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Diode-bar-pumped planar waveguide lasers

Diode-bar-pumped planar waveguide lasers
Diode-bar-pumped planar waveguide lasers
Diode-bar lasers have been used with great success to pump high power solid state lasers in numerous different geometries; nevertheless it remains a challenge to use the highly asymmetric diode-bar output efficiently. We describe an approach to this problem in which the solid-state gain medium is fabricated as a planar waveguide, into which the high-aspect-ratio emission from the diode-bar can be coupled using a simple optical system. This is a geometry which should in principle handle heat dissipation well. We have investigated the performance of a planar Nd-doped YAG waveguide pumped by a 20W 807nm diode-bar. A high-quality, low propagation loss guide is essential for such a device; in this experiment we used a liquid-phase-epitaxy-grown structure. The 5mm long waveguide had an 80µm-thick 1.5 at.% Nd:YAG core sandwiched between substrate and protective cladding layer of undoped YAG. The Nd content of the core raised its refractive index by 4.8×10-4 relative to substrate and cladding, creating an optical waveguide with a numerical aperture of 0.06. Pump radiation from the diode-bar was coupled into the waveguide using a cylindrical lens system which produced a line focus at the input face of the waveguide with measured beam radii of 10µm and ~1mm along the guided and non-guided axes respectively. A monolithic laser cavity was formed by dielectric coatings applied to the plane-parallel end-faces of the waveguide.
0-7803-4947-4
115-116
Tropper, A.C.
f3505426-e0d5-4e91-aed3-aecdb44b393c
Bonner, C.L.
96e1b86d-6161-469a-b090-9aacf1e96c98
Brown, C.T.A.
7a30f6bb-ac13-457c-9c14-c6bbc12156c4
Shepherd, D.P.
9fdd51c4-39d6-41b3-9021-4c033c2f4ead
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2
Hanna, D.C.
3da5a5b4-71c2-4441-bb67-21f0d28a187d
Tropper, A.C.
f3505426-e0d5-4e91-aed3-aecdb44b393c
Bonner, C.L.
96e1b86d-6161-469a-b090-9aacf1e96c98
Brown, C.T.A.
7a30f6bb-ac13-457c-9c14-c6bbc12156c4
Shepherd, D.P.
9fdd51c4-39d6-41b3-9021-4c033c2f4ead
Clarkson, W.A.
3b060f63-a303-4fa5-ad50-95f166df1ba2
Hanna, D.C.
3da5a5b4-71c2-4441-bb67-21f0d28a187d

Tropper, A.C., Bonner, C.L., Brown, C.T.A., Shepherd, D.P., Clarkson, W.A. and Hanna, D.C. (1998) Diode-bar-pumped planar waveguide lasers. Lasers and Electro-Optics Society Annual Meeting (LEOS '98), United States. 01 - 04 Dec 1998. pp. 115-116 . (doi:10.1109/LEOS.1998.737760).

Record type: Conference or Workshop Item (Paper)

Abstract

Diode-bar lasers have been used with great success to pump high power solid state lasers in numerous different geometries; nevertheless it remains a challenge to use the highly asymmetric diode-bar output efficiently. We describe an approach to this problem in which the solid-state gain medium is fabricated as a planar waveguide, into which the high-aspect-ratio emission from the diode-bar can be coupled using a simple optical system. This is a geometry which should in principle handle heat dissipation well. We have investigated the performance of a planar Nd-doped YAG waveguide pumped by a 20W 807nm diode-bar. A high-quality, low propagation loss guide is essential for such a device; in this experiment we used a liquid-phase-epitaxy-grown structure. The 5mm long waveguide had an 80µm-thick 1.5 at.% Nd:YAG core sandwiched between substrate and protective cladding layer of undoped YAG. The Nd content of the core raised its refractive index by 4.8×10-4 relative to substrate and cladding, creating an optical waveguide with a numerical aperture of 0.06. Pump radiation from the diode-bar was coupled into the waveguide using a cylindrical lens system which produced a line focus at the input face of the waveguide with measured beam radii of 10µm and ~1mm along the guided and non-guided axes respectively. A monolithic laser cavity was formed by dielectric coatings applied to the plane-parallel end-faces of the waveguide.

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More information

e-pub ahead of print date: 1998
Venue - Dates: Lasers and Electro-Optics Society Annual Meeting (LEOS '98), United States, 1998-12-01 - 1998-12-04
Organisations: Optoelectronics Research Centre, Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 76610
URI: https://eprints.soton.ac.uk/id/eprint/76610
ISBN: 0-7803-4947-4
PURE UUID: 8abee4a9-f98a-4ebe-a556-09be2abd4905
ORCID for D.P. Shepherd: ORCID iD orcid.org/0000-0002-4561-8184

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Date deposited: 11 Mar 2010
Last modified: 20 Jul 2019 01:25

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Contributors

Author: A.C. Tropper
Author: C.L. Bonner
Author: C.T.A. Brown
Author: D.P. Shepherd ORCID iD
Author: W.A. Clarkson
Author: D.C. Hanna

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