Inoue Takuya, Yoshida Masahiro, Gelleta John, Izumi Koki, Yoshida Keisuke, Ishizaki Kenji, De Zoysa Menaka, Noda Susumu
Photonics and Electronics Science and Engineering Center, Kyoto University, Kyoto, 615-8510, Japan.
Department of Electronic Science and Engineering, Kyoto University, Kyoto, 615-8510, Japan.
Nat Commun. 2022 Jul 4;13(1):3262. doi: 10.1038/s41467-022-30910-7.
Realization of one-chip, ultra-large-area, coherent semiconductor lasers has been one of the ultimate goals of laser physics and photonics for decades. Surface-emitting lasers with two-dimensional photonic crystal resonators, referred to as photonic-crystal surface-emitting lasers (PCSELs), are expected to show promise for this purpose. However, neither the general conditions nor the concrete photonic crystal structures to realize 100-W-to-1-kW-class single-mode operation in PCSELs have yet to be clarified. Here, we analytically derive the general conditions for ultra-large-area (3~10 mm) single-mode operation in PCSELs. By considering not only the Hermitian but also the non-Hermitian optical couplings inside PCSELs, we mathematically derive the complex eigenfrequencies of the four photonic bands around the Γ point as well as the radiation constant difference between the fundamental and higher-order modes in a finite-size device. We then reveal concrete photonic crystal structures which allow the control of both Hermitian and non-Hermitian coupling coefficients to achieve 100-W-to-1-kW-class single-mode lasing.
几十年来，实现单片超大面积相干半导体激光器一直是激光物理学和光子学的最终目标之一。具有二维光子晶体谐振器的表面发射激光器，即光子晶体表面发射激光器（PCSEL），有望实现这一目标。然而，实现PCSEL中100瓦至1千瓦级单模运行的一般条件和具体光子晶体结构尚未明确。在此，我们通过分析得出了PCSEL中超大面积（3~10毫米）单模运行的一般条件。通过不仅考虑PCSEL内部的厄米光学耦合，还考虑非厄米光学耦合，我们从数学上推导出了Γ点周围四个光子带的复本征频率，以及有限尺寸器件中基模和高阶模之间的辐射常数差。然后，我们揭示了具体的光子晶体结构，这些结构可以控制厄米和非厄米耦合系数，以实现100瓦至1千瓦级的单模激光发射。
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