Magnetic domains driving a Q-switched laser

Morimoto, Ryohei; Goto, Taichi; Pritchard, John Paul; Takagi, Hiroyuki; Nakamura, Yūichi; Lim, Pang Boey; Uchida, Hironaga; Mina, Mani; Taira, Takunori; Inoue, M.

doi:10.1038/srep38679

Cited by 19 publications

(7 citation statements)

References 23 publications

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“…Magneto-optical (MO) interaction between light and a magnetized material is employed in photonics devices, which finally relates to sensing, − light modulation, or optical nonreciprocity. , Depending on the orientation of the magnetization compared to that of the light plane of incidence, these devices capitalize differently on MO interaction: through the modification of the light polarization for the Faraday effect in transmission and longitudinal/polar Kerr effect in reflection (L/PMOKE), or through light intensity modification for transverse Kerr effect (TMOKE) . Whatever the functionality, the development of efficient MO devices usually faces two difficulties.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Both Faraday and Kerr Effects with an All-Dielectric Grating Based on a Magneto-Optical Nanocomposite Material

et al. 2020

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We report on the design, fabrication, and characterization of an all-dielectric one-dimensional (1D) resonant device formed by a silicon nitride grating impregnated by a low-index magneto-optical silica-type matrix. This impregnation is realized through the dipping of the 966 nm periodic template in a sol−gel solution previously doped with CoFe 2 O 4 nanoparticles, and able to fill the grating slits. By a proper adjustment of the geometrical parameters of such a photonic crystal membrane, simultaneous excitation of transverse electric (TE) and transverse magnetic (TM) polarization resonances is nearly achieved at 1570 nm. This TE/TM phase-matching situation leads to a fivefold enhancement of the Faraday effect in the resonance area with an increased merit factor of 0.32°. Moreover, the device demonstrates its ability to enhance longitudinal and transverse Kerr effects for the other directions of the applied magnetic field. Taking benefits from the ability of the nanocomposite material to be processed on photonic platforms, and despite its quite low magneto-optical activity compared to classical magnetic materials, this work proves that an alldielectric 1D device can produce a high magneto-optical sensitivity to every magnetic field directions.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Both Faraday and Kerr Effects with an All-Dielectric Grating Based on a Magneto-Optical Nanocomposite Material

et al. 2020

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“…The MO Q-switch was inserted in the cavity. The RIG used in this study was the same 190-μm-thick film employed in our previous studies 16 , 17 , which was formed via a liquid-phase epitaxy method on a 560-μm-thick single-crystalline Gd 3 Ga 5 O 12 substrate. The composition of this film measured by energy-dispersive x-ray spectroscopy (JEOL, JED-2201F) was Tb 2.0 Bi 1.0 Fe 4.8 Ga 0.2 O 12–ξ , where ξ indicates the number of oxygen vacancies.…”

Section: Methodsmentioning

confidence: 99%

“…Previously, we proposed a magnetooptical (MO) Q-switch composed of a ferrimagnetic rare-earth substituted iron garnet (RIG) film and small coils 16 , 17 . Magnetic garnets are well known for their large MO effects and high transmittance in the near-infrared region 18 , 19 .…”

Section: Introductionmentioning

confidence: 99%

Randomly polarised beam produced by magnetooptically Q-switched laser

Morimoto

Goto

Taira

et al. 2017

Sci Rep

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Diode-pumped solid-state micro lasers are compact (centimetre-scale), highly stable, and efficient. Previously, we reported Q-switched lasers incorporating rare-earth substituted iron garnet (RIG) film. Here, the first demonstration of the magnetooptical (MO) Q-switch in an Nd:YAG laser cavity is performed. We fabricate a quasi-continuous-wave (QCW) diode-pumped Nd:YAG laser cavity, which is shortened to 10 mm in length and which contains an RIG film and a pair of small coils. This cavity yields a 1,064.58-nm-wavelength pulse with 25-ns duration and 1.1-kW peak power at a 1-kHz repetition ratio. Further, the polarisation state is random, due to the isotropic crystal structure of Nd:YAG and the fact that the MO Q-switch incorporating the RIG film does not require the presence of polarisers in the cavity. This is also the first report of an MO Q-switch producing random polarisation.Since their initial development, lasers have been implemented as irreplaceable components of various applications, e.g., mass spectrometers 1 , laser machining devices 2-5 , car ignition plugs 6,7 , satellite propulsion devices [8][9][10] , and medical equipment 11,12 . In particular, the Q-switching technique allows solid-state lasers to generate a short, high-powered pulse output [13][14][15] , which is crucial for the above applications.Previously, we proposed a magnetooptical (MO) Q-switch composed of a ferrimagnetic rare-earth substituted iron garnet (RIG) film and small coils 16,17 . Magnetic garnets are well known for their large MO effects and high transmittance in the near-infrared region 18,19 . However, although RIGs have potential use in optical applications such as two-dimensional integrated arrays 20 and storage media 21 , there are few reports of Q-switches employing these materials. In one of our previous studies, we demonstrated the MO Q-switch in a diode-pumped Nd:GdVO 4 laser system and showed the potential of this Q-switch, for which a notably compact system size was obtained (cavity length L: 10 mm). Note that such a small L is impossible using other active Q-switches, for example, electro-optic (EO) 22 and acousto-optic (AO) 23 Q-switches. EO Q-switches require a cubic polariser in the cavity and a high-voltage power supply for operation, whereas the AO module in an AO Q-switch cannot be made appropriately small to yield sufficient interaction and radio-frequency (RF) power supply for operation. Therefore, it is difficult to miniaturise L or the entire laser system for these Q-switches. As higher output photon densities can be achieved for Q-switched lasers with shorter length L 14,24 , diode-pumped solid-state micro lasers having L values of millimetre order are attracting interest.Although the compactness of the MO Q-switched laser incorporating RIG film was demonstrated previously, the output peak power remained small. Therefore, in this paper, a quasi-continuous-wave (QCW) 25,26 pumping technique using pulsed pumping light is employed to provide higher pump energy to the lasing material. In addition and for the...

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“…Магнитооптическое взаимодействие света с намагниченной средой используется в современных устройствах фотоники, а именно в сенсорах, в модуляторах света, в оптических изоляторах и т. д. [1][2][3][4][5][6][7]. Разработка эффективных магнитооптических устройств обычно сталкивается с двумя трудностями [1].…”

Section: Introductionunclassified

К Магнитооптике Холестерических Жидких Кристаллов

Геворгян¹,

Голик²

2021

Оптика И Спектроскопия

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Теоретически изучены особенности оптических свойств холестерических жидких кристаллов (ХЖК) во внешнем статическом магнитном поле с учетом магнитооптической активности. Рассмотрена граничная задача отражения от полупространства планарного ХЖК и прохождения света через конечный слой магнитоактивного ХЖК при нормальном падении света. Исследованы особенности эволюции отражения от полупространства при изменении параметра магнитооптической активности. Показано существование эффекта магнито-индуцированного пропускания (МИП) в ХЖК с реальными параметрами. Обсуждены особенности резонансных линии МИП при различных значениях локальной оптической анизотропии ХЖК. Ключевые слова: холестерические жидкие кристаллы, полуметаллы Вейля, гигантский магнитооптический параметр, дифракция, собственные поляризации, магнито-индуцированная прозрачность, оптическая анизотропия.

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Magnetic domains driving a Q-switched laser

Cited by 19 publications

References 23 publications

Enhancement of Both Faraday and Kerr Effects with an All-Dielectric Grating Based on a Magneto-Optical Nanocomposite Material

Enhancement of Both Faraday and Kerr Effects with an All-Dielectric Grating Based on a Magneto-Optical Nanocomposite Material

Randomly polarised beam produced by magnetooptically Q-switched laser

К Магнитооптике Холестерических Жидких Кристаллов

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