The Experts below are selected from a list of 15531 Experts worldwide ranked by ideXlab platform
Denis R. Hall - One of the best experts on this subject based on the ideXlab platform.
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Demonstration of high pointing accuracy dual-Axis collimation of 49 emitter diode bar using a laser-written custom phase-plate
High-Power Diode Laser Technology and Applications VIII, 2010Co-Authors: Natalia Trela, J. J. Wendland, Howard J. Baker, Denis R. HallAbstract:We present our work on a single optical component that combines fast-Axis smile and lens error correction with SlowAxis collimation, produced with a laser-cut phase-plate technique. Customized focal length of Slow-Axis lenses allows optimization of fill-factor of diode laser bars. In this paper we report on excellent beam properties obtained for a 49- single mode emitter array, 975 nm bar providing 30W cw output, with RMS pointing error of 3% and 6% of far-field divergence in fast- and Slow-Axis, respectively. We observed a pitch mismatch of 0.03% between the Slow-Axis lens array, with emitter pointing clearly affected by chip thermal expansion.
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Dual-Axis beam correction for an array of single-mode diode laser emitters using a laser-written custom phase-plate
Optics express, 2009Co-Authors: Natalia Trela, J. J. Wendland, Howard J. Baker, Denis R. HallAbstract:A single optical component for a diode laser bar combines fast-Axis smile and lens error correction with Slow-Axis collimation. Produced by laser-machining/polishing, it provides 0.9mm focal length, 200μm pitch Slow-Axis collimation on the same surface that corrects fast-Axis errors. Custom fabrication enables fill-factor optimization for the 49 single-mode beams and gives parallel collimation with rms pointing errors of 3% and 6% of the far-field divergence for the fast- and Slow-Axis array respectively. Sub-micron pitch mismatch between the Slow-Axis lens and emitter arrays, and beam pointing changes by thermal expansion of the laser bar are detected.
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Low-loss wavelength locking of a 49-element single mode diode laser bar with phase-plate beam correction
CLEO Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009Co-Authors: Natalia Trela, Roy Mcbride, Howard J. Baker, Denis R. HallAbstract:In previous work on laser diode optics, we have used laser-written phase-plates to correct the fabrication and fast-Axis collimation errors of diode laser bars and produce a restoration of brightness of up to a factor of 10. Recently, we extended the technique to provide both fast-Axis correction and Slow-Axis collimation in a single element, applied to an array of 10 tapered emitters with a 100µm pitch [1]. Here we report the use of dual-Axis correction for a full-length diode bar from Bookham, with 49 single mode emitters and 30W cw output at 975 nm. Fast-Axis smile and lens error correction is combined with laser-cut Slow Axis collimation to give highly parallel beams with far-field divergence of 2.6mrad (fast Axis) and 13mrad (Slow-Axis). Fig 1 shows the improvement in fast-Axis divergence, in the form of far-field pattern vs. emitter number.
Juliet T. Gopinath - One of the best experts on this subject based on the ideXlab platform.
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Fast-to-Slow Axis mode imaging for brightness enhancement of a broad-area laser diode array.
Optics express, 2013Co-Authors: Andrew M. Jones, Juliet T. GopinathAbstract:Broad-area laser (BAL) diodes have found use in numerous applications requiring multi-watt powers, but remain limited by poor spatial beam quality. A novel laser cavity that enhances the brightness of a BAL array has been demonstrated. Wavelength beam combining (WBC) is used to spatially overlap output from the emitters. Improved beam quality is achieved by imaging the fast-Axis mode onto the Slow Axis of the BAL array. The brightness is enhanced twofold over a typical Littman-Metcalf WBC cavity, reaching 47 MW·cm(-2)·sr(-1) at an output power of 1.16 W.
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Beam quality improvement of broad-area laser diodes by fast-to-Slow Axis mode imaging
CLEO: 2013, 2013Co-Authors: Andrew M. Jones, Juliet T. GopinathAbstract:A novel technique for beam quality improvement of a broad-area diode array has been demonstrated. For each emitter, the fast-Axis mode is imaged back onto the Slow Axis, improving beam quality while preserving slope efficiency.
Natalia Trela - One of the best experts on this subject based on the ideXlab platform.
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Demonstration of high pointing accuracy dual-Axis collimation of 49 emitter diode bar using a laser-written custom phase-plate
High-Power Diode Laser Technology and Applications VIII, 2010Co-Authors: Natalia Trela, J. J. Wendland, Howard J. Baker, Denis R. HallAbstract:We present our work on a single optical component that combines fast-Axis smile and lens error correction with SlowAxis collimation, produced with a laser-cut phase-plate technique. Customized focal length of Slow-Axis lenses allows optimization of fill-factor of diode laser bars. In this paper we report on excellent beam properties obtained for a 49- single mode emitter array, 975 nm bar providing 30W cw output, with RMS pointing error of 3% and 6% of far-field divergence in fast- and Slow-Axis, respectively. We observed a pitch mismatch of 0.03% between the Slow-Axis lens array, with emitter pointing clearly affected by chip thermal expansion.
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Dual-Axis beam correction for an array of single-mode diode laser emitters using a laser-written custom phase-plate
Optics express, 2009Co-Authors: Natalia Trela, J. J. Wendland, Howard J. Baker, Denis R. HallAbstract:A single optical component for a diode laser bar combines fast-Axis smile and lens error correction with Slow-Axis collimation. Produced by laser-machining/polishing, it provides 0.9mm focal length, 200μm pitch Slow-Axis collimation on the same surface that corrects fast-Axis errors. Custom fabrication enables fill-factor optimization for the 49 single-mode beams and gives parallel collimation with rms pointing errors of 3% and 6% of the far-field divergence for the fast- and Slow-Axis array respectively. Sub-micron pitch mismatch between the Slow-Axis lens and emitter arrays, and beam pointing changes by thermal expansion of the laser bar are detected.
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Low-loss wavelength locking of a 49-element single mode diode laser bar with phase-plate beam correction
CLEO Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009Co-Authors: Natalia Trela, Roy Mcbride, Howard J. Baker, Denis R. HallAbstract:In previous work on laser diode optics, we have used laser-written phase-plates to correct the fabrication and fast-Axis collimation errors of diode laser bars and produce a restoration of brightness of up to a factor of 10. Recently, we extended the technique to provide both fast-Axis correction and Slow-Axis collimation in a single element, applied to an array of 10 tapered emitters with a 100µm pitch [1]. Here we report the use of dual-Axis correction for a full-length diode bar from Bookham, with 49 single mode emitters and 30W cw output at 975 nm. Fast-Axis smile and lens error correction is combined with laser-cut Slow Axis collimation to give highly parallel beams with far-field divergence of 2.6mrad (fast Axis) and 13mrad (Slow-Axis). Fig 1 shows the improvement in fast-Axis divergence, in the form of far-field pattern vs. emitter number.
Andrew M. Jones - One of the best experts on this subject based on the ideXlab platform.
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Fast-to-Slow Axis mode imaging for brightness enhancement of a broad-area laser diode array.
Optics express, 2013Co-Authors: Andrew M. Jones, Juliet T. GopinathAbstract:Broad-area laser (BAL) diodes have found use in numerous applications requiring multi-watt powers, but remain limited by poor spatial beam quality. A novel laser cavity that enhances the brightness of a BAL array has been demonstrated. Wavelength beam combining (WBC) is used to spatially overlap output from the emitters. Improved beam quality is achieved by imaging the fast-Axis mode onto the Slow Axis of the BAL array. The brightness is enhanced twofold over a typical Littman-Metcalf WBC cavity, reaching 47 MW·cm(-2)·sr(-1) at an output power of 1.16 W.
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Beam quality improvement of broad-area laser diodes by fast-to-Slow Axis mode imaging
CLEO: 2013, 2013Co-Authors: Andrew M. Jones, Juliet T. GopinathAbstract:A novel technique for beam quality improvement of a broad-area diode array has been demonstrated. For each emitter, the fast-Axis mode is imaged back onto the Slow Axis, improving beam quality while preserving slope efficiency.
Howard J. Baker - One of the best experts on this subject based on the ideXlab platform.
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Demonstration of high pointing accuracy dual-Axis collimation of 49 emitter diode bar using a laser-written custom phase-plate
High-Power Diode Laser Technology and Applications VIII, 2010Co-Authors: Natalia Trela, J. J. Wendland, Howard J. Baker, Denis R. HallAbstract:We present our work on a single optical component that combines fast-Axis smile and lens error correction with SlowAxis collimation, produced with a laser-cut phase-plate technique. Customized focal length of Slow-Axis lenses allows optimization of fill-factor of diode laser bars. In this paper we report on excellent beam properties obtained for a 49- single mode emitter array, 975 nm bar providing 30W cw output, with RMS pointing error of 3% and 6% of far-field divergence in fast- and Slow-Axis, respectively. We observed a pitch mismatch of 0.03% between the Slow-Axis lens array, with emitter pointing clearly affected by chip thermal expansion.
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Dual-Axis beam correction for an array of single-mode diode laser emitters using a laser-written custom phase-plate
Optics express, 2009Co-Authors: Natalia Trela, J. J. Wendland, Howard J. Baker, Denis R. HallAbstract:A single optical component for a diode laser bar combines fast-Axis smile and lens error correction with Slow-Axis collimation. Produced by laser-machining/polishing, it provides 0.9mm focal length, 200μm pitch Slow-Axis collimation on the same surface that corrects fast-Axis errors. Custom fabrication enables fill-factor optimization for the 49 single-mode beams and gives parallel collimation with rms pointing errors of 3% and 6% of the far-field divergence for the fast- and Slow-Axis array respectively. Sub-micron pitch mismatch between the Slow-Axis lens and emitter arrays, and beam pointing changes by thermal expansion of the laser bar are detected.
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Low-loss wavelength locking of a 49-element single mode diode laser bar with phase-plate beam correction
CLEO Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, 2009Co-Authors: Natalia Trela, Roy Mcbride, Howard J. Baker, Denis R. HallAbstract:In previous work on laser diode optics, we have used laser-written phase-plates to correct the fabrication and fast-Axis collimation errors of diode laser bars and produce a restoration of brightness of up to a factor of 10. Recently, we extended the technique to provide both fast-Axis correction and Slow-Axis collimation in a single element, applied to an array of 10 tapered emitters with a 100µm pitch [1]. Here we report the use of dual-Axis correction for a full-length diode bar from Bookham, with 49 single mode emitters and 30W cw output at 975 nm. Fast-Axis smile and lens error correction is combined with laser-cut Slow Axis collimation to give highly parallel beams with far-field divergence of 2.6mrad (fast Axis) and 13mrad (Slow-Axis). Fig 1 shows the improvement in fast-Axis divergence, in the form of far-field pattern vs. emitter number.
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High-power, low-divergence, linear array of quasi-diffraction-limited beams supplied by tapered diodes
Applied optics, 2007Co-Authors: Gilbert L. Bourdet, Roy Mcbride, Howard J. Baker, Imen Hassiaoui, J. F. Monjardin, Nicolas Michel, Michel KrakowskiAbstract:We describe for the first time to our knowledge the performance for a linear array of tapered laser diodes with both fast- and Slow-Axis collimation using a microlens for fast-Axis collimation and a laser-written phase plate for Slow-Axis collimation and correction of the residual fast-Axis errors from lens aberrations, thermal lensing, astigmatism, pointing errors, and other wavefront distortions. The phase plate leads to M2 factor reductions of 1.5 for the lensed array following the fast Axis and 2.6 for the whole bar following the Slow Axis.