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Business Development Manager, Bucarest 2011

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1 Business Development Manager, Bucarest 2011
Industrial approach and identifications of risks for multi-PW laser systems Franck FALCOZ Business Development Manager, Bucarest 2011 LM3 micro-machinning station with s-Pulse HP

2 Questions to be considered..
How to qualify a High Energy Femtosecond laser, and how to verify the performances of the laser chain? (large beam, ultrashort pulse durations, compression in vacuum, low rep rate…) What are the criteria for a supplier of a Ultra Intense Laser chain for proposing the right laser architecture : performances, reliability, upgradeability, man-machine interface….? Management of the risks : quality control of critical components (crystal, gratings…), stock of spare in case of failure… 2

3 Specificities in PW laser projects…
Management of Risks… Specificities in PW laser projects… Project duration and PLM « Project/Product Lifecycle Management »: multi years program: project preparation, realization of the building with radioprotected zone welcoming the PW laser, commissioning of the facility: total duration could be longer than 5 years Important to structure the proposal in multi-steps approach ensuring at each step that the user will have an useable machine with « state-of-the art » performances…

4 Specificities in PW laser projects…
Management of Risks… Specificities in PW laser projects… PW laser chain budgetary structure Laser chain is shared in 2 main parts: The « femtosecond laser part », technology and techniques involved in the chain The « pump lasers » part Each of them represents around 50% of the whole budget… Femtosecond part: Combination of Technologies, Technique and Engineering… Pump part: « tank of Green light” for pumping crystals… Key components for the reliability Risks of failure in PW laser development are definitely in the femtosecond part… 4

5 Reliability: « champion data » & « Comfort Zone »
Performances… « Femtosecond part »: Reliability: « champion data » & « Comfort Zone » How far are the warranted performances from the « limits » : safety margin (level of pumping, extraction of the amplifiers, compressor efficiency ..) How high is the stress applied on optical components versus Damage Threshold: Fluence: 1J/cm²/face on Ti:Sapphire crystal Intensity on gratings : <100 mJ/ cm² 5

6 Pulse duration…: ultra short (<25fs) Contrast ratio…: ns, ps, ASE
Performances… « Femtosecond part »: In a PW laser chain we have to deal with challenging performances like : Pulse duration…: ultra short (<25fs) Contrast ratio…: ns, ps, ASE Energy…: parasitic lasing Strehl ratio: intensity Stability: shot to shot, long term, pulse duration, pointing… 6

7 Gain narrowing control
Our solution to warranty an ultrashort pulse duration on the long term :Acousto-Optic Programmable Gain Control Filter (Mazzler) Ti:Sa Pockels cell Spectral filter Acousto-Optic Programmable Gain Control Filter (AOPGCF) acoustic wave non-diffracted beam diffracted beam Mazzler Regenerative amplifier M.P. amplifier 1 M.P. amplifier 2 M.P. amplifier N Mazzler Spectrometer 7

8 Gain narrowing control
85 nm 30nm 8

9 Contrast ratio Contrast ratio
The optimum contrast ratio (ASE, ns = replica, ps) is obtained through a combination of techniques. Laser architecture: design of the amplifier chain Keeping the pulse spectrum as large as possible (Mazzler) Cleaning Techniques (mJ level). Double CPA configuration Commercial product: SEQUOIA 9

10 Measurement performed with a modified SEQUOIA (10^15 noise level)
Contrast ratio double CPA Contrast Characterization SUPERBOOSTER 10^14 ASE contrast Patented front-end SA + XPW Detection limit Measurement performed with a modified SEQUOIA (10^15 noise level) 10

11 Transverse lasing Numerical simulation for twin amplifier configuration: Pump energy : 80 J / Crystal Diameter crystal : 12 cm Crystal length : 3 cm Absorption : 90% 11

12 Double amplifier "standard"
Transverse lasing Comparison of different amplifier configurations : Pump energy Pump density Transverse Gain Single amplifier 160 J 2 J/cm2 400 Double amplifier "standard" ampli 1 100 ampli 2 200 Double amplifier “Amplitude Technologies” (patented) 1,6 J/cm2 40 12

13 The pump lasers…the « black box-turn key » part in a PW laser chain…
… must supply green ressources in reliable and cost effective conditions (« ownership cost ») 13

14 Pump lasers… Our approach for the pumping of the last amplifier is to keep always a large number of pumps to take advantages of the multiplexing : beam smoothing and improvement of the stability. We consider that 10 pump lasers for pumping one crystal is « comfortable » In case of failure of one pump laser the reduction of the laser performances is less than 5%… 14

15 Energy stability : Pump lasers mixing
Measurement of energy over 500 shots. Input energy stability: 1,9 % RMS Input energy: mJ For N=8 : Total pump energy: 15 Joules Output energy stability: 0,78% RMS Output energy : 5,2 Joules Experimental results

16 Amplitude Technologies Nd:YAG lasers
Pump lasers… Amplitude Technologies Nd:YAG lasers TITAN series (up to 5Hz) for the PW laser systems - Propulse series (up to for the 100 TW- systems Amplitude Technologies Nd: YAG laser are all based on the same design. The TITAN series is an upgrades of the PROPULSE series to satisfy the need of PW-class amplifiers

17 Our performances in pump lasers
Highest wall-plug efficiency >1.5%: only 12 flashs for > 10 J 532 nm Lowest price per Joule in the Green High reliability (>40Mshots before flashlamp replacement) Excellent shot to shot stability (<0,9% RMS 5 Hz, <1,1% rms single shot operation) Accumulated experience (>100 multi Joule lasers produced and delivered)

18 Beam Quality 1%RMS

19 Pulse to Pulse Stability
Pump lasers… Pulse to Pulse Stability 1%RMS Stability energy over 9 hours – 5Hz shots measured. -0,9% RMS 19

20 Conclusion… The key points in Amplitude approach to high energy system are performances and reliability leading to customer’s satisfaction The proposed systems allow a full control of the laser parameters: control for ensuring operation and safety Excellence comes from a good balance between the warranted performances on the short term and the expected performances on the long term High Rep. Rate 100 TW-PW lasers lead to long term partnership between the supplier and the customer… the long term vision of the supplier is a crucial parameter in customer’s decision

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