40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  COMSOL elog  Not logged in ELOG logo
Entry  Wed Jun 5 13:49:13 2013, Deep Chatterjee, Optics, General, Difference in the Levin and Liu & Thorne results for thermal noise Levin_throne_comparison.pdfLevin_throne_comparison.png
    Reply  Wed Jun 5 16:56:53 2013, Matt A., Optics, General, Difference in the Levin and Liu & Thorne results for thermal noise 
Message ID: 8     Entry time: Wed Jun 5 13:49:13 2013     Reply to this: 9
Author: Deep Chatterjee 
Type: Optics 
Category: General 
Subject: Difference in the Levin and Liu & Thorne results for thermal noise 

The analytical expressions for thermal noise, as calculated by Liu & Thorne and Levin, was plotted as a function of frequency in a log - log plot using Matlab.

The value of the parameters were used from Levin's paper on  thermal noise.

phi = 1*10-7 (loss angle)

r0 = 1.56*10-2  (beam radius)

T = 300 K (temperature)

E0 = 7.18*1010   (Young's modulus)

sigma = 0.16 (Poisson ratio)

The value of Sx(100) that given in Levin's paper (8.7*10-40 m2 /Hz) while the Liu-Thorne value is 9.1*10-40 m2 /Hz.

Levin_throne_comparison.png

Attachment 1: Levin_throne_comparison.pdf  8 kB  | Hide | Hide all
Levin_throne_comparison.pdf
ELOG V3.1.3-