Fabry-Perot cavity. Pierre Favier Laboratoire de l Accélérateur Linéaire
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1 Fabry-Perot cavity Pierre Favier Laboratoire de l Accélérateur Linéaire Programme Investissements d avenir de l Etat ANR-10-EQPX-51. Financé également par la Région Ile-de-France. Program «Investing in the future» ANR-10-EQOX-51. Work also supported by grants from Région Ile-de- France.
2 Optical table 2
3 Flux 3
4 Vacuum chamber + ionic pumps 4
5 Tube + soufflets + vannes 5
6 ThomX mirrors received Input mirror: Saphir Other substrates in ULE (Ultra Low Expansion glass) Deformation : 55x less than silice Already demonstrated Coating from LMA (Lyon) Theoretical finesse ~ Theoretical gain ~ Theoretical band-width ~ 800 Hz 6
7 Prototype for ThomX Airlock Clean room. Laminar flux ISO 4 7
8 Prototype for ThomX 8
9 Mirror changing protocol Clean room, full suit, powderfree gloves Ionising gun Slow movements to limit air flow Injection mirror changed 3 times in 2 weeks Finesse measurements always in agreement with theoretical value Good repeatability About ½ day to replace and realign 9
10 Laser oscillator Two OneFive oscillators (serial + spare). Ordered for ThomX -> June/July Spare oscillator received Used on prototype For high power test Check certifications for ThomX s oscillator Phase noise below our reference (CW laser) Good CEP stability Lock only with the PZT (fast loop not needed) 10
11 Error signal (PDH) MENLO OneFive Cavity bandwidth: 5 khz ThomX cavity: 0,8 khz 11
12 Phase noise 12
13 Increase the bandwidth Analytical calculations High finesse «degraded» > Low finesse Same gain but larger bandwidth Blue : Low finesse Red : High finesse «degraded» Degradation Change CEP 13
14 Amp. #1 Amp. #2 Amp. #3 Global architecture Fiber amplifier. CELIA Laser oscillator Amplifier Optical cavity IP e- ring <P> ~ 10 mw <P> ~ 100 W <P> ~ 300 kw Stretcher 5 mw 100 W Compressor Gain ~ Three stage amplifier
15 Amp. #1 Amp. #2 Amp. #3 laser system Fiber amplifier: design Oscillator Stretcher Compressor CVBG: Chirped Volume Bragg Grating
16 Amp. #1 Amp. #2 Amp. #3 Fiber amplifier: design Preamp Oscillator Stretcher Compressor 976nm 976nm 9 976nm 1 mw WDM WDM COMB YDF 6/125 PM YDF 6/125 PM 100 mw 40 mw 330 mw DC YDF 12/130 PM 2 W
17 Amp. #1 Amp. #2 Amp. #3 Fiber amplifier: design Ampli principal. 6x 55 W laser system Main amplifier Oscillator Stretcher Compressor 6 x 976nm COMB DC YDF 40/200 PZ Pump module Combiner 6+1 to 1 Yb-doped DC fiber 40/200 PZ
18 Fiber amplifier: results laser system Max power: 210 W Stability over 104 W : 210 W h=69%
19 laser system Fiber amplifier: beam quality Beam quality at high power (a) (b) 0A/4W 5A/97W (c) (d) 11A/200W 8A/158W
20 Conclusions et prospects Spare oscillator of excellent quality Fiber amplifier of Mightylaser being repaired (35 W) High power tests on cavity should start this week Serial oscillator ordered Amplifier in the last stage of conception Mirors received (installation in prototype in April) Clean room OK Optical table, mechanics, vacuum, finishing First alignement ~ April with CW oscillator May-June: High power in ThomX cavity Cassou, Chiche, Cormier, Douillet, Favier, Jehanno, Lhermite, Liu, Martens, Peynaud, Plaige, Rusquart, Soskov, Trochet, Zomer. 20
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