Trumpf Laser Gmbh

Steffen Ried

Alexander Killi

Christoph Tillkorn

Hagen Zimer

Rudolf Huber

Thilo Vethake

Viorel C Negoita

Stephan Strohmaier

Yufeng Li

Haiyan An

Simon Nagel

Markus Ginter

Tobias Barnowski

Wavelength-selective external resonators can be used to greatly increase the output brightness of dense wavelength beam combining (DWBC) system beams by stabilizing the wavelengths of the beams emitted by the individual emitters of the DWBC laser source. The present invention pertains to external resonant cavities that utilize thin-film filtering elements as wavelength-selective elements in external resonators. The present invention further pertains to particular embodiments that utilize thin-film filtering elements in DWBC systems as both output beam coupling elements and wavelength selective elements. The present invention provides advantages over the prior art that include decreased cost, increased fidelity of wavelength selection, and increased wall plug efficiency.

Wavelength selective external resonator and beam combining system for dense wavelength beam combining laser

An external cavity laser apparatus according to an embodiment of the invention is provided. The external cavity laser apparatus includes a plurality of beam emitters that collectively emit a plurality of emitted beams that each includes a primary component emitted beam. A first reflective element is configured to reflect the plurality of primary component emitted beams and a first polarizing optic disposed in the optical path of the plurality of primary component emitted beams is configured to rotate a polarization of each primary component emitted beam to produce a first rotated primary component beam having a first linear polarization and a second rotated primary component beam having a second linear polarization. A polarized beam splitter is configured to direct first feedback system output component beams into an output beam, and to direct second feedback system output component beams to the plurality of beam emitters as feedback beams.

Dense wavelength beam combining with variable feedback control

A device for wavelength coupling of laser beams () with different wavelengths (&#x3bb;, . . . &#x3bb;), comprising: at least one laser source for generating a plurality of laser beams (), and an overlapping device for spatial overlapping of the plurality of laser beams () for forming an overlapped laser beam with a plurality of wavelengths (&#x3bb;. . . &#x3bb;). The device has a feedback device arranged between the laser source and the overlapping device for feeding a radiation proportion of the laser beams () to be overlapped back to the laser source, the feedback device comprising a partially reflecting angle-dispersive optical element, in particular a partially reflecting diffraction grating. The overlapping device may, for example, be configured as a transmitting or reflecting diffraction grating whose optical properties are adapted to the optical properties of the partially reflecting diffraction grating to overlap the laser beams () in an essentially dispersion-free manner.

Device for wavelength combining of laser beams

The present disclosure describes systems and methods for beam wavelength stabilization and output beam combining in dense wavelength multiplexing (DWM) systems. Systems and methods are described for performing beam wavelength stabilization and output beam combining in DWM systems while achieving increased wall-plug efficiency and enhanced beam quality. Interferometric external resonator configurations can be used to greatly increase the brightness of DWM system output beams by stabilizing the wavelengths of the beams emitted by the emitters of the DWM laser source. The resonant cavities described by the present disclosure provide advantages over the prior art in the form of decreased cost, increased wall plug efficiency and increased output beam quality. Particular implementations of the disclosure achieve increased wall plug efficiency and increased output beam quality through a combination of innovative cavity designs and the utilization of reflection diffraction elements for beam combining.

High brightness dense wavelength multiplexing laser

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Herrenberg, Germany

Steffen Ried