Highly efficient and high-power composite lasers by use of room-temperature bonding

2020 Fiscal Year Final Research Report

• Project/Area Number: 17K05081
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Optical engineering, Photon science
• Research Institution: Chuo University
• Principal Investigator: SHOJI Ichiro 中央大学, 理工学部, 教授 (90272385)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Keywords: 複合構造レーザー / 常温接合

Outline of Final Research Achievements

We succeeded in developing high-performance composite lasers comprising a laser crystal and a diamond crystal which has large thermal conductivity. We realized the structure which has a anti-reflection coating layer at the bonded interface by using the room-temperature-bonding technique. Efficient removal of heat from the laser crystal to the diamond enabled 1.5 times increase of the laser output power compared with a non-composite laser crystal. Moreover, 1.3 times higher efficiency as well as 1.2 times higher output power were obtained compared with a composite laser which does not have the coating layer at the bonded interface.

Free Research Field

光工学、光量子科学

Academic Significance and Societal Importance of the Research Achievements

高出力レーザーは基礎研究のみならず，産業や医療等幅広い分野でますます必要となっている．本研究で得られた成果は，小型で実用性が高いながらも大きな出力が得られるレーザーを今後実現するうえで意義が大きい．また，レーザー分野に限らず，異種材料の複合化によって新たな機能を発現する材料・デバイスの研究が精力的に行われている．本研究では，材料同士を原子レベルで接合し，かつ，光学特性を制御するためのコーティング層を挿入したデバイスが作製可能であることを初めて実証できた．