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公开(公告)号：US12222484B2
公开(公告)日：2025-02-11
申请号：US17673959
申请日：2022-02-17
Applicant: TOPTICA Photonics AG
Inventor： Christian Rausch , Alf Rieckmann , Manfred Hager , Jörg Lembach
Abstract: The invention relates to an illumination device, in particular for a confocal microscope. The object of the invention is to provide an illumination device which operates with a plurality of current-modulated semiconductor-based light sources, in which the light emission is as free as possible from distortions due to dynamic delays of the light emission in the output beam. To this end, the proposed illumination device comprises: two or more semiconductor-based light sources, in particular laser diodes, which are designed to emit light at different wavelengths, a combining unit, which is designed to combine the light emissions of the light sources into a single output light beam, and a driver unit connected to the light sources, which driver unit is designed to synthesise an operating current signal, which is supplied to each of the light sources, from at least one control signal, which specifies the temporal course of the light emission of each of the light sources, by means of digital signal processing, wherein the driver unit impresses a compensation signal on each of the operating current signals, which compensation signal at least partially compensates for a specific dynamic delay of the light emission of the particular light source.
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公开(公告)号：US20170047705A1
公开(公告)日：2017-02-16
申请号：US15237379
申请日：2016-08-15
Applicant: TOPTICA Photonics AG
Inventor： Christian Rausch , Andreas Brodschelm , Nico Vieweg , Thomas A. Puppe
CPC classification number: H01S3/1305 , H01S3/067 , H01S3/09 , H01S3/10046 , H01S3/10053 , H01S3/1053 , H01S3/1112 , H01S3/1118 , H01S3/1121 , H01S3/1307 , H01S3/136 , H01S3/1394 , H01S3/2383
Abstract: The invention relates to an apparatus for generating temporally spaced apart light pulses, comprising a first laser (11) which generates a first sequence (I) of light pulses at a first repetition rate, a second laser (12) which generates a second sequence (II) of light pulses at a second repetition rate, and at least one actuating member which influences the first repetition rate and/or the second repetition rate. It is an object of the invention to provide an apparatus for generating temporally spaced apart light pulses which is improved in relation to the prior art. This object is achieved by the invention by a control element (23) which applies a periodic modulation signal (24) to the actuating member for periodic variation of the first repetition rate and/or the second repetition rate, wherein the actuating member comprises a mechanical oscillator excited by the modulation signal (24), the deflection of said oscillator causing an adjustment in the resonator length of the first laser (11) and/or second laser (12), wherein the mechanical oscillator oscillates in resonant fashion at the frequency of the modulation signal (24). In accordance with the invention, an actuator (e.g. a piezo-actuator) which adjusts the resonator length of the laser is operated in resonant fashion. As a result, a large maximum time offset of the light-pulse sequences (I, II) with, at the same time, a high scanning speed is rendered possible. Moreover, the invention relates to a method for generating temporally spaced apart light pulses.
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公开(公告)号：US12228505B2
公开(公告)日：2025-02-18
申请号：US17342632
申请日：2021-06-09
Applicant: TOPTICA Photonics AG
Inventor： Thomas A. Puppe , Nico Vieweg , Christian Rausch
IPC: G01N21/3581
Abstract: The invention relates to a device for generating temporally spaced light pulses. Said device comprises a first light source which emits a first train of light pulses, a second light source which emits a second train of light pulses, and a phase-locked loop which regulates the relative phase of the light-pulse trains towards a target value. When the two light-pulse trains each pass through an optical transmission path to an application site that is spatially remote from the light sources, fluctuating phase differences in the light-pulse trains at the application site occur due to external influences along the transmission paths. The object of the invention is to provide an improved device for generating temporally spaced light pulses. In particular, the above-mentioned fluctuating phase differences are intended to be prevented. To do this, the invention proposes a detection apparatus that interacts with the phase-locked loop and detects a phase difference in the light-pulse trains at the application site caused by propagation-time differences along the transmission paths. In particular, the phase difference in the light-pulse trains at the application site is derived from light pulses that are reflected from the application site and pass through the transmission paths in the return direction. The detected phase difference can then be compensated for by the existing regulation of the relative phase of the light-pulse trains. In addition, the invention relates to a method for generating temporally spaced light pulses.
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公开(公告)号：US09711935B2
公开(公告)日：2017-07-18
申请号：US15237379
申请日：2016-08-15
Applicant: TOPTICA Photonics AG
Inventor： Christian Rausch , Andreas Brodschelm , Nico Vieweg , Thomas A. Puppe
CPC classification number: H01S3/1305 , H01S3/067 , H01S3/09 , H01S3/10046 , H01S3/10053 , H01S3/1053 , H01S3/1112 , H01S3/1118 , H01S3/1121 , H01S3/1307 , H01S3/136 , H01S3/1394 , H01S3/2383
Abstract: The invention relates to an apparatus for generating temporally spaced apart light pulses, comprising a first laser (11) which generates a first sequence (I) of light pulses at a first repetition rate, a second laser (12) which generates a second sequence (II) of light pulses at a second repetition rate, and at least one actuating member which influences the first repetition rate and/or the second repetition rate. It is an object of the invention to provide an apparatus for generating temporally spaced apart light pulses which is improved in relation to the prior art. This object is achieved by the invention by a control element (23) which applies a periodic modulation signal (24) to the actuating member for periodic variation of the first repetition rate and/or the second repetition rate, wherein the actuating member comprises a mechanical oscillator excited by the modulation signal (24), the deflection of said oscillator causing an adjustment in the resonator length of the first laser (11) and/or second laser (12), wherein the mechanical oscillator oscillates in resonant fashion at the frequency of the modulation signal (24). In accordance with the invention, an actuator (e.g. a piezo-actuator) which adjusts the resonator length of the laser is operated in resonant fashion. As a result, a large maximum time offset of the light-pulse sequences (I, II) with, at the same time, a high scanning speed is rendered possible. Moreover, the invention relates to a method for generating temporally spaced apart light pulses.
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