This paper reports on the power scalability of 1.55-μm-wavelength photonic crystal surface emitting lasers (PCSELs) utilizing the design flexibility of the double-lattice photonic crystal. By controlling in-plane optical coupling, we have achieved single-mode continuous-wave lasing with various device sizes ranging from 100 μm to 300 μm in diameter. The output power exceeds 500 mW for a device size of 300 μm, and wall-plug efficiencies of all fabricated devices exceed 18%. Highly stable single-mode lasing with a side-mode suppression ratio over 60 dB is obtained even at the maximum output powers. Narrow circular beams are obtained, and the divergence angles decrease with increasing device size, ranging from 0.55 degrees to 0.23 degrees in FWHM for device sizes from 100 μm and 300 μm, respectively.
{"title":"Power Scalability of 1.55-μm-Wavelength InP-Based Double-Lattice Photonic-Crystal Surface-Emitting Lasers With Stable Continuous-Wave Single-Mode Lasing","authors":"Yuhki Itoh;Takeshi Aoki;Kosuke Fujii;Hiroyuki Yoshinaga;Naoki Fujiwara;Makoto Ogasawara;Yusuke Sawada;Rei Tanaka;Kenichi Machinaga;Hideki Yagi;Masaki Yanagisawa;Masahiro Yoshida;Takuya Inoue;Menaka De Zoysa;Kenji Ishizaki;Susumu Noda","doi":"10.1109/JSTQE.2024.3454202","DOIUrl":"10.1109/JSTQE.2024.3454202","url":null,"abstract":"This paper reports on the power scalability of 1.55-μm-wavelength photonic crystal surface emitting lasers (PCSELs) utilizing the design flexibility of the double-lattice photonic crystal. By controlling in-plane optical coupling, we have achieved single-mode continuous-wave lasing with various device sizes ranging from 100 μm to 300 μm in diameter. The output power exceeds 500 mW for a device size of 300 μm, and wall-plug efficiencies of all fabricated devices exceed 18%. Highly stable single-mode lasing with a side-mode suppression ratio over 60 dB is obtained even at the maximum output powers. Narrow circular beams are obtained, and the divergence angles decrease with increasing device size, ranging from 0.55 degrees to 0.23 degrees in FWHM for device sizes from 100 μm and 300 μm, respectively.","PeriodicalId":13094,"journal":{"name":"IEEE Journal of Selected Topics in Quantum Electronics","volume":"31 2: Pwr. and Effic. Scaling in Semiconductor Lasers","pages":"1-8"},"PeriodicalIF":4.3,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142198910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For LiDAR applications, compact, robust, and mass-producible light sources generating high-peak power nanosecond-long pulses are essential. This paper presents an investigation of power scaling in semiconductor lasers via the number of epitaxially stacked active regions in a single vertical waveguide supporting a higher order mode, chip length, output aperture width, and lateral waveguide design. All devices are wavelength-stabilized using surface gratings integrated either as a passive section at the rear facet of the diode laser as a distributed-Bragg-reflector (DBR) or along the full length of the chip in a distributed feedback (DFB) design. A 4 mm long broad-area (BA) DBR laser with a stripe width of 200 μm and five active regions delivered approximately 171 W at 80 A, a factor of 6.6 more peak pulse power than the standard 6 mm long single active region DBR laser with 50 μm stripe width. A corresponding 3 mm long 3-active region DFB-BA laser achieved more than 125 W at 129 A. These BA lasers have a lateral beam propagation ratio M $^{2}approx$