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成果報告書詳細
管理番号20180000000188
タイトル*平成29年度中間年報 高輝度・高効率次世代レーザー技術開発 次々世代加工に向けた新規光源・要素技術開発 革新的小型・高効率UVレーザー光源の開発
公開日2018/6/26
報告書年度2017 - 2017
委託先名株式会社金門光波 学校法人千葉工業大学 公益財団法人レーザー技術総合研究所
プロジェクト番号P16011
部署名IoT推進部
和文要約
英文要約Title: Development of advanced laser processing with intelligence based on high-brightness and high-efficiency next-generation laser technologies (TACMI project) / Development of compact and high-efficiency UV laser system (FY2016-FY2020) FY2017 Annual Report

A compact and high efficient UV laser system will be developed in this project. The concept of the new UV system is that we make a continuous wave UV (CW-UV) laser source by SHG technique with a primary visible fiber laser. The primary visible fiber laser is oscillated in a Pr-doped waterproof fluoride glass fiber (Pr:WPFGF). In this system, we use the SHG technique for generating UV laser only once, therefore, the CW-UV laser source is expected to be higher conversion efficiency than the previous systems because they use the THG or FHG technique with twice conversion process.
This project is aiming to develop a CW-UV power laser of 2W. We developed following items this year.

1) High-power primary visible fiber laser
We demonstrated a single-mode laser oscillation at 638 nm. The laser power was measured to be 1,044mW. In order to improve the laser power, we newly designed an efficient fiber cooling structure by considering heat elimination, and developed an optically tough fiber end surfaces for laser irradiation. These attempts can help us to improve the fundamental laser power.

2) Large core double-clad structured Pr:WPFGF
A double-clad structured optical fiber is an essential item for high power fiber laser. We fabricated a large core double-clad structured Pr:WPFGF, which had a core of 9.8-μm diameter and NA of 0.04. The fiber NA was designed sufficiently low to get single-mode output.

3) High-power mirror coating
In order to improve the damage resistance of optical coatings, we reconsidered coating conditions precisely, such as thermal history and position or fixing method of fiber houses in coating chamber. As results, the optical coating with 1.6 times higher optical resistance than the previous coatings.

4) High efficient external SHG cavity
We designed an external cavity resonator for UV generation with SHG technique. The cavity stability is kept by Hänsch-Couillaud method with feedback piezo electric system. A suitable piezo element and the driver were carefully evaluated and selected. We accomplished the cavity locking test by Haensch-Couillaud method and now applying the stabilization system to the UV generation cavity.
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