High power fiber lasers emitting at High power fiber lasers emitting at 1030 nm and 976 nm 1030 nm and 976 nm E. Cormier E. Cormier CELIA Universit CELIA Universit é é Bordeaux I Bordeaux I - - CNRS CNRS - - CEA, CEA, 351 cours de la Lib 351 cours de la Lib é é ration F ration F - - 33405 Talence, France 33405 Talence, France
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High power fiber lasers emitting at High power fiber lasers emitting at 1030 nm and 976 nm1030 nm and 976 nm
351 cours de la Lib351 cours de la Libéération Fration F--33405 Talence, France33405 Talence, France
E. Cormier CMDO 2010E. Cormier CMDO 2010
1. Introduction
2. Fiber lasers at 1030 nmn
Sub 300 fs: Fiber CPA
Sub 100 fs: Direct amplification
Sub 10 fs: Few cycles with OPCPA
3. Fiber lasers at 976 nm
Main issues
High power : CW laser
High energy: Q-switch
High peak power: Mode-lock systems
Blue Light
High brightness pumping of Yb-doped materials
OutlineOutline
22
E. Cormier CMDO 2010E. Cormier CMDO 2010
1. Introduction
2. Fiber lasers at 1030 nmn
Sub 300 fs: Fiber CPA
Sub 100 fs: Direct amplification
Sub 10 fs: Few cycles with OPCPA
3. Fiber lasers at 976 nm
Main issues
High power : CW laser
High energy: Q-switch
High peak power: Mode-lock systems
Blue Light
High brightness pumping of Yb-doped materials
OutlineOutline
33
E. Cormier CMDO 2010E. Cormier CMDO 2010
• Large amplification bandwidth• Limited thermo-optical problems• Excellent beam quality• Efficient diode pumping operation• High single pass gain• Large variety of doping ions• Compactness
A revolution in laser technology: fiber lasers A revolution in laser technology: fiber lasers
J. Nillon, et al, CLEO 2009 [CWL3] Baltimore USAJ. Nillon, et al, ASSP 2009, [Post Deadline], Denver USA2424
FCPA pumped OPCPA : sub 10 fs
Δλ = 68 nm
E. Cormier CMDO 2010E. Cormier CMDO 2010
1. Introduction
2. Fiber lasers at 1030 nmn
Sub 300 fs: Fiber CPA
Sub 100 fs: Direct amplification
Sub 10 fs: Few cycles with OPCPA
3. Fiber lasers at 976 nm
Main issues
High power : CW laser
High energy: Q-switch
High peak power: Mode-lock systems
Blue Light
High brightness pumping of Yb-doped materials
OutlineOutline
2525
E. Cormier CMDO 2010E. Cormier CMDO 2010
2F5/2
2F7/2
λp= 976 nm λs=1030 nm
Yb-doped fiber
Configuration 1
Yb-doped fiber lasers operating at 976 nm
2626
E. Cormier CMDO 2010E. Cormier CMDO 2010
2F5/2
2F7/2
λp= 976 nm λs=1030 nm
Configuration 1
2F5/2
2F7/2
915 nm 1030 nm
Configuration 2
976 nm
Yb-doped fiber Yb-doped fiber
2727
Yb-doped fiber lasers operating at 976 nm
E. Cormier CMDO 2010E. Cormier CMDO 2010
σsabs
σsem
σsem ~σs
abs
Issue # 1 :Transparency:
Bleaching is achieved if :
for a pump intensity of:
%502 ≈+
= ems
abss
abss
Tot
trans
nn
σσσ
2kW/cm30≈
⎟⎟⎠
⎞⎜⎜⎝
⎛−
=
fluoempabs
s
ems
absp
ptransp
hI
τσσ
σσν
σsabs
σsem
Transparency at 1030 nm achieved for inversion ~5% …
2828
Yb-doped fiber lasers operating at 976 nm
E. Cormier CMDO 2010E. Cormier CMDO 2010
Issue #2: Gain competition between quasi and true 3-level laser operation :
βα pGG 72.025.0 9761030 +=
Pump absorption Clad to core area ratio
Rod type U-LMA PCF : 80 / 200 µm
β=6.2 : αp=9 dB => G1030 nm< 50 dB
Φclad=200 µm => Pp ~ several 100W
2929
Yb-doped fiber lasers operating at 976 nm
E. Cormier CMDO 2010E. Cormier CMDO 2010
High power CW laser at 976 nm
Rod type fiber :Rod type fiber :MicrostructuredMicrostructuredDouble clad Yb dopedDouble clad Yb doped8080µµm/200m/200µµmmAbsorption: Absorption: 10 dB/m10 dB/mLength : 1.2 m Length : 1.2 m
1 Pptrans = 11 W
2 β = 6.2, losses = 60 dB Boullet et al., OE 16, 17891 (2008)
50 % compressor efficiency only !! Potentially 37 kW
High peak power mode-lock laser at 976 nm
Lhermite et al., OL 35, 3459 (2010)
E. Cormier CMDO 2010E. Cormier CMDO 20103636
Blue light generation at 488 nm
LBO crystal ωλ/2 λ/4 DM
2ω
High energy fiber laser
59 W @ 977 nm
High energy fiber laser
59 W @ 977 nm
36 % 36 % efficiencyefficiency
16.1 W 16.1 W atat 488 nm488 nm
Boullet et al., Europhoton (2010)
E. Cormier CMDO 2010E. Cormier CMDO 20103737
Blue light generation at 488 nm
Boullet et al., Europhoton (2010)
Applications of high brightness intense sources at 488 nm Replacement of Ar ion lasersLaser surgeryDermatologyBiophotonicsLaser light shows and laser display RGB
E. Cormier CMDO 2010E. Cormier CMDO 20103838
High brightness pumping of Yb-doped materialSingle-mode laser
Multi-mode diode
Single-mode laserMulti-mode diode
Brightness : B =P
S.Ω
E. Cormier CMDO 2010E. Cormier CMDO 20103939
High brightness pumping of Yb-doped material
High brightness optical pumping of Yb materials 900 920 940 960 980 1000 1020 1040 1060 1080
0.0
0.5
1.0
Inte
nsity
[a.u
.]Wavelength [nm]
Yb:Caf2
High power High power fiberfiber laserlaser
High power High power diodediode
Source power [W]
Brig
htne
ss[W
/cm
2 /sr]
E. Cormier CMDO 2010E. Cormier CMDO 20104040
High brightness pumping of Yb-doped material
40 W 40 W
ASE source at 976 nm
TEM00
Up to 40 W
974 976 978 980 9820.0
0.5
1.0
Inte
nsity
[a.u
.]Wavelength [nm]
3 W 15 W 27 W 39 W
E. Cormier CMDO 2010E. Cormier CMDO 20104141
High brightness pumping of Yb-doped material
Small signal gain up to 10 expected with long cristals
Collaborations:HHG group @ CELIAInstitut d’optique (Palaiseau)Institut of physics, Vilnius University, Vilnius, Lithuania (A. Piskargkas)Institut of Applied Physics (IAP), Universität Jena, Germany (J. Limpert)Photonics Institute, Vienna University of Technology, Vienna, Austria (A. Baltuska)ETH, Zurich, Switzerland (U. Keller)KEK, Tsukuba, Japan (T. Omori, J. Urakawa)Clarendon Laboratory, University Oxford, England (A. Wyatt, I. Walmsley)Eolite systems (Bordeaux)Amplitude systèmes (Bordeaux)CEA CESTA4343
C. Aguergaray (Phd)Y. Zaouter (Phd)J. Boullet (Postdoc)