公开(公告)号：US20210247174A1

公开(公告)日：2021-08-12

申请号：US17260643

申请日：2019-07-19

申请人： OPTORES GMBH

发明人： Robert HUBER ,  Wolfgang DRAXINGER ,  Tom PFEIFFER

IPC分类号： G01B9/02

摘要： The invention relates to a method for monitoring time-dependent properties of light during scanning swept-source optical coherence tomography, having the steps: a. generating laser light having wavelengths that change on a time-dependent basis and a predetermined sweep duration; b. splitting the laser light into sample light, reference light, and monitor light; c. routing the reference light into a reference arm of an OCT interferometer; d. routing the monitor light into a monitor device, which generates at least one optical monitor signal representing at least one time-dependent property of the monitor light; e. generating at least one electric monitor signal from the at least one optical monitor signal with a light detector; f. illuminating in a point-shaped manner a sample with sample light, wherein the illumination point is guided on the surface of the sample along a predetermined trajectory; g. superimposing the light scattered by the sample with the reference light emerging from the reference arm on a light detector to generate an electric OCT signal; characterized in that h. the at least one electric monitor signal and the electric OCT signal are AD-converted in alternating sequence, in each case equidistantly in time, by means of which a single digital data stream comprising time segments each having only one of the AD-converted signals is formed.

公开(公告)号：US11262185B2

公开(公告)日：2022-03-01

申请号：US17260643

申请日：2019-07-19

申请人： OPTORES GMBH

发明人： Robert Huber ,  Wolfgang Draxinger ,  Tom Pfeiffer

IPC分类号： G01B9/02 ,  A61B3/10 ,  A61B5/00 ,  G01B9/02091 ,  G01B9/02004 ,  G01B9/02055

摘要： A method comprises: splitting laser light into sample light, reference light, and monitor light; routing the reference light into a reference arm of an OCT interferometer; routing the monitor light into a monitor device, which generates at least one optical monitor signal representing at least one time-dependent property of the monitor light; generating at least one electric monitor signal from the at least one optical monitor signal; illuminating in a point-shaped manner a sample with sample light, wherein the illumination point is guided on the surface of the sample along a predetermined trajectory; superimposing the light scattered by the sample with the reference light emerging from the reference arm to generate an electric OCT signal; wherein the at least one electric monitor signal and the electric OCT signal are AD-converted in alternating sequence, in each case equidistantly in time, to form a single digital data stream.

公开(公告)号：US10910787B2

公开(公告)日：2021-02-02

申请号：US16620126

申请日：2018-06-08

申请人： OPTORES GMBH

发明人： Robert Huber ,  Tom Pfeiffer

IPC分类号： H01S3/08 ,  H01S3/106 ,  H01S3/11 ,  H01S3/13

摘要： 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.