1 / 15

Increasing the laser power incident on the recycling mirrors

Increasing the laser power incident on the recycling mirrors. Doug Cook and Rick Savage LIGO commissioning meeting Dec. 22, 2003 Ref. LIGO-T030288-00-W. LIGO I design requirements circa 1995. 6 watts of laser power incident on the recycling mirror

maris
Download Presentation

Increasing the laser power incident on the recycling mirrors

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. Increasing the laser power incident on the recycling mirrors Doug Cook and Rick Savage LIGO commissioning meeting Dec. 22, 2003 Ref. LIGO-T030288-00-W

  2. LIGO I design requirementscirca 1995 • 6 watts of laser power incident on the recycling mirror • 8.5 watts of laser power delivered to the IOO subsystem • 10 watts of laser power delivered by the 126MOPA laser (Lightwave) • In a circular TEM00 mode

  3. Present PSL/IOO optical layout

  4. Example power budget

  5. Present H1 power budget

  6. Present H2 power budget

  7. Present L1 power budget

  8. Options for improvementoutside of the vacuum system • Increase 126MOPA power • Rebuild at Lightwave (LTW) to original specification. • Doesn’t include NPRO • Modify upstream PSL layout to facilitate swapping lasers • Mount phase-correcting EOM outside laser head • Add l/2 plate and polarizer to set power to FSS and PMC paths • Modematch upstream of FSS/PMC splitter • Mount PMC inside a vacuum chamber • Reduce mirror losses from hundreds to ~ 50 ppm • Implement single EOM modulation scheme • Eliminate two EOMs from beam path

  9. Proposed upstream PSL layout changes

  10. PMC transmission vs.mirror losses

  11. Expected H1 budgetwith only ‘outside’ improvements

  12. Expected H1 budget ifMC mirrors are also replaced

  13. Expected H2 budgetwith only ‘outside’ improvements

  14. Expected H2 budget ifFaraday isolator is also replaced

  15. Options for increasing the input laser power above the 11 W level • Rebuild the 126MOPA at LTW to 15-20 level • LTW technicians have indicated this is feasible • May have been demonstrated in another LTW product • Replace the PA pump diodes with higher power units • LTW has identified new vendor and are starting to use them in another product (Model 6000?). Stability issues? • Add a second amplifier head after the 126MOPA • Stanford has tested this configuration for Adv. LIGO PSL development work • Accelerate procurement of Adv. LIGO laser from Hannover/LZH.

More Related