Cavity ringdown spectroscopy with swept-frequency laser

Brian John Orr; Yabai He

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 language	English
Patent number	WO2005108939
IPC	H01S 3/105 2006.1,G01J 3/433 2006.1,G01N 21/39 2006.1
Priority date	12/05/04
Filing date	12/05/05
Publication status	Submitted - 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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title = "Cavity ringdown spectroscopy with swept-frequency laser",

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.",

author = "Orr, {Brian John} and Yabai He",

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); WO2005108939; H01S 3/105 2006.1,G01J 3/433 2006.1,G01N 21/39 2006.1",

year = "2005",

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type = "Patent",

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TY - PAT

T1 - Cavity ringdown spectroscopy with swept-frequency laser

AU - Orr, Brian John

AU - He, Yabai

N1 - 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)

PY - 2005/11/17

Y1 - 2005/11/17

N2 - 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.

AB - 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.

M3 - Patent

M1 - WO2005108939

Y2 - 2005/05/12

ER -

Cavity ringdown spectroscopy with swept-frequency laser

Abstract

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