Stable continuous-wave single-frequency intracavity frequency-doubled laser with intensity noise suppressed in audio frequency region*

Gao, Yinghao; Li, Yuanji; Feng, Jing; Zhang, Kuanshou

doi:10.1088/1674-1056/ab327b

“…A polarization controller is placed behind TmDFA to improve the polarization character. A Mach-Zehnder (MZ) interferometer [44] is implemented with a feedback sero to actively suppress the laser intensity noise but with a fixed s polarization. At the present stage, the residual intensity fluctuation of 1879.43 nm laser beam is suppressed from ±6% to ±0.6%.…”

Section: Magic Odt For Cs 6s 1/2 Ground State and 84p 3/2 Rydberg Sta...mentioning

confidence: 99%

Towards implementation of a magic optical-dipole trap for confining ground-state and Rydberg-state cesium cold atoms

Bai

¹

,

Liu

²

,

He

³

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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Long ground-Rydberg coherence lifetime is interesting for implementing high-fidelity quantum logic gates, many-body physics, and other quantum information protocols. However, the potential formed by a conventional far-off-resonance red-detuned optical-dipole trap (ODT) is usually repulsive for Rydberg atoms, which will result in fast atom loss and low repetition rate of the experimental sequence. These issues can be addressed by a magic ODT. We performed the calculation of ODT’s magic detuning for confinement of ground-state and Rydberg-state cesium atoms with the same potential well. We used a sum-over-states method to calculate the dynamic polarizabilities of 6S1/2 ground state and highly-excited (nS1/2 and nP3/2) Rydberg state of cesium atoms, and identify corresponding magic detuning for optical wavelengths in the range of 850–1950 nm. We estimated the trapping lifetime of cesium Rydberg atoms confined in the magic ODT by including different dissipative mechanisms. Furthermore, we have experimentally realized an 1879.43 nm single-frequency laser system with a watt-level output power for setting up the magic ODT for 6S1/2 ground-state and 84P3/2 Rydberg-state cesium cold atoms.

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Low-noise and high-power second harmonic generation of 532 nm laser for trapping ultracold atoms

Wang

¹

,

Zhou

²

,

Li

³

et al. 2022

Review of Scientific Instruments

3

0

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Optical lattices for coherently manipulating ultracold atoms demand high-power, low-noise, narrow-line-width, and continuous-wave lasers. Here, we report the implementation of a 30 W 532 nm low-noise laser by second harmonic generation from a 1064 nm fiber laser, which is capable to generate optical lattices for a quantum gas microscope of [Formula: see text] atoms. The overall conversion efficiency is 59% at an input power of 51 W with a lithium triborate crystal coupled to a ring cavity. The relative intensity noise of the output laser is suppressed to −120 dBc/Hz in the range of 10 Hz–100 kHz with a high dynamic range of over 50 dB, which is suitable for long-term trapping and coherent manipulation of the quantum gases.

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Suppression of laser beam’s polarization and intensity fluctuation via a Mach–Zehnder interferometer with proper feedback

Hou

¹

,

Liu

²

,

Wang

³

et al. 2023

AIP Advances

0

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Long ground-Rydberg coherence lifetime is interesting for implementing high-fidelity quantum logic gates, many-body physics, and other quantum information protocols. However, the potential well formed by a conventional far-off-resonance red-detuned optical-dipole trap that is attractive for ground-state cold atoms is usually repulsive for Rydberg atoms, which will result in the rapid loss of atoms and low repetition rate of the experimental sequence. Moreover, the coherence time will be sharply shortened due to the residual thermal motion of cold atoms. These issues can be addressed by a one-dimensional magic lattice trap, which can form a deeper potential trap than the traveling wave optical dipole trap when the output power is limited. In addition, these common techniques for atomic confinement generally have certain requirements for the polarization and intensity stability of the laser. Here, we demonstrated a method to suppress both the polarization drift and power fluctuation only based on the phase management of the Mach–Zehnder interferometer for a one-dimensional magic lattice trap. With the combination of three wave plates and the interferometer, we used the instrument to collect data in the time domain, analyzed the fluctuation of laser intensity, and calculated the noise power spectral density. We found that the total intensity fluctuation comprising laser power fluctuation and polarization drift was significantly suppressed, and the noise power spectral density after closed-loop locking with a typical bandwidth of 1–3000 Hz was significantly lower than that under the free running of the laser system. Typically, at 1000 Hz, the noise power spectral density after locking was about 10 dB lower than that under the free running of a master oscillator power amplifier system. The intensity–polarization control technique provides potential applications for atomic confinement protocols that demand fixed polarization and intensity.

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Stable continuous-wave single-frequency intracavity frequency-doubled laser with intensity noise suppressed in audio frequency region*

Cited by 3 publications

References 22 publications

Towards implementation of a magic optical-dipole trap for confining ground-state and Rydberg-state cesium cold atoms

Towards implementation of a magic optical-dipole trap for confining ground-state and Rydberg-state cesium cold atoms

Low-noise and high-power second harmonic generation of 532 nm laser for trapping ultracold atoms

Suppression of laser beam’s polarization and intensity fluctuation via a Mach–Zehnder interferometer with proper feedback

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