravity tractor. A simple but realistic model of each deflection method was integrated within a systematic approach to size the spacecraft and predict the achievable deflection for a given mission and a given maximum mass at launch. A sample of 100 synthetic asteroids was then created from the current distribution of NEAs and global optimisation methods were used to identify the optimal solution in each case according to two criteria: the minimum duration between the departure date and the time of virtual impact required to deflect the NEA by more than two Earth radii and the maximum miss-distance achieved within a total duration of 10 years. Our results provide an interesting insight into the range of applicability of individual deflection methods and argue the need to develop multiple methods in parallel for a global mitigation of all possible threats.

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“…In the last decade, output power of fiber lasers increase dramatically. In the laboratory, several kilowatts can be achieved with a single fiber [1] and mature products of kW fiber laser can be offered in the field of industry [2].…”

Section: Introductionmentioning

confidence: 99%

Solutions of kW Continuous-wave All-fiber Laser

Yan¹,

Li²,

Liu³

et al. 2011

J. Phys.: Conf. Ser.

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Abstract. Solutions of kW continuous-wave (CW) all-fiber laser are proposed. In our solutions, master oscillator power amplifier (MOPA) configuration is applied. Output power of master oscillator is 10W, and then is amplified to 70W with 1st pre-amplifier and next scaled up to 400W. Finally, 400W fiber laser is used as a basic power unit, and 1000W all-fiber laser can be achieved by means of beam combining with large core double clad fiber (DCF) combiner. In this solution, fiber laser has good stability and reliability for dispersion coupling of pump source and inhibition of photon darkening effect in the fiber. In addition, this solution assures us realize a 1000W all-fiber laser product easily, and the cost is low.

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Ytterbium-doped large-core fiber laser with 1.36 kW continuous-wave output power

Cited by 836 publications

References 8 publications

A highly efficient 57 pm Tm-doped fiber laser with two multimode fiber Bragg gratings

A highly efficient 57 pm Tm-doped fiber laser with two multimode fiber Bragg gratings

Statistical multi-criteria evaluation of non-nuclear asteroid deflection methods

Solutions of kW Continuous-wave All-fiber Laser

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