Monitoring and active stabilization of laser injection locking using beam ellipticity

Mishra, Umang; Vyacheslav, Li,; Wald, Sebastian; Agafonova, Sofia; Diorico, Fritz; Hosten, Onur

doi:10.1364/ol.495553

Opt. Lett.

2023

DOI: 10.1364/ol.495553

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Monitoring and active stabilization of laser injection locking using beam ellipticity

Umang Mishra

Li, Vyacheslav

Sebastian Wald

et al.

Abstract: We unveil a powerful method for the stabilization of laser injection locking based on sensing variations in the output beam ellipticity of an optically seeded laser. The effect arises due to an interference between the seeding beam and the injected laser output. We demonstrate the method for a commercial semiconductor laser without the need for any internal changes to the readily operational injection locked laser system that was used. The method can also be used to increase the mode-hop free tuning range of l… Show more

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2024

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Cited by 2 publications

References 31 publications

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Progress toward ultra-cold Sr for the AION project—A red MOT and an optical-heterodyne diagnostic tool for injection-locked laser diodes

Pasatembou,

Baynham,

Buchmüller

et al. 2024

AVS Quantum Science

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Long-baseline atom interferometers, such as the one to be built by the AION collaboration, require ultra-cold atomic clouds. These are produced by trapping the atoms in magneto-optical traps (MOTs) using high-power, narrow-linewidth lasers. We report on the laser and optical master–slave injection-locked system used to address the 1S0–3P1 strontium transition at 689 nm and on the trapping of strontium atoms in a narrowband MOT. We demonstrate the quality of the injection through the characterization of the injection lock using an easy-to-assemble method that uses a double-pass acousto-optic modulator to generate and detect a heterodyne beatnote. The reported system is used to produce an atomic cloud at a temperature of 812(43) nK in a narrowband red MOT.

show abstract

Progress toward ultra-cold Sr for the AION project—A red MOT and an optical-heterodyne diagnostic tool for injection-locked laser diodes

Pasatembou,

Baynham,

Buchmüller

et al. 2024

AVS Quantum Science

View full text Add to dashboard Cite

show abstract

Laser-cavity locking utilizing beam ellipticity: accessing the 10⁻⁷ instability scale relative to cavity linewidth

Diorico,

Zhutov,

Hosten

2024

Optica

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Frequency-stable lasers form the back bone of precision measurements in science and technology. Such lasers typically attain their stability through frequency locking to reference cavities. State-of-the-art locking performances to date had been achieved using frequency modulation based methods, complemented with active drift cancellation systems. We demonstrate an all passive, modulation-free laser-cavity locking technique (squash locking) that utilizes changes in spatial beam ellipticity for error signal generation, and a coherent polarization post-selection for noise resilience. By comparing two identically built proof-of-principle systems, we show a frequency locking instability of 5×10−7 relative to the cavity linewidth at 10 s averaging. The results surpass the demonstrated performances of methods engineered over the last five decades, potentially enabling an advancement in the precision control of lasers, while creating avenues for bridging the performance gaps between industrial grade lasers with scientific ones due to the afforded simplicity and scalability.

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Monitoring and active stabilization of laser injection locking using beam ellipticity

Cited by 2 publications

References 31 publications

Progress toward ultra-cold Sr for the AION project—A red MOT and an optical-heterodyne diagnostic tool for injection-locked laser diodes

Progress toward ultra-cold Sr for the AION project—A red MOT and an optical-heterodyne diagnostic tool for injection-locked laser diodes

Laser-cavity locking utilizing beam ellipticity: accessing the 10⁻⁷ instability scale relative to cavity linewidth

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Monitoring and active stabilization of laser injection locking using beam ellipticity

Cited by 2 publications

References 31 publications

Progress toward ultra-cold Sr for the AION project—A red MOT and an optical-heterodyne diagnostic tool for injection-locked laser diodes

Progress toward ultra-cold Sr for the AION project—A red MOT and an optical-heterodyne diagnostic tool for injection-locked laser diodes

Laser-cavity locking utilizing beam ellipticity: accessing the 10−7 instability scale relative to cavity linewidth

Contact Info

Product

Resources

About

Laser-cavity locking utilizing beam ellipticity: accessing the 10⁻⁷ instability scale relative to cavity linewidth