駆動電流変調による赤色半導体レーザのスペックル低減法

カテゴリ: 論文誌(論文単位)

グループ名: 【C】電子・情報・システム部門

発行日: 2020/02/01

タイトル(英語): Speckle Reduction by Driving Current Modulation for Red Semiconductor Laser Diodes

著者名: 西田　武弘（三菱電機（株）），藤原　康文（大阪大学大学院 工学研究科），山本　和久（大阪大学 レーザー科学研究所），小泉　淳（大阪大学大学院 工学研究科），八木　哲哉（三菱電機（株））

著者名(英語): Takehiro Nishida (Mitsubishi Electric Corporation, HF& Optical Device Works), Yasufumi Fujiwara (Graduate School of Engineering, Osaka University), Kazuhisa Yamamoto (Institute of Laser Engineering, Osaka University), Atsushi Koizumi (Graduate School of Engineering, Osaka University), Tetsuya Yagi (Mitsubishi Electric Corporation, HF& Optical Device Works)

キーワード: スペックル，赤色レーザ，電流変調　　speckle，red laser，current modulation

要約(英語): Speckle reduction method for laser diode based displays was newly proposed. The method was based on temporal change of the active layer temperature which could be controlled by optimizing the driving condition of the laser diode under pulse. The red LD consisted of AlGaInP has low thermal conductivity and small energy difference between the active layer and the cladding one in the conduction band, resulting in the large temporal change of the lasing spectrum under the adequate driving condition in pulse. It indicates the speckle contrast could be controlled by changing the condition. The speckle contrast dependence on the driving condition of the high-power 638-nm lateral single mode laser diode was experimentally studied. In the experiment, not only the conventional square waveform but also the saw one were used. The speckle contrast under the adequate conditions for both waveforms was reduced approximately 25% compared with that under CW. In particular, the saw one might be expected as a very robust driving condition for the speckle reduction. This can be used with other speckle reduction method such as moving screen, moving diffuser and so on. In this sense, the newly proposal may be the speckle reduction method for “last one mile”.

本誌: 電気学会論文誌C（電子・情報・システム部門誌） Vol.140 No.2 （2020）　特集：エネルギーデータを対象としたIoT，AI活用技術

本誌掲載ページ: 181-186 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejeiss/140/2/140_181/_article/-char/ja/