Design, construction and characterization of a single unit external cavity diode laser coupled tapered amplifier system for atomic physics

Wells, Stephen R.; Miyabe, Masabumi; Hasegawa, Shuichi

doi:10.1016/j.optlastec.2020.106118

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…During the preparation of the manuscript, authors learned of a related work [100] which presents the design and characteristics of the ECDL-TA 850 nm system and discusses the influence of thermal disturbances on its stability.…”

Section: Discussionmentioning

confidence: 99%

Opto-Electronics Review

Szonert,

Głódź,

Kowalski

2021

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We developed a three-stage, amplifying, tunable diode laser system that comprises a master laser in a Littrow configuration, frequency-stabilized by dichroic atomic vapour laser lock, acousto-optic frequency shifter, injection-locked slave laser, and tapered amplifier. The slave amplifies the injected frequency-shifted master beam while suppressing (within 0.5 %) the strong dependence of its intensity on the acousto-optic frequency shifter carrier frequency, thus acting as a strongly saturated optical limiting amplifier with constant output power. The resulting beam is then amplified in a tapered amplifier. The system provides an output power above 700 mW at a wavelength of 780 nm, with a time-averaged linewidth of 0.6 MHz, and a frequency drift below 2 MHz/h. Dichroic atomic vapour laser lock enables frequency stabilization in the range of 400 MHz around D2 lines of rubidium. The mode-hop-free tuning range amounts to 2 GHz. Determined by the acousto-optic frequency shifter model used, the fine-tuning range (precision of few tens kHz) spans 70 MHz. A description of the system was presented and its performance was tested. The basic components have been designed in our laboratory.

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Section: Discussionmentioning

confidence: 99%

Opto-Electronics Review

Szonert,

Głódź,

Kowalski

2021

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“…For the first and second step transitions home-made ECDL systems were constructed for that purpose. The third step, being a transition into a Rydberg state, required higher optical powers as these transitions have small oscillator strength condition, and for this purpose a home-made ECDL-TPA system was constructed [15].…”

Section: Introductionmentioning

confidence: 99%

Resonance ionisation spectrometry measurement of atomic calcium Rydberg isotope shifts

Wells¹,

Miyabe²,

Iwata³

et al. 2021

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

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Rydberg levels in atomic calcium are of interest due to their use in highly isotope selective multiple-step resonance ionisation spectrometry, and also for nuclear physics investigations, but gaps remain in the data for higher lying levels in calcium isotopes other than Ca 40 . We report novel isotope shift data on four isotopes of calcium ( Ca 42 , Ca 43 , Ca 44 , Ca 48 ), relative to the majority abundance isotope Ca 40 , in six Rydberg transitions for each P (n = 25–30) and F (n = 23–28) angular momentum quantum number designated series.

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Adaptive penalty method with an Adam optimizer for enhanced convergence in optical waveguide mode solvers

Chiang

2023

Opt. Express

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We propose a cutting-edge penalty method for optical waveguide mode solvers, integrating the Adam optimizer into pseudospectral frequency-domain (PSFD) frameworks. This strategy enables adaptable boundary fluctuations at material interfaces, significantly enhancing numerical convergence and stability. The Adam optimizer, an adaptive algorithm, is deployed to determine the penalty coefficient, greatly improving convergence rates and robustness while effectively incorporating boundary conditions into the interfaces of subdomains. Our solver evaluates the numerical performance of optical waveguides by calculating effective indices of standard benchmark waveguides with high accuracy. This method diminishes numerical boundary errors and provides a marked increase in convergence speed and superior accuracy when compared to conventional methods and even metaheuristic optimization methods, all while maintaining the inherent global spectral accuracy of the PSFD.

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Design, construction and characterization of a single unit external cavity diode laser coupled tapered amplifier system for atomic physics

Cited by 3 publications

References 21 publications

Opto-Electronics Review

Opto-Electronics Review

Resonance ionisation spectrometry measurement of atomic calcium Rydberg isotope shifts

Adaptive penalty method with an Adam optimizer for enhanced convergence in optical waveguide mode solvers

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