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Towards dual frequency comb VECSELs with DMD laser-ablated spatial mode masks

Towards dual frequency comb VECSELs with DMD laser-ablated spatial mode masks
Towards dual frequency comb VECSELs with DMD laser-ablated spatial mode masks
Dual frequency comb generation is a field which has seen considerable interest in recent years, with notable implementations such as dual wavelength operation of a Mode-locked Integrated External-cavity Surface Emitting Laser (MIXSEL), CW pumping of orthogonal polarisation states in a microring resonator, and optical phase-locking of discrete frequency combs. Dual frequency operation of CW Vertical External Cavity Surface Emitting Lasers (VECSEL) has been demonstrated in a particularly well controlled way using sub-wavelength metallic masks fabricated onto the surface of the laser gain structure. We present a variation of this technique in which patterned loss masks are machined onto a VECSEL cavity mirror using a Digital Micromirror Device (DMD)-enabled femtosecond-laser ablation system, where the DMD is used as an intensity spatial light modulator. Interaction of the loss mask with the laser mode area results in the VECSEL oscillating preferentially on the spatial modes that observe the least loss within the aperture, and modulation of pump power enables control of the oscillating mode frequency separation. We describe the characteristics of the masks and the properties of the laser operation as progress towards eventual pulsed emission. Our technique has the advantages of discrete gain and Semiconductor Saturable Absorber Mirror (SESAM) structures, very fast fabrication times and the ability to fabricate multiple apertures on a single mirror.
Woods, Jonathan
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Heath, Daniel
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Daykin, Jake
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Chen Sverre, Theo
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Mills, Benjamin
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Sagnes, Isabelle
bb16af9e-cc72-4d08-954b-3c890e00e583
Garnache, Arnaud
8984505f-997a-4132-aee4-ccecd50ad9ba
Tropper, Anne
f3505426-e0d5-4e91-aed3-aecdb44b393c
Apostolopoulos, Vasileios
8a898740-4c71-4040-a577-9b9d70530b4d
Woods, Jonathan
469cd675-1074-4b44-a0d4-b72a4915fa36
Heath, Daniel
d53c269d-90d2-41e6-aa63-a03f8f014d21
Daykin, Jake
b4f0ff0b-f722-4b93-8aff-c2d9b5934c7a
Chen Sverre, Theo
f515a9e9-da44-4af8-b444-8e1daa93222d
Mills, Benjamin
05f1886e-96ef-420f-b856-4115f4ab36d0
Sagnes, Isabelle
bb16af9e-cc72-4d08-954b-3c890e00e583
Garnache, Arnaud
8984505f-997a-4132-aee4-ccecd50ad9ba
Tropper, Anne
f3505426-e0d5-4e91-aed3-aecdb44b393c
Apostolopoulos, Vasileios
8a898740-4c71-4040-a577-9b9d70530b4d

Woods, Jonathan, Heath, Daniel, Daykin, Jake, Chen Sverre, Theo, Mills, Benjamin, Sagnes, Isabelle, Garnache, Arnaud, Tropper, Anne and Apostolopoulos, Vasileios (2019) Towards dual frequency comb VECSELs with DMD laser-ablated spatial mode masks. SPIE Photonics West, San Fransisco, United States. 01 - 06 Feb 2019. (doi:10.1117/12.2508680).

Record type: Conference or Workshop Item (Paper)

Abstract

Dual frequency comb generation is a field which has seen considerable interest in recent years, with notable implementations such as dual wavelength operation of a Mode-locked Integrated External-cavity Surface Emitting Laser (MIXSEL), CW pumping of orthogonal polarisation states in a microring resonator, and optical phase-locking of discrete frequency combs. Dual frequency operation of CW Vertical External Cavity Surface Emitting Lasers (VECSEL) has been demonstrated in a particularly well controlled way using sub-wavelength metallic masks fabricated onto the surface of the laser gain structure. We present a variation of this technique in which patterned loss masks are machined onto a VECSEL cavity mirror using a Digital Micromirror Device (DMD)-enabled femtosecond-laser ablation system, where the DMD is used as an intensity spatial light modulator. Interaction of the loss mask with the laser mode area results in the VECSEL oscillating preferentially on the spatial modes that observe the least loss within the aperture, and modulation of pump power enables control of the oscillating mode frequency separation. We describe the characteristics of the masks and the properties of the laser operation as progress towards eventual pulsed emission. Our technique has the advantages of discrete gain and Semiconductor Saturable Absorber Mirror (SESAM) structures, very fast fabrication times and the ability to fabricate multiple apertures on a single mirror.

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More information

Published date: 4 March 2019
Venue - Dates: SPIE Photonics West, San Fransisco, United States, 2019-02-01 - 2019-02-06

Identifiers

Local EPrints ID: 430215
URI: https://eprints.soton.ac.uk/id/eprint/430215
PURE UUID: 1e5aea2c-05d4-4f49-bfa5-33c167ad937e
ORCID for Benjamin Mills: ORCID iD orcid.org/0000-0002-1784-1012
ORCID for Vasileios Apostolopoulos: ORCID iD orcid.org/0000-0003-3733-2191

Catalogue record

Date deposited: 16 Apr 2019 16:30
Last modified: 17 Sep 2019 00:49

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