Research on Fiber Raman Laser Source for Mobile Quantum Gravimeter

Junchao GAO; Junjie CHEN; Liuxian YE; Bing CHENG; Bin WU; Helin WANG; Xiaolong WANG; Qiang LIN

doi:10.3788/gzxb20245308.0814003

Acta Photonica Sinica, Volume. 53, Issue 8, 0814003(2024)

Research on Fiber Raman Laser Source for Mobile Quantum Gravimeter

Junchao GAO... Junjie CHEN, Liuxian YE, Bing CHENG, Bin WU, Helin WANG*, Xiaolong WANG and Qiang LIN |Show fewer author(s)

Author Affiliations

Zhejiang Provincial Key Laboratory of Quantum Precision Measurement， College of Science， Zhejiang University of Technology， Hangzhou 310023， China

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Figures & Tables(13)

Fig. 1. Low phase noise and narrow linewidth Raman fiber laser system

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Fig. 2. Noise model of optical phase-locked loop in the narrow linewidth Raman fiber laser

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Fig. 3. The influence of Raman phase noise on the sensitivity of gravimeter under different T and τ value

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Fig. 4. Power spectral density of phase noise of Raman beat signal. Illustration ： beat signal diagram

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Fig. 5. The gravity sensitivity limit and total phase noise at different beat optical power ratios

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Fig. 6. The phase noise power spectral density of the laser system with different 7G signal sources and different 7G sources is analyzed.

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Fig. 7. Phase noise spectral density of Raman laser system and different devices in the system.

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Fig. 8. Phase noise and gravity sensitivity in different frequency bands

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Fig. 9. Stability of phase noise and gravity sensitivity of Raman fiber laser

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Fig. 10. Frequency stability of beat light in Raman laser system

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Fig. 11. Allen variance of beat frequency stability of Raman laser system under different integration time

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Table 1. Noise transfer function of each device

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Table 1. Noise transfer function of each device

Noise source	Transfer function
Reference signal source	$T_{r e f} (s) = \frac{ϕ_{R a m}}{ϕ_{r e f}} = N G (s)$
Phase detector	$T_{P F D} (s) = \frac{ϕ_{R a m}}{ϕ_{P F D}} = \frac{N}{K_{d}} G (s)$
Low-pass filter	$T_{L F} (s) = \frac{ϕ_{R a m}}{ϕ_{L F}} = \frac{N}{e^{- s τ} K_{d} F (s)} G (s)$
Laser	$T_{L} (s) = \frac{ϕ_{R a m}}{ϕ_{L}} = \frac{G (s)}{H (s)}$
Frequency divider	$T_{/ N} (s) = \frac{ϕ_{R a m}}{ϕ_{/ N}} = - N G (s)$
Photoelectric probe	$T_{P D} (s) = \frac{ϕ_{R a m}}{ϕ_{P D}} = - G (s)$
7 GHz signal source	$T_{7 G} (s) = \frac{ϕ_{R a m}}{ϕ_{7 G}} = G (s)$
Mixer	$T_{M i x} (s) = \frac{ϕ_{R a m}}{ϕ_{M i x}} = - G (s)$

Table 2. Noise power spectral density of each device

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Table 2. Noise power spectral density of each device

Noise source	Noise power spectral density
Reference signal source	$S_{ϕ_{r e f}} (f) = \{\begin{array}{l} 10^{- 12.58759} + \frac{10^{- 9.59512}}{f} + \frac{10^{- 6.59232}}{f^{2}} (10 H z \leq f \leq 100 k H z) \\ 10^{- 14.06524} + \frac{10^{- 2.59547}}{f^{2}} (100 k H z \leq f \leq 10 M H z) \end{array}$
Phase detector	$S_{ϕ_{P F D}} (f) = 10^{- 15.2752} + \frac{10^{- 12.89131}}{f}$
Low-pass filter	$S_{ϕ_{L F}} (f) = 4 k_{b} T R$
Laser	$S_{ϕ_{L}} (f) = \frac{10^{2.82978}}{f^{2}} + \frac{10^{6.54404}}{f^{3}} + \frac{10^{9.19809}}{f^{4}}$
Frequency divider	$S_{ϕ_{/ N}} (f) = 10^{- 15.43998} + \frac{10^{- 11.98159}}{f}$
Photoelectric probe	$S_{ϕ_{P D}} (f) = \frac{10^{- 11.5}}{f}$
7 GHz signal source	$S_{ϕ_{7 G}} (f) = \{\begin{array}{l} 10^{- 12.28186} + \frac{10^{- 5.79388}}{f^{2}} + \frac{10^{- 3.596072}}{f^{^{3}}} (10 H z \leq f \leq 100 k H z) \\ 10^{- 13.94731} + \frac{10^{- 2.28974}}{f^{2}} (100 k H z \leq f \leq 10 M H z) \end{array}$
Mixer	$S_{ϕ_{M i x}} (f) = 10^{- 17} + \frac{10^{- 14}}{f}$

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Junchao GAO, Junjie CHEN, Liuxian YE, Bing CHENG, Bin WU, Helin WANG, Xiaolong WANG, Qiang LIN. Research on Fiber Raman Laser Source for Mobile Quantum Gravimeter[J]. Acta Photonica Sinica, 2024, 53(8): 0814003

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