Beam Size Effects and Mode Coupling in Optics Modeling
Explore the impact of beam size on contrast defects, mode coupling, and mode mismatches in optics modeling by Hiro Yamamoto. Learn about PRMI vs PRFPM vs CR, ITM SPTWE effects, and more. Understand how arms, compensators, and lens configurations influence beam characteristics. Gain insights into ITM non-uniformity and its effects on mode behavior.
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Presentation Transcript
H1 and model by FFT+COC Hiro Yamamoto LIGO/Caltech l Effects of ITM SPTWE l Simple Contrast Defect calculation l Beam size effect l PRMI vs PRFPM SB vs CR 1 Hiro Yamamoto modeling mtg 9/12/2014 LIGO-G1401117
ITM SPTWE (tilt, power removed) and BS maps 2 Hiro Yamamoto modeling mtg 9/12/2014 LIGO-G1401117
Contrast Defect estimation dx dy CD = Power(Ex- Ey)/Power(Ex+ Ey) = dxdy(2k)2 2 pw2exp(-2r2 )(dx(x,y)-dy(x,y))2/4 w2 Ex= E0exp(i2kdx) Ey= E0exp(i2kdy) LLO case Hiro Yamamoto modeling mtg 9/12/2014 LIGO-G1401117
PRMI vs PRFPM SB vs CR When arms are attached, CR does not see none of these Arm modes determine the CR mode H1 : CD 190, PRG 40, w(ITM) = 5.3cm L1 : CD 280, PRG 40, w(ITM) = 5.3cm The mode seen in PRMI without arm is the mode of BS with arm attached When CP is used to compensate the large diverging lens, SB mode matches with CR mode and the beam size is optimal (5.3cm) When RH is used to compensate the large diverging lens Modes of CR and SB mismatch SB beam on ITM becomes larger (5.7~6.6cm) and ITM non uniformity affects more l l l l 4 Hiro Yamamoto modeling mtg 9/12/2014 LIGO-G1401117
Mode coupling vs beam size w ITMX ITMY 5.3cm 6.6cm 1.1% 0.2% 3.2% 1.0% 5 Hiro Yamamoto modeling mtg 9/12/2014 LIGO-G1401117
