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Birkerød, Denmark

Moselund P.M.,NKT Photonics
Fiber Lasers and Applications, FILAS 2012 | Year: 2012

In this talk, we will present results on Mid-infrared supercontinuum generation using modelocked lasers. We will also discuss the challenges and potential applications of supercontinuum generation beyond the silica transmission window. © 2012 OSA.

Eidam T.,Friedrich - Schiller University of Jena | Hanf S.,Friedrich - Schiller University of Jena | Seise E.,Friedrich - Schiller University of Jena | Andersen T.V.,NKT Photonics | And 6 more authors.
Optics Letters | Year: 2010

In this Letter we report on the generation of 830 W compressed average power from a femtosecond fiber chirped pulse amplification (CPA) system. In the high-power operation we achieved a compressor throughput of about 90% by using high-efficiency dielectric gratings. The output pulse duration of 640 fs at 78 MHz repetition rate results in a peak power of 12 MW. Additionally, we discuss further a scaling potential toward and beyond the kilowatt level by overcoming the current scaling limitations imposed by the transversal spatial hole burning. © 2010 Optical Society of America.

Ramsay J.,University of Aarhus | Dupont S.,University of Aarhus | Johansen M.,University of Aarhus | Rishoj L.,Technology University of Denmark | And 3 more authors.
Optics Express | Year: 2013

Using femtosecond upconversion we investigate the time and wavelength structure of infrared supercontinuum generation. It is shown that radiation is scattered into higher order spatial modes (HOMs) when generating a supercontinuum using fibers that are not single-moded, such as a step-index ZBLAN fiber. As a consequence of intermodal scattering and the difference in group velocity for the modes, the supercontinuum splits up spatially and temporally. Experimental results indicate that a significant part of the radiation propagates in HOMs. Conventional simulations of super-continuum generation do not include scattering into HOMs, and including this provides an extra degree of freedom for tailoring supercontinuum sources. © 2013 Optical Society of America.

Lovgreen S.,NKT Photonics
Laser Focus World | Year: 2014

NKT Photonics has been manufacturing low-noise, single-frequency, distributed-feedback (DFB) design fiber lasers that is essentially a short and robust laser cavity. The high Q value and the relatively long length of the DFB cavity, combined with long radiative lifetimes of rare earth ions in silica, provide for fundamentally low values of phase noise and spectral linewidth. Careful packaging design and use of low-noise pump sources reduce effects of vibrations and acoustic noise, and technical noise. Low-noise fiber lasers also play an important role in a new generation of wind-sensing light-detection-and- ranging (lidar) systems for meteorology, where the Doppler shift of light scattered by aerosols (Mie scattering) is used to indirectly measure wind velocity and turbulence by coherent homodyne detection. The NKT Photonics low-noise fiber lasers are designed to match the helium transition line at 1083 nm; the laser light pumps helium in the magnetometer, amplifying electronic magnetic resonance effects in the instrument.

Alkeskjold T.T.,NKT Photonics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

A Large-Mode Area (LMA) single-mode Ytterbium-doped fiber amplifier with distributed narrow passband filtering is demonstrated. The fiber passband is ~ 40nm wide and centered at 1070nm for efficient filtering of both short- and longwavelength Amplified Spontaneous Emission (ASE) as well as Stimulated Raman Scattering (SRS). The fiber design provides Higher-Order Mode (HOM) suppression and is polarization maintaining. It has a mode field diameter of 27μm and exhibits a slope efficiency of >60%. © 2010 Copyright SPIE - The International Society for Optical Engineering.

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