1 / 23

High Power Laser System for Advanced Virgo

High Power Laser System for Advanced Virgo. C.N.Man. Design goals Present technology Other activities in the world Virgo+ and Laser System - possible planning Advanced Virgo HP laser HP related photonics (fibers as MC, modulators,…) All-fibered laser system Conclusion. Design goals .

ella
Download Presentation

High Power Laser System for Advanced Virgo

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. High Power Laser System for Advanced Virgo C.N.Man • Design goals • Present technology • Other activities in the world • Virgo+ and Laser System - possible planning • Advanced Virgo HP laser • HP related photonics (fibers as MC, modulators,…) • All-fibered laser system • Conclusion Frascati 12/01/06

  2. Design goals • Laser power: 200W • Wavelength : 1 mm to 1.6 mm, linked to SiO2 or Si, laser material, optical technology,… • Input Beam propagation: free space, fibre ? • Beam cleaning: resonant MC or fibre MC? • Modulation: • Bulk, or fibre components ? Which frequency(ies) ? Frascati 12/01/06

  3. Present technology : laser designs High power  cooling problem (birefringence induced by thermal loading, …)  large surface/volume ratio and material conductivity  high efficiency Solutions : new crystals, or ceramics disk amplifiers or fibres Today, kW single mode lasers are available with both disks and fibre amplifiers Frascati 12/01/06

  4. Other activites in the world • Laser systems (< kW) • GW groups activities: mainly Germany and Australia • Very high power lasers ( up to MW CW) • Disk lasers for military and industry : Boeing, … • Fibre lasers for welding, cutting (kW`s) • Scientific and telecom lasers (> 100 W) • Disks and fibre lasers, many European small companies • Yb and Er doped Fiber lasers: 1,06 and 1,3 m • Nb: telecom lasers  MTBF > 100 000 h •  Fibre integrated isolators, modulators, etc •  1.3- 1.5 mm wavelength Frascati 12/01/06

  5. Virgo + : First Step in the Studies Virgo+: as master laser, Fiber laser or SSL HP Solid State laser/amplifier (LZH) To start : 1 - investigations on the FL as a potential new Master laser 2 - development of a 50 W laser/amplifier in SS technology Deliverables in 07-08: A Single-Frequency Fiber laser of 2W A laser amplifier to scale up the 20W to 50W Frascati 12/01/06

  6. 20W laser injection locking Fiber laser Master Laser 50W Amplifier PMC Laser System for Virgo + Frascati 12/01/06

  7. Fiber Master Laser for Virgo + 100 mW Oscillator amplified to 2 W at 1.06 m Frascati 12/01/06

  8. Four-stage end-pumped Nd:YVO4 Each stage pumped by 45 W laser diode Each diode indiv temp controlled Each 2diodes connected in series to 1 current driver Diodes current controlled Virgo + : Nd:YVO4 50WAmplifier (LZH) Frascati 12/01/06

  9. Possible Planning for Virgo + Laser System Frascati 12/01/06

  10. Adv. Virgo: HP single-mode fiber lasers Frascati 12/01/06

  11. HP related photonics Beam propagation: free space or through fibre ? Fiber laser : no MC needed SSL: resonant cavity MC or fibre MC? • Modulation: • Bulk, or fibre modulators ? (Which frequency(ies) ?) Frascati 12/01/06

  12. Requirements for mode cleaning • Spatial filtering of modes • Resonant mode close to a gaussian beam • Output beam independent of input beam or ouput phase noise independent of input beam jitter • No addition of any extra noise • Power standing required Why using a fiber: simplicity of the system, its control and its maintenance Frascati 12/01/06

  13. PCF as Input Mode Cleaner Use of monomode fibers not realistic up to now, due to power handling capabilities Photonic Crystal Fiber offers this possibility of power handling What is a PCF ? Frascati 12/01/06

  14. High Index Guiding Fiber Light is guided in the core by total internal reflection: the airholes in the cladding make its effective index lower than that of the core NA = 0.8 Frascati 12/01/06

  15. B Low Index Guiding Fiber: Photonic bandgap fiber Light is guided in the core by Bragg reflection caused by the spatial periodicity of the holes in the cladding Frascati 12/01/06

  16. Fabrication of PCF Frascati 12/01/06

  17. PCF R&D financed by EGO Started in 11/04 - Goals: test of a commercial PCF hollow-core fiber in terms of : ** Handling, Coupling efficiency, loss measurements * Output Beam analysis, comparison with numerical modeling (coll with IRCOM-Limoges, Blaze Photonics) ** Measurement of phase noise introduced by the fiber in a normal environment *** Power standing of 20W, Induced amplitude noise, Polarisation noise (this fiber is not polar.maintaining fiber now), dependency of input/output noise Frascati 12/01/06

  18. HC-1060-02 Blaze Photonics Results on hollow-core HC-1060-02 Quasi-gaussian monomode >90% Attenuation < 0.1 dB/m Mode field diameter 6.5 mm Fresnel reflection at end faces <10-4 Core 10 mm, pitch 2.75 mm, holey region diam 50 mm No bend loss at 3 mm radius Frascati 12/01/06

  19. Measured near-field intensity Input face of the PCF Experimental results(2005) Coupling and handling like standard fibers; Attenuation loss measured 0.05 dB/m coupling of 90% obtained: further improvements with a phase plate or an adaptive mirror Transmission : output/input of 45% loss of 4.5% with a bending of 0.8 cm Residual coupling between core and cladding modes due to imperfections Frascati 12/01/06

  20. Extra Noise measurement The ouput of the PCF is sent into a high finesse Fabry-Perot as discriminant => no evidence of extra frequency noise No fast polarization & amplitude noises Power handling of 20W To be done: Choice between hollow core PCF and large silica core PCF (30 µm) Frascati 12/01/06

  21. Faraday isolators (> 55 dB isolation) 35 mm 55 mm Phase and amplitude modulators (GHz bandwidth, low voltage drive) Polarization controllers (20 kHz bandwidth) Available fiber components (for power <1W) Frascati 12/01/06

  22. Amplifier Oscillator (Nd-YAG or fibre 100 mW Faraday isolator Monomode fibre (PM?) Frequency control Amplitude control Polarization control Vacuum Beam monitoring Vacuum (optional) 100W to interferometer All-fibered Laser System Frascati 12/01/06

  23. Conclusion: Proposed main steps • 2006 Acquisition and test 1-2 W fibre laser (Yb @ 1064 nm) • Evaluation and control in Nice • 2007 Test as a master laser in Cascina Acquisition of a high power Yb-doped fiber amplifier • 2009 ? Test of a HP Yb-doped fiber amplifier • 2006-2008 Development and tests of a fibre mode-cleaner • After the choice of advanced mirrors material: • Definition and acquisition of the advanced laser system prototype ( 3 years ahead of installation) Frascati 12/01/06

More Related