Beam quality analysis of mid infrared tree-array quantum cascade lasers (QCLs) based on multi-mode interference (MMI) couplers and broad-area emitters

Luke Milbocker; Hong Shu; Dhruvkumar Desai; Guifang Li; Enrique Sanchez; Arkadiy Lyakh

doi:10.1117/12.2650037

15 March 2023 Beam quality analysis of mid infrared tree-array quantum cascade lasers (QCLs) based on multi-mode interference (MMI) couplers and broad-area emitters

Luke Milbocker, Hong Shu, Dhruvkumar Desai, Guifang Li, Enrique Sanchez, Arkadiy Lyakh

Author Affiliations +

Proceedings Volume 12440, Novel In-Plane Semiconductor Lasers XXII; 124400Q (2023) https://doi.org/10.1117/12.2650037
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

The beam quality of ridge-waveguide quantum cascade laser arrays with broad-area emitters and Multi-Mode Interference (MMI) couplers is investigated both experimentally and numerically. Previous demonstrations of MMI QCL arrays had narrow ridge waveguides to ensure fundamental mode operation and phase locking between elements of the array. In the interest of scaling optical power with lateral waveguide dimensions, we demonstrate broad area tree-arrays with MMI couplers at a wavelength of 4.65μm and ridge widths between 13 μm and 17μm. The emitted beams from the stem’s side are characterized with M2 measurements. We show that the MMI coupled arrays generally have significantly improved beam quality compared to Fabry Perot resonators with the same dimensions. Optimized tree-array devices will be the cornerstone of the next generation high power infrared systems.

Conference Presentation

Citation Download Citation

Luke Milbocker, Hong Shu, Dhruvkumar Desai, Guifang Li, Enrique Sanchez, and Arkadiy Lyakh "Beam quality analysis of mid infrared tree-array quantum cascade lasers (QCLs) based on multi-mode interference (MMI) couplers and broad-area emitters", Proc. SPIE 12440, Novel In-Plane Semiconductor Lasers XXII, 124400Q (15 March 2023); https://doi.org/10.1117/12.2650037

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