Cavity ringdown spectroscopy with swept-frequency laser

Brian John Orr (Inventor), Yabai He (Inventor)

Research output: Patent

Abstract

In a cavity ringdown spectrometer, a laser beam (12) is rapidly swept in frequency. When the frequency matches a resonant frequency of an optical cavity (20) formed between two highly reflective mirrors (16.1, 16.2) it is coupled into the cavity (20). Cavity-ringdown light is generated each time the frequency reaches a value that is resonant in the cavity. As the frequency reaches the value, the ringdown light builds up. As the frequency moves away from the value the ringdown light decays. A portion of the ringdown light is detected (38) and the rate of light decay is measured from the ringdown light signal. The variation of the rate of decay is attributable to a property of a sample that is in the cavity (20) between the mirrors (16.1; 16.2). A method of processing the ringdown light signal is also described. The arrangement allows rapid determination of the rates of decay of ringdown light at many frequencies for a single sample.

Original languageEnglish
Patent numberWO2005108939
IPCH01S 3/105 2006.1,G01J 3/433 2006.1,G01N 21/39 2006.1
Priority date12/05/04
Filing date12/05/05
Publication statusSubmitted - 17 Nov 2005

Bibliographical note

Designated States
AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BW, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KM, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NA, NG, NI, NO, NZ, OM, PG, PH, PL, PT, RO, RU, SC, SD, SE, SG, SK, SL, SM, SY, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, YU, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LS, MW, MZ, NA, SD, SL, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LT, LU, MC, NL, PL, PT, RO, SE, SI, SK, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)

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