CN102213619A - Laser frequency measuring device and method - Google Patents
Laser frequency measuring device and method Download PDFInfo
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Abstract
The invention relates to a laser frequency measuring device and method, which belongs to the field of a femtosecond laser frequency measuring technique. The measuring device provided by the invention comprises a femtosecond laser frequency comb device, a laser pulse compressor, a light spectrum widening device, a first total reflection mirror, a transmission quartz grating and a total reflection mirror group matched with the transmission quartz grating, a first beat frequency light path, a second beat frequency light path, a first data acquisition device and a second data acquisition device, wherein the transmission quartz grating and the total reflection mirror group matched with the transmission quartz grating can be substituted by a first narrow-band high reflection mirror and a second narrow-band high reflection mirror. The measuring device provided by the invention has the advantages of compact structure, convenience in operation, low cost and flexible application, can be used for the laser frequency measurement in a visible light range and the precision measurement in the infrared and ultraviolet laser frequency ranges; each wavelength component in the broadband of a femtosecond light comb is effectively utilized; and compared with the conventional frequency measuring system equipped with a high-stability femtosecond laser frequency comb, the laser frequency measuring device provided by the invention has high utilization efficiency and is convenient to rapidly realize the frequency measurement of double-wavelength or multi-wavelength laser.
Description
Technical field
The present invention relates to a kind of laser frequency measurement device and method, particularly a kind of light comb frequency measuring device and method that is used for the femtosecond laser frequency measurement belongs to femtosecond laser frequency measurement technical field.
Background technology
Laser frequency measurement one is directly subordinate to the major issue in the measurement basis subject of forward position, frequency of light wave is difficult to measure with general electronics method, and the femtosecond laser frequency that occurred in 1978 comb technology, experience the contact of having set up after the fast development for many years between light wave and the microwave frequency, successfully realized the accurate measurement of laser frequency.2005, breadboard John L.Hall of U.S. JILA and the general breadboard T.W.Hansch of German horse were honoured with Nobel Prize in physics because of the outstanding contributions in this field.
Along with the maturation development and the application of femtosecond laser light comb technology, it also increases in the demand aspect metering scientific research and the engineering thereupon.But the femtosecond light comb frequency measuring device that in the past was configured to the laser optical frequency measurement comprises single arrowband high reflective mirror, has not only wasted a large amount of useful optical frequency composition in the femtosecond light comb with wide spectral characteristics, but also is unfavorable for improving the efficiency of measurement of laser frequency.
In recent years, relevant scholar has invented and has utilized the surface optical field enhancement effect to produce the method for ultraviolet optical frequency comb by the higher hamonic wave process in nonlinear medium, utilize femtosecond high repetition frequency laser when satisfying the incident angle of resonant condition, in grating surface and plasma wave resonance, the higher hamonic wave that forms in nonlinear medium produces ultraviolet comb by light field.Also have the researcher to invent a kind of technology that adopts level Four optical fiber cascade amplification method to obtain the high power optical frequency comb.The frequency comb laser of utmost point low average power can be amplified to above the hectowatt magnitude.The researcher is also arranged at short problem femtosecond laser frequency comb stabilization time, invented a kind of method for making and equipment of high stable high repetition frequency monolithic femtosecond laser frequency comb.Main method is for using femto second titanium jewel oscillator output high repetition frequency, the following femtosecond pulse of 7fs, produce femtosecond pulse CEO by monolithic nonlinear crystal difference frequency, utilize the femtosecond optical frequency com of circuit feedback technique again repetition frequency and CEO frequency lock.Advantages such as this device has compact conformation, and locking time is long, and output available horsepower height, phase noise are little can be widely used in the optical frequency absolute measurement, constitute in the scientific researches such as light clock and Ah second's generation.
In the technology of above-mentioned relevant femtosecond laser frequency comb, major part all is about being used for producing the optical frequency com of different frequency, how improving the problem of femtosecond laser frequency comb power in addition.Yet in femtosecond laser frequency comb frequency measurement process, shortcomings such as the repetition frequency of ubiquity femtosecond laser frequency comb and carrier envelope phase shift (CEO) long-time stability are poor, measurement cost height, and do not relate to the problem that how to improve frequency measurement efficient.
Summary of the invention
The objective of the invention is to improve the frequency measurement efficient of femtosecond optical frequency carding device, proposed a kind of laser frequency measurement device and method in order to overcome the deficiencies in the prior art.
The present invention is achieved by the following technical solutions.
A kind of laser frequency measurement device of the present invention is made up of femtosecond laser frequency carding device, laser pulse compression apparatus, spectrum widening device, first completely reflecting mirror, the quartzy grating of transmission-type and completely reflecting mirror group, the first beat frequency light path, the second beat frequency light path, first data collector and second data collector supporting with it;
The supporting completely reflecting mirror group of the quartzy grating of above-mentioned and transmission-type comprises second completely reflecting mirror, the 3rd completely reflecting mirror and the 4th completely reflecting mirror;
The femtosecond pulse that sends in the laser cavity of femtosecond laser frequency carding device carries out to it through laser pulse compression apparatus that pulse compression is laggard goes into the spectrum widening device, by the spectrum widening device it is carried out arriving first completely reflecting mirror behind the spread spectrum, first completely reflecting mirror is with beam reflection to the second completely reflecting mirror, reflex to the quartzy grating of transmission-type through second completely reflecting mirror again, behind the quartzy grating of transmission-type, be divided into two different bundle laser of optical frequency, wherein a branch ofly after the 3rd completely reflecting mirror reflexes to the first beat frequency light path, its optical frequency is tested and gathered, by second data collector its optical frequency is tested and gathered after another Shu Jingdi four completely reflecting mirrors reflex to the second beat frequency light path by first data collector;
Above-mentioned laser pulse compression apparatus by prism to forming with chirped mirror or forming by grating pair; Laser pulse compression apparatus compresses the pulsed light in the femtosecond laser frequency carding device laser cavity, and it is compressed to scope between ten femtoseconds to two, ten femtoseconds, to reach the effect that enlarges the ultrashort pulse spectral range;
Above-mentioned spectrum widening device comprises microcobjective and photonic crystal fiber, and microcobjective and photonic crystal fiber are installed on the high-precision three-dimensional mobile platform; The method that the femtosecond pulse of spectrum widening device after to compression carries out spectrum widening is specially by the femtosecond pulse after will compressing and is injected in the photonic crystal fiber, utilizes the nonlinear effect of photonic crystal fiber that femtosecond pulse is carried out further spread spectrum;
The quartzy grating of above-mentioned transmission-type is the quartzy grating of the high density 1x2 transmission-type that adopts the micronano optical fabrication techniques, and its effect is the Gaussian peak beam split to different wave length in the femtosecond light comb spectrum, and can realize high efficiency transmission; The manufacturing process of the quartzy grating of transmission-type is:
1) utilize holographic technique to write down high dencity grating scribbling on the chromium film of positive photoetching rubber;
2) grating that step 1) write down is developed;
3) spend chrome liquor the photoetching grating pattern is transferred on the chromium film, and use chemical method that residual photoresist is removed, make the grating masterplate;
4) utilize the microelectronics etching technics, the grating masterplate of step 3) making is put into inductively coupled plasma etching machine carry out etching, further remove the residue chromium on the quartz substrate again, promptly be made into the quartzy grating of required high efficiency transmission formula.
A kind of optical frequency measurement device of the present invention, wherein quartzy grating of transmission-type and supporting completely reflecting mirror group thereof can be replaced by the first arrowband high reflective mirror and the second arrowband high reflective mirror, the laser of a certain specified wavelength that the first arrowband high reflective mirror and the second arrowband high reflective mirror pair and its each autoregressive parameter are corresponding respectively efficiently reflects, and to the laser high efficiency transmission of its commplementary wave length; The light beam that incide first completely reflecting mirror this moment is reflected onto the first arrowband high reflective mirror, through being divided into two bundles behind the first arrowband high reflective mirror: wherein a branch ofly by first data collector its optical frequency is tested and gathered after being reflected onto the first beat frequency light path, another bundle is transmitted to the second arrowband high reflective mirror, by second data collector its optical frequency is tested and is gathered after reflexing to the second beat frequency light path by the second arrowband high reflective mirror.
A kind of laser frequency measurement device of the present invention, the step of its frequency measuring method is:
1) by high precision phase locking frequency stabilized circuit module, the repetition frequency and the deviation frequency of femtosecond laser frequency carding device locked onto on the atomic clock frequency, it is stable for a long time that the femtosecond optical frequency is in, and is convenient to the absolute frequency of accurate and reliable measurement optical frequency to be measured;
2) by regulating the high-precision three-dimensional mobile platform, adjust the position of microcobjective and photonic crystal fiber in the spectrum widening device, make the femtosecond laser energy maximum of injecting photonic crystal fiber, can be by observing the height of judging coupling efficiency from the light intensity of photonic crystal fiber outgoing;
3) control the femtosecond pulse width by the regulating impulse compression set, and then influence crest location in the wide spectral domain and quantity in the femtosecond pulse, be specially:
If 3.1 the regulating impulse compression set by prism to forming with chirped mirror, control the femtosecond pulse width by regulating the insertion amount of one of them prism in light path;
3.2 if the regulating impulse compression set is made up of grating pair, control the femtosecond pulse width by the spacing of regulating grating pair;
4) start the laser frequency measurement device, implement laser frequency measurement.
Beneficial effect
A kind of laser frequency measurement device of the present invention, compact conformation, easy to operate, easy of integrationization, low, the applying flexible of cost, the laser frequency measurement that not only can be used for visible-range, can also be used for infrared and the precision measurement Ultra-Violet Laser frequency, effectively utilized each wavelength components in the femtosecond light comb wide range, the frequency measurement system of the femtosecond laser frequency comb of high stable was used in contrast in the past, had higher utilization ratio, was convenient to realize fast the frequency measurement of dual wavelength even multiwavelength laser.
Description of drawings
Fig. 1 is the structural representation of embodiments of the invention 1;
Wherein, L1 is the femtosecond laser frequency carding device, C1 is a laser pulse compression apparatus, S1 is the spectrum widening device, M1, M2, M3 and M4 are respectively first completely reflecting mirror, second completely reflecting mirror, the 3rd completely reflecting mirror and the 4th completely reflecting mirror, G1 is the quartzy grating of transmission-type, and A1 and A2 be the first beat frequency light path and the second beat frequency light path respectively, and B1 and B2 are respectively first data collector and second data collector;
Fig. 2 is among the embodiment 1, in femtosecond laser frequency comb in the wide spectral range, at the quartzy grating diffration efficiency diagram of transmission-type of the light design of wavelength 633 nanometers;
Fig. 3 is among the embodiment 1, in femtosecond laser frequency comb in the wide spectral range, at the quartzy grating diffration efficiency diagram of transmission-type of the light design of wavelength 613 nanometers;
Fig. 4 is the structural representation of embodiments of the invention 2;
Wherein, L1 is the femtosecond laser frequency carding device, C1 is a laser pulse compression apparatus, S1 is the spectrum widening device, M1 is first completely reflecting mirror, M5 and M6 are respectively the first arrowband high reflective mirror and the second arrowband high reflective mirror, and A1 and A2 be the first beat frequency light path and the second beat frequency light path respectively, and B1 and B2 are respectively first data collector and second data collector.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
A kind of laser frequency measurement device, as shown in Figure 1, form by femtosecond laser frequency carding device, laser pulse compression apparatus, spectrum widening device, first completely reflecting mirror, the quartzy grating of transmission-type, second completely reflecting mirror, the 3rd completely reflecting mirror, the 4th completely reflecting mirror, the first beat frequency light path, the second beat frequency light path, first data collector and second data collector;
The femtosecond pulse that sends in the laser cavity of femtosecond laser frequency carding device carries out to it through laser pulse compression apparatus that pulse compression is laggard goes into the spectrum widening device, by the spectrum widening device it is carried out arriving first completely reflecting mirror behind the spread spectrum, first completely reflecting mirror is with beam reflection to the second completely reflecting mirror, reflex to the quartzy grating of transmission-type through second completely reflecting mirror again, behind the quartzy grating of transmission-type, be divided into two different bundle laser of optical frequency, wherein a branch ofly after the 3rd completely reflecting mirror reflexes to the first beat frequency light path, its optical frequency is tested and gathered, by second data collector its optical frequency is tested and gathered after another Shu Jingdi four completely reflecting mirrors reflex to the second beat frequency light path by first data collector;
Above-mentioned laser pulse compression apparatus by prism to forming with chirped mirror, laser pulse compression apparatus compresses the pulsed light in the femtosecond laser frequency carding device laser cavity, it is compressed to scope between ten femtoseconds to two, ten femtoseconds, to reach the effect that enlarges the ultrashort pulse spectral range;
Above-mentioned spectrum widening device comprises microcobjective and photonic crystal fiber, and microcobjective and photonic crystal fiber are installed on the high-precision three-dimensional mobile platform; The method that the femtosecond pulse of spectrum widening device after to compression carries out spectrum widening is specially by the femtosecond pulse after will compressing and is injected in the photonic crystal fiber, utilizes the nonlinear effect of photonic crystal fiber that femtosecond pulse is carried out further spread spectrum;
The quartzy grating of above-mentioned transmission-type is the quartzy grating of the high density 1x2 transmission-type that adopts the micronano optical fabrication techniques, grating dutycycle f=0.5, cycle d scope is 1＜d＜2 micron, degree of depth h scope is 0.8＜h＜1.2 micron, its effect is the Gaussian peak beam split to different wave length in the femtosecond light comb spectrum, and can realize high efficiency transmission; The manufacturing process of the quartzy grating of transmission-type is:
1) utilize holographic technique to write down high dencity grating scribbling on the chromium film of positive photoetching rubber, the model of the positive photoetching rubber that is adopted is Shipley S1818;
2) grating that step 1) write down is developed;
3) spend chrome liquor the photoetching grating pattern is transferred on the chromium film, and use chemical method that residual photoresist is removed, make the grating masterplate;
4) utilize the microelectronics etching technics, the grating masterplate of step 3) making is put into inductively coupled plasma etching machine carry out etching, further remove the residue chromium on the quartz substrate again, promptly be made into the quartzy grating of required high efficiency transmission formula.
The dutycycle f=0.5 of grating in the present embodiment 1, cycle d=1.144 micron, degree of depth h=0.86 micron is that the light of 633 nanometers and 613 nanometers has high-level efficiency transmission effect to wavelength, can also allow two-beam spatially separate.
A kind of laser frequency measurement device of present embodiment 1, the step of its frequency measuring method is:
1) by high precision phase locking frequency stabilized circuit module, the repetition frequency and the deviation frequency of femtosecond laser frequency carding device locked onto on the atomic clock frequency, it is stable for a long time that the femtosecond optical frequency is in, and is convenient to the absolute frequency of accurate and reliable measurement optical frequency to be measured;
2) by regulating the high-precision three-dimensional mobile platform, adjust the position of microcobjective and photonic crystal fiber in the spectrum widening device, make the femtosecond laser energy maximum of injecting photonic crystal fiber, can be by observing the height of judging coupling efficiency from the light intensity of photonic crystal fiber outgoing;
3) control the femtosecond pulse width by the regulating impulse compression set, and then influence crest location in the wide spectral domain and quantity in the femtosecond pulse, the insertion amount of prism of prism centering in light path that is specially the regulating impulse compression set controlled the femtosecond pulse width, makes the peak of femtosecond pulse be in 633 nanometers and 613 nanometers;
4) start the laser frequency measurement device, implement laser frequency measurement.
In the present embodiment, in femtosecond laser frequency comb in the wide spectral range, the high efficiency transmission formula grating diffration efficiency diagram that designs at wavelength 633 nanometers and 613 nano wave lengths respectively as shown in Figures 2 and 3.
Embodiment 2
A kind of laser frequency measurement device, as shown in Figure 1, form by femtosecond laser frequency carding device, laser pulse compression apparatus, spectrum widening device, first completely reflecting mirror, the first arrowband high reflective mirror, the second arrowband high reflective mirror, the first beat frequency light path, the second beat frequency light path, first data collector and second data collector;
The above-mentioned first arrowband high reflective mirror is that the light of 633 nanometers efficiently reflects to wavelength, and to the light high efficiency transmission of 729 nanometers;
The above-mentioned second arrowband high reflective mirror is that the light of 729 nanometers efficiently reflects to wavelength, and to the light high efficiency transmission of 633 nanometers;
The femtosecond pulse that sends in the laser cavity of femtosecond laser frequency carding device carries out to it through laser pulse compression apparatus that pulse compression is laggard goes into the spectrum widening device, by the spectrum widening device it is carried out arriving first completely reflecting mirror behind the spread spectrum, the light beam that incides first completely reflecting mirror is reflected onto the first arrowband high reflective mirror, through being divided into two bundles behind the first arrowband high reflective mirror: wherein the light beam of 633 nanometers is tested and is gathered its optical frequency by first data collector after being reflected onto the first beat frequency light path, the light beam of 729 nanometers is transmitted to the second arrowband high reflective mirror, by second data collector its optical frequency is tested and is gathered after reflexing to the second beat frequency light path by the second arrowband high reflective mirror;
Above-mentioned laser pulse compression apparatus is made up of grating pair, laser pulse compression apparatus compresses the pulsed light in the femtosecond laser frequency carding device laser cavity, it is compressed to scope between ten femtoseconds to two, ten femtoseconds, to reach the effect that enlarges the ultrashort pulse spectral range;
Above-mentioned spectrum widening device comprises microcobjective and photonic crystal fiber, and microcobjective and photonic crystal fiber are installed on the high-precision three-dimensional mobile platform; The method that the femtosecond pulse of spectrum widening device after to compression carries out spectrum widening is specially by the femtosecond pulse after will compressing and is injected in the photonic crystal fiber, utilizes the nonlinear effect of photonic crystal fiber that femtosecond pulse is carried out further spread spectrum;
A kind of laser frequency measurement device of present embodiment 2, the step of its frequency measuring method is:
1) by high precision phase locking frequency stabilized circuit module, the repetition frequency and the deviation frequency of femtosecond laser frequency carding device locked onto on the atomic clock frequency, it is stable for a long time that the femtosecond optical frequency is in, and is convenient to the absolute frequency of accurate and reliable measurement optical frequency to be measured;
2) by regulating the high-precision three-dimensional mobile platform, adjust the position of microcobjective and photonic crystal fiber in the spectrum widening device, make the femtosecond laser energy maximum of injecting photonic crystal fiber, can be by observing the height of judging coupling efficiency from the light intensity of photonic crystal fiber outgoing;
3) control the femtosecond pulse width by the regulating impulse compression set, and then influence crest location in the wide spectral domain and quantity in the femtosecond pulse, be specially the spacing of regulating grating pair and control the femtosecond pulse width, make the peak of femtosecond pulse be in 633 nanometers and 729 nanometers;
4) start the laser frequency measurement device, implement laser frequency measurement.
The above is preferred embodiment of the present invention, and the present invention should not be confined to the disclosed content of this embodiment and accompanying drawing.Everyly do not break away from the equivalence of finishing under the spirit disclosed in this invention or revise, all fall into the scope of protection of the invention.
Claims (9)
1. a laser frequency measurement device is characterized in that: be made up of femtosecond laser frequency carding device, laser pulse compression apparatus, spectrum widening device, first completely reflecting mirror, the quartzy grating of transmission-type and completely reflecting mirror group, the first beat frequency light path, the second beat frequency light path, first data collector and second data collector supporting with it;
The supporting completely reflecting mirror group of the quartzy grating of above-mentioned and transmission-type comprises second completely reflecting mirror, the 3rd completely reflecting mirror and the 4th completely reflecting mirror;
The femtosecond pulse that sends in the laser cavity of femtosecond laser frequency carding device carries out to it through laser pulse compression apparatus that pulse compression is laggard goes into the spectrum widening device, by the spectrum widening device it is carried out arriving first completely reflecting mirror behind the spread spectrum, first completely reflecting mirror is with beam reflection to the second completely reflecting mirror, reflex to the quartzy grating of transmission-type through second completely reflecting mirror again, behind the quartzy grating of transmission-type, be divided into two different bundle laser of optical frequency, wherein a branch ofly after the 3rd completely reflecting mirror reflexes to the first beat frequency light path, its optical frequency is tested and gathered, by second data collector its optical frequency is tested and gathered after another Shu Jingdi four completely reflecting mirrors reflex to the second beat frequency light path by first data collector;
Above-mentioned spectrum widening device comprises microcobjective and photonic crystal fiber, and microcobjective and photonic crystal fiber are installed on the high-precision three-dimensional mobile platform; The method that the femtosecond pulse of spectrum widening device after to compression carries out spectrum widening is specially by the femtosecond pulse after will compressing and is injected in the photonic crystal fiber, utilizes the nonlinear effect of photonic crystal fiber that femtosecond pulse is carried out further spread spectrum;
The quartzy grating of above-mentioned transmission-type is the quartzy grating of the high density 1x2 transmission-type that adopts the micronano optical fabrication techniques.
2. a kind of laser frequency measurement device according to claim 1 is characterized in that: the dutycycle f=0.5 of the quartzy grating of described transmission-type, and cycle d scope is 1＜d＜2 micron, and degree of depth h scope is 0.8＜h＜1.2 micron, and its manufacturing process is:
1) utilize holographic technique to write down high dencity grating scribbling on the chromium film of positive photoetching rubber;
2) grating that step 1) write down is developed;
3) spend chrome liquor the photoetching grating pattern is transferred on the chromium film, and use chemical method that residual photoresist is removed, make the grating masterplate;
4) utilize the microelectronics etching technics, the grating masterplate of step 3) making is put into inductively coupled plasma etching machine carry out etching, further remove the residue chromium on the quartz substrate again, promptly be made into the quartzy grating of required high efficiency transmission formula.
3. a kind of laser frequency measurement device according to claim 2 is characterized in that: the model of described positive photoetching rubber is Shipley S1818.
4. a kind of laser frequency measurement device according to claim 2, it is characterized in that: the dutycycle f=0.5 of the quartzy grating of described transmission-type, cycle d=1.144 micron, degree of depth h=0.86 micron is that the light of 633 nanometers and 613 nanometers has high-level efficiency transmission effect and two-beam is spatially separated to wavelength.
5. a kind of laser frequency measurement device according to claim 1, it is characterized in that: quartzy grating of described transmission-type and supporting completely reflecting mirror group thereof can be replaced by the first arrowband high reflective mirror and the second arrowband high reflective mirror, the laser of a certain specified wavelength that the first arrowband high reflective mirror and the second arrowband high reflective mirror pair and its each autoregressive parameter are corresponding respectively efficiently reflects, and to the laser high efficiency transmission of its commplementary wave length;
The light beam that incide first completely reflecting mirror this moment is reflected onto the first arrowband high reflective mirror, through being divided into two bundles behind the first arrowband high reflective mirror: wherein a branch ofly by first data collector its optical frequency is tested and gathered after being reflected onto the first beat frequency light path, another bundle is transmitted to the second arrowband high reflective mirror, by second data collector its optical frequency is tested and is gathered after reflexing to the second beat frequency light path by the second arrowband high reflective mirror.
6. a kind of according to claim 1 or 5 laser frequency measurement device is characterized in that: described laser pulse compression apparatus by prism to forming with chirped mirror.
7. the frequency measurement method of a kind of laser frequency measurement device according to claim 6 is characterized in that the steps include:
1) by high precision phase locking frequency stabilized circuit module, the repetition frequency and the deviation frequency of femtosecond laser frequency carding device locked onto on the atomic clock frequency, it is stable for a long time that the femtosecond optical frequency is in, and is convenient to the absolute frequency of accurate and reliable measurement optical frequency to be measured;
2) by regulating the high-precision three-dimensional mobile platform, adjust the position of microcobjective and photonic crystal fiber in the spectrum widening device, make the femtosecond laser energy maximum of injecting photonic crystal fiber, can be by observing the height of judging coupling efficiency from the light intensity of photonic crystal fiber outgoing;
3) control the femtosecond pulse width by the insertion amount of prism of prism centering in light path of regulating the regulating impulse compression set, and then influence crest location in the wide spectral domain and quantity in the femtosecond pulse;
4) start the laser frequency measurement device, implement laser frequency measurement.
8. a kind of according to claim 1 or 5 laser frequency measurement device, it is characterized in that: described laser pulse compression apparatus is made up of grating pair.
9. the frequency measurement method of a kind of laser frequency measurement device according to claim 8 is characterized in that the steps include:
1) by high precision phase locking frequency stabilized circuit module, the repetition frequency and the deviation frequency of femtosecond laser frequency carding device locked onto on the atomic clock frequency, it is stable for a long time that the femtosecond optical frequency is in, and is convenient to the absolute frequency of accurate and reliable measurement optical frequency to be measured;
2) by regulating the high-precision three-dimensional mobile platform, adjust the position of microcobjective and photonic crystal fiber in the spectrum widening device, make the femtosecond laser energy maximum of injecting photonic crystal fiber, can be by observing the height of judging coupling efficiency from the light intensity of photonic crystal fiber outgoing;
3) spacing of the adjusting grating pair by regulating the regulating impulse compression set is controlled the femtosecond pulse width, and then influences crest location in the wide spectral domain and quantity in the femtosecond pulse;
4) start the laser frequency measurement device, implement laser frequency measurement.
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| CN102638302A (en) * | 2012-03-20 | 2012-08-15 | 北京邮电大学 | Coherent light frequency comb based channelized broadband multi-frequency measuring system |
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| CN107024285A (en) * | 2017-04-28 | 2017-08-08 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of full optical fiber laser frequency measuring equipment and method |
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| CN109343031B (en) * | 2018-09-14 | 2021-04-02 | 上海无线电设备研究所 | Double-flying-second optical comb frequency stabilizing system for measuring space absolute distance |
| CN112033551A (en) * | 2020-09-04 | 2020-12-04 | 中国航空工业集团公司北京长城计量测试技术研究所 | Wavelength measuring device and method for broadband tunable laser |
| CN112213938A (en) * | 2020-10-12 | 2021-01-12 | 成都天奥电子股份有限公司 | Optical frequency atomic clock |
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