McBrearty, E.

Paul, D.J.

Saeed, A.

Sorel, M.

English

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Narrow Linewidth DFB Lasers for Cold Atom Technologies
E. McBrearty, A. Saeed, M. Sorel & D.J. Paul,
School of Engineering, University of Glasgow
http://userweb.eng.gla.ac.uk/douglas.paul/index.html
Contact: Douglas.Paul@glasgow.ac.uk
http://www.jwnc.gla.ac.uk
Tel: +44 141 330 5219
0 800700600500400300200100
0.000
0.002
–0.002
–0.004
–0.006 Matt Aldous,University of Southampton
Detuning (a.u.)
Si
gn
al
 (V
)
87Rb F = 1 –> F’
87Rb F = 2 –> F’
87Rb F = 3 –> F’
87Rb F = 2 –> F’
0
10
20
30
40
50
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0 20 40 60 80 100 120 140 160
Po
w
er
 (m
W
) Voltage (V)
Current (mA)
779.0 779.5 780.0 780.5 781.0 781.5 782.0
-70
-60
-50
-40
-30
-20
-10
In
te
ns
ity
 (d
B
m
)
Wavelength (nm)
780.24 nm
40 dB SMSR from 1mm laser
779.6 779.8 780.0 780.2 780.4 780.6 780.8 781.0
-70
-60
-50
-40
-30
-20
-10
In
te
ns
ity
 (d
B
m
)
Wavelength (nm)
47.7 dB
780.24nm
2mm laser shows high SMSR
779.0 779.5 780.0 780.5 781.0 781.5 782.0
-80
-70
-60
-50
-40
-30
-20
-10
Po
w
er
 (d
B
m
)
Wavelength (nm)
I = 45mA
I = 50mA
I = 55mA
I = 60mA
I = 65mA
I = 70mA
DFB demonstration
E-Beam Lithography
ICP Etch & PECVD 
Metallisation
Processed 
Laser Bars
DFB 3rd Order Grating
4" Wafer
Devices fabricated in the James Watt Nanofabrication Centre
New epitaxial design to double DFB power & Increase fibre coupling 
efficiency. Linewidth will also decrease. AOMs and SOAs to be 
integrated with DFBs.
Innovate UK DIFFRACT: Integrated DFB Lasers for Cold Atom 
Technologies, M Squared Lasers, KNT, Optocap, Universities of 
Birmingham & Glasgow
Innovate UK PROPEL: Power Scaled DFB Lasers for Portable 
Spectroscopy, M Squared Lasers, KNT, Optocap, University of Glasgow
Innovate UK CoolBlue: Quantum Cooling using Mode Controlled Blue 
Lasers, CSTG, Universities of Aston & Glasgow
Innovate UK gMOT: Scalable Manufacture & Evaluation of Miniature 
Cold Atom Traps, KNT, TMD, Universities of Glasgow & Strathclyde
Material
Growth Fabrication
Facet
Coatings
Packaging
Electronics
& Laser Systems
GU DFB used for 
spectroscopy of Rh
Initial linewidth test for 
1 mm DFB: 10 MHz over 10 µs
New epitaxial design should 
realise linewidth << 1 MHz
Background and Aim Fabrication of DFB Lasers at 780.24 nm
UK QT Hub for Sensors & Metrology partnership project
for end user demonstration activies
Aim to deliver fibre-coupled DFB lasers for cooling & repump
packaged in telecoms packages for low cost
Rb D2 Line requires lasers at λ= 780.24nm
with ≤ 1MHz for cooling
Packaged, fibre coupled DFB lasers delivered to the
Universities of Birmingham, Nottingham, Southampton,
Strathclyde & Sussex
Full UK supply chain exercised for Sovereign Capability
87
DFB Laser Performance Packaging & Spectroscopy
Supply Chain Future Work & Follow on Funding


Narrow Linewidth DFB Lasers for Cold Atom Technologies

http://eprints.gla.ac.uk/197577/1/197577.pdf

Narrow Linewidth DFB Lasers for Cold Atom Technologies

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