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Zhao, G., Hausmaninger, T., Ma, W. & Axner, O. (2018). Shot-noise-limited Doppler-broadened noise-immune cavity-enhanced optical heterodyne molecular spectrometry. Optics Letters, 43(4), 715-718
Open this publication in new window or tab >>Shot-noise-limited Doppler-broadened noise-immune cavity-enhanced optical heterodyne molecular spectrometry
2018 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 43, no 4, p. 715-718Article in journal (Refereed) Published
Abstract [en]

Shot-noise-limited Doppler-broadened (Db) noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) has been realized by implementation of balanced detection. A characterization of the system based on Allan-Werle plots of the absorption coefficient, retrieved by fitting a model function to data, shows that the system has a white noise equivalent absorption per unit length per square root of bandwidth of 2.3 x 10(-13) cm(-1) Hz(-1/2), solely 44% above the shot noise limit, and a detection sensitivity of 2.2 x 10(-14) cm(-1) over 200 s, both being unprecedented for Db NICE-OHMS. The white noise response follows the expected inverse square root dependence on power that is representative of a shot-noise-limited response, which confirms that the system is shot-noise-limited. 

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-145590 (URN)10.1364/OL.43.000715 (DOI)000425123700023 ()29444060 (PubMedID)
Funder
Swedish Research Council, 2015-04374
Available from: 2018-03-21 Created: 2018-03-21 Last updated: 2018-11-06Bibliographically approved
Tan, W., Qiu, X., Zhao, G., Jia, M., Ma, W., Yan, X., . . . Jia, S. (2017). High-efficiency frequency upconversion of 1.5 mu m laser based on a doubly resonant external ring cavity with a low finesse for signal field. Applied physics. B, Lasers and optics (Print), 123(2), Article ID 52.
Open this publication in new window or tab >>High-efficiency frequency upconversion of 1.5 mu m laser based on a doubly resonant external ring cavity with a low finesse for signal field
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2017 (English)In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 123, no 2, article id 52Article in journal (Refereed) Published
Abstract [en]

A doubly resonant external ring cavity with a low finesse for the signal field is used to improve the frequency upconversion efficiency of a weak 1583 nm signal laser to 636 nm by mixing with a resonance power enhanced 1064 nm pump laser in a 25 mm periodically poled lithium niobate crystal. The process of frequency upconversion is described and optimized by the doubly resonant cavity-enhanced sum frequency generation theory under the condition of undepleted pump approximation. By selecting the suitable reflectivity of the signal input mirror and the incident pump power, a cavity-enhanced frequency conversion efficiency of 94.6% was obtained for signal powers up to 25 mW with an input pump power of 780 mW.

National Category
Signal Processing
Identifiers
urn:nbn:se:umu:diva-133210 (URN)10.1007/s00340-016-6626-2 (DOI)000394290900001 ()
Available from: 2017-04-13 Created: 2017-04-13 Last updated: 2018-06-09Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1342-8597

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