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1. (WO2018224642) METHOD FOR MAINTAINING THE SYNCHRONISM OF A FOURIER DOMAIN MODE LOCKED (FDML) LASER
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Pub. No.: WO/2018/224642 International Application No.: PCT/EP2018/065138
Publication Date: 13.12.2018 International Filing Date: 08.06.2018
IPC:
H01S 3/137 (2006.01) ,H01S 3/139 (2006.01) ,H01S 3/08 (2006.01) ,H01S 3/106 (2006.01) ,H01S 3/13 (2006.01) ,H01S 3/00 (2006.01)
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
3
Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves
10
Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
13
Stabilisation of laser output parameters, e.g. frequency, amplitude
136
by controlling a device placed within the cavity
137
for stabilising of frequency
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
3
Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves
10
Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
13
Stabilisation of laser output parameters, e.g. frequency, amplitude
139
by controlling the mutual position or the reflecting properties of the reflectors of the cavity
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
3
Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves
05
Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
08
Construction or shape of optical resonators or components thereof
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
3
Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves
10
Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
106
by controlling a device placed within the cavity
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
3
Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves
10
Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
13
Stabilisation of laser output parameters, e.g. frequency, amplitude
H ELECTRICITY
01
BASIC ELECTRIC ELEMENTS
S
DEVICES USING STIMULATED EMISSION
3
Lasers, i.e. devices for generation, amplification, modulation, demodulation, or frequency-changing, using stimulated emission, of infra-red, visible, or ultra-violet waves
Applicants:
UNIVERSITÄT ZU LÜBECK [DE/DE]; Ratzeburger Allee 160 23538 Lübeck, DE
Inventors:
HUBER, Robert; DE
PFEIFFER, Tom; DE
Agent:
SCHMELCHER, Thilo; DE
Priority Data:
10 2017 209 739.609.06.2017DE
Title (EN) METHOD FOR MAINTAINING THE SYNCHRONISM OF A FOURIER DOMAIN MODE LOCKED (FDML) LASER
(FR) PROCÉDÉ PERMETTANT D'OBTENIR LE SYNCHRONISME D'UN LASER À MODES BLOQUÉS DANS LE DOMAINE DE FOURIER (FDML)
(DE) VERFAHREN ZUR ERHALTUNG DER SYNCHRONITÄT EINES FOURIER DOMAIN MODE LOCKED (FDML) LASERS
Abstract:
(EN) The invention relates to a method for maintaining the synchronism of a Fourier Domain Mode Locked (FDML) laser, the FDML laser comprising at least one dispersion-compensated resonator with at least one variably wavelength-selective optical filter, the laser light circulating in the resonator at a circulation frequency, and the wavelength selectivity of the filter being repeatedly modified at a syntonising rate, the FDML laser being synchronous when the syntonising rate is an integral multiple of the circulation frequency. Said method is characterised by the following steps: a) at least a portion of the laser light is coupled out of the resonator; b) at least a portion of the decoupled laser light is detected by means of a photodetector; c) amplitudes in the measuring signal of the photodetector are counted during successive counting intervals; and d) the circulation frequency or syntonising rate is adjusted such that the ratios of the count value to the lengths of the counting intervals are maintained within a predetermined nominal value interval.
(FR) L’invention concerne un procédé permettant d’obtenir le synchronisme d’un laser à modes bloqués dans le domaine de Fourier (FDML), le laser FDML présentant au moins un résonateur à compensation de la dispersion muni d’au moins un filtre optique variable sélectivement en longueur d’onde, la lumière laser tournant dans le résonateur à une fréquence de rotation et le filtre étant modifié à répétition à une vitesse de syntonisation quant à sa sélectivité en longueur d’onde, et le laser FDML étant synchrone lorsque la vitesse de syntonisation s’élève à un multiple entier de la fréquence de rotation. Le procédé est caractérisé par les étapes suivantes a. extraction d’au moins une partie de la lumière laser hors du résonateur ; b. détection d’au moins une partie de la lumière laser extraite au moyen d’au moins un photodétecteur ; c. comptage des déviations du signal de mesure du photodétecteur pendant des intervalles de comptage successifs ; d. régulation de la fréquence de rotation ou de la vitesse de syntonisation de telle manière que les rapports entre les valeurs de comptage et les longueurs des intervalles de comptage restent dans un intervalle théorique prédéfini.
(DE) Die Erfindung betrifft ein Verfahren zur Erhaltung der Synchronität eines Fourier Domain Mode Locked (FDML) Lasers, wobei der FDML Laser wenigstens einen dispersionskompensierten Resonator mit wenigstens einem veränderbar wellenlängenselektiven optischen Filter aufweist, wobei das Laserlicht im Resonator mit einer Umlauffrequenz umläuft und der Filter wiederholt mit einer Abstimmrate in seiner Wellenlängenselektivität verändert wird, wobei der FDML Laser synchron ist, wenn die Abstimmrate ein ganzzahliges Vielfaches der Umlauffrequenz beträgt, gekennzeichnet durch die Schritte a. Auskoppeln wenigstens eines Anteils des Laserlichts aus dem Resonator; b. Erfassen wenigstens eines Anteils des ausgekoppelten Laserlichts mit wenigstens einem Fotodetektor; c. Zählen von Ausschlägen im Messsignal des Fotodetektors während aufeinander folgender Zählzeitintervalle; d. Regeln von Umlauffrequenz oder Abstimmrate derart, dass die Verhältnisse der Zählwerte zu den Längen der Zählzeitintervalle in einem vorbestimmten Sollwertintervall gehalten werden.
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Designated States: AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW
African Regional Intellectual Property Organization (ARIPO) (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW)
Eurasian Patent Office (AM, AZ, BY, KG, KZ, RU, TJ, TM)
European Patent Office (EPO) (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG)
Publication Language: German (DE)
Filing Language: German (DE)