CN112636710A - Phase-locked amplifier suitable for laser frequency locking - Google Patents
Phase-locked amplifier suitable for laser frequency locking Download PDFInfo
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- CN112636710A CN112636710A CN202110132151.2A CN202110132151A CN112636710A CN 112636710 A CN112636710 A CN 112636710A CN 202110132151 A CN202110132151 A CN 202110132151A CN 112636710 A CN112636710 A CN 112636710A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F7/00—Parametric amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
Abstract
The invention relates to a laser frequency locking technology, in particular to a phase-locked amplifier suitable for laser frequency locking. The problems that the working frequency range or the optimal working frequency interval of the conventional commercial phase-locked amplifier does not necessarily contain the modulation frequency of an error signal, the continuous adjustment of phase shift and gain cannot be realized, the independent adjustment of a monitored error signal cannot be realized, and the manufacturing cost is high are solved. A phase-locked amplifier suitable for laser frequency locking comprises a first BNC connector, a first resistor, a first LC filter circuit, a second LC filter circuit, a first in-phase amplification circuit, a first RC filter circuit, a mixer, a second BNC connector, an isolation circuit, a phase-shifting circuit, a first anti-phase amplification circuit, a seventeenth resistor, a third BNC connector, a second anti-phase amplification circuit, a second RC filter circuit, a third RC filter circuit, a second in-phase amplification circuit, a twenty-sixth resistor, a fourth BNC connector, a bias amplification circuit, a thirty-first resistor and a fifth BNC connector. The invention is suitable for laser frequency locking.
Description
Technical Field
The invention relates to a laser frequency locking technology, in particular to a phase-locked amplifier suitable for laser frequency locking.
Background
With the continuous development and innovation of laser technology, lasers have been widely used in industry, medical treatment, military, precision measurement, communication, and the like. In practical application, in order to overcome the influence of factors such as ambient temperature and external mechanical vibration on the laser frequency, the laser frequency is often locked to the resonance transition frequency of atoms, molecules or an F-P cavity. However, before the laser frequency is locked, it is necessary to output an error signal for locking the laser frequency by modulating and demodulating an absorption signal containing an atomic, molecular, or F-P cavity resonance transition frequency using a lock-in amplifier. Under the prior art, the commercial lock-in amplifier has the following problems due to the limitation of the structure thereof: first, the operating frequency range or the optimum operating frequency range of the conventional commercial lock-in amplifier does not necessarily include the modulation frequency of the error signal, and thus it often does not meet the use requirement. Secondly, the existing commercial lock-in amplifier (for example, SRS lock-in amplifier in the united states) realizes discrete adjustment of phase shift and gain by pressing keys, but cannot realize continuous adjustment of phase shift and gain, so that the output error signal cannot be well matched with the laser. Third, existing commercial lock-in amplifiers do not enable independent adjustment of the monitored error signal, and thus optimization of the monitored error signal. Fourthly, the cost of the existing commercial lock-in amplifier is relatively high. Therefore, it is necessary to provide a lock-in amplifier suitable for laser frequency locking to solve the problems that the working frequency range or the optimal working frequency interval of the conventional commercial lock-in amplifier does not necessarily include the modulation frequency of the error signal, the phase shift and the continuous adjustment of the gain cannot be realized, the independent adjustment of the monitored error signal cannot be realized, and the manufacturing cost is high.
Disclosure of Invention
The invention provides a phase-locked amplifier suitable for laser frequency locking, aiming at solving the problems that the working frequency range or the optimal working frequency interval of the existing commercial phase-locked amplifier does not necessarily contain the modulation frequency of an error signal, the continuous adjustment of phase shift and gain can not be realized, the independent adjustment of a monitored error signal can not be realized, and the manufacturing cost is high.
The invention is realized by adopting the following technical scheme:
a phase-locked amplifier suitable for laser frequency locking comprises a first BNC joint, a first resistor, a first LC filter circuit, a second LC filter circuit, a first in-phase amplification circuit, a first RC filter circuit, a mixer, a second BNC joint, an isolation circuit, a phase-shifting circuit, a first anti-phase amplification circuit, a seventeenth resistor, a third BNC joint, a second anti-phase amplification circuit, a second RC filter circuit, a third RC filter circuit, a second in-phase amplification circuit, a twenty-sixth resistor, a fourth BNC joint, a bias amplification circuit, a thirty-first resistor and a fifth BNC joint;
the first LC filter circuit comprises a first inductor and a first capacitor; the second LC filter circuit comprises a second capacitor and a second inductor; the first in-phase amplifying circuit comprises a second resistor, a third resistor, a fourth resistor and a first operational amplifier; the first RC filter circuit comprises a fifth resistor and a third capacitor;
the isolation circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a second operational amplifier; the phase shift circuit comprises a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourth capacitor and a third operational amplifier; the first inverting amplifying circuit comprises a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fifth capacitor and a fourth operational amplifier;
the second inverting amplifying circuit comprises an eighteenth resistor, a nineteenth resistor, a twentieth resistor and a fifth operational amplifier; the second RC filter circuit comprises a sixth capacitor and a twenty-first resistor;
the third RC filter circuit comprises a twenty-second resistor and a seventh capacitor; the second in-phase amplifying circuit comprises a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor and a sixth operational amplifier; the bias amplifying circuit comprises a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirty-eighth resistor, an eighth capacitor and a seventh operational amplifier;
the fourth resistor, the twelfth resistor, the fourteenth resistor, the twenty-seventh resistor and the twenty-ninth resistor are adjustable resistors;
the first BNC connector is connected with the positive input end of the first operational amplifier through a first resistor, a first inductor, a second capacitor and a second resistor in sequence; one end of the first capacitor is grounded, and the other end of the first capacitor is connected with the positive input end of the first operational amplifier through the second capacitor and the second resistor in sequence; one end of the second inductor is grounded, and the other end of the second inductor is connected with the positive input end of the first operational amplifier through a second resistor; one end of the third resistor is grounded, and the other end of the third resistor is connected with the negative input end of the first operational amplifier; the output end of the first operational amplifier is connected with the radio frequency end of the frequency mixer sequentially through a fifth resistor and a third capacitor on one hand, and is connected with the sliding end of a fourth resistor on the other hand; one fixed end of the fourth resistor is connected with the positive input end of the first operational amplifier;
the second BNC connector is connected with the negative input end of the second operational amplifier through a sixth resistor; one end of the seventh resistor is grounded, and the other end of the seventh resistor is connected with the negative input end of the second operational amplifier; one end of the eighth resistor is grounded, and the other end of the eighth resistor is connected with the positive input end of the second operational amplifier; one end of the ninth resistor is grounded, and the other end of the ninth resistor is connected with the positive input end of the second operational amplifier; the output end of the second operational amplifier is connected with the negative input end of the third operational amplifier through a tenth resistor on one hand, and is connected with one fixed end of a twelfth resistor through an eleventh resistor on the other hand; the sliding end of the twelfth resistor is connected with the positive input end of the third operational amplifier; one end of the fourth capacitor is grounded, and the other end of the fourth capacitor is connected with the positive input end of the third operational amplifier; the output end of the third operational amplifier is connected with one fixed end of the fourteenth resistor on one hand and is connected with the negative input end of the third operational amplifier through the thirteenth resistor on the other hand; the sliding end of the fourteenth resistor is connected with the negative input end of the fourth operational amplifier; one end of the fifteenth resistor is grounded, and the other end of the fifteenth resistor is connected with the positive input end of the fourth operational amplifier; the output end of the fourth operational amplifier is connected with the third BNC connector through a seventeenth resistor on one hand, and is connected with the negative input end of the fourth operational amplifier through a sixteenth resistor on the other hand, and the third output end of the fourth operational amplifier is connected with the negative input end of the fourth operational amplifier through a fifth capacitor on the other hand;
one end of the eighteenth resistor is connected with the output end of the second operational amplifier, and the other end of the eighteenth resistor is connected with the positive input end of the fifth operational amplifier; one end of the nineteenth resistor is grounded, and the other end of the nineteenth resistor is connected with the negative input end of the fifth operational amplifier; the output end of the fifth operational amplifier is connected with the local oscillation end of the frequency mixer sequentially through a sixth capacitor and a twenty-first resistor on one hand, and is connected with the negative input end of the fifth operational amplifier through a twentieth resistor on the other hand;
the intermediate frequency end of the mixer is connected with the positive input end of the sixth operational amplifier through a twenty-second resistor and a twenty-third resistor in sequence; one end of the seventh capacitor is grounded, and the other end of the seventh capacitor is connected with the positive input end of the sixth operational amplifier through a thirteenth resistor; one end of the twenty-fourth resistor is grounded, and the other end of the twenty-fourth resistor is connected with the negative input end of the sixth operational amplifier; the output end of the sixth operational amplifier is connected with the fourth BNC connector through a twenty-sixth resistor on one hand, connected with the negative input end of the sixth operational amplifier through a twenty-fifth resistor on the other hand, and connected with one fixed end of a twenty-seventh resistor on the third hand;
the sliding end of the twenty-seventh resistor is connected with the negative input end of the seventh operational amplifier; two fixed ends of the twenty-ninth resistor are respectively connected with a +15V power supply end and a-15V power supply end; the sliding end of the twenty-ninth resistor is connected with the positive input end of the seventh operational amplifier through a thirty-th resistor; the output end of the seventh operational amplifier is connected with the fifth BNC connector through a thirty-first resistor on one hand, connected with the negative input end of the seventh operational amplifier through a twenty-eighth resistor on the other hand, and connected with the negative input end of the seventh operational amplifier through an eighth capacitor on the third hand.
The first operational amplifier, the third operational amplifier, the fourth operational amplifier, the fifth operational amplifier, the sixth operational amplifier and the seventh operational amplifier are AD711 operational amplifiers; the second operational amplifier is an INA114 type operational amplifier; the mixer is an SRA-6 type mixer.
During operation, the second BNC connector is connected with the output end of the low-frequency signal generator. And the third BNC connector is connected with the current driving end of the laser. And the fourth BNC joint is connected with the current feedback end and the piezoelectric ceramic feedback end of the laser through the PID controller. And the fifth BNC connector is connected with the input end of the oscilloscope.
The specific working process is as follows: firstly, a small part of laser output by the laser reacts with an atomic gas cell to generate a saturated absorption spectrum signal containing atomic resonance transition frequency. The saturated absorption spectrum signal is input through the first BNC connector and the first resistor in sequence, and then is transmitted to the radio frequency end of the mixer after being subjected to low-pass filtering, high-pass filtering, amplifying and filtering through the first LC filter circuit, the second LC filter circuit, the first in-phase amplifying circuit and the first RC filter circuit in sequence. In the process, the gain of the first in-phase amplifying circuit can be continuously adjusted by adjusting the resistance value of the fourth resistor. Then, the low-frequency signal generator outputs a sinusoidal radio frequency signal with the frequency range of 3-50 kHz. The sinusoidal radio frequency signal is firstly input through the second BNC connector, and then is divided into two paths after being isolated through the isolation circuit: the first path is used as a modulation signal, and the second path is used as a demodulation signal. The modulation signal is subjected to phase shifting and amplification through the phase shifting circuit and the first inverting amplification circuit in sequence, and then is transmitted to the current driving end of the laser through the seventeenth resistor and the third BNC connector in sequence, so that amplitude modulation is performed on the saturated absorption spectrum signal. The demodulated signal is sequentially amplified and filtered by the second inverting amplifying circuit and the second RC filtering circuit and then transmitted to the local oscillator end of the frequency mixer, so that the saturated absorption spectrum signal is demodulated. In this process, the gain of the first inverting amplifier circuit can be continuously adjusted by adjusting the resistance of the fourteenth resistor. Then, the phase shift of the modulation signal is continuously adjusted by adjusting the resistance value of the twelfth resistor. When the phase of the modulation signal meets the phase matching condition, the intermediate frequency end of the mixer outputs an error signal. The error signal is filtered (high-frequency signal part is filtered) and amplified by the third RC filter circuit and the second in-phase amplifying circuit in sequence, and then is transmitted to the current feedback end and the piezoelectric ceramic feedback end of the laser by the twenty-sixth resistor, the fourth BNC connector and the PID controller in sequence, so that the laser frequency is locked. Meanwhile, the error signal is amplified by the bias amplifying circuit and then sequentially transmitted to the input end of the oscilloscope through the thirty-first resistor and the fifth BNC connector, so that the error signal is monitored. In the process, the amplitude of the monitored error signal can be independently adjusted by adjusting the resistance value of the twenty-seventh resistor. By adjusting the resistance of the twenty-ninth resistor, the zero position of the monitored error signal can be independently adjusted. By selecting an eighth capacitor of suitable resistance, the monitored error signal can be optimized for active filtering.
Based on the above process, compared with the existing commercial lock-in amplifier, the lock-in amplifier suitable for laser frequency locking of the invention adopts a brand new structure, and has the following advantages: firstly, the optimal frequency range of the modulation signal is considered, and the band-pass filter circuit consisting of the first LC filter circuit and the second LC filter circuit is arranged, so that the working frequency range or the optimal working frequency interval of the phase-locked amplifier is reasonably specified on one hand, and on the other hand, the high-frequency signal part in the saturated absorption spectrum signal is filtered out, so that the working frequency range or the optimal working frequency interval of the phase-locked amplifier contains the modulation frequency of the error signal on the one hand, and the signal-to-noise ratio of the output error signal is improved on the other hand. Secondly, the phase shift and the gain are continuously adjusted by arranging the fourth resistor, the twelfth resistor and the fourteenth resistor, so that the output signal can be well matched with the laser. Thirdly, the invention realizes the independent adjustment of the monitored error signal by arranging the twenty-seventh resistor, the twenty-ninth resistor and the eighth capacitor, thereby realizing the optimization of the monitored error signal. Fourthly, the manufacturing cost of the invention is lower.
The invention has reasonable structure and ingenious design, effectively solves the problems that the working frequency range or the optimal working frequency interval of the existing commercial phase-locked amplifier does not necessarily contain the modulation frequency of the error signal, the continuous adjustment of phase shift and gain can not be realized, the independent adjustment of the monitored error signal can not be realized, and the manufacturing cost is high, and is suitable for laser frequency locking.
Drawings
Fig. 1 is a circuit schematic of the present invention.
Fig. 2 is a schematic diagram of a saturated absorption spectrum signal and an error signal in the present invention.
In fig. 2: the solid line represents the saturated absorption spectrum signal and the dashed line represents the error signal.
Detailed Description
A phase-locked amplifier suitable for laser frequency locking comprises a first BNC joint J1, a first resistor R1, a first LC filter circuit, a second LC filter circuit, a first in-phase amplification circuit, a first RC filter circuit, a mixer H, a second BNC joint J2, an isolation circuit, a phase-shifting circuit, a first anti-phase amplification circuit, a seventeenth resistor R17, a third BNC joint J3, a second anti-phase amplification circuit, a second RC filter circuit, a third RC filter circuit, a second in-phase amplification circuit, a twenty-sixth resistor R26, a fourth BNC joint J4, a bias amplification circuit, a thirty-first resistor R31 and a fifth BNC joint J5;
the first LC filter circuit comprises a first inductor L1 and a first capacitor C1; the second LC filter circuit comprises a second capacitor C2 and a second inductor L2; the first non-inverting amplifying circuit comprises a second resistor R2, a third resistor R3, a fourth resistor R4 and a first operational amplifier U1; the first RC filter circuit comprises a fifth resistor R5 and a third capacitor C3;
the isolation circuit comprises a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a second operational amplifier U2; the phase shift circuit comprises a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourth capacitor C4 and a third operational amplifier U3; the first inverting amplifying circuit comprises a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a fifth capacitor C5 and a fourth operational amplifier U4;
the second inverting amplifying circuit comprises an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20 and a fifth operational amplifier U5; the second RC filter circuit comprises a sixth capacitor C6 and a twenty-first resistor R21;
the third RC filter circuit comprises a twenty-second resistor R22 and a seventh capacitor C7; the second in-phase amplifying circuit comprises a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25 and a sixth operational amplifier U6; the bias amplifying circuit comprises a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirty-third resistor R30, an eighth capacitor C8 and a seventh operational amplifier U7;
the fourth resistor R4, the twelfth resistor R12, the fourteenth resistor R14, the twenty-seventh resistor R27 and the twenty-ninth resistor R29 are all adjustable resistors;
the first BNC connector J1 is connected to the positive input end of the first operational amplifier U1 through a first resistor R1, a first inductor L1, a second capacitor C2, and a second resistor R2 in sequence; one end of the first capacitor C1 is grounded, and the other end of the first capacitor C1 is connected with the positive input end of the first operational amplifier U1 through a second capacitor C2 and a second resistor R2 in sequence; one end of the second inductor L2 is grounded, and the other end is connected to the positive input end of the first operational amplifier U1 through a second resistor R2; one end of the third resistor R3 is grounded, and the other end of the third resistor R3 is connected with the negative input end of the first operational amplifier U1; the output end of the first operational amplifier U1 is connected with the radio frequency end of the mixer H sequentially through a fifth resistor R5 and a third capacitor C3 on one hand, and is connected with the sliding end of a fourth resistor R4 on the other hand; one fixed end of the fourth resistor R4 is connected with the positive input end of the first operational amplifier U1;
the second BNC joint J2 is connected with the negative input end of the second operational amplifier U2 through a sixth resistor R6; one end of the seventh resistor R7 is grounded, and the other end of the seventh resistor R7 is connected with the negative input end of the second operational amplifier U2; one end of the eighth resistor R8 is grounded, and the other end of the eighth resistor R8 is connected with the positive input end of the second operational amplifier U2; one end of the ninth resistor R9 is grounded, and the other end of the ninth resistor R9 is connected with the positive input end of the second operational amplifier U2; the output end of the second operational amplifier U2 is connected with the negative input end of the third operational amplifier U3 through a tenth resistor R10 on one hand, and is connected with one fixed end of a twelfth resistor R12 through an eleventh resistor R11 on the other hand; the sliding end of the twelfth resistor R12 is connected with the positive input end of the third operational amplifier U3; one end of the fourth capacitor C4 is grounded, and the other end is connected with the positive input end of the third operational amplifier U3; the output end of the third operational amplifier U3 is connected with one fixed end of a fourteenth resistor R14 on one hand, and is connected with the negative input end of a third operational amplifier U3 through a thirteenth resistor R13 on the other hand; the sliding end of the fourteenth resistor R14 is connected with the negative input end of the fourth operational amplifier U4; one end of the fifteenth resistor R15 is grounded, and the other end of the fifteenth resistor R15 is connected with the positive input end of the fourth operational amplifier U4; the output end of the fourth operational amplifier U4 is connected with the third BNC joint J3 through a seventeenth resistor R17 on one hand, is connected with the negative input end of the fourth operational amplifier U4 through a sixteenth resistor R16 on the other hand, and is connected with the negative input end of the fourth operational amplifier U4 through a fifth capacitor C5 on the third hand;
one end of an eighteenth resistor R18 is connected with the output end of the second operational amplifier U2, and the other end of the eighteenth resistor R18 is connected with the positive input end of the fifth operational amplifier U5; one end of the nineteenth resistor R19 is grounded, and the other end of the nineteenth resistor R19 is connected with the negative input end of the fifth operational amplifier U5; the output end of the fifth operational amplifier U5 is connected with the local oscillation end of the mixer H sequentially through a sixth capacitor C6 and a twenty-first resistor R21 on one hand, and is connected with the negative input end of the fifth operational amplifier U5 through a twentieth resistor R20 on the other hand;
the intermediate frequency end of the mixer H is connected with the positive input end of a sixth operational amplifier U6 through a twelfth resistor R22 and a twenty-third resistor R23 in sequence; one end of the seventh capacitor C7 is grounded, and the other end is connected with the positive input end of the sixth operational amplifier U6 through a thirteenth resistor R23; one end of the twenty-fourth resistor R24 is grounded, and the other end of the twenty-fourth resistor R24 is connected with the negative input end of the sixth operational amplifier U6; the output end of the sixth operational amplifier U6 is connected with the fourth BNC connector J4 through a twenty-sixth resistor R26 on the one hand, is connected with the negative input end of the sixth operational amplifier U6 through a twenty-fifth resistor R25 on the other hand, and is connected with one fixed end of a twenty-seventh resistor R27 on the third hand;
the sliding end of the twenty-seventh resistor R27 is connected with the negative input end of the seventh operational amplifier U7; two fixed ends of a twenty-ninth resistor R29 are respectively connected with a +15V power supply end and a-15V power supply end; the sliding end of the twenty-ninth resistor R29 is connected with the positive input end of the seventh operational amplifier U7 through a thirty-first resistor R30; the output end of the seventh operational amplifier U7 is connected to the fifth BNC junction J5 through a thirty-first resistor R31, to the negative input end of the seventh operational amplifier U7 through a twenty-eighth resistor R28, and to the negative input end of the seventh operational amplifier U7 through an eighth capacitor C8.
The first operational amplifier U1, the third operational amplifier U3, the fourth operational amplifier U4, the fifth operational amplifier U5, the sixth operational amplifier U6 and the seventh operational amplifier U7 are AD711 operational amplifiers; the second operational amplifier U2 is an INA114 type operational amplifier; the mixer H is an SRA-6 type mixer.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (2)
1. A lock-in amplifier adapted for laser frequency locking, comprising: the high-frequency band-pass filter comprises a first BNC connector (J1), a first resistor (R1), a first LC filter circuit, a second LC filter circuit, a first in-phase amplification circuit, a first RC filter circuit, a mixer (H), a second BNC connector (J2), an isolation circuit, a phase-shifting circuit, a first anti-phase amplification circuit, a seventeenth resistor (R17), a third BNC connector (J3), a second anti-phase amplification circuit, a second RC filter circuit, a third RC filter circuit, a second in-phase amplification circuit, a twenty-sixth resistor (R26), a fourth BNC connector (J4), a bias amplification circuit, a thirty-first resistor (R31) and a fifth BNC connector (J5);
the first LC filter circuit comprises a first inductor (L1), a first capacitor (C1); the second LC filter circuit comprises a second capacitor (C2), a second inductor (L2); the first non-inverting amplifying circuit comprises a second resistor (R2), a third resistor (R3), a fourth resistor (R4) and a first operational amplifier (U1); the first RC filter circuit comprises a fifth resistor (R5) and a third capacitor (C3);
the isolation circuit comprises a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9) and a second operational amplifier (U2); the phase shift circuit comprises a tenth resistor (R10), an eleventh resistor (R11), a twelfth resistor (R12), a thirteenth resistor (R13), a fourth capacitor (C4) and a third operational amplifier (U3); the first inverting amplifying circuit comprises a fourteenth resistor (R14), a fifteenth resistor (R15), a sixteenth resistor (R16), a fifth capacitor (C5) and a fourth operational amplifier (U4);
the second inverting amplifying circuit comprises an eighteenth resistor (R18), a nineteenth resistor (R19), a twentieth resistor (R20) and a fifth operational amplifier (U5); the second RC filter circuit comprises a sixth capacitor (C6) and a twenty-first resistor (R21);
the third RC filter circuit comprises a twenty-second resistor (R22) and a seventh capacitor (C7); the second in-phase amplifying circuit comprises a twenty-third resistor (R23), a twenty-fourth resistor (R24), a twenty-fifth resistor (R25) and a sixth operational amplifier (U6); the bias amplifying circuit comprises a twenty-seventh resistor (R27), a twenty-eighth resistor (R28), a twenty-ninth resistor (R29), a thirty-eighth resistor (R30), an eighth capacitor (C8) and a seventh operational amplifier (U7);
the fourth resistor (R4), the twelfth resistor (R12), the fourteenth resistor (R14), the twenty-seventh resistor (R27) and the twenty-ninth resistor (R29) are all adjustable resistors;
the first BNC connector (J1) is connected with the positive input end of the first operational amplifier (U1) through a first resistor (R1), a first inductor (L1), a second capacitor (C2) and a second resistor (R2) in sequence; one end of the first capacitor (C1) is grounded, and the other end of the first capacitor (C1) is connected with the positive input end of the first operational amplifier (U1) through the second capacitor (C2) and the second resistor (R2) in sequence; one end of the second inductor (L2) is grounded, and the other end of the second inductor is connected with the positive input end of the first operational amplifier (U1) through a second resistor (R2); one end of the third resistor (R3) is grounded, and the other end of the third resistor (R3) is connected with the negative input end of the first operational amplifier (U1); the output end of the first operational amplifier (U1) is connected with the radio frequency end of the mixer (H) sequentially through a fifth resistor (R5) and a third capacitor (C3) on one hand, and is connected with the sliding end of a fourth resistor (R4) on the other hand; one fixed end of the fourth resistor (R4) is connected with the positive input end of the first operational amplifier (U1);
the second BNC connector (J2) is connected with the negative input end of the second operational amplifier (U2) through a sixth resistor (R6); one end of the seventh resistor (R7) is grounded, and the other end of the seventh resistor (R7) is connected with the negative input end of the second operational amplifier (U2); one end of the eighth resistor (R8) is grounded, and the other end of the eighth resistor (R8) is connected with the positive input end of the second operational amplifier (U2); one end of the ninth resistor (R9) is grounded, and the other end of the ninth resistor (R9) is connected with the positive input end of the second operational amplifier (U2); the output end of the second operational amplifier (U2) is connected with the negative input end of the third operational amplifier (U3) through a tenth resistor (R10) on one hand, and is connected with one fixed end of a twelfth resistor (R12) through an eleventh resistor (R11) on the other hand; the sliding end of the twelfth resistor (R12) is connected with the positive input end of the third operational amplifier (U3); one end of the fourth capacitor (C4) is grounded, and the other end of the fourth capacitor is connected with the positive input end of the third operational amplifier (U3); the output end of the third operational amplifier (U3) is connected with one fixed end of a fourteenth resistor (R14) on one hand, and is connected with the negative input end of the third operational amplifier (U3) through a thirteenth resistor (R13) on the other hand; the sliding end of the fourteenth resistor (R14) is connected with the negative input end of the fourth operational amplifier (U4); one end of a fifteenth resistor (R15) is grounded, and the other end of the fifteenth resistor is connected with the positive input end of a fourth operational amplifier (U4); the output end of the fourth operational amplifier (U4) is connected with the third BNC connector (J3) through a seventeenth resistor (R17), connected with the negative input end of the fourth operational amplifier (U4) through a sixteenth resistor (R16), and connected with the negative input end of the fourth operational amplifier (U4) through a fifth capacitor (C5);
one end of an eighteenth resistor (R18) is connected with the output end of the second operational amplifier (U2), and the other end of the eighteenth resistor (R18) is connected with the positive input end of the fifth operational amplifier (U5); one end of the nineteenth resistor (R19) is grounded, and the other end of the nineteenth resistor (R19) is connected with the negative input end of the fifth operational amplifier (U5); the output end of the fifth operational amplifier (U5) is connected with the local oscillator end of the mixer (H) sequentially through a sixth capacitor (C6) and a twenty-first resistor (R21) on one hand, and is connected with the negative input end of the fifth operational amplifier (U5) through a twentieth resistor (R20) on the other hand;
the intermediate frequency end of the mixer (H) is connected with the positive input end of a sixth operational amplifier (U6) through a twenty-second resistor (R22) and a twenty-third resistor (R23) in sequence; one end of the seventh capacitor (C7) is grounded, and the other end of the seventh capacitor (C7) is connected with the positive input end of the sixth operational amplifier (U6) through a twenty-third resistor (R23); one end of the twenty-fourth resistor (R24) is grounded, and the other end of the twenty-fourth resistor (R24) is connected with the negative input end of the sixth operational amplifier (U6); the output end of the sixth operational amplifier (U6) is connected with the fourth BNC connector (J4) through a twenty-sixth resistor (R26), connected with the negative input end of the sixth operational amplifier (U6) through a twenty-fifth resistor (R25), and connected with one fixed end of a twenty-seventh resistor (R27);
the sliding end of the twenty-seventh resistor (R27) is connected with the negative input end of the seventh operational amplifier (U7); two fixed ends of a twenty-ninth resistor (R29) are respectively connected with a +15V power supply end and a-15V power supply end; the sliding end of the twenty-ninth resistor (R29) is connected with the positive input end of the seventh operational amplifier (U7) through a thirty-third resistor (R30); the output end of the seventh operational amplifier (U7) is connected with the fifth BNC connector (J5) through a thirty-first resistor (R31), connected with the negative input end of the seventh operational amplifier (U7) through a twenty-eighth resistor (R28), and connected with the negative input end of the seventh operational amplifier (U7) through an eighth capacitor (C8).
2. A lock-in amplifier adapted for laser frequency locking according to claim 1, wherein: the first operational amplifier (U1), the third operational amplifier (U3), the fourth operational amplifier (U4), the fifth operational amplifier (U5), the sixth operational amplifier (U6) and the seventh operational amplifier (U7) are AD711 operational amplifiers; the second operational amplifier (U2) is an INA114 type operational amplifier; the mixer (H) is an SRA-6 type mixer.
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