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So, a high-precision temperature controller is indispensable in every WMS system. To eliminate wavelength drift influence and improve detection sensitivity and response speed, laser wavelength sometimes needs to be locked at the gas absorption center. In this study, we develop a temperature controller to an ultra-high stability level of 0.0005 \u00b0C, based on which a new laser wavelength locking strategy is proposed to successfully lock the laser wavelength at a CH4 absorption center of 1653.72 nm with a fluctuation of fewer than 19.7 MHz. For 500 ppm CH4 sample detection, the 1\u03c3 SNR is increased from 71.2 dB to 80.5 dB and the peak-to-peak uncertainty is improved from 1.95 ppm down to 0.17 ppm with the help of a locked laser wavelength. In addition, the wavelength-locked WMS also has the absolute advantage of fast response over a conventional wavelength-scanned WMS system.<\/jats:p>","DOI":"10.3390\/s23115107","type":"journal-article","created":{"date-parts":[[2023,5,27]],"date-time":"2023-05-27T16:18:43Z","timestamp":1685204323000},"page":"5107","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Ultra-Stable Temperature Controller-Based Laser Wavelength Locking for Improvement in WMS Methane Detection"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6820-9818","authenticated-orcid":false,"given":"Fupeng","family":"Wang","sequence":"first","affiliation":[{"name":"Faculty of Information Science and Engineering, Engineering Research Center of Advanced Marine Physical Instruments and Equipment, Ocean University of China, Qingdao 266100, China"},{"name":"State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jinghua","family":"Wu","sequence":"additional","affiliation":[{"name":"Faculty of Information Science and Engineering, Engineering Research Center of Advanced Marine Physical Instruments and Equipment, Ocean University of China, Qingdao 266100, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rui","family":"Liang","sequence":"additional","affiliation":[{"name":"Faculty of Information Science and Engineering, Engineering Research Center of Advanced Marine Physical Instruments and Equipment, Ocean University of China, Qingdao 266100, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9875-7500","authenticated-orcid":false,"given":"Qiang","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9499-6659","authenticated-orcid":false,"given":"Yubin","family":"Wei","sequence":"additional","affiliation":[{"name":"Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250102, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yaopeng","family":"Cheng","sequence":"additional","affiliation":[{"name":"Faculty of Information Science and Engineering, Engineering Research Center of Advanced Marine Physical Instruments and Equipment, Ocean University of China, Qingdao 266100, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8567-4044","authenticated-orcid":false,"given":"Qian","family":"Li","sequence":"additional","affiliation":[{"name":"Faculty of Information Science and Engineering, Engineering Research Center of Advanced Marine Physical Instruments and Equipment, Ocean University of China, Qingdao 266100, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Diansheng","family":"Cao","sequence":"additional","affiliation":[{"name":"Faculty of Information Science and Engineering, Engineering Research Center of Advanced Marine Physical Instruments and Equipment, Ocean University of China, Qingdao 266100, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5695-619X","authenticated-orcid":false,"given":"Qingsheng","family":"Xue","sequence":"additional","affiliation":[{"name":"Faculty of Information Science and Engineering, Engineering Research Center of Advanced Marine Physical Instruments and Equipment, Ocean University of China, Qingdao 266100, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,5,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"122001","DOI":"10.35848\/1347-4065\/ac2e67","article-title":"Offset-locking-based frequency stabilization of external cavity diode lasers for long-distance quantum communication","volume":"60","author":"Miyashita","year":"2021","journal-title":"Jpn. 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