Injection locking of a high power ultraviolet laser diode for laser cooling of ytterbium atoms

Hosoya, Toshiyuki; Miranda, Martin; Inoue, Ryotaro; Kozuma, Mikio

doi:10.1063/1.4927132

Cited by 21 publications

(18 citation statements)

References 31 publications

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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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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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“…In AMO applications, the seed laser frequency is typically fixed (for example, referenced to an atomic transition), and the secondary laser diode's current and temperature are varied to achieve injection locking. Some injection locked systems achieve passive stability, typically using high seed power 2 , but in many cases active stabilization is needed. Active stabilization relies on measuring the quality of the injection lock and adjusting the secondary diode laser parameters to maintain optimal injection locking.…”

Section: Introductionmentioning

confidence: 99%

Polarization purity for active stabilization of diode laser injection lock

Niederriter,

Van Der Put,

Hamilton

2021

Preprint

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Injection locking of diode lasers is commonly used to amplify low power laser light, but is extremely sensitive to perturbations in the laser current and temperature. To counter such perturbations, active stabilization is often applied to the current of the injection locked diode. We observe that the diode laser's polarization extinction ratio (PER) greatly increases when injection locked, and therefore the PER provides a measure of injection lock quality. We report robust active stabilization of a diode laser injection lock based on the PER, demonstrating the technique at 399 nm wavelength where injection locking is typically less stable than at longer wavelengths. The PER provides a feedback error signal that is compatible with standard PID servo controllers, requires no additional optical components beyond the optical isolator typically used in injection locking, and enables a large feedback bandwidth.

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“…Injection locking of a diode laser is essential in a majority of fields, such as laser spectroscopy [1,2], laser cooling and trapping [3][4][5][6][7][8], optical communication [9][10][11] and highprecision metrology [12][13][14][15]. It allows phase and frequency locking of a "slave" laser in reference to a "master" laser by an optical link [16].…”

Section: Introductionmentioning

confidence: 99%

Active control of a diode laser with injection locking

Chen¹,

Seo²,

Huang³

et al. 2021

Preprint

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We present a simple and effective method to implement an active stabilization of a diode laser with injection locking, which requires minimal user intervenes. The injection locked state of the diode laser is probed by a photodetector, of which sensitivity is enhanced by a narrow laser-line filter. Taking advantage of the characteristic response of laser power to spectral modes from the narrow laser-line filter, we demonstrate that high spectral purity and low intensity noise of the diode can be simultaneously maintained by an active feedback to the injected laser. Our method is intrinsically cost-effective, and does not require bulky devices, such as Fabry-Perot interferometers or wavemeters, to actively stabilize the diode laser. Based on successful implementation of this method in our quantum gas experiments, it is conceivable that our active stabilization will greatly simplify potential applications of injection locking of diode lasers in modularized or integrated optical systems.

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Injection locking of a high power ultraviolet laser diode for laser cooling of ytterbium atoms

Cited by 21 publications

References 31 publications

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

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

Polarization purity for active stabilization of diode laser injection lock

Active control of a diode laser with injection locking

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Injection locking of a high power ultraviolet laser diode for laser cooling of ytterbium atoms

Cited by 21 publications

References 31 publications

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

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

Polarization purity for active stabilization of diode laser injection lock

Active control of a diode laser with injection locking

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Product

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

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