Athermal fiber laser for the SWARM absolute scalar magnetometer

Fourcault, William; Léger, Jean‐Michel; Costes, Vincent; Fratter, Isabelle; Mondin, L.

doi:10.1117/12.2309215

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…The pump laser is a key sub-system of the sensor. It relies on a fiber laser architecture including a pump laser diode, a wavelength division multiplexer (WDM), an Yb doped fiber Bragg grating (FBG), an optical isolator and a splitter to allow for feedback control (Fourcault et al 2010). A noise reduction feedback loop is implemented resulting in a relative intensity noise (RIN) in the order of −130/−140 dB ( √ Hz) −1 between 4-45 kHz.…”

Section: Description Of the Experimental Layoutmentioning

confidence: 99%

Magnetocardiography measurements with⁴He vector optically pumped magnetometers at room temperature

et al. 2017

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In this paper, we present a proof of concept study which demonstrates for the first time the possibility to record magnetocardiography (MCG) signals with 4 He vector optically-pumped magnetometers (OPM) operated in a gradiometer mode. Resulting from a compromise between sensitivity, size and operability in a clinical environment, the developed magnetometers are based on the parametric resonance of helium in zero magnetic field. Sensors are operated at room-temperature and provide a tri-axis vector measurement of the magnetic field. Measured sensitivity is around 210 fT/√Hz in the bandwidth [2 Hz; 300 Hz]. MCG signals from a phantom and two healthy subjects are successfully recorded. Human MCG data obtained with the OPMs are compared to reference electrocardiogram (ECG) recordings: similar heart rates, shapes of the main patterns of the cardiac cycle (P/T waves, QRS complex) and QRS widths are obtained with both techniques.

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Section: Description Of the Experimental Layoutmentioning

confidence: 99%

Magnetocardiography measurements with⁴He vector optically pumped magnetometers at room temperature

et al. 2017

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“…The relative intensity noise (RIN) is particularly essential in affecting the weak laser signal detection, and has * Author to whom any correspondence should be addressed. always been deemed as a core specification to determine the sensitivity of measurements [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

An effective and universal intensity noise suppression technique for single-frequency fiber lasers at 1.5 μm

Zhou¹,

Zhao²,

Feng³

et al. 2021

Laser Phys.

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We report on an effective and universal technique to fulfill intensity noise suppression for single-frequency fiber lasers (SFFLs) at 1.5 μm. Utilizing a gain-saturated semiconductor optical amplifier and the effective filtering of amplified spontaneous emission, the resultant relative intensity noises of three diverse SFFLs are maintained at −155 dB Hz−1; which is only <0.9 dB from the shot noise limit in the frequency range from 100 kHz to 50 MHz. Refering to the three paradigmatic experimental results, this technology, as a promising external solution of noise suppression, can be modularized to promote the application of SFFLs.

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Simultaneous achievement of power boost and low-frequency intensity noise suppression in a bidirectional pumping fiber amplifier based on saturated even-distribution gain

Zeng¹,

Peng²,

Zhao³

et al. 2023

Opt. Express

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An optimized bidirectional pumping fiber amplifier is demonstrated to achieve low-frequency intensity noise suppression and effective power enhancement simultaneously. Based on the concept analysis of the gain saturation effect, the influence of input signal power and pump power on intensity noise suppression is investigated and optimized systematically. Further combining with the optimization of the pumping configuration to achieve the even-distribution gain, the relative intensity noise (RIN) of 1083 nm single-frequency fiber laser (SFFL) is suppressed with 9.1 dB in the frequency range below 10 kHz. Additionally, the laser power is boosted from 10.97 dBm to 25.02 dBm, and a power instability of ±0.31% is realized. This technology has contributed to simultaneously improving the power and noise performance of the 1083 nm SFFL, which can be applied to a multi-channel helium (He) optically pumping magnetometer. Furthermore, this technique has broken the mindset that power amplification of the conventional fiber amplifiers will inevitably cause the degradation of intensity noise property, and provided a valuable guidance for the development of high-performance SFFLs.

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Athermal fiber laser for the SWARM absolute scalar magnetometer

Cited by 3 publications

References 4 publications

Magnetocardiography measurements with⁴He vector optically pumped magnetometers at room temperature

Magnetocardiography measurements with⁴He vector optically pumped magnetometers at room temperature

An effective and universal intensity noise suppression technique for single-frequency fiber lasers at 1.5 μm

Simultaneous achievement of power boost and low-frequency intensity noise suppression in a bidirectional pumping fiber amplifier based on saturated even-distribution gain

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Athermal fiber laser for the SWARM absolute scalar magnetometer

Cited by 3 publications

References 4 publications

Magnetocardiography measurements with4He vector optically pumped magnetometers at room temperature

Magnetocardiography measurements with4He vector optically pumped magnetometers at room temperature

An effective and universal intensity noise suppression technique for single-frequency fiber lasers at 1.5 μm

Simultaneous achievement of power boost and low-frequency intensity noise suppression in a bidirectional pumping fiber amplifier based on saturated even-distribution gain

Contact Info

Product

Resources

About

Magnetocardiography measurements with⁴He vector optically pumped magnetometers at room temperature

Magnetocardiography measurements with⁴He vector optically pumped magnetometers at room temperature