HALO has published a number of papers in journals and conference proceedings. For rights reasons, the full details may not be published here, but below are links to the appropriate websites:

Journal publications

Post-modelling of images from a laser-induced wavy boiling front
R.S. Mattia, A.F.H. Kaplan
Applied Surface Science 357, p. 2277–2284
http://dx.doi.org/10.1016/j.apsusc.2015.09.226

Measuring the Melt Flow on the Laser Cut Front
Jetro Pocorni Dirk Petring, John Powell, Eckard Deichsel, Alexander F.H. Kaplan
Physics Procedia 78, p. 99–109 (2015)
http://dx.doi.org/10.1016/j.phpro.2015.11.022

Analyzing and Post-modelling the High Speed Images of a Wavy Laser Induced Boiling Front
R.S. Mattia, A.F.H. Kaplan
Physics Procedia 78, p. 192-201 (2015)
http://dx.doi.org/10.1016/j.phpro.2015.11.043

Absorption peaks depending on topology of the keyhole front and wavelength
Alexander F.H. Kaplan and Ramiz S. Matti
J. Laser Applications 27, p. S29012 (2015).
http://dx.doi.org/10.2351/1.4906469

Local flashing events at the keyhole front in laser welding
Alexander F.H. Kaplan
Optics and Lasers in Engineering 68, p. 35–41 (2015).
http://dx.doi.org/10.1016/j.optlaseng.2014.12.019

The Effect of Laser Type and Power on the Efficiency of Industrial Cutting of Mild and Stainless Steels
Jetro Pocorni, Dirk Petring, John Powell, Eckard Deichsel and Alexander F. H. Kaplan
J. Manuf. Sci. Eng 138, p. 031012 (2015).
http://dx.doi.org/10.1115/1.4031190

Sensitivity Analysis of Laser Cutting Based on Metamodeling Approach
Toufik Al Khawli, Urs Eppelt and Wolfgang Schulz
Handbook of Research on Computational Simulation and Modeling in Engineering, ch. 20, p. 618-639 (2015).
http://dx.doi.org/10.4018/978-1-4666-8823-0.ch020

Meta-Modelling Techniques Towards Virtual Production Intelligence 
Wolfgang Schulz , Toufik Al Khawli
Advances in Production Technology; part of the series “Lecture Notes in Production Engineering” p. 69-84 (2014).
http://dx.doi.org/10.1007/978-3-319-12304-2_6

Analysis of moving surface structures at a laser-induced boiling front
R.S. Matti and A.F.H. Kaplan
Applied Surface Science 317 p. 560-567 (2014)
http://dx.doi.org/10.1016/j.apsusc.2014.08.190

Cladding-pumped ytterbium-doped fiber laser with radially polarized output
Di Lin, J. M. O. Daniel, M. Gecevičius, M. Beresna, P. G. Kazansky, and W. A. Clarkson
Optics Letters, 39, p. 5359-5361 (2014).
http://dx.doi.org/10.1364/OL.39.005359

Controlling the handedness of directly excited Laguerre–Gaussian modes in a solid-state laser
Di Lin, J. M. O. Daniel, and W. A. Clarkson
Optics Letters 39, p. 3903-3906 (2014).
http://dx.doi.org/10.1364/OL.39.003903

Analysis of laser remote fusion cutting based on a mathematical model
R. S. Matti, T. Ilar and A. F. H. Kaplan
J. Appl. Phys. 114, p. 233107 (2013).
http://dx.doi.org/10.1063/1.4849895

Rapid, electronically controllable transverse mode selection in a multimode fiber laser
J. M. O. Daniel and W. A. Clarkson
Optics Express 21, p. 29442-29448 (2013).
http://dx.doi.org/10.1364/OE.21.029442

Conference papers and posters

Photonics West 2016
14-18 Feb-2016 San Francisco, USA
Ultrafast laser ablation of transparent materials
Lara Bauer ; Simone Russ ; Myriam Kaiser ; Malte Kumkar ; Birgit Faißt ; Rudolf Weber ; Thomas Graf
Proc. SPIE 9735, 97350X
http://dx.doi.org/10.1117/12.2212449

Donut beam generation in a hybrid fiber laser pumped Ho:YAG laser
A. C. Butler, P. C. Shardlow, R. T. Uren, W. A. Clarkson
Paper 9726-61

Mittweider Lasertagung 2015
19-20 Nov-2015 Mittweida, Germany
Meta-Modelling and Visualization of multi-dimensional Data
Wolfgang Schultz

OSA Advanced Solid-State Lasers Conference
04-09 Oct-2015; Berlin, Germany
Cladding-pumped radially-polarized fiber Lasers
W. A. Clarkson, D. Lin, , M. Beresna, P. G. Kazansky, P. Shardlow
Paper AW2A.4 (Invited Paper)
http://dx.doi.org/10.1364/ASSL.2015.AW2A.4

ICNAAM 2015
13th International Conference of Numerical Analysis and Applied Mathematics
23-29 Sep-2015; Rhodes, Greece
An integrated approach for the knowledge extraction in computer simulation models with a multidimensional parameter space
Wolfgang Schulz

NOLAMP 15
15th Nordic Laser Materials Processing Conference
25-28 Aug-2015; Lappeenranta, Finland.
Measuring the Melt Flow on the Laser Cut Front
Jetro Pocorni, Dirk Petring, John Powell, Eckard Deichsel, Alexander F.H. Kaplan

Analyzing and Post-modelling the High Speed Images of a Wavy Laser Induced Boiling Front
R.S. Mattia, A.F.H. Kaplan
[Proceedings published in Physics Procedia 78; see above.]

LiM 2015
Laser in Manufacturing 2015
25-29 Jun-2015; Munich, Germany

Influence of pulse duration on the glass cutting process
L. Bauer, U. Keller, S. Russ, M. Kumkar, B. Faißt, R. Weber, T. Graf
Session Tu_A32_3; Paper 5

Basic imaging and modelling analysis of the processing front in laser remote fusion cutting
Ramiz .S. Matti, Alexander F.H. Kaplan
Session We_A31_2; Paper 4

CLEO Europe 2015
Conference on Lasers and Electro-optics 2015
21-25 Jun-2015; Munich, Germany
Simple Technique for High-Order Ring-Mode Selection within Solid-State Lasers
A. C. Butler, R. Uren, D. Lin, J. R. Hayes, and W. A. Clarkson
Paper CA 7-5.

Tm-doped fibre laser with radially-polarized output beam at 2µm
D. Lin, P. Shardlow, M. Beresna, P. G. Kazansky, and W. A. Clarkson
Paper CJ P-10.

High Power Spectrally-Tailorable Thulium-Doped Fibre Amplified Spontaneous Emission Source
A. Billaud, P. C. Shardlow, A. Butler, D. Jain, J. Sahu, and W. A. Clarkson
Paper CJ P-30.

CLEO 2015
Conference on Lasers and Electro-Optics 2015
10-15 May-2015; San Jose, USA
Cladding-pumped Yb-doped fiber laser with vortex output beam
D. Lin, W. A. Clarkson
http://dx.doi.org/10.1364/CLEO_SI.2015.STh4L.1

ICALEO 2014
International Congress on Applications of Lasers & Electro-Optics 2014
19-23 Oct-2014; San Diego, USA
Differences in Cutting Efficiency Between CO2 and Fiber Lasers when Cutting Mild and Stainless Steels
Jetro Pocorni, Dirk Petring, John Powell, Eckard Deichsel, Alexander F.H. Kaplan.
ISBN: 9781940168029 (905)

Laser Microjet© Cutting of up to 3 mm Thick Sapphire
Bernold Richerzhagen, Yury Kuzminykh, Patrik Hoffmann, Annika Richmann.
ISBN: 9781940168029 (P148)

Absorption peaks depending on topology of the keyhole and wavelength
Alexander F.H. Kaplan and Ramiz S. Matti
[Journal version also published in J. Laser Applications 27, p. S29012 (2015). See above.]

ICNAAM 2014 
12th International Conference of Numerical Analysis and Applied Mathematics
22-28 Sep-2014; Rhodes, Greece
Metamodeling of Laser Cutting
U. Eppelt & T. Al-Khawli
AIP Conf. Proc. 1648, 01000
http://dx.doi.org/10.1063/1.4912302

EuroPhoton 2014
6th EPS-QEOD Europhoton Conference
24-29 Aug-2014; Neuchatel, Switzerland
Efficient conversion to radial polarization in the two-micron band using a continuously space-variant half-waveplate
Lin, Di , Shardlow, P., Beresna, M., Kazansky, P.G. and Clarkson, W.A.

High power radially-polarized Yb-doped fiber laser
Lin, Di , Daniel, J., Gecevičius, M., Beresna, M., Kazansky, P.G. and Clarkson, W.A.

67th IIW Annual Assembly
13-18 Jul-2014; Seoul, South Korea
Interaction of the beam with the wavy keyhole front in laser welding
A.F.H. Kaplan
CONF-2014-84

Stuttgart Laser Technology Forum 2014 (SLT14)
25-Jun-2014; Stuttgart, Germany
Simulation of Glass Cutting (Invited Talk)
W. Schulz (Fraunhofer ILT)

Analysing the influence of pulse duration on the glass cutting process
L. Bauer (TRUMPF Laser)

Optical Fabrication and Testing
22-26 Jun-2014; Hawaii, USA
Segmented Waveplate Polarisation Control for Laser Cutting
Peter E. MacKay, Tobias Häcker, and Tim Hesse
http://dx.doi.org/10.1364/OFT.2014.OTh4B.2

CLEO 2014
Conference on Lasers and Electro-Optics 2014
08-13 Jun-2014; San Jose, USA
Direct generation of radially-polarized output from an Yb-doped fiber laser
D. Lin, J. M. O. Daniel, M. Gecevičius, M. Beresna, P. G. Kazansky, W. A. Clarkson
CLEO: 2014, OSA Technical Digest, paper JW2A.22
http://dx.doi.org/10.1364/CLEO_AT.2014.JW2A.22

Photonics West 2014
04-06 Feb-2014; San Francisco, USA
Comparison of different processes for separation of glass and crystals using ultrashort pulsed lasers
M. Kumkar, L. Bauer, S. Russ et al.
Proc. SPIE 8972, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XIV, p. 897214 (2014).
http://dx.doi.org/10.1117/12.2044187

NOLAMP 14
14th Nordic Laser Materials Processing Conference
26-28 Aug-2013; Gothenburg, Sweden
Measuring the State-of-the-Art in Laser Cut Quality
Jetro Pocorni ; John Powell ; Torbjörn Ilar ; A. Schwarz ; Alexander Kaplan

Modelling the cutting geometry for laser remote fusion cutting of metals
Ramiz Matti ; Torbjörn Ilar ; Alexander Kaplan

CLEO EUROPE/IQEC 2013 
12-16 May-2013; Munich, Germany
Controlling the handedness of directly excited Laguerre Gaussian modes in a solid-state laser 
Lin, D. ; Daniel, J.M.O. ; Clarkson, W.A.
http://dx.doi.org/10.1109/CLEOE-IQEC.2013.6800599

Photonics West 2013
02-07 Feb-2013; San Francisco, USA
Picosecond laser ablation on transparent materials
Simone Russ ; Christof Siebert ; Urs Eppelt ; Claudia Hartmann ; Birgit Faißt ; Wolfgang Schulz
Proc. SPIE Vol. 8608, Laser-based Micro- and Nanopackaging and Assembly VII, p. 86080E (2013).
http://dx.doi.org/10.1117/12.2001991

Single-frequency Nd:YAG laser with LG01 donut mode output
Di Lin, J.M.O.Daniel, W.A.Clarkson
Solid State Lasers XXII: Technology and Devices; 8599–51 (2013).