Key enabling technologies for compact high repetition rate Petawatt laser systems based on Titanium Sapphire amplifiers V.Moro, S.Branly, O.Casagrande, S.Laux, C.Radier, C. Simon-Boisson. Outline. Overview Contrast ratio Pump lasers Ti:Sa amplifiers design (ASE-parasitics & thermal)
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Key enabling technologies for compact high repetition rate Petawatt laser systems based on Titanium Sapphire amplifiersV.Moro, S.Branly, O.Casagrande, S.Laux, C.Radier, C. Simon-Boisson
THALES Optronique ICUIL 2010, Watkins Glen
Commercial products Petawatt laser systems based on Titanium Sapphire amplifiers
Laboratory resultsOverview - Evolution of TW/PW Class Lasers
More than 200 Ti:Sa CPA systems installed in the world since 1992
1.3 PW – LBNL
1 PW – UNL
850 TW @ 28 J – JAEA
150 TW – UNL
100 TW @ 24 fs – LOA
25 TW – CRIEPI
15 TW – Tokyo U.
45 TW @ 1022 W/cm² – CUOS
10 TW – CEA
1 TW – KEK
(4 x ATLAS+ @ 25 J per laser).
BELLA Laser @ LBNL
THALES DSL Laser : ALPHA 1/XS 1.3 PW
⇒ ASE level was only ~ 108 : 1.
Following this thesis, THALES has developed a commercial product (2 crystals version in vacuum) which is now installed in several places : OSU, Texas University,…
Contrast Ratio better than 1011:1 demonstrated at 45 TW output (instrument-limited measurement)
CR of 1011:1 to 1012:1 are achievable with an optimised 2-crystals XPW
Depointing < 50 µrad
(over 55000 measures)
Beam profile @ 14J in the green @ 1 Hz
Long term stability over 3 hours @ 1 Hz and 15 J @ 532 nm
Beam profile after 2.5m of propagation with 23mm diameter. Petawatt laser systems based on Titanium Sapphire amplifiers
Beam profile after 18m of propagation with 75mm diameter.
Beam profile after 1.5m of propagation with 23mm diameter.
Beam profile after 9m of propagation with 75mm diameter.
Beam profile after 0.5m of propagation with 23mm diameter.
Beam profile after ~3m of propagation with 75mm diameter.Pump lasers – GAIA HP propagation
The GAIA-R HP exhibits a very constant beam profile along propagation and does not require any image relay (no vacuum tube).
mechanical mount for the crystal while keeping
an adequate thermal management of the crystal
(confirmed by FEM modelling)
Beam shaping Petawatt laser systems based on Titanium Sapphire amplifiers
FiltersASE & Transverse lasing - Experimental setup
Fluorescence Petawatt laser systems based on Titanium Sapphire amplifiers
Higher pump fluence possible if asynchronous pumping is implemented
Pump Fluence (J/cm²)ASE & Transverse lasing - experimental results
Ongoing R&D for scalability to higher rep rates.