Injection locking of a low cost high power laser diode at 461 nm

Pagett, C. J. H.; Moriya, Paulo Hisao; Teixeira, Renata Cordeiro; Shiozaki, R. F.; Hemmerling, M.; Courteille, Ph. W.

doi:10.1063/1.4947462

Cited by 20 publications

(14 citation statements)

References 15 publications

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“…The strong current interest in atomic strontium for metrological and interferometrical applications [7][8][9][10][11][12] motivates a quest for compact solutions for the laser sources needed to cool, trap and control strontium gases [13][14][15][16]. Most experiments require, apart from a laser at 461nm driving the strong blue cooling transition « ( ) ( ) 5s S 5s5p P 2 1 0 1 1 (see figure 1), at least one 'repumping' laser for recycling the population of atoms pumped into the metastable state ( ) 5s5p P 3 2 , and sometimes a second repumper laser, which would recycle the atoms pumped into the metastable ( ) 5s5p P 3 0 (to which some atoms decay after being repumped from the P 3 2 ).…”

Section: Introductionmentioning

confidence: 99%

Comparison between 403 nm and 497 nm repumping schemes for strontium magneto-optical traps

et al. 2018

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The theoretical description of the external degrees of freedom of atoms trapped inside a magnetooptical trap (MOT) often relies on the decoupling of the evolution of the internal and external degrees of freedom. That is possible thanks to much shorter timescales typically associated with the first ones. The electronic structure of alkaline-earth atoms, on the other hand, presents ultra-narrow transitions and metastable states that makes such an approximation invalid in the general case. In this article, we report on a model based on open Bloch equations for the evolution of the number of atoms in a magneto-optical trap. With this model we investigate the loading of the strontium blue magnetooptical trap under different repumping schemes, either directly from a Zeeman slower, or from an atomic reservoir made of atoms in a metastable state trapped in the magnetic quadrupolar field. The fluorescence observed on the strong 461 nm transition is recorded and quantitatively compared with the results from our simulations. The comparison between experimental results and calculations within our model allowed to identify the existence of the decay paths between the upper level of the repumping transition and the dark strontium metastable states, which could not be explained by electric dipole transition rates calculated in the literature. Moreover, our analysis pinpoints the role of the atomic movement in limiting the efficiency of the atomic repumping of the Sr metastable states.

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Section: Introductionmentioning

confidence: 99%

Comparison between 403 nm and 497 nm repumping schemes for strontium magneto-optical traps

et al. 2018

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“…However, since SOA devices based on GaN do not exist yet in general, a high cost is inevitable. Alternatively, injection locking technique would be useful to develop a power-scalable laser system with a low cost [9,10]. In laser injection locking, a weak monochromatic signal from a master laser oscillator is injected into the cavity of a second self-sustained slave laser oscillator.…”

Section: Deflection Laser System Concept Of Blue-violet High-power Diode Laser Systemmentioning

confidence: 99%

Development of the laser isotope separation method to study for the neutrino-less double beta decay of ⁴⁸Ca

Ogawa

Kawashima

Hiraiwa

et al. 2022

J. Phys.: Conf. Ser.

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Search for the ultra-rare process, neutrino-less double beta decay, is a powerful tool to test the Majorana nature of neutrinos. Among the potential double beta decay nuclei, 48Ca has the largest Q-value, hence we can expect the measurement with least background. On the other hand, due to its low natural abundance, isotope enrichment is essential to achieve the sensitivity in the region of interest (inverted/normal mass hierarchy of neutrinos). We have been developing a laser isotope separation method using a tunable semiconductor laser that can excite only a specific isotope (48Ca). The laser is irradiated perpendicular to the collimated calcium vapor beam. Only 48Ca atoms are separated by deflecting them from the original atomic beam by momentum transfer due to multiple absorption and emission of laser photons. The isotope separation is confirmed by irradiating an ionization laser and time-of-flight measurement. Following the success of the proof-of-principle experiment, we are now developing the mass production system which include efficient generation of atomic beams, frequency-stabilized high-power laser, efficient laser irradiation method, and collection method of deflected isotope beams. In this paper, we report on the status and prospects of these developments.

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“…Different approaches are adopted to obtain the few hundreds of mW typically required for such cooling: laser diodes, a technologically simple solution, which can combine moderate power and narrow linewidth but requires optical injection of one or more slave modules [4]; single-pass second-harmonic (SH) generation with a bulk crystal [5], which can achieve high power, while doubling the source linewidth but only with large input power; SH generation exploiting a travelling-wave cavity [6,7], commonly folded in a bow-tie configuration for compactness. The latter configuration, which is widely adopted commercially [8,9], offers high power and narrow linewidth at the price of a complex alignment procedure and a high sensitivity to vibration noise and optical losses.…”

Section: Introductionmentioning

confidence: 99%

High power continuous laser at 461 nm based on a compact and high-efficiency frequency-doubling linear cavity

Feng,

Vidal,

Robert

et al. 2021

Preprint

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A Watt-level continuous and single frequency blue laser at 461 nm is obtained by frequency-doubling an amplified diode laser operating at 922 nm via a LBO crystal in a resonant Fabry-Pérot cavity. We achieved a best optical conversion efficiency equal to 87% with more than 1 W output power in the blue, and limited by the available input power. The frequency-converted beam is characterized in terms of long term power stability, residual intensity noise, and geometrical shape. The blue beam has a linewidth of the order of 1 MHz, and we used it to magneto-optically trap 88 Sr atoms on the 5s 2 1 S 0 -5s5p 1 P 1 transition. The low-finesse, linear-cavity doubling system is very robust, insensitive to vibrations, and is compatible with a tenfold increase of the power levels which could be obtained with fully-fibered amplifiers and large mode area fibers.

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Injection locking of a low cost high power laser diode at 461 nm

Cited by 20 publications

References 15 publications

Comparison between 403 nm and 497 nm repumping schemes for strontium magneto-optical traps

Comparison between 403 nm and 497 nm repumping schemes for strontium magneto-optical traps

Development of the laser isotope separation method to study for the neutrino-less double beta decay of ⁴⁸Ca

High power continuous laser at 461 nm based on a compact and high-efficiency frequency-doubling linear cavity

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Injection locking of a low cost high power laser diode at 461 nm

Cited by 20 publications

References 15 publications

Comparison between 403 nm and 497 nm repumping schemes for strontium magneto-optical traps

Comparison between 403 nm and 497 nm repumping schemes for strontium magneto-optical traps

Development of the laser isotope separation method to study for the neutrino-less double beta decay of 48Ca

High power continuous laser at 461 nm based on a compact and high-efficiency frequency-doubling linear cavity

Contact Info

Product

Resources

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Development of the laser isotope separation method to study for the neutrino-less double beta decay of ⁴⁸Ca