Phase-locked taper array for mid-infrared quantum cascade lasers with Talbot cavities

Shiya Zhang; Lianqing Zhu; Mingyu Li; Rui Wang; Jintao Cui

doi:10.1117/12.3032520

13 September 2024 Phase-locked taper array for mid-infrared quantum cascade lasers with Talbot cavities

Shiya Zhang, Lianqing Zhu, Mingyu Li, Rui Wang, Jintao Cui

Proceedings Volume 13178, Eleventh International Symposium on Precision Mechanical Measurements; 131780X (2024) https://doi.org/10.1117/12.3032520
Event: Eleventh International Symposium on Precision Mechanical Measurements, 2023, Guangzhou, China

Abstract

Power scaling in large-area quantum cascade lasers (QCLs) often leads to a degradation of beam quality and the emission of multi-lobed far-field patterns. In this study, we present a tapered QCL array featuring an integrated Talbot cavity on one side of the array, employing a diffraction coupling scheme. By controlling the Talbot length to one-half the Talbot distance (Zt/2), phase mode operation can be selectively achieved. Optimized in-phase mode operation is attained through careful adjustment of the Talbot cavity length. The far-field radiation pattern for in-phase operation comprises five lobes, with a central maximum lobe exhibiting a half-maximum width of 4.8°, accompanied by four side lobes. The separation between adjacent lobes measures approximately 14.3°. Ongoing research efforts are crucial to achieving enhanced beam performance and minimizing optical losses associated with integrated Talbot cavities.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Shiya Zhang, Lianqing Zhu, Mingyu Li, Rui Wang, and Jintao Cui "Phase-locked taper array for mid-infrared quantum cascade lasers with Talbot cavities", Proc. SPIE 13178, Eleventh International Symposium on Precision Mechanical Measurements, 131780X (13 September 2024); https://doi.org/10.1117/12.3032520

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