High-power linear-polarization burst-mode all-fibre laser and generation of frequency-adjustable microwave signal

Abstract Narrowband microwave generation with tuneable frequency is demonstrated by illuminating a photoconductive semiconductor switch (PCSS) with a burst-mode fibre laser. The whole system is composed of a high-power linearly polarized burst-mode pulsed fibre laser and a linear-state PCSS. To obtain a high-performance microwave signal, a desired envelope of burst is necessary and a pulse pre-compensation technique is adopted to avoid envelope distortion induced by the gain-saturation effect. Resulting from the technique, homogenous peak power distribution in each burst is ensured. The maximum energy of the laser burst pulse reaches 200 μJ with a burst duration of 100 ns at the average power of 10 W, corresponding to a peak power of 4 kW. When the PCSS is illuminated by the burst-mode fibre laser, narrowband microwave generation with tuneable frequency (0.80–1.12 GHz) is obtained with a power up to 300 W. To the best of the authors’ knowledge, it is the first demonstration of frequency-tuneable narrowband microwave generation based on a fibre laser. The high-power burst-mode fibre laser reported here has great potential for generating high-power arbitrary microwave signals for a great deal of applicable demands such as smart adaptive radar and intelligent high-power microwave systems.

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Yb3+ doped single-mode silica fibre laser system for high peak power applications

Photonics Letters of Poland ◽

10.4302/plp.v12i4.1075 ◽

2020 ◽

Vol 12 (4) ◽

pp. 118

Author(s):

Marcin Franczyk ◽

Dariusz Pysz ◽

Filip Włodarczyk ◽

Ireneusz Kujawa ◽

Ryszard Buczyński

Keyword(s):

High Power ◽

Fiber Lasers ◽

Peak Power ◽

Average Power ◽

Single Mode ◽

High Energy ◽

High Peak ◽

Fibre Laser ◽

High Peak Power ◽

Nanosecond Pulses

We present ytterbium doped silica single-mode fibre components for high power and high energy laser applications. We developed in-house the fibre laser with high efficiency of 65% according to the launched power, the threshold of 1.16W and the fibre length of 20 m. We also elaborated the fibre with 20 µm in diameter core suitable for amplifying the beam generated in oscillator. We implemented made in-house endcaps to prove the utility of the fibre towards high peak power applications. Full Text: PDF ReferencesStrategies Unlimited, The Worldwide Market for Lasers: Market Review and Forecast, 2020 DirectLink J. Zhu, P. Zhou, Y. Ma, X. Xu, and Z. Liu, "Power scaling analysis of tandem-pumped Yb-doped fiber lasers and amplifiers", Opt. Express 19, 18645 (2011) CrossRef IPG Photonics, Product information, accessed: October, 2020. DirectLink J.W. Dawson, M. J. Messerly, R. J. Beach, M. Y. Shverdin, E. A. Stappaerts, A. K. Sridharan, P. H. Pax, J. E. Heebner, C. W. Siders, and C. P. J. Barty, "Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power", Opt. Express 16, 13240 (2008) CrossRef W. Koechner, "Solid-State Laser Engineering", Springer Series in Optical Science, Berlin 1999 CrossRef A. V. Smith, and B. T. Do, "Bulk and surface laser damage of silica by picosecond and nanosecond pulses at 1064 nm", Appl. Opt. 47, 4812 (2008), CrossRef M. N. Zervas, C. Codemard, "High Power Fiber Lasers: A Review", IEEE J. Sel. Top. Quantum Electron. 20, 1, 2014 CrossRef D.J. Richardson, J. Nilsson, and W.A. Clarkson, "High power fiber lasers: current status and future perspectives [Invited]", J. Opt. Soc. Am. B, 27, 63, 2010, CrossRef M. Li, X. Chen, A. Liu, S. Gray, J. Wang, D. T. Walton; L. A. Zenteno, "Limit of Effective Area for Single-Mode Operation in Step-Index Large Mode Area Laser Fibers", J. Lightw. Technol., 27, 3010, 2009, CrossRef J. Limpert, S. Hofer, A. Liem, H. Zellmer, A. Tunnermann., S. Knoke, and H. Voelckel, "100-W average-power, high-energy nanosecond fiber amplifier", App.Phys.B 75, 477, 2002, CrossRef

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High power neodymium-doped single transverse mode fibre laser

Electronics Letters ◽

10.1049/el:19931000 ◽

1993 ◽

Vol 29 (17) ◽

pp. 1500 ◽

Cited By ~ 116

Author(s):

H. Po ◽

J.D. Cao ◽

B.M. Laliberte ◽

R.A. Minns ◽

R.F. Robinson ◽

...

Keyword(s):

High Power ◽

Transverse Mode ◽

Fibre Laser ◽

Mode Fibre

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High peak power, high-energy, high-average power pulsed fibre laser system with versatile pulse duration and shape

2013 Conference on Lasers & Electro-Optics Europe & International Quantum Electronics Conference CLEO EUROPE/IQEC ◽

10.1109/cleoe-iqec.2013.6801333 ◽

2013 ◽

Author(s):

A. Malinowski ◽

P. Gorman ◽

C.A. Codemard ◽

F. Ghiringhelli ◽

A. J. Boyland ◽

...

Keyword(s):

Pulse Duration ◽

Peak Power ◽

Laser System ◽

Average Power ◽

High Energy ◽

High Peak ◽

Fibre Laser ◽

High Peak Power ◽

High Average Power

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Anaerobic Cycling Power Output with Variations in Recumbent Body Configuration

Journal of Applied Biomechanics ◽

10.1123/jab.17.3.204 ◽

2001 ◽

Vol 17 (3) ◽

pp. 204-216 ◽

Cited By ~ 6

Author(s):

Raoul F. Reiser ◽

Michael L. Peterson ◽

Jeffrey P. Broker

Keyword(s):

Lower Extremity ◽

Body Mass ◽

Power Output ◽

Peak Power ◽

High Performance ◽

Anaerobic Power ◽

Average Power ◽

Knee Joints ◽

Anaerobic Power Output ◽

Human Powered

While the recumbent cycling position has become common for high-performance human-powered vehicles, questions still remain as to the influence of familiarity on recumbent cycling, the optimal riding position, and how recumbent cycling positions compare to the standard cycling position (SCP). Eight recumbent-familiar cyclists and 10 recreational control cyclists were compared using the 30-s Wingate test in 5 recumbent positions as well as the SCP. For the recumbent positions, hip position was maintained 15° below the bottom bracket while the backrest was altered to investigate body configuration angle (BCA: the angle between the bottom bracket, hip, and a marker at mid-torso) changes from 100° to 140° in 10° increments. Between-groups analysis found that only 4 of the 126 analyzed parameters differed significantly, with all trends in the same direction. Therefore both groups were combined for further analysis. Whole-group peak power (14.6 W/kg body mass) and average power (9.9 and 9.8 W/kg body mass, respectively) were greatest in the 130° and 140° BCA positions, with power dropping off as BCA decreased through 100° (peak = 12.4 W/kg body mass; avg. = 9.0 W/kg body mass). Power output in the SCP (peak = 14.6 W/kg body mass; avg. = 9.7 W/kg body mass) was similar to that produced in the 130° and 140° recumbent BCA. Average hip and ankle angles increased (became more extended/ plantar-flexed), 36° and 10°, respectively, with recumbent BCA, while knee angles remained constant. The lower extremity kinematics of the 130° and 140° BCA were most similar to those of the SCP. However, SCP hip and knee joints were slightly extended and the ankle joint was slightly plantar-flexed compared to these two recumbent positions, even though the BCA of the SCP was not significantly different. These findings suggest: (a) the amount of recumbent familiarity in this study did not produce changes in power output or kinematics; (b) BCA is a major determinant of power output; and (c) recumbent-position anaerobic power output matches that of the SCP when BCA is maintained, even though lower extremity kinematics may be altered.

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Erratum: High power neodymium-doped single transverse mode fibre laser

Electronics Letters ◽

10.1049/el:19931498 ◽

1993 ◽

Vol 29 (25) ◽

pp. 2231

Author(s):

H. Po ◽

J.D. Cao ◽

B.M. Laliberte ◽

R.A. Minns ◽

R.F. Robinson ◽

...

Keyword(s):

High Power ◽

Transverse Mode ◽

Fibre Laser ◽

Mode Fibre

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Design of Multi-Mode Microwave Control Combination for InSAR System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.367.401 ◽

2013 ◽

Vol 367 ◽

pp. 401-404

Author(s):

Yuan Yuan ◽

Xue Quan Yan ◽

Zheng Lin Cao

Keyword(s):

High Power ◽

Peak Power ◽

Average Power ◽

Center Frequency ◽

Switch Time ◽

Combination System ◽

Microwave Control ◽

External Interface ◽

Multi Mode ◽

The Way

This paper provides a multi-mode Microwave Control Combination (MCC) for InSAR system, where the center frequency is F0 with 800 MHz bandwidth, and the size is smaller than 355mm×480mm×155mm. A special InSAR system is introduced with finite baseline between antennas, gets the equal baseline longer by the way of MCC fast switch and makes the channel phrase satisfy the special InSAR system demand. In the MCC design, isolation between antenna channels, high-power and fast channel switch of the system are considered firstly, which are very important in finite airborne space for this InSAR system. The combination system can be changed to three working modes with different configuration but same external interface. This MCC can support average power 400w and peak power 4000w, achieve isolation between radiation channels more than 48dB and channel switch time less than 10μs.

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