Visible double-clad upconversion fibre laser

Zellmer, H.; Plamann, Karsten; Huber, G.; Scheife, H.; Tünnermann, Andreas

doi:10.1049/el:19980415

Cited by 14 publications

(4 citation statements)

References 7 publications

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“…It can be achieved by different methods: one method is to use the amplified spontaneous emission (ASE) operation by means of a fibre with reduced surface reflections [54] instead of the laser operation. Alternatively, fibre lasers with short lengths [56] can be employed. Due to resulting large mode spacing, mode beatings larger than the detector bandwidth are suppressed (see below).…”

Section: Employment Of Diode-pumped Lasers In Ldvmentioning

confidence: 99%

“…Based on this principle, up-conversion fibre lasers have been realized. They emit around 100 mW of fundamentalmode power in the visible spectral range [56,85,86]. Power noise due to relaxation oscillation is about 3% [86], but mode-beat noise is generally suppressed, since the used fibre lengths are lower than 1 m, resulting in mode spacing of over 100 MHz, equation (2).…”

Section: 34mentioning

confidence: 99%

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Laser Doppler velocimetry using powerful solid-state light sources

Czarske

2006

Meas. Sci. Technol.

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Opto-electronic measurement techniques are well established in fluid flow investigations. Their advantages are that they are non-intrusive, provide highly accurate measurement data and have fast response times. Laser Doppler velocimetry (LDV) is one of the most important methods for velocity measurements with high spatial and temporal resolution. Diode lasers and diode-pumped solid-state lasers as well as glass fibres and micro-optics are employed to an increasing extent. Particularly, the development of solid-state lasers proceeds rapidly. New lasers with improved properties such as high-power fundamental-mode emission make it possible to develop enhanced LDV sensor heads. This may open up new fields of application, for example in medicine and aerospace technology. The aim of this review is to describe the present state-of-the-art in LDV and to demonstrate how new laser concepts can still contribute to the development of new, improved LDV sensors. For that purpose, solid-state lasers such as diode lasers and diode-pumped solid-state lasers are introduced, and concepts of communication engineering for accomplishing directional multi-component velocity measurements are discussed. Also, velocity measurements with high spatial resolution are reported. A conclusive overview of applications and an outlook on future challenges are outlined.

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Section: Employment Of Diode-pumped Lasers In Ldvmentioning

confidence: 99%

Section: 34mentioning

confidence: 99%

Laser Doppler velocimetry using powerful solid-state light sources

Czarske

2006

Meas. Sci. Technol.

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“…Materials such as Yb-sensitized praseodymium (output at 635 nm) [8] and Ybsensitized thulium (output at 482 nm) [9] have been used to make so-called upconversion fiber lasers that emits in the visible part of the spectrum. These lasers are special since they emit light at wavelengths shorter than the wavelength at which they are pumped.…”

Section: Active Ions and Host Materialsmentioning

confidence: 99%

Amplifiers and Lasers in PCF Configurations

Hougaard

Nielsen

2004

J Optic Comm Rep

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In this paper we will present an overview of the use of photonic crystal fibers as fiber amplifiers. We will describe the basic concepts of optical amplification, and how to do numerical modelling of such components. We will then identify advantages and disadvantages of amplifiers based on PCF technology compared to conventional fibers, and then go into greater detail on some of these specific applications, such as low pump power amplifiers, and high-power double-clad amplifiers and lasers.

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“…Die Mehrphotonenanregung mit infraroten Lasern ermöglichte eine sichtbare Emission der Faserlaser mit mehreren 100 mW Grundmodeleistung, z.B. [13]. Die genutzten Faserlängen von um Im ergeben einen longitudinalen Modenabstand fu um 100 MHz, siehe oben.…”

Section: Diodengepumpte Faserlaserunclassified

Nutzung diodengepumpter Faserlaser in der Laser-Doppler-Anemometrie/Application of diode-pumped fiber lasers for laser Doppler anemometry

Czarske¹,

Zellmer²,

Piamann³

et al. 1999

tm - Technisches Messen

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Laser Zentrum Hannover e.V. Diodengepumpte Faserlaser vereinigen den hohen Wirkungsgrad und einfachen, kompakten Aufbau von Diodenlasern mit der hohen Strahlqualität von Glaslasern. Sie erreichen derzeit über 30W Leistung mit hoher Strahlqualität in einem kompakten, kostengünstigen Aufbau. Daher sind Faserlaser für die Realisierung von portablen Laser-Doppler-Anemometern (LDA) hoher Leistung attraktiv. In diesem Aufsatz wird auf den aktuellen Stand der Entwicklung von Faserlasern und deren Einsatz für kompakte LDA-Systeme eingegangen. Dabei wird insbesondere über neodym-dotierte Quarzglas-Faserlaser mit einer leistungsstarken Emission im Infraroten und über sichtbare Up-Conversion-Faserlaser berichtet. Das LDA-System wurde mit dem Einsatz eines Beugungsgitters als diffraktivem Strahlteiler realisiert. Es wird gezeigt, daß damit ein achromatisches Meßsystem erhalten wird, so daß leistungsstarke Faserlaser großer Linienbreite eingesetzt werden können. Darüber hinaus weist die diffraktive Optik ein hohes Miniaturisierungspotential auf, das für die Konstruktion eines kompakten faseroptischen LDAMeßkopfes genutzt wurde. Eingegangen wird ferner auf die Realisierung einer Richtungserkennung des achromatischen LDA-Systems mit dem Einsatz eines akusto-optischen Modulators als diffraktivem Strahlteiler und gleichzeitigem Frequenzverschiebungselement.Diode-pumped fiber lasers emit today more than 30W of fundamental mode power. Due to their compact realization at low costs, they are attractive for portable high power laser Doppler anemometers (LDA). We present the state-of-the-art of fiber lasers with emphasis on Nd:glass fiber lasers with high power emission in the infrared and up-conversion fiber lasers with visible emission wavelengths. The LDA system is realized by using a phase diffraction grating as a beam splitter. An achromatic LDA system is shown, which enables the employment of high power fiber lasers having large emission line widths. Diffraction optics was used for the realization of a miniaturized fiber-coupled LDA measuring head. The directional discrimination of the achromatic LDA system was achieved by an acousto-optical modulator as both a diffractive beam splitter and as a frequency shifter.

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Visible double-clad upconversion fibre laser

Cited by 14 publications

References 7 publications

Laser Doppler velocimetry using powerful solid-state light sources

Laser Doppler velocimetry using powerful solid-state light sources

Amplifiers and Lasers in PCF Configurations

Nutzung diodengepumpter Faserlaser in der Laser-Doppler-Anemometrie/Application of diode-pumped fiber lasers for laser Doppler anemometry

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