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KAKEN_25600118seika.pdf
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Title |
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結晶成長を利用した微小光共振器の作製に関する研究
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Kana |
ケッショウ セイチョウ オ リヨウシタ ビショウ ヒカリ キョウシンキ ノ サクセイ ニ カンスル ケンキュウ
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Kessho seicho o riyoshita bisho hikari kyoshinki no sakusei ni kansuru kenkyu
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Fabrication of microcavities using crystal growth
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田邉, 孝純
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タナベ, タカスミ
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Tanabe, Takasumi
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慶應義塾大学・理工学部・准教授
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Research team head
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科研費研究者番号 : 40393805
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2015
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科学研究費補助金研究成果報告書
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2014
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Abstract |
レーザ溶融ペデスタル法を用いてQ値16,000の微小光共振器の作製に成功した。Q値の制限要素が多角形化している共振器の断面形状にあることを突き止め, それを制御するためにプリヒーティング法と斜め成長を試みた。前者は種結晶をプリヒートすることで結晶性を低下させ, 後者は結晶の方位を選択して成長することで多角形形状化を防ぐ手法である。いずれの手法でも円形に近い断面形状の作製が可能となり, 手法の有効性が確認された。また, CaF2結晶共振器の非線形光学の研究を進め, 熱光学効果と熱膨張の相互作用によって, サイズが小さな場合, 光を入射するだけで機械的な振動を始め透過光も時間的に変調を受けることを明らかにした。
We demonstrated a Q of 16,000 with a small whispering gallery mode cavity fabricated with laser heated pedestal method. We found that the Q is limited when the cross-section of the microcavity is polygonal, and developed pre-heating and tilted crystal growth technique to overcome this problem. Pre-heating is performed in order to polycrystalline the seed crystal before starting the growth and allow the cavity to have circular shape. Tilted growth is also attractive because it may allow us to have circular cavity where the crystal structure is maintained. We also studied the optical nonlinearities in crystalline microcavity by using CaF2, and found that a thermo-mechanical oscillation occurs due to the interplay between the negative thermos optic effect and thermal expansion of the material. We found that the transmittance oscillates and this phenomena is pronounced for a smaller cavity.
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研究種目 : 挑戦的萌芽研究
研究期間 : 2013~2014
課題番号 : 25600118
研究分野 : 光エレクトロニクス
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Jul 29, 2019 | | 著者,抄録 内容,資源タイプ を変更 |
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