Study on the sensitivity of optical cavity length to light power fluctuation Download: 933次
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China
Figures & Tables
Fig. 1. (a) Diagram of a high-reflective mirror. It is coated at the center with a diameter of 10 mm. The red spot at the coating center represents a light spot to which an absorbed light power is applied. Schematic diagram of (b) a football cavity and (c) a cylinder cavity.
下载图片 查看原文
Fig. 2. Experimental setup for the measurement of the cavity sensitivity S. EOM, electro-optic modulator; PBS, polarization beam splitter; λ∕4, quarter-wave plate; PD, photo detector; RF, radio frequency; DBM, double balance mixer.
下载图片 查看原文
Fig. 3. (a) The thermally induced deformations of the cavity. (b) The temperature change of the probe points inside ω0 (blue open squares) and those on the mirror contacting surface (pink dots) over time.
下载图片 查看原文
Fig. 4. Simulation results of S/S0 (a) when the parameters of the cavity and coating are doubled and (b) when the CTE (blue open squares, upper axis) or the thermal conductivity (black filled triangles, lower axis) of the cavity and mirror substrate changes.
下载图片 查看原文
Table1. Main Parameters Used in the Numerical Calculations
Material | ULEa | FSa[13] | Siliconb[7,14–16] | Sapphirec[14,17,18] | a[13,14,19] | d[14,20] | a[21,22] |
---|
E (GPa) | 67.6 | 72 | 187.5 | 464 | 72/140 | 60/140 | 100 | | 0.17 | 0.17 | 0.28 | 0.23 | 0.17/0.23 | 0.159/0.21 | 0.32 | () | 2210 | 2200 | 2330 | 3997 | 2200/6850 | 2200/6850 | 4551 | (/K) | † | | # | | | | | (W/m/K) | 1.31 | 1.38 | 500/10# | 110 | 1.38/33 | 0.13/0.07 | 62.9§ | (J/kg/K) | 767 | 670 | 0.22 | 0.09 | 746/306 | 1/3.17 | 360§ | | 0.85 | 0.85 | 0.55 | 0.47 | N.A | N.A | N.A |
|
查看原文
Table2. Calculated Effective CTEs for Coatings
Substrate | Coating | (/K) | (/K) |
---|
ULE | | | | FS | | | | Silicon* | | | | Sapphire† | | | | FS | | | |
|
查看原文
Table3. Simulated Sensitivity S when the Cavity Material Variesa
Spacer | Mirror | Coating | (m) | (m) | (/μW) | () |
---|
FS | FS | | | | | 58 | ULE | ULE | | | | | 32 | ULE | FS | | | | | 35 | ULE | FS | | | | | 6 | Silicon | Silicon | | */# | | */# | 0.008*/0.01# | Sapphire | Sapphire | | † | † | † | 0.005† |
|
查看原文
Wen Qi, Yanyi Jiang, Xueyan Li, Li Jin, Zhiyi Bi, Longsheng Ma. Study on the sensitivity of optical cavity length to light power fluctuation[J]. Chinese Optics Letters, 2016, 14(10): 101401.