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成果報告書詳細
管理番号20170000000454
タイトル*平成28年度中間年報 国際研究開発・実証プロジェクト/コファンド事業 フランスBpifranceとの国際研究開発・実証事業 ライダー用可視・紫外レーザ光源の研究開発  
公開日2017/6/15
報告書年度2016 - 2016
委託先名株式会社オキサイド
プロジェクト番号P14005
部署名IoT推進部
和文要約
英文要約Title: Co-funding project/International research and development project between Bpifrance and NEDO/ Visible and ultraviolet pulsed fiber laser development for LIDAR system (FY2015-FY2017) FY2016 Annual report

1. Research and development of frequency convertor for small size and low cost green laser for LIDAR system
1-1 Research and development of frequency conversion device of small and high conversion efficiency
In this year, we fixed the design of PP-Mg:SLT device for SHG and fabricated them through mass production process.

1-2 Research and development of low cost frequency convertor
We designed frequency convertor for SHG with smaller size and low cost. We realized the convertor with approximately 50cc, which is one-third of the size comparing to the conventional one. We checked compatibility of the convertor for different fiber laser lots and confirmed their performances. All of the combination achieved more than 50% of conversion efficiency which is our target performance. Now we are continue to modify it to the convertor with TEC circuit board integrated design.

2. Research and development of frequency convertor for UV laser for LIDAR system
2-1 Research and development of frequency conversion material with high conversion efficiency for UV laser
We focused on LBGO and LBO crystals for UV generation. For LBGO we tried higher yield growth and larger diameter growth. For higher yield growth, we optimized the cooling rate at initial growth to enhance the speed of sidewise growth. As a result we succeeded to obtain longer range with effective diameter. For large diameter growth, we set up new furnace with lager diameter crucible. We have some troubles of crucible expansion because of large amount of raw melt. We are now planning to modify crucible structure to overcome this problem and trying larger size growth on FYI 2017. For LBO growth, we focus on high purity material based on top seeded solution growth technique. For high purity growth, since the melt has high viscosity, growth rate of the crystal is too slow. In order to optimize it, we tuned growth rate by changing cooling rate and found the maximum growth rate with keeping non-crack and non-inclusion qualities.

2-2 Research and development of frequency conversion device for UV laser
One of the candidate of UV generation is using SHG-THG monolithic PP-Mg:SLT device. By using this device structure, we can realize 2 conversion stages with one device and one temperature controller. We fabricate monolithic Fan-out PP-Mg:SLT device in order to phase match both SHG and THG condition easily. By using this device, we obtain more than 100 mW of 355 nm light from Keopsys’ fiber laser. However, the output beam shape was imperfect when average output power is more than 80mW. Then we optimize SHG/THG device length for monolithic device and found the mutual device length pair for 100mW output power without any beam distortion.
We also investigate PP-LBGO device fabrication for higher 355 nm and 266 nm generation device. We found optimum fabrication condition for 266nm device with 4um in periodicity and 0.5mm in thickness. We plan to check its performance on FYI 2017.

2-3 Research and development of frequency convertor for UV laser
We demonstrate 355 nm convertor by utilizing monolithic Fan-out PP-Mg:SLT based on the item 2-2. We succeeded to demonstrate 355 nm convertor with 125cc. We checked compatibility of the convertor for different fiber laser lots and confirmed their performances and obtained more than 80mW for all the fiber lasers. We plan to investigate modified 355nm and 266nm convertor on FY2016 to FY2017.
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