CN215072365U - Laser driving device based on feedback design and laser emitting device - Google Patents
Laser driving device based on feedback design and laser emitting device Download PDFInfo
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Abstract
The utility model provides a laser instrument drive arrangement and laser emitter based on feedback design, the scheme includes clock circuit, phase discriminator, wave filter, voltage controlled oscillator, V/I converter, current source and the laser instrument that the order is connected, wherein, voltage controlled oscillator includes two way signal output, and signal input to the frequency divider all the way, another way signal input to voltage current converter, the oscillation frequency and the feedback after the frequency divider output frequency division give back to the phase discriminator. According to the scheme, a frequency and phase locking feedback loop is formed by a reference frequency signal through a PFD, a low-pass filter, a VCO and a frequency divider, so that a laser driving signal with high precision and high stability can be obtained; by inputting the laser driving signal into the laser, the frequency precision of the output light wave can be effectively ensured.
Description
Technical Field
The utility model relates to a laser instrument drives technical field, especially relates to a laser instrument drive arrangement and laser emission device based on feedback design.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the prior art, a laser driving circuit mainly uses a laser driving chip to convert an input power supply into a laser working power supply and directly output the laser working power supply to a laser so as to control the laser to work; under the current environment, laser is applied to various industries, and particularly in the field of medical cosmetology, laser is widely applied, however, the inventor finds that a laser applied in the field of medical cosmetology has strict requirements on the frequency precision of the laser, and the main factor influencing the frequency precision of light waves generated by the laser is a driving signal, and the precision and the stability of the driving signal in the prior art can not meet the requirements in the special field, so that personnel damage is caused due to the low precision of the frequency of the light waves generated by the laser.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, the present invention provides a laser driving device and a laser emitting apparatus based on feedback design, wherein a frequency and phase locking feedback loop is formed by passing a reference frequency signal through a PFD, a low pass filter, a VCO, and a frequency divider, so that a high-precision and high-stability laser driving signal can be obtained; by inputting the laser driving signal into the laser, the frequency precision of the output light wave can be effectively ensured.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a laser instrument drive arrangement based on feedback design, includes clock circuit, phase discriminator, wave filter, voltage controlled oscillator, V/I converter and the current source that the order is connected, wherein, voltage controlled oscillator includes two way signal output, and signal input to the frequency divider all the way, another way signal input to voltage current converter, the oscillation frequency after the frequency divider output frequency division feeds back to the phase discriminator.
Further, the phase detector receives a reference frequency signal generated by a clock circuit and an oscillation frequency fed back by the frequency divider, and outputs a tunable voltage to the filter.
Further, the filter receives the tunable voltage output by the phase discriminator and outputs the denoised tunable voltage to the voltage-controlled oscillator.
Further, the voltage-controlled oscillator receives the tunable voltage as a control signal and outputs a corresponding oscillation frequency.
Further, the current signal output by the V/I converter is used as an ac reference of the current source, and the current source outputs an ac current driving signal.
A laser emitting device comprises the laser driving device based on the feedback design and a laser.
Compared with the prior art, the beneficial effects of the utility model are that:
the scheme of the utility model provides a laser instrument drive device based on feedback design, the scheme is through forming frequency and phase locking feedback loop with reference frequency signal through PFD, low pass filter, VCO, frequency divider, can obtain the laser instrument drive signal of high accuracy high stability; by inputting the laser driving signal into the laser, the frequency precision of the output light wave can be effectively ensured, and a solid foundation is provided for the use of laser in the medical beauty industry.
Drawings
The accompanying drawings, which form a part of the specification, are provided to provide a further understanding of the invention, and are included to explain the illustrative embodiments and the description of the invention, and not to constitute a limitation of the invention.
Fig. 1 is a schematic structural diagram of a laser driving apparatus based on a feedback design according to a first embodiment of the present invention;
fig. 2 is a schematic structural view of a laser emitting device according to a second embodiment of the present invention.
The specific implementation mode is as follows:
the present invention will be further described with reference to the accompanying drawings and specific embodiments.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and may be fixedly connected, or may be integrally connected or detachably connected; may be directly connected or indirectly connected through an intermediate. The meaning of the above terms in the present invention can be determined according to specific situations by persons skilled in the art, and should not be construed as limiting the present invention.
The first embodiment is as follows:
it is an object of the present embodiment to provide a laser driving apparatus based on a feedback design.
The utility model provides a laser instrument drive arrangement based on feedback design, includes clock circuit, phase discriminator, wave filter, voltage controlled oscillator, V/I converter and the current source that the order is connected, wherein, voltage controlled oscillator includes two way signal output, and signal input to the frequency divider all the way, another way signal input to voltage current converter, the oscillation frequency after the frequency divider output frequency division feeds back to the phase discriminator.
Further, the phase detector receives a reference frequency signal generated by a clock circuit and an oscillation frequency fed back by the frequency divider, and outputs a tunable voltage to the filter.
Further, the filter receives the tunable voltage output by the phase discriminator and outputs the denoised tunable voltage to the voltage-controlled oscillator.
Further, the voltage-controlled oscillator receives the tunable voltage as a control signal and outputs a corresponding oscillation frequency.
Further, the filter adopts a Gaussian low-pass filter.
Further, the current signal output by the V/I converter is used as an ac reference of the current source, and the current source outputs an ac current driving signal.
Furthermore, the phase detector adopts an HMC984 phase frequency detector.
Specifically, for ease of understanding, the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings:
as shown in fig. 1, the driving apparatus of the present disclosure includes: a clock circuit, a phase detector (PFD), a low pass filter, a Voltage Controlled Oscillator (VCO), a frequency divider, a voltage to current converter, and a current source.
Wherein the clock circuit outputs a high stability clock as a reference frequency of the laser drive signal, denoted as frefAnd the output of the clock circuit is connected to the phase detector.
The phase detector compares the input reference frequency and phase with the feedback frequency and phase. When the comparison result is in a steady state, i.e., the frequency and phase of the feedback match the reference frequency and phase of the input, the frequency and phase may be considered to be locked; the phase detector output tunable voltage is connected to a low pass filter.
The low-pass filter is used for filtering high-frequency noise of the tunable voltage, plays a role in purifying a high-noise reference frequency signal, and is connected to the voltage-controlled oscillator in output.
The voltage-controlled oscillator controls the frequency of the output oscillation signal by using the voltage input. Oscillation frequency f of voltage controlled oscillator outputvcoWill vary with the input voltage.
The frequency divider is used for dividing the oscillation frequency output by the voltage-controlled oscillator, so that the voltage-controlled oscillator is allowed to output the oscillation frequency which is multiplied by the reference frequency (more than or equal to an integral multiple of 1).
When the frequency of the input end of the phase discriminator is higher than the frequency of the feedback end, the tunable voltage output by the phase discriminator can be increased, and after the low-pass filtering (integration) action of the low-pass filter, the clean tuning voltage is output to the voltage-controlled oscillator, so that the oscillation frequency output by the voltage-controlled oscillator is increased. Therefore, the frequency of the feedback end of the phase detector can be increased along with the increase of the frequency of the voltage-controlled oscillator, and the input signals of the two phase detectors can be converged or locked to the same frequency finally.
When the frequency of the input end of the phase discriminator is lower than the frequency of the feedback end, the tunable voltage output by the phase discriminator can be reduced, and after the low-pass filtering (integration) action of the low-pass filter, the clean tuning voltage is output to the voltage-controlled oscillator, so that the oscillation frequency output by the voltage-controlled oscillator is reduced. In this way, the frequency of the feedback end of the phase detector can be reduced along with the reduction of the frequency of the voltage-controlled oscillator, and the input signals of the two phase detectors can be converged or locked to the same frequency.
The voltage-current converter converts the voltage oscillation frequency output by the voltage-controlled oscillator into a current signal, outputs the current signal to the current source, and drives the current source to output the oscillation frequency fvcoThe current signal of (2).
The current source receives input and phase noise from the voltage-to-current converterThe input of the detector. Frequency of the voltage-to-current converter is fvcoThe current signal of (a) provides an ac reference for the current source and the input of the phase noise detector provides a dc reference for the current source. The current source outputs an ac current drive signal with a dc bias to the laser.
Further, for convenience of understanding, the following detailed description of the operation process of the driving device of the present invention is provided with reference to fig. 1:
step 1: the clock circuit provides a high stability clock as a reference frequency of the laser drive signal, denoted as fref。
Step 2: and the reference frequency signal passes through a phase discriminator, a low-pass filter, a voltage-controlled oscillator and a frequency divider to form a frequency and phase locking feedback loop, so that a high-precision and high-stability laser driving signal is obtained. The phase detector compares the input reference frequency and phase with the frequency and phase of the feedback. When the comparison result is in a steady state, i.e., the frequency and phase of the feedback match the reference frequency and phase of the input, the frequency and phase may be considered locked. When the frequency and the phase are locked, the phase discriminator has amplification effect on the reference frequency signal, and the gain is Kd. The low-pass filter is used for filtering high-frequency noise of the tunable voltage, plays a role in purifying a high-noise reference frequency signal, and outputs clean tuning voltage to the voltage-controlled oscillator after integration. The voltage-controlled oscillator controls the frequency of the output oscillating signal with a voltage input
Indicating the integration effect. Oscillation frequency f of voltage controlled oscillator outputvcoWill change with the difference of the input voltage, and the voltage-to-frequency conversion ratio of the voltage-controlled oscillator is recorded as Kv. The frequency divider is used for dividing the oscillation frequency output by the voltage-controlled oscillator, thereby allowing the voltage-controlled oscillator to output the oscillation frequency which is multiplied by the reference frequency by a frequency division factor
The transfer function of the feedback loop can be expressed as:
wherein, VdRepresenting the driving signal, V, output by the voltage-controlled oscillatorrefDenotes a clock circuit signal, s ═ j ω denotes a laplacian operator, and ω denotes an angular frequency of the oscillation signal.
And step 3: the voltage-controlled oscillator driving signal is output to the current source through the voltage-current converter. The current source receives an input from a voltage to current converter having a frequency fvcoProvides an ac reference to a current source that outputs a driving signal with an ac current to the laser.
And 4, step 4: the laser outputs frequency f under the action of the drive signal of the voltage-controlled oscillatorvcoWhen the frequency division coefficient of the frequency divider is changed, the optical wave frequency fvcoA change occurs. The frequency division coefficient is changed from small to large step by step, and the broadband frequency sweeping function of the laser output light wave can be realized.
Example two:
an object of the present embodiment is to provide a laser emitting device.
A laser emitting device comprises the laser driving device based on the feedback design and a laser.
Further, a current source in the laser driving device is connected with the laser.
Further, the laser is a tunable laser.
Further, the tunable laser includes a dfb (distributed Feedback laser) laser array and tiltable mems (micro electronic mechanical systems) lenses.
The laser driving device and the laser emitting device based on the feedback design can be realized, and have wide application prospects.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a laser instrument drive arrangement based on feedback design which characterized in that, is including clock circuit, phase discriminator, wave filter, voltage controlled oscillator, V/I converter and the current source of sequential connection, wherein, voltage controlled oscillator includes two way signal output, and signal input is to the frequency divider all the way, and voltage current converter is input to another way signal input, the oscillation frequency after the frequency divider output frequency division feeds back to the phase discriminator.
2. The laser driving apparatus designed based on feedback as set forth in claim 1, wherein the phase detector receives a reference frequency signal generated by a circuit of a clock and an oscillation frequency fed back by the frequency divider and outputs a tunable voltage to the filter.
3. The laser driving apparatus as recited in claim 1, wherein the filter receives the tunable voltage from the phase detector and outputs a denoised tunable voltage to the voltage controlled oscillator.
4. A laser driving apparatus designed based on feedback as claimed in claim 1, wherein the voltage controlled oscillator receives a tunable voltage as a control signal and outputs a corresponding oscillation frequency.
5. A laser driving apparatus designed based on feedback as claimed in claim 1, wherein the filter is a gaussian low pass filter.
6. A laser driving apparatus based on a feedback design as claimed in claim 1, wherein the V/I converter outputs a current signal as an ac reference for the current source, and the current source outputs an ac current driving signal.
7. A laser transmitter comprising a laser driving device based on a feedback design according to any one of claims 1 to 6 and a laser.
8. A laser transmitter as claimed in claim 7, wherein the current source in the laser driving device is connected to the laser.
9. A laser transmitter as claimed in claim 7, wherein the laser is a tunable laser.
10. The laser transmitter of claim 9, wherein said tunable laser comprises a DFB laser array and tiltable MEMs optics.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121570177.7U CN215072365U (en) | 2021-07-09 | 2021-07-09 | Laser driving device based on feedback design and laser emitting device |
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| CN202121570177.7U CN215072365U (en) | 2021-07-09 | 2021-07-09 | Laser driving device based on feedback design and laser emitting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115220512A (en) * | 2022-08-10 | 2022-10-21 | 山东大学 | Automatic phase-locking constant current source circuit and method for driving tunable laser |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115220512A (en) * | 2022-08-10 | 2022-10-21 | 山东大学 | Automatic phase-locking constant current source circuit and method for driving tunable laser |
| CN115220512B (en) * | 2022-08-10 | 2023-10-17 | 山东大学 | Automatic phase-locking constant current source circuit and method for driving tunable laser |
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