Prof. Johan Nilsson
at Univ. of Southampton
SPIE Involvement:
Author | Instructor | Student Chapter Advisor
Publications (38)

Proceedings Article | 13 March 2024 Presentation
Changshun Hou, Debasis Pal, Johan Nilsson
Proceedings Volume PC12864, PC1286402 (2024)
KEYWORDS: Zinc selenide, Carbon monoxide, Turbines, Laser imaging, Crystals, Tunable diode lasers, Tomography, Single mode fibers, Simulations, Signal attenuation

Proceedings Article | 5 March 2021 Presentation
Proceedings Volume 11665, 116650N (2021)
KEYWORDS: Fiber lasers, Ions, Ytterbium, Energy transfer, Erbium

SPIE Journal Paper | 24 August 2020 Open Access
Nan Zhao, Soonki Hong, Achar Harish, Yutong Feng, Johan Nilsson
OE, Vol. 59, Issue 08, 089801, (August 2020)
KEYWORDS: Raman spectroscopy, Optical amplifiers, High power fiber amplifiers, Fiber amplifiers, Cladding, Photonic devices, Optoelectronics, Optical engineering

SPIE Journal Paper | 4 October 2019
OE, Vol. 58, Issue 10, 102703, (October 2019)
KEYWORDS: Fiber amplifiers, Optical amplifiers, Scattering, Modulation, Raman spectroscopy, Optical engineering, Signal processing, Erbium, Optical fibers, Bragg cells

SPIE Journal Paper | 25 September 2019 Open Access
Nan Zhao, Soonki Hong, Achar Harish, Yutong Feng, Johan Nilsson
OE, Vol. 58, Issue 10, 102701, (September 2019)
KEYWORDS: Raman spectroscopy, Semiconductor lasers, Cladding, Fiber lasers, Fiber amplifiers, High power fiber amplifiers, Optical amplifiers, Signal attenuation, Optical engineering

Showing 5 of 38 publications
Proceedings Volume Editor (2)

SPIE Conference Volume | 16 February 2006

SPIE Conference Volume | 22 April 2005

Conference Committee Involvement (5)
Fiber Lasers V: Technology, Systems, and Applications
21 January 2008 | San Jose, California, United States
Fiber Lasers IV: Technology, Systems, and Applications
22 January 2007 | San Jose, California, United States
Fiber Lasers III: Technology, Systems, and Applications
23 January 2006 | San Jose, California, United States
Fiber Lasers II: Technology, Systems, and Applications
24 January 2005 | San Jose, California, United States
Fiber Lasers: Technology, Systems, and Applications
26 January 2004 | San Jose, Ca, United States
Course Instructor
SC748: High-Power Fiber Sources
This course describes the current state of the art, research directions, and principles of high-power fiber lasers and amplifiers. Recent advances have permitted output powers of these devices to reach well over a kilowatt, and underpinning fiber technology, pump lasers and pump coupling will be addressed. Rare-earth-doped fiber devices including those based on Yb-doped fibers at 1.0 - 1.1 μm and the more complicated Er:Yb codoped fibers at 1.5 - 1.6 μm and Tm-doped fibers at 2 μm will be described in detail. Operating regimes extend from continuous-wave single-frequency to short pulses. Key equations will be introduced to establish limits and identify critical parameters. For example, high pump brightness is critical for some devices but not others. Methods to mitigate limitations in different operating regimes will be discussed. A large core is a critical fiber design feature of high-power fiber lasers, and the potential and limits of this approach will be covered, e.g., as it comes to beam quality. Advanced options such as beam combining and electronic control for enhanced performance will be considered, as well, together with other topics of particular interest to attendees (insofar as time allows).
SC228: Fiber Laser Sources and Amplifiers for Lightwave System Applications
Rare-earth-doped fiber lasers and amplifiers have revolutionized the field of optical communications. Amplifiers allow propagating multiple-wavelength light signals modulated at extremely high bit rates along fibers thousands of kilometers long. Fiber lasers provide coherent light emission in wavelength regions (ultraviolet to mid-infrared) and with power and coherence properties not available from diode lasers. This course describes the spectroscopy of rare-earth-doped glass fibers, the operating principles of the laser and amplifier devices based on these fibers, and the basic mathematical models that describe their performance. It also provides a broad overview of the different types of fiber lasers and amplifiers, as well as detailed descriptions of cornerstone devices, such as Er-doped fiber amplifiers, Raman fiber amplifiers, and high-power Yb-doped and Nd-doped fiber master-oscillator power amplifiers. The performance and characteristics of numerous representative devices are reviewed, including the configuration, threshold, conversion efficiency, and polarization behavior of fiber lasers, and the pumping schemes, gain, noise, and polarization dependence of fiber amplifiers.
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