Open-loop wavelength selective external resonator and beam combining system

A beam, external cavity technology, applied in the field of laser systems, can solve the problem of reducing the efficiency of DWBC systems

Inactive Publication Date: 2017-08-18
TRUMPF LASER GMBH CO KG
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Problems solved by technology

However, spatial filtering is a lossy procedure that can cause a significant reduction in the efficiency of the DWBC system

Method used

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  • Open-loop wavelength selective external resonator and beam combining system
  • Open-loop wavelength selective external resonator and beam combining system
  • Open-loop wavelength selective external resonator and beam combining system

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Embodiment Construction

[0017] This disclosure describes various dense wavelength beam combining (DWBC) systems that combine multiple individual input beams into a single output beam. The DWBC system envisaged herein is an open loop configuration, ie a configuration in which the wavelength selective optics of the feedback generating system (which may also be referred to as wavelength stabilization system) are decoupled from the beam combining system. In particular, each constituent beam of the combined output beam produced by the beam combining system traverses an optical path that does not include wavelength selective optics of the feedback generating system.

[0018] Performing spatial filtering and crosstalk mitigation in the low power region of the external cavity of the DWBC system limits the loss of output power attributable thereto. Thus, compared to configurations in which the wavelength-selective optics of the feedback component system form part of the optical path between the multiple input...

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Abstract

A variety of dense wavelength beam combining (DWBC) apparatuses are described herein that combine a plurality of individual input beams into a single output beam. DWBC apparatuses contemplated herein are open-loop configurations, i.e. configurations where the wavelength selective optics of a feedback generation system are decoupled from a beam combining system that combines a plurality of input beams each having a wavelength selected from a range of different wavelengths. Specifically, each constituent beam of the combined output beam produced by the beam combining system traverses an optical path that does not include the wavelength-selective optics of the feedback generation system. DWBC apparatuses contemplated herein further provide for matching the wavelength-dependent angular dispersion functions of optics of the feedback generation system with the wavelength-dependent angular dispersion functions of optics of the beam combining system. The external cavity laser diode array comprises edge-emitting LD (111A-111N), a focussing optics (112) for divergence control of the emitted beams onto diffracting optics (115), a retroreflector (120) and a half-wave plate (113) and a polarizer (114) for control of the output power. An intra-cavity spatial filter (116) may be used to control the spatial beam quality and an extra-cavity dispersive optics (122) for delivering a combined multi-wavelength high power beam.

Description

technical field [0001] The present disclosure relates generally to laser systems, and more particularly to systems and methods for narrow bandwidth laser beam stabilization and multiple laser beam combining. Background technique [0002] Dense Wavelength Beam Combining (DWBC) technology enables multiple relatively low power input beams to be spatially superimposed to produce a single high power output beam. To ensure high-power output beam quality, DWBCs require wavelength locking of each individual emitter. Wavelength locking refers to forcing the vast majority of radiation emitted by an emitter to have wavelengths that fall within a narrow spectrum of desired wavelengths. The DWBC system achieves wavelength locking of each individual transmitter by providing wavelength selective feedback. Wavelength selective feedback stimulates the emission of radiation at desired wavelengths, which excludes radiation at undesired wavelengths. DWBC systems can utilize resonator cavitie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/40
CPCH01S5/4062H01S5/4068H01S3/0805H01S5/141H01S5/4012H01S5/4031H01S5/405H01S5/4087
Inventor A·基利S·里德C·蒂尔科恩H·齐莫尔
Owner TRUMPF LASER GMBH CO KG
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