CN108196412B - 10MHz-10GHz optical phase-locked loop device - Google Patents
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- 230000003287 optical effect Effects 0.000 title claims abstract description 56
- 239000004065 semiconductor Substances 0.000 claims abstract description 33
- 238000001228 spectrum Methods 0.000 claims abstract description 27
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 23
- 239000010936 titanium Substances 0.000 claims abstract description 23
- 230000035559 beat frequency Effects 0.000 claims description 34
- 238000012544 monitoring process Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 description 6
- 230000003595 spectral effect Effects 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 5
- 230000001427 coherent effect Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 230000005283 ground state Effects 0.000 description 4
- 239000008358 core component Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000003993 interaction Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- IGLNJRXAVVLDKE-NJFSPNSNSA-N Rubidium-87 Chemical compound [87Rb] IGLNJRXAVVLDKE-NJFSPNSNSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000000960 laser cooling Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- IGLNJRXAVVLDKE-IGMARMGPSA-N rubidium-85 atom Chemical compound [85Rb] IGLNJRXAVVLDKE-IGMARMGPSA-N 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/3501—Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals
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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
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- General Physics & Mathematics (AREA)
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Abstract
The invention relates to the field of optical phase-locked loops, in particular to a 10MHz-10GHz optical phase-locked loop device, which comprises a titanium gem laser (1), a semiconductor laser (2), a high-bandwidth photoelectric detector (3), a radio frequency power beam splitter (4), a spectrum analyzer (5), a high-frequency signal generator (6), a mixer (7), a radio frequency power amplifier (8), a signal generator (9), an optical phase-locked loop module (10) and an oscilloscope (11).
Description
Technical Field
The invention relates to the field of nonlinear optics and quantum optics research of light and atomic coherent media, such as the technical fields of electromagnetic induction transparency, multi-wave mixing, quantum imaging, quantum precision measurement and the like, in particular to the field of optical phase-locked loops for preparing optical fields in a non-classical state by utilizing the interaction of light and atomic coherence.
Background
Atomic coherence effects play an important role in the nonlinear process of light interaction with atoms. Coherent media composed of phase coherent light and atoms are widely applied to quantum optical experimental research, such as the fields of electromagnetic induction transparency, quantum communication, multi-wave mixing, laser cooling and atom capture and the like. In the above application, it is necessary to generate two or more beams of light having a frequency difference of several GHz and a constant phase difference. For example, the rubidium 85 atomic ground state is hyperfine-split to 3 GHz, the rubidium 87 atomic ground state is hyperfine-split to 6.8 GHz, and the cesium 133 atomic ground state is hyperfine-split to 9.2 GHz. Therefore, two beams of light which can generate any frequency difference of 10GHz can meet most of the requirements related to the interaction research of the light and atoms.
The current common method for generating two beams of light with frequency difference of several GHz and constant phase difference in experiments mainly includes the following steps: one is to utilize an acousto-optic modulator, two beams of light generated by the method have constant phase difference, but the current commercial acousto-optic modulator can only generate 1.5 GHz frequency shift to the maximum, the frequency tuning range is only about 100 MHz, the diffraction efficiency is only about 10%, and high-power light beams are generated by amplification subsequently; and the second is a method for generating sidebands by using an electro-optical modulator, wherein a radio frequency signal generator is used for driving the electro-optical modulator to generate positive and negative sidebands, and then a filter is used for filtering out a required sideband signal. However, like the acousto-optic modulator, the modulation bandwidth of the electro-optic modulator is only about 100 MHz, and the center frequency of the commercial product is fixed, so that only the frequency shift in a specific frequency range can be realized, and the electro-optic modulator cannot be used for different atomic physical experiments, that is, the universality is poor. Compared with the two methods, the phase locking of the two beams of light is realized by using the optical phase-locked loop, and the method can realize the locking of any frequency difference in a range of several GHz. As early as the sixties of the last century, optical phase-locked loops have been used to lock two lasers to obtain two or more beams of phase coherent light with a large frequency difference. In 2015, the shanxi university zhangjing professor group achieved frequency difference locking of two beams of light with a frequency difference of 6.8 GHz by using a homemade optical phase-locked loop, and the beat line width reached the Hz level. The core component of the self-made optical phase-locked loop is an ADF4107 optical phase-locked loop module of Analog company, the bandwidth is 1 GHz-7 GHz, and the input frequency range of the reference signal is 20 MHz-250 MHz. If the difference between the locked two beams of optical frequency changes, the R frequency divider and the N frequency divider need to be modified at the equipped programmable input port, and the system parameters need to be reset and debugged.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to overcome the defects of the background technology is to provide a device of an optical phase-locked loop for realizing the locking of any frequency difference in the range of 10MHz to 10 GHz.
The technical scheme adopted by the invention is as follows: a10 MHz-10GHz optical phase-locked loop device comprises a titanium sapphire laser (1), a semiconductor laser (2), a high-bandwidth photoelectric detector (3), a radio-frequency power beam splitter (4), a spectrum analyzer (5), a high-frequency signal generator (6), a mixer (7), a radio-frequency power amplifier (8), a signal generator (9), an optical phase-locked loop module (10) and an oscilloscope (11), wherein the high-bandwidth photoelectric detector (3) detects that output light of the titanium sapphire laser (1) and the semiconductor laser (2) generates beat frequency signals and sends the beat frequency signals to the radio-frequency power beam splitter (4), the radio-frequency power beam splitter (4) divides the received beat frequency signals into two paths with equal power and sends the two paths of beat frequency signals to the spectrum analyzer (5) and the mixer (7) respectively, the high-frequency signal generator (6) generates a sine signal and sends the sine signal to the mixer (7), the frequency mixer (7) receives the beat frequency signal, then the beat frequency signal is subjected to frequency reduction and then is sent to the radio frequency power amplifier (8), the radio frequency power amplifier (8) amplifies the beat frequency signal subjected to frequency reduction and then sends the beat frequency signal to the optical phase-locked loop module (10), the signal generator (9) generates a reference signal and sends the reference signal to the optical phase-locked loop module (10), the optical phase-locked loop module (10) mixes the amplified beat frequency signal subjected to frequency reduction and the reference signal to generate an error signal and sends the error signal to the oscilloscope (11), and meanwhile, the error signal generated by the optical phase-locked loop module (10) generates a feedback signal through frequency and phase discrimination and then sends the feedback signal to the semiconductor laser (2) and the oscilloscope (11).
As a preferred mode: the titanium gem laser (1) and the semiconductor laser (2) are both placed on an independent, shock-isolating and heat-insulating optical platform, and a heat-insulating cover is added on the periphery to isolate the laser from the external environment.
As a preferred mode: the spectrum analyzer (5) is used for detecting the frequency difference between the titanium sapphire laser (1) and the semiconductor laser (2).
As a preferred mode: and the locking switch of the phase-locked loop module (10) realizes the locking of the frequency difference and the phase difference of the titanium sapphire laser (1) and the semiconductor laser (2).
The invention has the beneficial effects that: the titanium sapphire laser is stabilized to the frequency required by the experiment through an internal locking loop, beat frequency signals of the semiconductor laser and the titanium sapphire laser are reduced to about 80 MHz through a mixer, an 80 MHz signal generated by a signal generator with low phase noise is used as a reference signal, an optical phase-locked loop module outputs a feedback signal in real time and feeds back the feedback signal to the semiconductor laser by comparing the frequency difference and the phase difference of the beat frequency signal and the reference signal, the frequency and the phase of the beat frequency signal and the phase of the reference signal are always ensured to be consistent, namely the frequency of the semiconductor laser is always changed along with the titanium sapphire laser. The invention uses the mFALC110 produced by Toptica company as the core component of the phase-locked loop, has simple and convenient operation and can realize the locking of any frequency difference in the range of 10MHz to 10 GHz.
Detailed Description
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a graph of the output signal spectrum of the monitor port of the optical PLL module recorded by the oscilloscope channel I;
FIG. 3 is a spectrum of an output signal from an output port of an optical phase-locked loop module recorded by a channel two of the oscilloscope in accordance with the present invention;
FIG. 4 shows the beat signal spectrum lines monitored by the spectrum analyzer when the system is unlocked, wherein the center frequency of the spectrum analyzer is 9.2 GHz, the scanning range is 20 MHz, and the analysis bandwidth is 300 kHz;
FIG. 5 is a plot of the beat signal spectral lines monitored by the spectrum analyzer when the system of the present invention is locked, where the spectrum analyzer has a center frequency of 9.2 GHz, a sweep range of 20 MHz, and an analysis bandwidth of 30 kHz;
FIG. 6 shows the beat signal spectrum lines monitored by the spectrum analyzer when the system is locked, wherein the center frequency of the spectrum analyzer is 9.2 GHz, the scanning range is 20 Hz, and the analysis bandwidth is 1 Hz.
The signal spectral lines after the channel I system is locked, the channel I system unlocked signal spectral lines 2, the channel II system unlocked signal spectral lines 3 and the channel II system locked, and the channel II system locked signal spectral lines 4 are obtained.
Detailed Description
The frequency difference of the two beams output by locking corresponds to the embodiment133Two lasers of Cs atomic ground state hyperfine splitting (9.2 GHz) are exemplified, and as shown in fig. 1, a 10MHz-10GHz optical phase-locked loop device includes a titanium sapphire laser 1, a semiconductor laser 2, a high bandwidth photodetector 3 (KG-PD-20G-a-SM-FA manufactured by beijing corning optical technology limited), a radio frequency power splitter 4 (ZX 10-2-1252+ manufactured by Mini-circuitts), a spectrum analyzer 5, a high frequency signal generator 6 (MG 3692B-20-GHz manufactured by anits), a mixer 7 (ZMX-10G + manufactured by Mini-circuitts), a radio frequency power amplifier 8 (ZHL-1-2W manufactured by Mini-circuitts), a signal generator 9, an optical phase-locked loop module 10 (mfaclc 110 manufactured by Toptica, the input signal bandwidth is 10 MHz-200 MHz, the optimal input power range of a radio frequency port is-35 dBm-1 dBm, the optimal input power range of a local oscillation port is-8 dBm-3 dBm), and an oscilloscope 11 (33250A produced by Agilent).
The titanium gem laser and the semiconductor laser are both placed on an independent, shock-insulation and heat-insulation optical platform, and a heat-insulation cover is added on the periphery of the platform to be isolated from the external environment, so that a light source with stable output frequency and stable power is ensured. The titanium gem laser and the semiconductor laser respectively separate two beams of light with the same polarization of 2.5 mW, and the two beams of light are coupled into a high-bandwidth photoelectric detector 3 with the bandwidth of 20 GHz through the same single-mode optical fiber. The beat frequency signal power generated by the high-bandwidth photoelectric detector 3 is-30 dBm, and the electric signal of-30 dBm is divided into two paths with equal power through the radio frequency power beam splitter 4 and is respectively used for monitoring and locking frequency difference. One path of the beat signal is input into the spectrum analyzer 5 to monitor the power of the beat signal and the spectral line bandwidth of the beat signal, the other path of the beat signal is input into the radio frequency port of the mixer 7, and the high-frequency signal generator 6 generates a sinusoidal signal with the frequency of 9.12 GHz and the power of +7 dBm and inputs the sinusoidal signal into the local oscillation port of the mixer 7. The frequency mixer 7 reduces the beat frequency signal frequency to about 80 MHz, the corresponding power is-38 dBm, the beat frequency signal is amplified from-38 dBm to-4 dBm through the radio frequency power amplifier 8, the beat frequency signal with the power of-4 dBm and the frequency of about 80 MHz is input to the radio frequency port of the optical phase-locked loop module 10, and the high-frequency signal generator 6 outputs a reference signal with the frequency of 80 MHz and the power of-4 dB to the local oscillation port of the optical phase-locked loop module 10. The optical phase-locked loop module 10 mixes the beat signal of the radio frequency port and the reference signal of the local oscillation port through an internal mixer to generate an error signal, and the error signal is subjected to frequency discrimination and phase discrimination to generate a feedback signal. The feedback signal generated by the optical phase-locked loop module 10 is fed back to the dc input port of the semiconductor laser 2 through the output port to realize the locking of the frequency difference and the phase difference of the two lasers. The amplitude of the input voltage of the direct current input port of the semiconductor laser 2 cannot exceed +/-0.8V. The spectrum analyzer 5 arranged above the radio frequency power beam splitter 4 inputs the beat frequency signal into the spectrum analyzer to monitor the beat frequency signal so as to judge the locking condition of the frequency difference of the two lasers. The oscilloscope 11 is disposed on the left side of the optical pll module 10, and the first channel is used to monitor an error signal output by the monitoring port of the optical pll module 10, and the second channel is used to monitor a feedback signal output by the output port of the optical pll module 10, so as to ensure that the amplitude of the feedback signal does not exceed the input voltage amplitude range of the dc input port of the semiconductor laser.
The titanium sapphire laser is stabilized to the frequency required by the experiment through an internal locking loop, beat frequency signals of the semiconductor laser and the titanium sapphire laser are reduced to about 80 MHz through a mixer, an 80 MHz signal generated by a signal generator with low phase noise is used as a reference signal, an optical phase-locked loop module outputs a feedback signal in real time and feeds back the feedback signal to the semiconductor laser by comparing the frequency difference and the phase difference of the beat frequency signal and the reference signal, the frequency and the phase of the beat frequency signal and the phase of the reference signal are always ensured to be consistent, namely the frequency of the semiconductor laser is always changed along with the titanium sapphire laser.
The invention uses the mFALC110 phase-locked loop module produced by Toptica company as the core component of the optical phase-locked loop to lock a semiconductor laser to a titanium gem laser, the frequency difference of two beams of laser can realize the arbitrary precise adjustment from 10MHz to 10GHz, and the beat frequency line width is as low as 1 Hz. The result shows that the two beams of light generated by the device have good coherence, the nonlinear effect of the light and the atomic medium is enhanced, and the device can be applied to the preparation of the non-classical state light field in the field of quantum optics.
As shown in FIG. 2, the frequency of the Titania laser is stable, the frequency of the semiconductor laser starts to change, when the frequency difference between the two lasers is around 9.2 GHz, the oscilloscope channel records a monitoring signal as shown in the 2-curve in FIG. 2, the monitoring signal is the result of mixing the beat signal of the radio frequency port of the optical phase-locked loop module and the reference signal of the local oscillation port through the built-in mixer, and the monitoring signal comprises the low-frequency term of the difference frequency and the high-frequency term of the sum frequency. Curve 3 in fig. 3 is the output feedback voltage signal of the output port of the optical pll module recorded in the oscilloscope channel two at this time.
When the frequency difference of the two lasers deviates 9.2 GHz, the optical phase-locked loop module feeds back a feedback voltage signal of the output port to the direct current input port of the semiconductor laser to rapidly modulate the current of the semiconductor laser, so that the frequency difference between the laser and the titanium sapphire laser is always 9.2 GHz.
The curve 1 in fig. 2 and the curve 4 in fig. 3 show the output voltage signals of the monitoring port and the output port of the optical phase-locked loop module after the frequency difference and the phase difference of the two lasers are locked, and the voltage values thereof are stabilized around 0. The output voltage amplitude of the output port is about 0.1V and does not exceed the requirement of +/-0.8V of the input voltage amplitude of the direct current input port of the semiconductor laser.
FIG. 4 is a power spectrum of beat signals output by two lasers when the optical PLL module is not locked, wherein the center frequency of the spectrum analyzer is 9.2 GHz, the scanning range is 20 MHz, and the analysis bandwidth is 300 kHz. Because the semiconductor laser runs freely, the relative phase and the relative frequency of the two beams of light change randomly without fixed phase difference and frequency difference, the center frequency of the beat frequency signal is 9.2 GHz, and the line width is about 5 MHz.
Fig. 5 shows power spectra of beat signals output by two lasers after frequency difference and phase difference locking are achieved, and compared with fig. 4, the line width of the beat signals is significantly narrowed.
FIG. 6 shows the beat signal spectrum line monitored by the spectrum analyzer when the system is locked, wherein the center frequency of the spectrum analyzer is 9.2 GHz, the scanning range is 20 Hz, and the analysis bandwidth is 1 Hz. It can be clearly seen in the figure that the bandwidth of the beat frequency signal is narrowed from 5 MHz to 1 Hz, and the narrower line width indicates that the frequency and phase changes of the two lasers are more synchronous, i.e. the semiconductor laser always changes along with the titanium sapphire laser, thereby realizing the frequency difference and phase difference locking of the two lasers.
Claims (4)
1. A10 MHz-10GHz optics phase-locked loop device which characterized in that: the device comprises a titanium sapphire laser (1), a semiconductor laser (2), a high-bandwidth photoelectric detector (3), a radio frequency power beam splitter (4), a spectrum analyzer (5), a high-frequency signal generator (6), a frequency mixer (7), a radio frequency power amplifier (8), a signal generator (9), an optical phase-locked loop module (10) and an oscilloscope (11), wherein the high-bandwidth photoelectric detector (3) detects that the output light of the titanium sapphire laser (1) and the output light of the semiconductor laser (2) generate beat frequency signals and send the beat frequency signals to the radio frequency power beam splitter (4), the radio frequency power beam splitter (4) divides the received beat frequency signals into two paths with equal power and sends the two paths of beat frequency signals to the spectrum analyzer (5) and the frequency mixer (7) respectively, and the high-frequency signal generator (6) generates a sine signal and sends the sine signal to the frequency mixer (7), the frequency mixer (7) receives the beat frequency signal, then frequency-reduces the beat frequency signal and sends the beat frequency signal to the radio frequency power amplifier (8), the radio frequency power amplifier (8) amplifies the frequency-reduced beat frequency signal and sends the amplified frequency-reduced beat frequency signal to the optical phase-locked loop module (10), the signal generator (9) generates a reference signal and sends the reference signal to the optical phase-locked loop module (10), the optical phase-locked loop module (10) mixes the amplified frequency-reduced beat frequency signal and the reference signal to generate an error signal and sends the error signal to the oscilloscope (11), and meanwhile, the error signal generated by the optical phase-locked loop module (10) generates a feedback signal through frequency and phase discrimination and sends the feedback signal to the semiconductor laser (2) and the oscilloscope (11); the oscilloscope (11) is arranged on the left side of the optical phase-locked loop module (10), a first channel of the oscilloscope is used for monitoring an error signal output by a monitoring port of the optical phase-locked loop module (10), and a second channel of the oscilloscope is used for monitoring a feedback signal output by an output port of the optical phase-locked loop module (10) to ensure that the amplitude of the feedback signal does not exceed the amplitude range of an input voltage of a direct current input port of the semiconductor laser (2).
2. The 10MHz-10GHz optical phase locked loop device of claim 1, wherein: the titanium gem laser (1) and the semiconductor laser (2) are both placed on an independent, shock-isolating and heat-insulating optical platform, and a heat-insulating cover is added on the periphery to isolate the laser from the external environment.
3. The 10MHz-10GHz optical phase locked loop device of claim 1, wherein: the spectrum analyzer (5) is used for detecting the frequency difference between the titanium sapphire laser (1) and the semiconductor laser (2).
4. The 10MHz-10GHz optical phase locked loop device of claim 1, wherein: and the locking switch of the optical phase-locked loop module (10) realizes the locking of the frequency difference and the phase difference of the titanium sapphire laser (1) and the semiconductor laser (2).
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Citations (3)
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|---|---|---|---|---|
| CN101567689A (en) * | 2009-04-03 | 2009-10-28 | 西安电子科技大学 | Phase-locked loop based on equivalent phase demodulation frequency |
| CN101800395A (en) * | 2010-03-04 | 2010-08-11 | 浙江大学 | Digitalized laser phase-locking device and phase-locking method |
| CN107171166A (en) * | 2017-07-03 | 2017-09-15 | 中国科学院上海微***与信息技术研究所 | Terahertz quantum cascaded laser phase-locked system and method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567689A (en) * | 2009-04-03 | 2009-10-28 | 西安电子科技大学 | Phase-locked loop based on equivalent phase demodulation frequency |
| CN101800395A (en) * | 2010-03-04 | 2010-08-11 | 浙江大学 | Digitalized laser phase-locking device and phase-locking method |
| CN107171166A (en) * | 2017-07-03 | 2017-09-15 | 中国科学院上海微***与信息技术研究所 | Terahertz quantum cascaded laser phase-locked system and method |
Non-Patent Citations (2)
| Title |
|---|
| A versatile digital GHz phase lock for external cavity diode lasers;J¨urgen Appel1 etc.;《MEASUREMENT SCIENCE AND TECHNOLOGY》;20090417;全文 * |
| 光学相位锁定激光在原子玻色-爱因斯坦凝聚中实现拉曼耦合;孟增明等;《物理学报》;20151231;第64卷(第24期);正文第2部分，图1 * |
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