A Composite Cavity for Mode Control in Broad-Area Diode Laser

A unstable cavity structure composed of the arc-shaped cavity, Fabry-Perot cavity, and sidewall saw-tooth microstructure is proposed to achieve mode selection in high-power broad-area diode laser with 980nm wavelength. In this cavity, the loss difference between the higher-order modes and the fundam...

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Veröffentlicht in:	IEEE photonics technology letters 2022-12, Vol.34 (24), p.1353-1356
Hauptverfasser:	Fan, Jian, Zhou, Xuyan, Fu, Ting, Chen, Jingxuan, Wang, Yufei, Qu, Hongwei, Qi, Aiyi, Zheng, Wanhua
Format:	Artikel
Sprache:	eng
Schlagworte:	beam quality Current density Fabry-Perot interferometers High power laser high-order mode Laser beams Laser modes Lasers Luminous intensity Measurement by laser beam Microstructure Modal choice mode control Near fields Semiconductor lasers
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Beschreibung
Zusammenfassung:	A unstable cavity structure composed of the arc-shaped cavity, Fabry-Perot cavity, and sidewall saw-tooth microstructure is proposed to achieve mode selection in high-power broad-area diode laser with 980nm wavelength. In this cavity, the loss difference between the higher-order modes and the fundamental mode is increased to suppress the lasing of higher-order modes. The lateral divergence is reduced by about 28%. The number of modes in the near-field spot is reduced and the light intensity is concentrated towards the center of the Near-field profile. Also, the lateral beam parameter product decreases by 15%.
ISSN:	1041-1135 1941-0174
DOI:	10.1109/LPT.2022.3215634