Concept

Laser beam machining

Publications associées (63)

Second harmonic generation with free running Nd : YAG laser

René Salathé, Thomas Sidler, Sébastian Favre

First results and analysis of second harmonic generation with a Nd:YAG laser working in the long pulse, free running mode are presented in this paper. Second harmonic generation conversion efficiencies of up to 17.5% and pulse powers of 162W have been gene ...

2003

Influence of Nd : YAG parameters on the selective laser sintering of metallic powders

Rémy Glardon, Valerio Romano

Compared with CW CO2 laser sources, Nd:YAG lasers with Q-switching capability offer a wider parameter range, with improved sintering control, due to the short pulsed energy delivery. In particular, thermal diffusion being strictly limited by the nanosecond ...

2001

Génération de deuxième et troisième harmonique avec un laser Nd:YAG en régime pulsé libre

Sébastian Favre

Industrial laser precision machining is predominately based on pulsed Nd:YAG lasers operated at a wavelength of 1.06 µm in a free running pulse regime. The objective of this thesis work has been to investigate second and third harmonic generation for such ...

EPFL2001

High power second harmonic generation with free running Nd : YAG slab laser for micro-machining applications

René Salathé, Thomas Sidler, Sébastian Favre

Frequency doubled Nd:YAG lasers represent an attractive alternative to other laser tools for many material processing applications, but frequency doubling with pulsed Nd:YAG lasers has been performed until now only with pulses of tens of nanoseconds. In ma ...

2000

Diode-pumped solid body laser used in ophthalmology comprises an acoustic-optical modulator, a laser crystal, a delay plate and a crystal that doubles the frequency of the laser beam

Theo Lasser

Diode-pumped solid body laser comprises an acoustic-optical modulator, a laser crystal, a delay plate and a crystal that doubles the frequency of the laser beam. Pulse lengthening is carried out by internal coupling of a doubler mechanism within the laser ...

2000

Raman DIAL measurement of ozone and water vapor in the lower troposphere

Hubert van den Bergh, Bertrand Calpini, Valentin Simeonov, Gilles Larchevêque

A new lidar for the measurement of tropospheric ozone is proposed, based on the differential analysis of the Raman backscattered signals on nitrogen and oxygen, which is far less sensitive to the aerosols than the classical DIAL system. Using a third Raman ...

1999

High-Power Nd-Doped Fiber Amplifier for Coherent Intersatellite Links

René Dändliker

Intersatellite optical communication links require laser beams of at least 1 W of power modulated at gigahertz frequencies. They can be delivered by a master oscillator power amplifier system which consists of a stable single-frequency Nd:YAG laser, a high ...

1999

Poloidal polarimeter system for current density measurements in ITER

The polarimeter system for ITER features 10 viewing chords covering almost the full poloidal cross section of the plasma in a fan-like arrangement. The 10 laser beams all enter the plasma via 150 mm diam penetrations through the diagnostic plug at the low- ...

1999

Raman frequency shifting in a CH4:H2:Ar mixture pumped by the fourth harmonic of a Nd:YAG laser

Hubert van den Bergh, Bertrand Calpini, Valentin Simeonov, Valentin Mitev

Mixts. of methane, H, and Ar (CH4:H2:Ar) were studied as UV Raman shifters for ozone differential absorption lidar application. They have higher photochem. stability than pure CH4 and the capability to produce, with high enough efficiency, either 1st CH4 S ...

1998

Laser linewidth determination in the sub-Megahertz range using a Brillouin fibre laser

Luc Thévenaz, Philippe Robert

The Brillouin fibre laser has experimentally demonstrated its suitability for the measurement of laser linewidth in the 1 kHz to 500 kHz frequency range. A major advantage of this system is to be widely independent of the source wavelength by generating th ...

Telenor1996

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