Precise measurement for reflectivity of weak reflection FBG by Fabry Perot scale grating

2021 ◽  
Author(s):  
Qiushi Qin ◽  
Meng Wang ◽  
Binyu Rao ◽  
Zefeng Wang
Keyword(s):  
Precise Measurement ◽  
Fabry Perot ◽  
Weak Reflection

scholarly journals Understanding interferometry for micro-cantilever displacement detection

2016 ◽  
Vol 7 ◽  
pp. 841-851 ◽  
Author(s):  
Alexander von Schmidsfeld ◽  
Tobias Nörenberg ◽  
Matthias Temmen ◽  
Michael Reichling
Keyword(s):  
Precise Measurement ◽  
Systematic Approach ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Relative Positioning ◽  
Optimum Conditions ◽  
Noise Spectral Density ◽  
Atomic Force ◽  
Fabry Perot ◽  
Micro Cantilever

Interferometric displacement detection in a cantilever-based non-contact atomic force microscope (NC-AFM) operated in ultra-high vacuum is demonstrated for the Michelson and Fabry–Pérot modes of operation. Each mode is addressed by appropriately adjusting the distance between the fiber end delivering and collecting light and a highly reflective micro-cantilever, both together forming the interferometric cavity. For a precise measurement of the cantilever displacement, the relative positioning of fiber and cantilever is of critical importance. We describe a systematic approach for accurate alignment as well as the implications of deficient fiber–cantilever configurations. In the Fabry–Pérot regime, the displacement noise spectral density strongly decreases with decreasing distance between the fiber-end and the cantilever, yielding a noise floor of 24 fm/Hz0.5 under optimum conditions.

Noise suppression for the precise measurement of Fabry-Perot cavity with wide tunable range

2014 ◽  
Author(s):  
Radek Smid ◽  
Martin Cizek ◽  
Bretislav Mikel ◽  
Jan Hrabina ◽  
Josef Lazar ◽  
...  
Keyword(s):  
Precise Measurement ◽  
Noise Suppression ◽  
Tunable Range ◽  
Fabry Perot

Ultra-Precise Measurement of Distance by Fabry-Perot Resonator

2005 ◽  
pp. 45
Author(s):  
O. ?íp ◽  
F. Petr? ◽  
J. Lazar ◽  
Z. Buchta
Keyword(s):  
Precise Measurement ◽  
Fabry Perot

scholarly journals Precise Measurement of Hyperfine Structure of Cesium 7S1/2 Excited State

2020 ◽  
Vol 10 (2) ◽  
pp. 525 ◽  
Author(s):  
Yunhui He ◽  
Jiabei Fan ◽  
Liping Hao ◽  
Yuechun Jiao ◽  
Jianming Zhao
Keyword(s):  
Excited State ◽  
Hyperfine Structure ◽  
Precise Measurement ◽  
Double Resonance ◽  
Probe Laser ◽  
Transition Line ◽  
Coupling Laser ◽  
Electro Optic ◽  
Fabry Perot ◽  
Optical Double Resonance

We present a precise measurement of the hyperfine structure of cesium 7 S 1 / 2 excited state by employing electromagnetically induced spectroscopy (EIS) with a cesium three-level cascade ( 6 S 1 / 2 − 6 P 3 / 2 − 7 S 1 / 2 ) atom in a room temperature vapor cell. A probe laser, λ p = 852 nm, was coupled to a transition | 6 S 1 / 2 ⟩ → | 6 P 3 / 2 ⟩ , related frequency locked to the resonance hyperfine transition of | 6 S 1 / 2 ⟩ → | 6 P 3 / 2 ⟩ with a Fabry–Perot (FP) cavity and an electro-optic modulator (EOM). A coupling laser, λ c = 1470 nm, drove the | 6 P 3 / 2 ⟩ → | 7 S 1 / 2 ⟩ transition with the frequency scanned over the | 6 P 3 / 2 ⟩ → | 7 S 1 / 2 ⟩ transition line. The hyperfine level interval was extracted to be 2183.61 ± 0.50 MHz by analyzing EIS spectroscopy. The optical–optical double-resonance (OODR) spectroscopy is also presented for comparison, with the corresponding value of the hyperfine level interval being 2183.48 MHz ± 0.04 MHz, and the measured hyperfine splitting of excited 7 S 1 / 2 state is shown to be in excellent agreement with the previous work.

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