SURFACE EMITTING QUANTUM CASCADE LASER

• Main Authors: KANEKO, Kei, OHNO, Hiroshi, SUGIMOTO, Yoshimasa, KURODA, Takashi, IKEDA, Naoki, MANO, Takaaki, SAITO, Shinji, HASHIMOTO, Rei, YAO, Yuanzhao, KAKUNO, Tsutomu, SAKODA, Kazuaki
• Format: Patent
• Language: English; French; German
• Published: 19.04.2023
• Subjects: BASIC ELECTRIC ELEMENTS; DEVICES USING STIMULATED EMISSION; ELECTRICITY

An object of the present invention is to provide a novel surface emitting quantum cascade laser that is different from the conventional surface emitting quantum cascade laser and can realize the excellent beam quality as the surface emitting quantum cascade laser.Provided is a surface emitting quantum cascade laser, including: semiconductor layers other than a laser active layer and the laser active layer; and a square-lattice or rectangular-lattice photonic crystal on the laser active layer, wherein a unit lattice of the square-lattice or rectangular-lattice photonic crystal is made of a composition A, and a composition B having a refractive index different from a refractive index of the composition A, and wherein the composition A is a compound semiconductor composition or metal composition, the composition B is a compound semiconductor composition, and the unit lattice of the square-lattice or rectangular-lattice photonic crystal has the following structure: a columnar structure body having a pentagonal bottom face and being made of the composition B is provided in a central part of the columnar structure body having the square or rectangular bottom face and being made of the composition A.