{"title":"Coarsely scannable comb-locked ECDL with fixed local oscillator for CRDS measurement of CO line strength.","authors":"Yera Kim, Noh Soo Han, Jeong Sik Lim","doi":"10.1364/OE.534492","DOIUrl":null,"url":null,"abstract":"<p><p>This study introduces a simplified method for scanning the optical frequency of an external cavity diode laser (ECDL) locked to an optical frequency comb (OFC) with a repetition rate of 250 MHz. Previous techniques have often been intricate, especially when dealing with a task of comb-mode hopping. In contrast, our method simplifies the mode-hoping method by tuning the piezoelectric transducer (PZT) at a rate of frep/2, while keeping the diode current locked to a fixed-frequency local oscillator (LO) at frep/4. This approach provides a reasonable sampling interval suitable for spectroscopic measurements of gas lines, typically spanning a few gigahertz. Our demonstration effectively improved the noise level of the ringdown traces in cavity ringdown spectroscopy (CRDS), even when using a passively stabilized optical cavity. Additionally, we report the line strength of the <sup>12</sup>C<sup>16</sup>O R23 line, yielding results that closely align with previous research studies.</p>","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"32 23","pages":"40315-40325"},"PeriodicalIF":3.2000,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics express","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1364/OE.534492","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
This study introduces a simplified method for scanning the optical frequency of an external cavity diode laser (ECDL) locked to an optical frequency comb (OFC) with a repetition rate of 250 MHz. Previous techniques have often been intricate, especially when dealing with a task of comb-mode hopping. In contrast, our method simplifies the mode-hoping method by tuning the piezoelectric transducer (PZT) at a rate of frep/2, while keeping the diode current locked to a fixed-frequency local oscillator (LO) at frep/4. This approach provides a reasonable sampling interval suitable for spectroscopic measurements of gas lines, typically spanning a few gigahertz. Our demonstration effectively improved the noise level of the ringdown traces in cavity ringdown spectroscopy (CRDS), even when using a passively stabilized optical cavity. Additionally, we report the line strength of the 12C16O R23 line, yielding results that closely align with previous research studies.
期刊介绍：
Optics Express is the all-electronic, open access journal for optics providing rapid publication for peer-reviewed articles that emphasize scientific and technology innovations in all aspects of optics and photonics.
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