CN117119643B - Sweep frequency light source and sweep frequency optical coherence tomography system - Google Patents
Sweep frequency light source and sweep frequency optical coherence tomography system Download PDFInfo
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- CN117119643B CN117119643B CN202311360897.4A CN202311360897A CN117119643B CN 117119643 B CN117119643 B CN 117119643B CN 202311360897 A CN202311360897 A CN 202311360897A CN 117119643 B CN117119643 B CN 117119643B
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- 238000012014 optical coherence tomography Methods 0.000 title claims abstract description 24
- 230000003993 interaction Effects 0.000 claims description 18
- 230000003287 optical effect Effects 0.000 claims description 16
- 238000001228 spectrum Methods 0.000 claims description 11
- 230000003321 amplification Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 230000003595 spectral effect Effects 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 238000003384 imaging method Methods 0.000 abstract description 17
- 238000001914 filtration Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 208000002177 Cataract Diseases 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000004204 blood vessel Anatomy 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 210000003161 choroid Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 210000001525 retina Anatomy 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
Abstract
The invention discloses a sweep frequency light source and a sweep frequency optical coherence tomography system, wherein a wave band selection module in the sweep frequency light source is electrically connected with a drive control module and is used for outputting a wavelength selection signal and a power selection signal to the drive control module; the drive control module is electrically connected with the multiband sweep light output module and is used for outputting a wavelength control signal to the multiband sweep light output module according to the wavelength selection signal so that the multiband sweep light output module outputs target sweep light matched with the wavelength selection signal; and outputting a power control signal to the multi-band sweep light output module according to the power selection signal so as to control the power of the target sweep light to be matched with the power selection signal. By adopting the technical means, the wave band sweep light output module can be controlled to output target sweep light and the power of the target sweep light can be controlled to be matched with the power selection signal, so that the axial resolution and the imaging depth of the sweep optical coherence tomography system can be simultaneously improved.
Description
Technical Field
The invention relates to the technical field of sweep frequency light sources, in particular to a sweep frequency light source and a sweep frequency optical coherence tomography system.
Background
Swept-frequency light sources are the most critical components inside swept-frequency optical coherence tomography (Swept Source Optical Coherence Tomography, SS-OCT) systems. The performance parameters of the sweep frequency light source directly determine the imaging performance of the SS-OCT system, the sweep frequency bandwidth of the sweep frequency light source determines the axial resolution of the SS-OCT system, and the larger the sweep frequency bandwidth is, the larger the axial resolution of the system is, but the larger the sweep frequency bandwidth is, the shallower the imaging depth of the system is.
However, in practical applications, the swept bandwidth of the swept light source can only improve a certain performance of the SS-OCT system, such as imaging depth or axial resolution, if two performances are to be improved at the same time, one existing method is to reselect a filtering component, so as to improve the fineness of the filtering component and improve the maximum bandwidth of the filtering component, which is a very difficult and random problem for the current process technology, and another method is to select a Vertical-Cavity Surface Emitting Laser (VCSEL) with a narrow line width as an initial light source, and the characteristic of the narrow line width can deepen the imaging depth of the SS-OCT system, but because the gain bandwidth of a distributed bragg reflector (Distributed Bragg Reflection, DBR) and an active quantum well gain spectrum in a component of the VCSEL light source is limited, the output spectrum of the swept light source is narrower, so that the axial resolution of the SS-OCT system cannot be improved.
Therefore, it is necessary to simultaneously increase the axial resolution and imaging depth of the SS-OCT system.
Disclosure of Invention
The embodiment of the invention provides a sweep frequency light source and a sweep frequency optical coherence tomography system, which are used for simultaneously improving the axial resolution and the imaging depth of the sweep frequency optical coherence tomography system.
In a first aspect, an embodiment of the present invention provides a swept-frequency light source, including: the device comprises a wave band selection module, a driving control module and a multiband sweep frequency light output module; the wave band selection module is electrically connected with the drive control module and is used for outputting a wavelength selection signal and a power selection signal to the drive control module; the driving control module is electrically connected with the multiband sweep light output module and is used for outputting a wavelength control signal to the multiband sweep light output module according to the wavelength selection signal so that the multiband sweep light output module outputs target sweep light with at least one wavelength matched with the wavelength selection signal; and outputting a power control signal to the multiband sweep light output module according to the power selection signal so as to control the power of the target sweep light to be matched with the power selection signal.
Optionally, the driving control module includes: a wavelength driving unit and a power driving unit; the multiband sweep frequency light output module includes: a wavelength output unit and a power output unit; the wavelength driving unit is electrically connected with the wavelength output unit and is used for outputting a wavelength range driving signal according to the wavelength selection signal, and the wavelength output unit is used for outputting the target sweep light according to the wavelength range driving signal; the power driving unit is electrically connected with the power output unit and is used for outputting a power amplification driving signal according to the power selection signal, and the power output unit is used for adjusting the power of the target sweep frequency light according to the power amplification driving signal.
Optionally, the wavelength driving unit includes: a constant current subunit, a constant temperature subunit and a gain amplifying subunit; the constant current subunit and the constant temperature subunit are electrically connected with the gain amplifying subunit and are used for controlling the current and the temperature of the gain amplifying subunit so that the gain amplifying subunit outputs the wavelength range driving signal.
Optionally, the wavelength output unit includes: a plurality of sweep frequency light output subunits with different wave bands; the sweep-frequency light output subunit is used for emitting sweep-frequency light rays with a plurality of different wave bands; the power output unit is electrically connected with the sweep frequency light output subunit and is used for adjusting the power of the target sweep frequency light.
Optionally, the multiband sweep frequency light output module further includes: a coupling-out unit; the coupling output unit is electrically connected with the wavelength output unit and the power output unit respectively and is used for coupling at least two target sweep frequency light rays and outputting the target sweep frequency light rays to the power output unit.
Optionally, the band selection module includes: the device comprises a power supply unit, a power supply conversion unit, a control unit and an interaction unit; the power supply unit is used for providing an initial voltage; the power supply conversion unit is respectively and electrically connected with the power supply unit and the control unit and is used for converting the initial voltage into the voltage required by the control unit; the interaction unit is electrically connected with the control unit, and the control unit is used for determining target wavelength and target power according to the interaction instruction provided by the interaction unit.
Optionally, the band selection module further includes: a display unit; the display unit is electrically connected with the control unit and is used for displaying the target wavelength and the target power.
Optionally, the band selection module further includes: a protection unit; the protection unit is electrically connected with the control unit and is used for sending out an alarm signal when the band selection module is in an abnormal working state.
Optionally, the swept optical source further includes: a spectral output and feedback module; the spectrum output and feedback module is electrically connected with the multiband sweep frequency light output module and is used for receiving the target sweep frequency light and outputting the target sweep frequency light to an application end; the spectrum output and feedback module is further electrically connected with the band selection module and is used for feeding back the target sweep light to the band selection module, so that the band selection module judges whether the difference value between the wavelength of the target sweep light and the target wavelength meets a preset wavelength threshold or not and whether the difference value between the power of the sweep light and the target power meets a preset power threshold or not.
In a second aspect, embodiments of the present invention also provide a swept optical coherence tomography system including a swept optical source according to any one of the first aspects.
The technical scheme provided by the embodiment of the invention is that the sweep frequency light source comprises a wave band selection module, a driving control module and a multiband sweep frequency light output module; the wave band selection module can output a wavelength selection signal and a power selection signal to the drive control module; the drive control module is electrically connected with the multiband sweep light output module and is used for outputting a wavelength control signal to the multiband sweep light output module according to the wavelength selection signal so as to enable the multiband sweep light output module to output target sweep light with at least one wavelength matched with the wavelength selection signal; the drive control module can output a power control signal to the multi-band sweep light output module according to the power selection signal so as to control the power of the target sweep light to be matched with the power selection signal, so that the sweep light source can output the target sweep light with at least one wavelength, further, the requirements of different application scenes can be met, and in addition, the imaging depth and the axial resolution of the SS-OCT system can be simultaneously improved by controlling the output of the sweep light sources with different center wavelengths.
Drawings
Fig. 1 is a schematic structural diagram of a swept source according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another swept source according to an embodiment of the invention.
Fig. 3 is a schematic structural diagram of a band selection module according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of another swept source according to an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a schematic structural diagram of a swept source according to an embodiment of the present invention, as shown in fig. 1, where the swept source includes: the device comprises a wave band selection module 10, a driving control module 20 and a multiband sweep frequency light output module 30; the band selection module 10 is electrically connected with the drive control module 20, and is used for outputting a wavelength selection signal and a power selection signal to the drive control module 20; the driving control module 20 is electrically connected with the multiband swept light output module 30, and is configured to output a wavelength control signal to the multiband swept light output module 30 according to the wavelength selection signal, so that the multiband swept light output module 30 outputs a target swept light of at least one wavelength matched with the wavelength selection signal; the power control signal is output to the multi-band swept light output module 30 according to the power selection signal to control the power of the target swept light to match the power selection signal.
Specifically, the wavelength selection module 10 may output a wavelength selection signal, and further selectively output the swept light with different wavelengths in the multiband swept light output module 30 through the driving control module 20, that is, the wavelength selection module 10 may select a single wavelength band with different center wavelengths, any two wavelength bands, or even more than two wavelength bands according to application requirements, that is, the wavelength selection signal output by the wavelength selection module 10 may be a single wavelength selection signal, or two or more than two wavelength selection signals. The driving control module 20 can output a wavelength control signal to the multi-band sweep light output module 30 according to the wavelength selection signal, so that the multi-band sweep light output module 30 outputs a target sweep light with at least one wavelength matched with the wavelength selection signal, and the target sweep light can be used for detecting related application scenes. Exemplary, the application scenes of the sweep light rays with different center wavelengths are different, the 1060nm sweep light rays are suitable for ophthalmology, have high penetrability to retina (choroid layer), and have better treatment effect to patients with blurred eye medium (such as cataract); the 1310nm sweep light is suitable for anterior ocular segment imaging, dermatology, blood vessel or dentistry, etc.; the 1550nm sweep light is suitable for deeper imaging of bone structures, nondestructive detection in industry, optical fiber sensing and the like.
Specifically, the band selection module 10 may further output a power selection signal to the driving control module 20, and the driving control module 20 may output a power control signal to the multi-band swept light output module 30 according to the power selection signal, so as to control the power of the target swept light to match with the power selection signal. In other words, the band selection module 10 may select a driving frequency signal corresponding to the filtering component in the multi-band swept-frequency light output module 30, and the driving control module 20 changes the spectral value output by the filtering component by controlling the waveform shape of the driving frequency signal, so as to further improve the axial resolution or the imaging depth of the imaging system. That is, the higher axial resolution required by the imaging system can be met by increasing the spectral value; the deeper imaging depth required by the imaging system can also be met by lowering the spectral value.
Further, the multiband swept light output module 30 may output swept light of multiple wavelength bands, and the wavelength selection signals may respectively correspond to the swept light of different wavelength bands, where the wavelength selection signals output by the band selection module 10 implement the multiband swept light output module 30 to output the target swept light.
The sweep frequency light source provided by the embodiment of the invention can output the wavelength selection signal and the power selection signal to the driving control module through the wave band selection module; the drive control module is electrically connected with the multiband sweep light output module and is used for outputting a wavelength control signal to the multiband sweep light output module according to the wavelength selection signal so as to enable the multiband sweep light output module to output target sweep light with at least one wavelength matched with the wavelength selection signal; the drive control module can output a power control signal to the multi-band sweep light output module according to the power selection signal so as to control the power of the target sweep light to be matched with the power selection signal, so that the sweep light source can output the target sweep light with at least one wavelength, further, the requirements of different application scenes can be met, and in addition, the imaging depth and the axial resolution of the SS-OCT system can be simultaneously improved by controlling the output of the sweep light sources with different center wavelengths.
Optionally, fig. 2 is a schematic structural diagram of another swept source according to an embodiment of the invention, as shown in fig. 2, the driving control module 20 includes: a wavelength driving unit 201 and a power driving unit 202; the multiband swept-frequency optical output module 30 includes: a wavelength output unit 301 and a power output unit 302; the wavelength driving unit 201 is electrically connected with the wavelength output unit 301, and is used for outputting a wavelength range driving signal according to the wavelength selection signal, and the wavelength output unit 301 is used for outputting target sweep light according to the wavelength range driving signal; the power driving unit 202 is electrically connected to the power output unit 302, and is configured to output a power amplification driving signal according to the power selection signal, and the power output unit 302 is configured to adjust the power of the target swept optical line according to the power amplification driving signal.
Specifically, the wavelength driving unit 201 is electrically connected to the wavelength output unit 301, and is configured to output a wavelength range driving signal according to the wavelength selection signal, and the wavelength output unit 301 is configured to output the target swept light according to the wavelength range driving signal. It can be understood that the wavelength output unit 301 is provided with a filter element, so that filtering of the sweep light other than the target sweep light output by the wavelength output unit 301 can be achieved. For example, when the center wavelength outputted by the band selection module 10 is 1060nm, the wavelength selection signal corresponding to the center wavelength is outputted to the wavelength driving unit 201, and the wavelength driving unit 201 may output a wavelength range driving signal, that is, the wavelength range may be 1010nm to 1110nm, so that the wavelength driving unit 201 may combine the filter components in the wavelength output unit 301 to split the spectrum of each band in the wavelength range, that is, may output the light with different center wavelengths at different moments to form the swept light.
For example, the wavelength output unit 301 may emit light in the wavelength bands of 1060nm, 1310nm, and 1550nm, respectively. The swept light of three different wavebands can utilize the principle of direct tuning, that is, the wavelength driving unit 201 is used to generate an initial spontaneous emission spectrum, and after passing through the filter component in the wavelength output unit 301, light with a certain wavelength is output, and after passing through the ring resonator, the light is input to the wavelength driving unit 201. The wavelength driving unit 201 is matched with the filtering component to output laser with different central wavelengths, the wavelength range of the output laser is only generated in a transmission wavelength window of the filtering component, the instantaneous wavelength is directly determined by the filtering component, and the light with different central wavelengths is output at different moments to form sweep light.
Specifically, the power driving unit 202 is electrically connected to the power output unit 302, and is configured to output a power amplification driving signal according to the power selection signal, and the power output unit 302 is configured to adjust the power of the target swept light according to the power amplification driving signal. The power driving unit 202 may be understood as a power amplifying unit, and may output a power amplifying driving signal according to a power selecting signal output by the band selecting module 10, so as to determine a power amplifying coefficient, so that the power outputting unit 302 may adjust the power of the target swept light according to the power amplifying coefficient, so that on one hand, the accuracy of adjusting the power of the target swept light may be improved by the power driving unit 202, and on the other hand, the power of the target swept light may be adjusted to meet the requirements of different application ends, thereby improving the reliability and compatibility of the swept light source.
Further, with continued reference to fig. 2, the wavelength driving unit 201 includes: a constant current subunit 2011, a constant temperature subunit 2012, and a gain amplification subunit 2013; the constant current subunit 2011 and the constant temperature subunit 2012 are electrically connected to the gain amplifying subunit 2013, and are used for controlling the current and the temperature of the gain amplifying subunit 2013 so that the gain amplifying subunit 2013 outputs a wavelength range driving signal.
Specifically, the constant current subunit 2011 is used to control the working current of the gain amplifying subunit 2013, so that the gain amplifying subunit 2013 works normally, and the proper working current can be adjusted for different constant current subunits 2011. The constant current driving mode of the constant current subunit 2011 may be to control the driving current by using the feedback current. The constant current driving principle is that a reference voltage source provides an initial voltage for a constant current source driving module, a constant current subunit 2011 outputs a preset current for a gain amplifying subunit 2013 to work, a sampling resistor measures a feedback voltage to a comparator to compare with the initial voltage, and the output voltage is dynamically changed, so that the gain amplifying subunit 2013 is driven by the constant current source for a long time.
Specifically, the function of the thermostat 2012 is to control the operating temperature of the gain amplifier 2013 to be maintained at a constant operating temperature, and for different application scenarios, there are different operating temperature requirements, and the thermostat 2012 can adjust the appropriate operating temperature. The principle of maintaining the constant temperature of the constant temperature subunit 2012 is that the semiconductor refrigeration chip is used to control the temperature change, an initial temperature input amount is firstly set according to the performance parameter of the gain amplifying subunit 2013 and the stable working condition, the working temperature of the gain amplifying subunit 2013 is acquired in real time by using a high-precision temperature sensor and is compared with the initial temperature, the difference value of the two is amplified and input into a Proportional, integral and derivative (PID) controller, the PID controller performs uniform configuration processing on an error signal and then controls a semiconductor refrigeration chip (Thermoelectric cooler, TEC) driver, and the TEC driver performs driving control on the TEC chip inside the sweep frequency light source to realize the tuning of the working temperature so as to keep the gain amplifying subunit 2013 at the constant working temperature.
Further, with continued reference to fig. 2, the wavelength output unit 301 includes: a plurality of sweep light output subunits 3011 of different wavebands; the sweep-frequency light output subunit 3011 is used for emitting sweep-frequency light of a plurality of different wavebands; the power output unit 302 is electrically connected to the swept light output subunit 3011 for adjusting the power of the target swept light.
Specifically, the plurality of swept-beam output subunits 3011 are respectively configured to emit swept beams in different wavebands, and the swept beams are output to the power output unit 302. For example, the wavelength bands of the three different wavelength bands of the swept light output subunit 3011 may be 1060nm, 1310nm, 1550nm, and when the wavelength band of the target swept light is 1060nm, the power output unit 302 may adjust the power thereof so that the target swept light meets the requirements of different application ends.
It should be noted that, for convenience of description, fig. 2 only shows three sweep light output subunits 3011, and it is to be understood that the number of sweep light output subunits 3011 may be four or more, and the number of sweep light output subunits 3011 is not specifically limited in the embodiment of the present invention.
Optionally, with continued reference to fig. 2, the multi-band swept-frequency light output module 30 further includes: a coupling-out unit 303; the coupling output unit 303 is electrically connected to the wavelength output unit 301 and the power output unit 302, respectively, and is configured to couple and output at least two target sweep light beams to the power output unit 302.
For example, the wavelength bands emitted by the three different wavelength band swept light output subunit 3011 may be 1060nm, 1310nm, 1550nm, respectively. The band selection module 10 may select the swept light with different center wavelengths in the swept light output subunit 3011, and the result output by the multiband swept light output module 30 may be a single 1060nm swept light, a single 1310nm swept light, a single 1550nm swept light, a common output of 1060nm and 1310nm swept light, a common output of 1060nm and 1550nm swept light, a common output of 1310nm and 1550nm swept light, and a common output of three swept light with different center wavelengths of 1060nm, 1310nm and 1550nm. It can be understood that the band selection module 10 selects different wavelengths for outputting according to different requirements of different application scenarios, so that the problem that the swept light source in the prior art can only output the swept light of a single band can be solved. In addition, the coupling output unit 303 can couple and output at least two target sweep light to the power output unit 302, so that the coupling efficiency of the light can be improved, an output channel is provided for sweep light with different wavelengths, and the coupled light is output to the power output unit 302, so that the reliability of the sweep light source can be ensured, and the output efficiency of the light can be improved.
It will be appreciated that output channels of different center wavelengths may be integrated into the output unit 303, so that light of a single or multiple center wavelengths can pass through with low loss and then enter the application end.
Optionally, fig. 3 is a schematic structural diagram of a band selection module according to an embodiment of the present invention, and as shown in fig. 3, the band selection module 10 includes: a power supply unit 101, a power conversion unit 102, a control unit 103, and an interaction unit 104; the power supply unit 101 is configured to supply an initial voltage; the power conversion unit 102 is electrically connected with the power supply unit 101 and the control unit 103, and is used for converting an initial voltage into a voltage required by the control unit 103; the interaction unit 104 is electrically connected to the control unit 103, and the control unit 103 is configured to determine the target wavelength and the target power according to the interaction instruction provided by the interaction unit 104.
Specifically, the power supply unit 101 is configured to provide an initial voltage to ensure the normal operation of the swept optical source. The initial voltage may be, for example, 24V. Further, the power conversion unit 102 is electrically connected to the power supply unit 101 and the control unit 103, respectively, so that the power conversion unit 102 can convert the initial voltage provided by the power supply unit 101 into the voltage required by the control unit 103, so as to ensure the normal operation of the control unit 103. The power conversion unit 102 may convert an initial 24V voltage to ±12v, +5v, or +3.3v, for example.
Further, the interaction unit 104 is electrically connected to the control unit 103, where the interaction unit 104 may be a human-computer interaction unit, that is, a user sets an interaction instruction according to the use requirements of the SS-OCT in different application scenarios, so that the control unit 103 determines the target wavelength and the target power according to the interaction instruction provided by the interaction unit 104, and thus the use requirements of the user in different scenarios can be satisfied.
Optionally, with continued reference to fig. 3, the band selection module 10 further includes: a display unit 105; the display unit 105 is electrically connected to the control unit 103 for displaying the target wavelength and the target power.
Specifically, the display unit 105 may display the target wavelength and the target power, so that the user can check the setting condition of the current device, so as to determine the application scenario according to the band to be output by the current swept-frequency light source.
Illustratively, the display screen employs an organic light emitting display screen (Organic Electroluminescence Display, OLED) that may employ a self-contained word stock chip.
It will be appreciated that the display unit 105 may also display the current operating temperature of the band selection module 10, etc.
Optionally, with continued reference to fig. 3, the band selection module 10 further includes: a protection unit 106; the protection unit 106 is electrically connected to the control unit 103, and is configured to send out an alarm signal when the band selection module 10 is in an abnormal operation state.
Specifically, the protection unit 106 may send an alarm signal when an abnormality occurs in a device in the band selection module 10 or the working temperature of the band selection module 10 is at an abnormal value, so that a user can be warned to stop the output action of the target sweep light in time, so as to reduce the loss of the scanning light source.
Optionally, fig. 4 is a schematic structural diagram of another swept optical source according to an embodiment of the present invention, as shown in fig. 4, where the swept optical source further includes: a spectral output and feedback module 40; the spectrum output and feedback module 40 is electrically connected with the multiband swept light output module 30, and is configured to receive the target swept light and output the target swept light to the application end; the spectral output and feedback module 40 is further electrically connected to the band selection module 10, and is configured to feed back the target swept light to the band selection module 10, so that the band selection module 10 determines whether a difference between a wavelength of the target swept light and the target wavelength meets a preset wavelength threshold, and whether a difference between a power of the swept light and the target power meets a preset power threshold.
Specifically, the spectrum output and feedback module 40 can receive the target sweep light output by the multiband sweep light output module 30 and output the target sweep light to the application end, so that the application end can perform detection of the related field according to the target sweep light.
Further, when the band selection module 10 determines that the difference between the wavelength of the target swept light and the target wavelength does not exceed the preset wavelength threshold, and the difference between the power of the swept light and the target power does not exceed the preset power threshold, it is indicated that the swept light output by the spectrum output and feedback module 40 matches with the target wavelength and the target power, so that the target swept light can be further utilized to detect the relevant application scenario, so as to meet the user requirement. When the band selection module 10 determines that the difference between the wavelength of the target swept light and the target wavelength exceeds the preset wavelength threshold and the difference between the power of the swept light and the target power exceeds the preset power threshold, the spectrum output and feedback module 40 indicates that the swept light is not matched with the target wavelength and the target power, and then the user can be alerted to be prompted for relevant adjustment by the user. The power module and the power output module can adjust the power according to the difference value when the difference value between the power of the sweep frequency light and the target power exceeds the preset power threshold, so that the output power can be ensured to meet the use requirement of the application end.
In summary, the sweep frequency light source provided by the embodiment of the invention can output the wavelength selection signal and the power selection signal to the driving control module through the wave band selection module; the drive control module is electrically connected with the multiband sweep light output module and is used for outputting a wavelength control signal to the multiband sweep light output module according to the wavelength selection signal so as to enable the multiband sweep light output module to output target sweep light with at least one wavelength matched with the wavelength selection signal; the drive control module can output a power control signal to the multi-band sweep light output module according to the power selection signal so as to control the power of the target sweep light to be matched with the power selection signal, so that the sweep light source can output the target sweep light with at least one wavelength, further, the requirements of different application scenes can be met, and in addition, the imaging depth and the axial resolution of the SS-OCT system can be simultaneously improved by controlling the output of the sweep light sources with different center wavelengths.
Based on the same inventive concept, the embodiment of the present invention further provides a swept-frequency optical coherence tomography system, which includes the swept-frequency light source described in the foregoing embodiment, so that the swept-frequency optical coherence tomography system has the same beneficial effects, which are not described herein.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. A swept frequency light source, comprising: the device comprises a wave band selection module, a driving control module and a multiband sweep frequency light output module;
the wave band selection module is electrically connected with the drive control module and is used for outputting a wavelength selection signal and a power selection signal to the drive control module;
the driving control module is electrically connected with the multiband sweep light output module and is used for outputting a wavelength control signal to the multiband sweep light output module according to the wavelength selection signal so that the multiband sweep light output module outputs target sweep light with at least one wavelength matched with the wavelength selection signal; outputting a power control signal to the multiband sweep light output module according to the power selection signal so as to control the power of the target sweep light to be matched with the power selection signal;
wherein the drive control module includes: a wavelength driving unit and a power driving unit;
the multiband sweep frequency light output module includes: a wavelength output unit and a power output unit;
the wavelength driving unit is electrically connected with the wavelength output unit and is used for outputting a wavelength range driving signal according to the wavelength selection signal, and the wavelength output unit is used for outputting the target sweep light according to the wavelength range driving signal;
the power driving unit is electrically connected with the power output unit and is used for outputting a power amplification driving signal according to the power selection signal, and the power output unit is used for adjusting the power of the target sweep frequency light according to the power amplification driving signal;
wherein the wavelength driving unit includes: a constant current subunit, a constant temperature subunit and a gain amplifying subunit;
the constant current subunit and the constant temperature subunit are electrically connected with the gain amplifying subunit and are used for controlling the current and the temperature of the gain amplifying subunit so that the gain amplifying subunit outputs the wavelength range driving signal.
2. A swept optical source as claimed in claim 1, wherein the wavelength output unit comprises: a plurality of sweep frequency light output subunits with different wave bands;
the sweep-frequency light output subunit is used for emitting sweep-frequency light rays with a plurality of different wave bands;
the power output unit is electrically connected with the sweep frequency light output subunit and is used for adjusting the power of the target sweep frequency light.
3. The swept optical source of claim 1, wherein the multi-band swept optical line output module further comprises: a coupling-out unit;
the coupling output unit is electrically connected with the wavelength output unit and the power output unit respectively and is used for coupling at least two target sweep frequency light rays and outputting the target sweep frequency light rays to the power output unit.
4. A swept optical source as claimed in claim 1, wherein the band selection module comprises: the device comprises a power supply unit, a power supply conversion unit, a control unit and an interaction unit;
the power supply unit is used for providing an initial voltage;
the power supply conversion unit is respectively and electrically connected with the power supply unit and the control unit and is used for converting the initial voltage into the voltage required by the control unit;
the interaction unit is electrically connected with the control unit, and the control unit is used for determining target wavelength and target power according to the interaction instruction provided by the interaction unit.
5. A swept optical source as claimed in claim 4, wherein the band selection module further comprises: a display unit;
the display unit is electrically connected with the control unit and is used for displaying the target wavelength and the target power.
6. A swept optical source as claimed in claim 4, wherein the band selection module further comprises: a protection unit;
the protection unit is electrically connected with the control unit and is used for sending out an alarm signal when the band selection module is in an abnormal working state.
7. A swept optical source as claimed in claim 1, wherein the swept optical source further comprises: a spectral output and feedback module;
the spectrum output and feedback module is electrically connected with the multiband sweep frequency light output module and is used for receiving the target sweep frequency light and outputting the target sweep frequency light to an application end;
the spectrum output and feedback module is further electrically connected with the band selection module and is used for feeding back the target sweep light to the band selection module so that the band selection module can judge whether the difference between the wavelength of the target sweep light and the target wavelength meets a preset wavelength threshold or not, and
whether the difference value between the power of the sweep frequency light and the target power meets a preset power threshold or not.
8. A swept optical coherence tomography system comprising a swept optical source as claimed in any one of claims 1 to 7.
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|---|---|---|---|---|
| CN103427334A (en) * | 2012-05-14 | 2013-12-04 | 三星电子株式会社 | Method and apparatus for emitting wavelength-swept light |
| CN104755908A (en) * | 2012-07-27 | 2015-07-01 | 统雷有限公司 | Agile imaging system |
| CN107643248A (en) * | 2017-09-15 | 2018-01-30 | 电子科技大学 | A kind of adjustable swept light source of start wavelength and dutycycle based on multiple surface rotating mirror |
| JP2019114721A (en) * | 2017-12-25 | 2019-07-11 | 日本電信電話株式会社 | Wavelength sweeping light source |
| CN115963060A (en) * | 2021-10-13 | 2023-04-14 | 北京鉴知技术有限公司 | Swept-frequency laser, control method thereof and optical coherence tomography system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4191808A1 (en) * | 2016-12-09 | 2023-06-07 | Nippon Telegraph And Telephone Corporation | Swept light source and drive data generation method and optical deflector for swept light source |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427334A (en) * | 2012-05-14 | 2013-12-04 | 三星电子株式会社 | Method and apparatus for emitting wavelength-swept light |
| CN104755908A (en) * | 2012-07-27 | 2015-07-01 | 统雷有限公司 | Agile imaging system |
| CN107643248A (en) * | 2017-09-15 | 2018-01-30 | 电子科技大学 | A kind of adjustable swept light source of start wavelength and dutycycle based on multiple surface rotating mirror |
| JP2019114721A (en) * | 2017-12-25 | 2019-07-11 | 日本電信電話株式会社 | Wavelength sweeping light source |
| CN115963060A (en) * | 2021-10-13 | 2023-04-14 | 北京鉴知技术有限公司 | Swept-frequency laser, control method thereof and optical coherence tomography system |
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