CN105762628A - Longitudinal mode drift compensation device and method for laser - Google Patents
Longitudinal mode drift compensation device and method for laser Download PDFInfo
- Publication number
- CN105762628A CN105762628A CN201610236778.1A CN201610236778A CN105762628A CN 105762628 A CN105762628 A CN 105762628A CN 201610236778 A CN201610236778 A CN 201610236778A CN 105762628 A CN105762628 A CN 105762628A
- Authority
- CN
- China
- Prior art keywords
- etalon
- resonator cavity
- longitudinal mode
- laser
- light path
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08018—Mode suppression
- H01S3/08022—Longitudinal modes
- H01S3/08031—Single-mode emission
- H01S3/08036—Single-mode emission using intracavity dispersive, polarising or birefringent elements
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
- Lasers (AREA)
Abstract
The embodiment provides a longitudinal mode drift compensation device and method for a laser, and the device comprises an etalon arranged in a resonant cavity, a wavelength detection module, a central control system and a controller; the etalon is used for adjusting the light path of the resonant cavity to compensate the longitudinal mode drift of the laser; the wavelength detection module is used for detecting the wavelength of the output laser of the resonant cavity; the central control system is used for obtaining the longitudinal mode drift distance of the resonant cavity according to the wavelength of the output laser and generating a feedback signal according to the longitudinal mode drift distance to the controller; and the controller is used for adjusting the etalon according to the feedback signal. According to the invention, compensation of the longitudinal mode drift of the laser can be realized, the device has low cost and low technical difficulty, the device is easy to manufacture, and the device can compensate the long-term drift of laser longitudinal mode and more than 10 MHz magnitude of noise.
Description
Technical field
The present invention relates to all-solid state laser technical field, particularly relate to the longitudinal mode drift compensation device and method of a kind of laser instrument.
Background technology
By all solid state laser (DPL) of laser diode (LD) pumping owing to its conversion efficiency height, compact conformation, system stability, long service life and the advantage such as easy to maintenance are widely used.Prior art mainly has for the compensation method of longitudinal mode skew: adopt PDH method to gather the longitudinal mode offset setting value of laser instrument driving pressure electroceramics (PZT), change chamber length to compensate the skew of longitudinal mode, it is possible to achieve fabulous wavelength stability.
And the system of compensation method for realizing the skew of above-mentioned longitudinal mode is complex, laser instrument including a stable output does frequency standard, light frequency carrier signal is produced with electrooptic modulator (EOM), reflected optical power is detected by photoelectric probe, electrooptic modulator is driven with signal generator, process detectable signal with mixting circuit process, adopt pid algorithm output feedback signal, and finally drive the skew with compensation resonant cavity longitudinal mode of stretching of PZT.Long-time stability and the short-term stability of laser instrument are had good compensating action by it.But, this system structure is complicated, and number of devices is many, and technical difficulty is high, and high performance PZT, EOM and stable lasing light emitter all expensive, be mainly used in continuously or quasi-continuous lasing.Laser instrument for pulse operating mostly adopts ramp-and-fire method to realize longitudinal mode locking at present, first it is adopt PZT to regulate some mirror position, chamber, then adopt intracavity Q-switch when opening resonator cavity for the resonance signal of the seed light of certain polarization direction as initial starting point, open Q-switch, thus realizing the output of single longitudinal mode.The present invention can hold concurrently and realize continuous or pulse signal locking.
Summary of the invention
Defect for prior art, the invention provides the longitudinal mode drift compensation device and method of a kind of laser instrument, can solve the problem that longitudinal mode drift compensating system structure of the prior art is complicated, cost is high, technology requires high problem, it is possible to the long-term drift of laser longitudinal mode and the noise of more than 10MHz magnitude are compensated.
First aspect, the invention provides the longitudinal mode drift compensation device of a kind of laser instrument, including: it is arranged at the etalon in resonator cavity, wavelength detecting module, central control system and controller；
Described etalon, the light path for adjusting described resonator cavity drifts about with the longitudinal mode compensating laser instrument；
Described wavelength detecting module, for detecting the wavelength of the Output of laser of described resonator cavity；
Described central control system, is connected with described wavelength detecting module, obtains the longitudinal mode drift value of described resonator cavity for the wavelength according to described Output of laser, and generates feedback signal extremely described controller according to described longitudinal mode drift value；
Described controller, is connected with described central control system, for regulating described etalon according to described feedback signal.
Preferably, described controller includes: the electrical turntable being connected with described etalon or Piezoelectric Driving turntable, for regulating the angle of described etalon according to described feedback signal, to adjust the light path of described resonator cavity；
The light path of described resonator cavity is:
Wherein, LoplFor the light path of described resonator cavity, L is the former length of described resonator cavity, and d is the thickness of described etalon, and n is the refractive index of described etalon, and θ is the angle of incidence for described etalon of the light in described resonator cavity.
Preferably, described controller includes: temperature controlling stove, for regulating the temperature of described etalon according to described feedback signal, to adjust the light path of described resonator cavity；
The light path of described resonator cavity is:
Wherein, LoplFor the light path of described resonator cavity, L is the former length of described resonator cavity, and d is the thickness of described etalon, and n is the refractive index of described etalon, and θ is the angle of incidence for described etalon of the light in described resonator cavity, and d and n is the monotonic function of temperature.
Preferably, described etalon is: uncoated etalon, or is coated with the etalon of high transmittance film.
Preferably, when described etalon is uncoated etalon, the light in described resonator cavity is Brewster's angle for the angle of incidence of described etalon；
When described etalon is the etalon being coated with high transmittance film, the light in described resonator cavity is 0 ° for the angle of incidence of described etalon.
Preferably, described wavelength detecting module is band meter, or has the steam bubble of fine-structure levels structure and the wavelength monitoring system of the absorption spectra of the vapor atoms comprising laser line or ion.
Preferably, described central control system, specifically for:
According to described longitudinal mode drift value, pid algorithm is adopted to generate feedback signal and export to described controller.
Preferably, described resonator cavity is standing-wave cavity or annular chamber.
Second aspect, the invention provides the longitudinal mode drift compensation method of a kind of longitudinal mode drift compensation device based on any one laser instrument above-mentioned, and described method includes:
The wavelength of the Output of laser of wavelength detecting module detection resonator cavity；
Central control system obtains the longitudinal mode drift value of described resonator cavity according to the wavelength of described Output of laser, generates feedback signal according to described longitudinal mode drift value, and exports to controller；
Described controller regulates described etalon according to described feedback signal, to adjust the light path of described resonator cavity, it is achieved the compensation of the longitudinal mode drift of laser instrument.
Preferably, described controller regulates described etalon according to described feedback signal, to adjust the light path of described resonator cavity, it is achieved the compensation of the longitudinal mode drift of laser instrument, including:
Described controller regulates angle or the temperature of described etalon according to described feedback signal, to adjust the light path of described resonator cavity；
The light path of described resonator cavity is:
Wherein, LoplFor the light path of described resonator cavity, L is the former length of described resonator cavity, and d is the thickness of described etalon, and n is the refractive index of described etalon, and θ is the angle of incidence for described etalon of the light in described resonator cavity, and d and n is the monotonic function of temperature.
As shown from the above technical solution, the present invention provides the longitudinal mode drift compensation device and method of a kind of laser instrument, the wavelength of the Output of laser of resonator cavity is detected by wavelength detecting module, central control system obtains the longitudinal mode drift value of described resonator cavity according to described Output of laser wavelength, according to described longitudinal mode drift value generation feedback signal to controller, controller regulates described etalon according to described feedback signal, to adjust the light path of described resonator cavity, it is achieved thereby that the compensation of the longitudinal mode drift of laser instrument.Thus, cost of the present invention is low, technical difficulty is low and device is simple and easy to get, solve and prior art regulates the problem that apparatus structure is complicated, cost is high, technology requirement is high, it is possible to the long-term drift of laser longitudinal mode and the noise of more than 10MHz magnitude are compensated.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these figure；
Fig. 1 is the structural representation of a kind of annular chamber inserting etalon that one embodiment of the invention provides；
Fig. 2 is the structural representation of a kind of standing-wave cavity inserting etalon that another embodiment of the present invention provides；
Fig. 3 is the structural representation of the longitudinal mode drift compensation device of a kind of laser instrument that the embodiment of the present invention 1 provides；
Fig. 4 is the structural representation of the longitudinal mode drift compensation device of a kind of laser instrument that the embodiment of the present invention 2 provides；
Fig. 5 is the structural representation of the longitudinal mode drift compensation device of a kind of laser instrument that the embodiment of the present invention 3 provides；
Fig. 6 is the schematic flow sheet of the longitudinal mode drift compensation method of a kind of laser instrument that one embodiment of the invention provides；
Description of symbols in Fig. 1～Fig. 5: 1-etalon；The uncoated etalon of 1-01-；1-02-is coated with the etalon of high transmittance film；2-01-the first chamber mirror；2-02-the second chamber mirror；2-03-the 3rd chamber mirror；3-completely reflecting mirror；4-band meter；5-is controlled computer；6-electrical turntable and driver；7-monoblock and non-planar annular cavity laser.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
One embodiment of the invention provides the longitudinal mode drift compensation device of a kind of laser instrument, and this device includes: be arranged at the etalon in resonator cavity, wavelength detecting module, central control system and controller.
Wherein, described etalon, the light path for adjusting described resonator cavity drifts about with the longitudinal mode compensating laser instrument；Described wavelength detecting module, for detecting the wavelength of the Output of laser of described resonator cavity；Described central control system, is connected with described wavelength detecting module, obtains the longitudinal mode drift value of described resonator cavity for the wavelength according to described Output of laser, and generates feedback signal extremely described controller according to described longitudinal mode drift value；Described controller, is connected with described central control system, for regulating described etalon according to described feedback signal.
Wherein, the material of etalon can be quartz, without silhydrite, JGS1, JGS2, JGS3 etc. and YAG, YVO4, the laser host material such as GSGG, GYSGG.
As can be seen here, the longitudinal mode drift compensation device of the laser instrument that the present embodiment provides, the wavelength of the Output of laser of resonator cavity is detected by wavelength detecting module, central control system obtains the longitudinal mode drift value of described resonator cavity according to described Output of laser wavelength, according to described longitudinal mode drift value generation feedback signal to controller, controller regulates described etalon according to described feedback signal, to adjust the light path of described resonator cavity, it is achieved thereby that the compensation of the longitudinal mode drift of laser instrument.Thus, cost of the present invention is low, technical difficulty is low and device is simple and easy to get, solve and prior art regulates the problem that apparatus structure is complicated, cost is high, technology requirement is high, it is possible to the long-term drift of laser longitudinal mode and the noise of more than 10MHz magnitude are compensated.
In an alternate embodiment of the present invention where, the controller in above-described embodiment, specifically for regulating angle or the temperature of described etalon, to adjust the light path of described resonator cavity according to described feedback signal.
For example, when controller is for the angle according to the described feedback signal described etalon of adjustment, described controller comprises the steps that the electrical turntable being connected with described etalon or Piezoelectric Driving turntable, for regulating the angle of described etalon according to described feedback signal, to adjust the light path of described resonator cavity.Specifically, described etalon is fixed on electrical turntable or Piezoelectric Driving turntable.
Wherein, the light path of described resonator cavity is:
Wherein, LoplFor the light path of described resonator cavity, L is the former length of described resonator cavity, and d is the thickness of described etalon, and n is the refractive index of described etalon, and θ is the angle of incidence for described etalon of the light in described resonator cavity.
As can be seen here, light path is the function of incidence angle θ, and when continuously adjusting incidence angle θ to a direction, light path consecutive variations, to realize the compensation to longitudinal mode drift value.And when adopting the angle that electrical turntable or Piezoelectric Driving turntable regulate described etalon, incidence angle θ changes therewith.
Preferably, the step-length of electrical turntable or Piezoelectric Driving turntable is less than 1m °, even up to 100 μ °.
For example, when controller is for the temperature according to the described feedback signal described etalon of adjustment, described controller includes: temperature controlling stove, for regulating the temperature of described etalon according to described feedback signal, to adjust the light path of described resonator cavity.Specifically, described etalon is placed in temperature controlling stove.
The light path of described resonator cavity is:
Wherein, LoplLight path for described resonator cavity, L is the former length (being not provided with the light path before etalon) of described resonator cavity, and d is the thickness of described etalon, and n is the refractive index of described etalon, θ is the angle of incidence for described etalon of the light in described resonator cavity, and d and n is the monotonic function of temperature.
As can be seen here, the thickness of refractive index and described etalon is the monotonic function of temperature, then continuous print regulates temperature and can also realize continuously adjusting light path, to realize the compensation to longitudinal mode drift value.
Preferably, the adjustment step-length of temperature controlling stove and stability are respectively less than 0.1 DEG C.
Wherein, described resonator cavity can be standing-wave cavity or annular chamber.
Specifically, annular chamber schematic diagram as shown in Figure 1, including: etalon the 1, first chamber mirror 2-01, the second chamber mirror 2-02 and the 3rd chamber mirror 2-03.
Specifically, standing-wave cavity schematic diagram as shown in Figure 2, including: etalon the 1, first chamber mirror 2-01 and the second chamber mirror 2-02.
Wherein, described etalon can be: uncoated etalon, or is coated with the etalon of high transmittance film.Wherein, the etalon being coated with high transmittance film is the etalon that two sides is all coated with high transmittance film.
In an alternate embodiment of the present invention where, when described etalon is uncoated etalon, the light in described resonator cavity is Brewster's angle for the angle of incidence of described etalon.As it is shown in figure 1, namely incidence angle θ is set to Brewster's angle.So, when there being p light starting of oscillation in resonator cavity, uncoated etalon is inserted in resonator cavity, and when angle of incidence is Brewster's angle, it is possible to make p light reach minimum in the loss of resonator cavity.
Preferably, the thickness of uncoated etalon is less than 1mm.
When described etalon is the etalon being coated with high transmittance film, the light in described resonator cavity is 0 ° for the angle of incidence of described etalon, and namely incidence angle θ is set to 0 °.So, when the etalon being coated with high transmittance film inserts resonator cavity, it is possible to be left out the polarization direction of resonator cavity inner laser, and angle of incidence is set to 0 °, in order to obtain better reconciliation precision.
Preferably, the thickness of etalon of high transmittance film it is coated with less than 1mm.
In the present embodiment, described wavelength detecting module can be band meter, or has the steam bubble of fine-structure levels structure and the wavelength monitoring system of the absorption spectra of the vapor atoms comprising laser line or ion.Preferably, the precision of wavelength detecting device is less than 100MHz.
Further, described central control system, specifically for:
According to described longitudinal mode drift value, pid algorithm is adopted to generate feedback signal and export to described controller.So, it is possible so that stability is high.
It should be noted that central control system can be middle control computer, it is possible to adopting other algorithm output feedback signal, this is not any limitation as by the present embodiment.
In order to be illustrated more clearly that technical scheme, below the longitudinal mode drift compensation device of the laser instrument in several specific embodiments is described in further detail.
Embodiment 1
The longitudinal mode drift compensation device of laser instrument as shown in Figure 3, it is specially the device that the laser longitudinal mode of the uncoated FP of the brewster angle incidence of a kind of closed loop control is steady in a long-term, this device includes: etalon FP1-01, the first chamber mirror 2-01, the second chamber mirror 2-02, the 3rd chamber mirror 2-03, band meter 4, middle control computer 5, electrical turntable and driver 6.As can be seen here, in the present embodiment, resonator cavity is annular chamber, and etalon FP1-01 is uncoated etalon.
Specifically, band meter 4 detects the wavelength of the Output of laser of resonator cavity, middle control computer 5 obtains the longitudinal mode drift value of this resonator cavity according to the wavelength of described Output of laser, according to described longitudinal mode drift value generation feedback signal to electrical turntable and driver 6, electrical turntable and driver 6 regulate the angle of described etalon FP1-01 according to described feedback signal, to adjust in resonator cavity ray relative in the angle of incidence of described etalon FP1-01, adjust the light path of described resonator cavity further, thus realizing the compensation of the longitudinal mode drift of laser instrument.
Wherein, etalon FP1-01 is uncoated etalon, and the light in resonator cavity is along brewster angle incidence to etalon FP1-01.
Wherein, etalon FP1-01 thickness less than 1mm, described etalon FP1-01 material can be quartz, without silhydrite, JGS1 etc.；FP1-01 in the present embodiment selects 0.7mm thickness quartz glass.
Described etalon FP1-01 is of a size of Φ 25mm × 0.7mm.
In the present embodiment, the first chamber mirror 2-01, the second chamber mirror 2-02 and the 3rd chamber mirror 2-03 are disposed as JGS1 quartz glass, and size is Φ 25mm × 5mm.The light path of the first mirror 2-01 to second chamber, the chamber mirror 2-02 light path equal to the first chamber mirror 2-01 to the 3rd chamber mirror 2-03.The angle of reflection of the light of the second chamber mirror 2-02 and the three chamber Jing2-03Chu is 17.3 °.
In the present embodiment, described uncoated etalon FP1-01 incidence angle θ in resonator cavity is Brewster's angle 55.4 °, in order to when only p light starting of oscillation in resonator cavity, insertion loss is minimum.
In the present embodiment, the light path (i.e. chamber length) of resonator cavity is 300mm.After etalon FP1-01 inserts resonator cavity with Brewster's angle 55.4 °, during angular adjustment, etalon angle of incidence changes in the scope of 55 ° to 56 °, and correspondingly, change in optical path length is 300.436mm to 300.4413mm.Specifically, when electrical turntable is with 1m ° for turntable precision, light path degree of regulation is 5.3nm.
In the present embodiment, as it is shown on figure 3, the resolution of band meter 4 is less than 10MHz, when band meter 4 detects the wavelength of Output of laser, it is possible to measure continuously, it is also possible to impulsive measurement.
In the present embodiment, as it is shown on figure 3, middle control computer 5 can receive the measurement result of band meter 4, and adopting certain algorithm, it is preferable that pid algorithm, output feedback signal controls electrical turntable and driver 6, to control the angle of etalon FP1-01.
In the present embodiment, electrical turntable and driver 6, it is preferable that there is milli measurement level, the resolution of even sub-milli measurement level.
In the present embodiment, with 1064nm light for internal oscillation wavelength, the adjustment step number of single longitudinal mode spacing is 200.7 steps.Owing to longitudinal mode spacing is 1.03GHz, longitudinal modal stability is less than 5MHz.
Embodiment 2
The longitudinal mode drift compensation device of laser instrument as shown in Figure 4, it is specially the laser instrument injection locking device of the uncoated FP of the brewster angle incidence of a kind of closed loop control, this device includes: etalon FP1-01, the first chamber mirror 2-01, the second chamber mirror 2-02, the 3rd chamber mirror 2-03, completely reflecting mirror 3, band meter 4, middle control computer 5, electrical turntable and driver 6, monoblock and non-planar annular cavity laser 7.Wherein, etalon FP1-01 is uncoated etalon.
In the present embodiment, completely reflecting mirror 3 is incident upon band meter 4 for being all-trans by the Output of laser of resonator cavity.
Wherein, the thickness of etalon FP1-01 less than 1mm, described etalon FP1 material can be quartz, without silhydrite, JGS1 etc.；Etalon FP1-01 in the present embodiment selects 0.7mm thickness quartz glass.
Described etalon FP1-01 is of a size of Φ 25mm × 0.7mm.
In the present embodiment, the first chamber mirror 2-01 and the second mirror 2-02 and the three chamber, chamber mirror 2-03 is set to JGS1 quartz glass, is of a size of Φ 25mm × 5mm.The light path of the first chamber mirror 2-01 and the second chamber mirror 2-02 light path equal to the first mirror 2-01 and the three chamber, chamber mirror 2-03.The angle of reflection of the light of the second chamber mirror 2-02 and the three chamber Jing2-03Chu is 17.3 °.
In the present embodiment, described uncoated etalon FP1 incidence angle θ in resonator cavity is Brewster's angle 55.4 °, in order to when only p light starting of oscillation in resonator cavity, insertion loss is minimum.
In the present embodiment, the light path (i.e. chamber length) of resonator cavity is 300mm.After etalon FP1-01 inserts resonator cavity with Brewster's angle 55.4 °, during angular adjustment, etalon angle of incidence changes in the scope of 55 ° to 56 °, and correspondingly, change in optical path length is 300.436mm to 300.4413mm.Specifically, when electrical turntable is with 1m ° for turntable precision, light path degree of regulation is 5.3nm.
In the present embodiment, as shown in Figure 4, the resolution of band meter 4 is less than 10MHz, it is possible to measure continuously, it is also possible to impulsive measurement.
In the present embodiment, as shown in Figure 4, middle control computer 5 can receive the measurement result of band meter 4, and adopts certain algorithm, it is preferable that pid algorithm, and output feedback signal controls electrical turntable and driver 6, to control the angle of etalon FP1-01.
In the present embodiment, electrical turntable and driver 6, it is preferable that there is milli measurement level, the resolution of even sub-milli measurement level.
In the present embodiment, monoblock and non-planar annular cavity laser 7 is active laser device, it is preferable that wavelength stability should be less than 1MHz.
In the present embodiment, slave laser device includes: etalon FP1-01, the first chamber mirror 2-01, the second chamber mirror 2-02, the 3rd chamber mirror 2-03.Preferably, this slave laser device be placed in thermally-stabilised with on the optical table of isolating technique.
In the present embodiment, with 1064nm light for internal oscillation wavelength, the adjustment step number of single longitudinal mode spacing is 200.7 steps.Owing to longitudinal mode spacing is 1.03GHz, longitudinal mode stability is less than within the scope of 5MHz.
In the present embodiment, the longitudinal mode of slave laser device can be stablized further, except compensating chronic drift, additionally it is possible to adopts the quick oscillation of the quickly longitudinal mode of the driver compensation resonant cavity of response, thus realizing stable locking phenomena.
Embodiment 3
The longitudinal mode drift compensation device of laser instrument as shown in Figure 5, it is specially the device that the laser longitudinal mode of the FP being coated with high transmittance film 0 degree incident of a kind of closed loop control is steady in a long-term, this device includes: etalon FP1-02, the first chamber mirror 2-01, the second chamber mirror 2-02, the 3rd chamber mirror 2-03, band meter 4, middle control computer 5, electrical turntable and driver 6.As can be seen here, in the present embodiment, resonator cavity is annular chamber, and in resonator cavity, light is 0 degree for the angle of incidence of described etalon FP1-02.
Wherein, etalon FP1-02, it is preferable that etalon FP1-02 thickness less than 1mm, described etalon FP1-02 material can be quartz, without silhydrite, JGS1 etc.；Etalon FP1-02 in the present embodiment selects 0.7mm thickness quartz glass.
Wherein, described etalon FP1-02 is of a size of Φ 25mm × 0.7mm；As it is shown in figure 5, light is 0 degree for the angle of incidence of described etalon FP1-02 in resonator cavity, high degree of regulation now can be obtained.
In the present embodiment, the first chamber mirror 2-01, the second chamber mirror 2-02 and the 3rd chamber mirror 2-03 are disposed as JGS1 quartz glass, and size is Φ 25mm × 5mm.The light path of the first mirror 2-01 to second chamber, the chamber mirror 2-02 light path equal to the first chamber mirror 2-01 to the 3rd chamber mirror 2-03.The angle of reflection of the angle of reflection of the light of the second chamber Jing2-02Chu and the light of the 3rd chamber Jing2-03Chu is 17.3 °.
In the present embodiment, being coated with the FP1-02 of the high transmittance film incidence angle θ in resonator cavity described in is 0 °, in order to tuning precision is the highest.
In the present embodiment, the light path of resonator cavity is 300mm.Be coated with after the etalon FP1-02 of high transmittance film inserts resonator cavity with 0 °, regulate angle of incidence and change in the scope of 0 ° to 1 °, now, resonator cavity light path be changed to 300.315000mm to 300.315033mm.
In the present embodiment, with 1064nm light for internal oscillation wavelength, the adjustment of single longitudinal mode spacing is about 5.5 °.
In the present embodiment, as it is shown in figure 5, the resolution of band meter 4 is less than 10MHz, when band meter 4 detects the wavelength of Output of laser, it is possible to measure continuously, it is also possible to impulsive measurement.
In the present embodiment, as it is shown in figure 5, middle control computer 5 can receive the measurement result of band meter 4, and adopting certain algorithm, it is preferable that pid algorithm, output feedback signal controls electrical turntable and driver 6, to control the angle of etalon FP1-01.
In the present embodiment, electrical turntable and driver 6, it is preferable that there is milli measurement level, the resolution of even sub-milli measurement level.
To sum up embodiment it can be seen that the simple in construction of longitudinal mode drift compensation device of laser instrument, device in the embodiment of the present invention be easy to get, easy and simple to handle, applied range, common lab facilitates implementation.The chamber of resonator cavity can be continuously adjusted long, thus the output wavelength of laser instrument is carried out continuous tuning with higher resolution.For conventional iraser, the adjustment of single longitudinal mode can reach higher precision.
Based on same inventive concept, Fig. 6 is the schematic flow sheet of the longitudinal mode drift compensation method of a kind of longitudinal mode drift compensation device based on the laser instrument in any of the above-described embodiment that one embodiment of the invention provides, as shown in Figure 6, the longitudinal mode drift compensation method in the present embodiment comprises the steps:
S1: the wavelength of the Output of laser of wavelength detecting module detection resonator cavity.
S2: central control system obtains the longitudinal mode drift value of described resonator cavity according to the wavelength of described Output of laser, generates feedback signal according to described longitudinal mode drift value, and exports to controller.
S3: described controller regulates described etalon according to described feedback signal, to adjust the light path of described resonator cavity, it is achieved the compensation of the longitudinal mode drift of laser instrument.
As can be seen here, the longitudinal mode drift compensation method of the laser instrument that the present embodiment provides, the wavelength of the Output of laser of resonator cavity is detected by wavelength detecting module, central control system obtains the longitudinal mode drift value of described resonator cavity according to described Output of laser wavelength, according to described longitudinal mode drift value generation feedback signal to controller, controller regulates described etalon according to described feedback signal, to adjust the light path of described resonator cavity, it is achieved thereby that the compensation of the longitudinal mode drift of laser instrument.Thus, cost of the present invention is low, technical difficulty is low and device is simple and easy to get, solve and prior art regulates the problem that apparatus structure is complicated, cost is high, technology requirement is high, it is possible to the long-term drift of laser longitudinal mode and the noise of more than 10MHz magnitude are compensated.
Further, step S3 in above-described embodiment, specifically comprise the steps that
Described controller regulates angle or the temperature of described etalon according to described feedback signal, to adjust the light path of described resonator cavity；
The light path of described resonator cavity is:
Wherein, LoplFor the light path of described resonator cavity, L is the former length of described resonator cavity, and d is the thickness of described etalon, and n is the refractive index of described etalon, and θ is the angle of incidence for described etalon of the light in described resonator cavity, and d and n is the monotonic function of temperature.
Should be noted that, in all parts of the system of the present invention, according to its function to realize, parts therein are carried out logical partitioning, but, the present invention is not only restricted to this, it is possible to as required all parts is repartitioned or combines, for instance, can be single parts by some unit constructions, or some parts can be further broken into more subassembly.
The all parts embodiment of the present invention can realize with hardware, or realizes with the software module run on one or more processor, or realizes with their combination.It will be understood by those of skill in the art that the some or all functions that microprocessor or digital signal processor (DSP) can be used in practice to realize the some or all parts in system according to embodiments of the present invention.The present invention is also implemented as part or all the equipment for performing method as described herein or device program (such as, computer program and computer program).The program of such present invention of realization can store on a computer-readable medium, or can have the form of one or more signal.Such signal can be downloaded from internet website and obtain, or provides on carrier signal, or provides with any other form.
The present invention will be described rather than limits the invention to it should be noted above-described embodiment, and those skilled in the art can design alternative embodiment without departing from the scope of the appended claims.In the claims, any reference marks that should not will be located between bracket is configured to limitations on claims.Word " comprises " and does not exclude the presence of the element or step not arranged in the claims.Word "a" or "an" before being positioned at element does not exclude the presence of multiple such element.The present invention by means of including the hardware of some different elements and can realize by means of properly programmed computer.In the unit claim listing some devices, several in these devices can be through same hardware branch and specifically embody.Word first, second and third use do not indicate that any order.Can be title by these word explanations.
Embodiment of above is only suitable to the present invention is described; and it is not limitation of the present invention; those of ordinary skill about technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes fall within scope of the invention, and the scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. the longitudinal mode drift compensation device of a laser instrument, it is characterised in that including: etalon, wavelength detecting module, central control system and the controller being arranged in resonator cavity；
Described etalon, the light path for adjusting described resonator cavity drifts about with the longitudinal mode compensating laser instrument；
Described wavelength detecting module, for detecting the wavelength of the Output of laser of described resonator cavity；
Described central control system, is connected with described wavelength detecting module, obtains the longitudinal mode drift value of described resonator cavity for the wavelength according to described Output of laser, and generates feedback signal extremely described controller according to described longitudinal mode drift value；
Described controller, is connected with described central control system, for regulating described etalon according to described feedback signal.
2. device according to claim 1, it is characterised in that described controller includes: the electrical turntable being connected with described etalon or Piezoelectric Driving turntable, for regulating the angle of described etalon, to adjust the light path of described resonator cavity according to described feedback signal；
The light path of described resonator cavity is:
Wherein, LoplFor the light path of described resonator cavity, L is the former length of described resonator cavity, and d is the thickness of described etalon, and n is the refractive index of described etalon, and θ is the angle of incidence for described etalon of the light in described resonator cavity.
3. device according to claim 1, it is characterised in that described controller includes: temperature controlling stove, for regulating the temperature of described etalon, to adjust the light path of described resonator cavity according to described feedback signal；
The light path of described resonator cavity is:
Wherein, LoplFor the light path of described resonator cavity, L is the former length of described resonator cavity, and d is the thickness of described etalon, and n is the refractive index of described etalon, and θ is the angle of incidence for described etalon of the light in described resonator cavity, and d and n is the monotonic function of temperature.
4. device according to claim 1, it is characterised in that described etalon is: uncoated etalon, or is coated with the etalon of high transmittance film.
5. device according to claim 4, it is characterised in that when described etalon is uncoated etalon, the light in described resonator cavity is Brewster's angle for the angle of incidence of described etalon；
When described etalon is the etalon being coated with high transmittance film, the light in described resonator cavity is 0 ° for the angle of incidence of described etalon.
6. device according to claim 1, it is characterised in that described wavelength detecting module is band meter, or there is the steam bubble of fine-structure levels structure and the wavelength monitoring system of the absorption spectra of the vapor atoms comprising laser line or ion.
7. device according to claim 1, it is characterised in that described central control system, specifically for:
According to described longitudinal mode drift value, pid algorithm is adopted to generate feedback signal and export to described controller.
8. device according to claim 1, it is characterised in that described resonator cavity is standing-wave cavity or annular chamber.
9. the longitudinal mode drift compensation method based on the longitudinal mode drift compensation device of laser instrument any one of claim 1～8, it is characterised in that described method includes:
The wavelength of the Output of laser of wavelength detecting module detection resonator cavity；
Central control system obtains the longitudinal mode drift value of described resonator cavity according to the wavelength of described Output of laser, generates feedback signal according to described longitudinal mode drift value, and exports to controller；
Described controller regulates described etalon according to described feedback signal, to adjust the light path of described resonator cavity, it is achieved the compensation of the longitudinal mode drift of laser instrument.
10. method according to claim 9, it is characterised in that described controller regulates described etalon according to described feedback signal, to adjust the light path of described resonator cavity, it is achieved the compensation of the longitudinal mode drift of laser instrument, including:
Described controller regulates angle or the temperature of described etalon according to described feedback signal, to adjust the light path of described resonator cavity；
The light path of described resonator cavity is:
Wherein, LoplFor the light path of described resonator cavity, L is the former length of described resonator cavity, and d is the thickness of described etalon, and n is the refractive index of described etalon, and θ is the angle of incidence for described etalon of the light in described resonator cavity, and d and n is the monotonic function of temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610236778.1A CN105762628A (en) | 2016-04-15 | 2016-04-15 | Longitudinal mode drift compensation device and method for laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610236778.1A CN105762628A (en) | 2016-04-15 | 2016-04-15 | Longitudinal mode drift compensation device and method for laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105762628A true CN105762628A (en) | 2016-07-13 |
Family
ID=56335215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610236778.1A Pending CN105762628A (en) | 2016-04-15 | 2016-04-15 | Longitudinal mode drift compensation device and method for laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105762628A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4533247A (en) * | 1981-09-03 | 1985-08-06 | International Standard Electric Corporation | Optical transmission system |
| CN1258946A (en) * | 1998-12-28 | 2000-07-05 | 中国科学院长春光学精密机械研究所 | Laser resonator trimming mechanism with optical path compensation |
| CN1554139A (en) * | 2000-10-10 | 2004-12-08 | 光谱传感器公司 | Method and system for locking transmission wavelengths for lasers in a dense wavelength division multiplexer utilizing a tunable etalon |
| CN101896849A (en) * | 2007-12-20 | 2010-11-24 | 瑞尼斯豪公司 | External cavity tunable laser with an air gap etalon comprising wedges |
| CN102944931A (en) * | 2012-11-19 | 2013-02-27 | 中国电子科技集团公司第十一研究所 | Precise compensator for optical path |
-
2016
- 2016-04-15 CN CN201610236778.1A patent/CN105762628A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4533247A (en) * | 1981-09-03 | 1985-08-06 | International Standard Electric Corporation | Optical transmission system |
| CN1258946A (en) * | 1998-12-28 | 2000-07-05 | 中国科学院长春光学精密机械研究所 | Laser resonator trimming mechanism with optical path compensation |
| CN1554139A (en) * | 2000-10-10 | 2004-12-08 | 光谱传感器公司 | Method and system for locking transmission wavelengths for lasers in a dense wavelength division multiplexer utilizing a tunable etalon |
| CN101896849A (en) * | 2007-12-20 | 2010-11-24 | 瑞尼斯豪公司 | External cavity tunable laser with an air gap etalon comprising wedges |
| CN102944931A (en) * | 2012-11-19 | 2013-02-27 | 中国电子科技集团公司第十一研究所 | Precise compensator for optical path |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6845108B1 (en) | Tuning of laser wavelength in actively mode-locked lasers | |
| CN111129947B (en) | Laser frequency stabilizing device and method and semiconductor laser assembly adopting same | |
| US7813390B2 (en) | Injection-seeded monolithic laser | |
| JP6290077B2 (en) | Compact optical frequency comb system | |
| US7835411B2 (en) | Laser frequency stabilizing device, method and program | |
| US9350368B2 (en) | Atomic cell, atomic resonance transition device, atomic oscillator, electronic apparatus, and moving object | |
| CN100492786C (en) | Passive Q-switched laser equipment | |
| WO2016041218A1 (en) | External cavity tunable laser and cavity mode locking method thereof | |
| EP3297104B1 (en) | Method of angular beam adjustment in tunable laser systems | |
| US11215654B2 (en) | Measuring device, measuring system, and measuring method for liquid crystal dielectric constant | |
| CN102005693B (en) | Laser frequency stabilizing method and device for precision metrology | |
| US10756743B2 (en) | Atomic oscillator and electronic device | |
| US10534205B2 (en) | Apparatus and method for generating electromagnetic radiation | |
| JP6637899B2 (en) | Method of operating a laser device, use of a resonator and a phase shifter | |
| CN101388521B (en) | Method for realizing adjustment of laser frequency difference and laser thereof | |
| CN105244744A (en) | Optical comb system for implementing wideband carrier enveloped offset frequency control with electro-optic crystal | |
| CN106911069A (en) | A kind of chamber adjustable optical fiber femtosecond laser long | |
| CN104242044A (en) | Electro-optical double-refraction double-cavity double-frequency Nd:YAG laser device and frequency difference tuning method | |
| Kasapi et al. | Pulsed Ti: sapphire laser seeded off the gain peak | |
| CN110289542B (en) | 2 mu m high-repetition-frequency injection frequency-locked laser based on pyramid annular cavity | |
| WO2019200886A1 (en) | Method for realizing synchronous tuning of wavelength and repetition frequency in passive mode-locking laser | |
| TW201947207A (en) | Characterizing an optical element | |
| US20090285248A1 (en) | Uv light generation by frequency conversion of radiation of a ruby laser pumped with a second harmonic of a solid-state laser | |
| CN107425409A (en) | Mode-locked laser and optical system | |
| CN105762628A (en) | Longitudinal mode drift compensation device and method for laser |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160713 |