CN102545026A - System and method capable of realizing energy stability of injected laser - Google Patents
System and method capable of realizing energy stability of injected laser Download PDFInfo
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- CN102545026A CN102545026A CN2011100853960A CN201110085396A CN102545026A CN 102545026 A CN102545026 A CN 102545026A CN 2011100853960 A CN2011100853960 A CN 2011100853960A CN 201110085396 A CN201110085396 A CN 201110085396A CN 102545026 A CN102545026 A CN 102545026A
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Abstract
The invention relates to a system and a method capable of realizing energy stability of injected laser. The system is connected with an external injection fiber and comprises a first light split unit, a Lambda/2 wave plate, a second light split unit, an energy monitoring device, a delay device, an optical rotation device, a third light split unit and an electric control device, wherein the input light from the injection fiber is changed to a first horizontal polarized light by the first light split unit, is rotated at a preset angle Theta by the Lambda/2 wave plate and is then split into a first polarized light and a second polarized light by the second light split unit, the first polarized light enters the energy monitoring device, the delay device receives and transmits the second polarized light in a delayed manner, the electric control device receives the energy E monitoring of the first polarized light and generates an optical rotation angle Beta according to the energy E monitoring, and the optical rotation device carries out optical rotation according to the angle Beta; and the third light split unit receives the second polarized light after optical rotation and outputs a second horizontal polarized light. According to the system and the method, the stability of pulse laser outputted by the system along with the time change is ensured, and the stable gain of the laser pulse is further realized.
Description
Technical field
The present invention relates to the laser application technique field, particularly a kind of electrooptic crystal that utilizes realizes injecting the stable system and method for laser energy.
Background technology
Electrooptical switching is a very important device in the laser; Its application is an important breakthrough on the laser development history; It makes the monochromatic brightness of laser improve several orders of magnitude, has also promoted the development of application technologies such as laser ranging, laser radar, high speed holographic and laser processing simultaneously.Its principle is to utilize the effect of external electric field to make the change of the refractive index generating period property of crystal: uniaxial crystal periodically becomes biaxial crystal under effect of electric field; Or the change of the shape of the index ellipsoid of biaxial crystal and orientation generating period property; Electrooptical switching makes the light generation birefringence through crystal change the polarization polarization state of light, uses the modulation that just can realize light with polarizer.The electrooptical switching technology is through in the oscillatory process of laser, changing the Q value of resonant cavity, to produce the laser of high-peak power, narrow pulse width.Compare with acoustooptic switch, electrooptical switching is widely used in solid state laser because of having efficient height, fast, the narrow and peak power advantages of higher of output laser pulse width of switching speed.
The pulse laser that the laser front end injects, energy are unstable, as shown in Figure 1 usually.The laser energy of laser output can fluctuate up and down along with the instability of the laser energy that injects; The unsettled laser of laser energy is through behind some Optical Maser Systems; This unsteadiness in addition can be exaggerated a lot of doubly, and make the unsteadiness of the laser energy of laser output become unusual violent.
Summary of the invention
Main contents of the present invention are to provide a kind of stable system and method for laser energy of realizing injecting, and are intended to improve the stability of laser output laser energy.
In order to achieve the above object, the present invention proposes a kind of stable system of laser energy that realizes injecting, and is connected with outside injection fibre, and said system comprises:
First spectrophotometric unit is used to receive the input light of said outside injection fibre, and said input light is become the first horizontal linear polarization light;
λ/2 wave plates is used to receive the said first horizontal linear polarization light, and with said first horizontal linear polarization light rotation predetermined angle theta;
Second spectrophotometric unit is used to receive the postrotational first horizontal linear polarization light, and is divided into first polarised light and second polarised light is exported;
The energy monitoring device is used to receive said first polarised light, and the energy E of keeping watch on first polarised light
Prison
Deferred mount is used for receiving and postpones to transmit said second polarised light;
Electric control gear is used to receive the energy E of said first polarised light
Prison, and according to the energy E of said first polarised light
PrisonProduce the optically-active angle beta;
The optically-active device is used to receive said second polarised light, and carries out optically-active according to said angle beta; And
The 3rd spectrophotometric unit is used to receive second polarised light after the optically-active, and exports the second horizontal linear polarization light.
Preferably, said predetermined angle theta is meant incident vibration plane and the angle between the optical axis of the input light of said λ/2 wave plates, wherein, and 0≤θ≤90.
Preferably, said first spectrophotometric unit, second spectrophotometric unit and the 3rd spectrophotometric unit are polarization splitting prism.
Preferably, said optically-active device is an electrooptical switching.
Preferably, said first polarised light and said second polarised light are respectively perpendicular linear polarization light and the 3rd horizontal linear polarization light.
Preferably, said electric control gear also is used for suspending earlier said optically-active device, and according to the energy E of said first polarised light
Prison, the least energy E of the 3rd horizontal linear polarization light of said deferred mount output in the calculating scheduled time Δ t
Min, open said optically-active device, according to said least energy E
MinObtain the voltage V that is added on the said optically-active device, make the energy of the said second horizontal linear polarization light of said the 3rd spectrophotometric unit output keep least energy E in the Δ t at the fixed time
Min
Preferably, E
Min=E
Prison min/ tg
22 θ; Wherein,
E
Prison minThe energy E of the perpendicular linear polarization light that measures for scheduled time Δ t self-energy monitoring arrangement
PrisonMinimum value.
Preferably, the said voltage V=F (β) that is added on the optically-active device, wherein,
The present invention also proposes a kind of stable method of laser energy that realizes injecting, and may further comprise the steps:
First spectrophotometric unit receives the input light that outside injection fibre injects through coupling head, and said input light is become the first horizontal linear polarization light, exports λ/2 wave plates to;
Said λ/2 wave plates export the horizontal linear polarization light rotation predetermined angle theta that receives to second spectrophotometric unit;
Said second spectrophotometric unit is isolated first polarised light and second polarised light from the linearly polarized light that receives, and the said first polarised light branch is delivered to the energy monitoring device, and the said second polarised light branch is delivered to deferred mount;
The energy monitoring device receives said first polarised light, and the energy E of keeping watch on first polarised light
Prison
Deferred mount receives and delay transmits said second polarised light;
Electric control gear receives the energy E of said first polarised light
Prison, and according to the energy E of said first polarised light
PrisonProduce the optically-active angle beta;
The optically-active device receives said second polarised light, and carries out optically-active according to said angle beta;
The 3rd spectrophotometric unit receives second polarised light after the optically-active, and exports the second horizontal linear polarization light.
Preferably, said predetermined angle theta is meant incident vibration plane and the angle between the optical axis of the input light of said λ/2 wave plates, wherein, and 0≤θ≤90.
Preferably, said first spectrophotometric unit, second spectrophotometric unit and the 3rd spectrophotometric unit are polarization splitting prism.
Preferably, said optically-active device is an electrooptical switching.
Preferably, said first polarised light and said second polarised light are respectively perpendicular linear polarization light and the 3rd horizontal linear polarization light.
Preferably, the step that produces said optically-active angle beta comprises:
Said electric control gear is according to the measurement result E of said energy monitoring device
Prison, the least energy E of the 3rd horizontal linear polarization light of said deferred mount output in the calculating scheduled time Δ t
MinAnd
Said electric control gear is according to said least energy E
MinObtain the voltage V that is added on the said optically-active device, make the energy of the second horizontal linear polarization light of said the 3rd spectrophotometric unit output keep least energy E in the Δ t at the fixed time
Min
Preferably, E
Min=E
Prison min/ tg
22 θ; Wherein,
E
Prison minThe energy E of the perpendicular linear polarization light that measures for scheduled time Δ t self-energy monitoring arrangement
PrisonMinimum value.
Preferably, the said voltage V=F (β) that is added on the optically-active device, wherein,
The present invention proposes a kind ofly realizes injecting the stable system and method for laser energy; Measurement through the energy monitoring device and electric control gear are to the control of optically-active device; Obtain the least energy Emin that passes through the horizontal linear polarization light of deferred mount in the scheduled time Δ t, with this least energy Em
InBe standard, and by electric control gear control, adjustment is added in the voltage on the optically-active device, makes the energy of the horizontal linear polarization light of exporting through optically-active device and warp the 3rd spectrophotometric unit remain on least energy E
MinThereby, guaranteed the time dependent stability of exporting of pulse laser, further realize the constant gain of laser pulse.
In order to make technical scheme of the present invention clearer, clear, will combine accompanying drawing to do further to detail below.
Description of drawings
Fig. 1 is that existing laser injects the laser energy time history plot;
Fig. 2 is that the present invention realizes injecting the stable system of laser energy one example structure sketch map;
Fig. 3 is the incident vibration plane of the present invention's input light of realizing injecting the one embodiment λ of the stable system of laser energy/2 wave plates and the angle structural representation between the optical axis;
Fig. 4 is that the present invention realizes injecting a kind of execution mode structural representation of one embodiment of the stable system of laser energy;
Fig. 5 is that the present invention realizes injecting the amplitude decomposing schematic representation of one embodiment of the stable system of laser energy through the linearly polarized light behind the electrooptic crystal;
Fig. 6 is that the present invention realizes injecting one embodiment of the stable system of laser energy and injects laser energy and keep stable sketch map in time;
Fig. 7 is that the present invention realizes injecting the stable method of laser energy one embodiment schematic flow sheet;
Fig. 8 is that the present invention realizes injecting the schematic flow sheet that the stable method of laser energy one embodiment produces the optically-active angle beta.
Embodiment
As shown in Figure 2; One embodiment of the invention proposes a kind of stable system of laser energy that realizes injecting; Be connected with outside injection fibre 1; This system comprises: first spectrophotometric unit 3, λ/2 wave plate 4, second spectrophotometric unit 5, deferred mount 6, energy monitoring device 9, optically-active device 7, the 3rd spectrophotometric unit 8 and be connected the electric control gear 10 that is used to control optically-active device 7 with optically-active device 7, wherein:
First spectrophotometric unit 3 is used to receive the input light of outside injection fibre, and will import light and become the first horizontal linear polarization light.
λ/2 wave plates 4 is used to receive the first horizontal linear polarization light, and with first horizontal linear polarization light rotation predetermined angle theta.
Second spectrophotometric unit 5 is used to receive the postrotational first horizontal linear polarization light, and is divided into first polarised light and second polarised light is exported.
Deferred mount 6 is used for receiving and postpones to transmit second polarised light.
Optically-active device 7 is used to receive second polarised light, and carries out optically-active according to angle beta.
The 3rd spectrophotometric unit 8 is used to receive second polarised light after the optically-active, and exports the second horizontal linear polarization light.
In the present embodiment, first spectrophotometric unit 3 is connected through coupling head 2 with outside injection fibre 1; Second spectrophotometric unit, 5 one outputs are connected with deferred mount 6, and its another output is connected with energy monitoring device 9; λ/2 wave plates 4 are connected between first spectrophotometric unit 3 and second spectrophotometric unit 5.
Particularly, first spectrophotometric unit 3, second spectrophotometric unit 5 and the 3rd spectrophotometric unit 8 are PBS (polarization splitting prism) in the present embodiment.
As shown in Figure 3, the incident vibration plane and the angle between the optical axis of the input light of λ/2 wave plates 4 are θ, 0≤θ≤90.
Wave plate; Be called phase delay chip again; It makes the amount of polarization through two mutually orthogonals of wave plate produce phase deviation, can be used to adjust the polarization state of light beam, and the major parameter of wave plate comprises wavelength, phase place, bore and wave plate type (zero level or multistage); Common wave plate is made by quartz crystal, be mainly 1/2nd with quarter-wave plate be λ/2 wave plates and λ/4 wave plates.
Linearly polarized light still is a linearly polarized light, still through behind λ/2 wave plates; It closes the vibration plane of vibration and the vibration plane of incident ray polarized light turns over 2 θ; If θ=45 degree, then the vibration plane of emergent light is vertical with the vibration plane of former incident light, that is to say; When θ=45 were spent, λ/2 wave plates can make polarization state revolve and turn 90 degrees.
When the angle theta of the incident vibration plane of polarised light and wave plate optical axis is 45 when spending, the light through λ/4 wave plates is circularly polarized light, otherwise, when circularly polarized light through behind λ/4 wave plates, then become linearly polarized light.When twice of light during through λ/4 wave plates, effect is equivalent to a λ/2 wave plates.λ/4 wave plates can also be used with PBS, realize the effect of optical isolator.
Above-mentioned optically-active device 7 can be electrooptical switching.In this execution mode, electric control gear 10 gives the added voltage of electrooptic crystal in the electrooptical switching different, and its character that shows is also different.For example, add λ/2 voltages, electrooptic crystal shows the character of λ/2 wave plates; Add λ/4 voltage electrooptic crystals and show the character of λ/4 wave plates, add the voltage of the λ of how many branches, electrooptic crystal just shows the character of wave plate of the λ of how many branches, realizes the bit phase delay of o light and e light, thereby changes the energy of light.
As shown in Figure 4, be that electrooptical switching, first spectrophotometric unit 3 are that PBS1, second spectrophotometric unit 5 are that PBS2, second light-dividing device 8 are that PBS3 is an example with optically-active device 7 below and combine Fig. 2 and Fig. 3 sets forth the operation principle that present embodiment realize to inject the stable system of laser energy in detail:
Inject light and pulse laser is injected the PBS1 of present embodiment system through coupling head 2; PBS1 becomes laser into the first horizontal linear polarization light; The first horizontal linear polarization light is through behind λ/2 wave plates 4; According to linear polarization rotation minute angle θ as shown in Figure 3, dotted line is represented the direction of vibration before the first horizontal linear polarization light passes through λ/2 wave plates 4 among Fig. 3, and solid line representes that the first horizontal linear polarization light is through the direction of vibration behind λ/2 wave plates 4.
Behind the postrotational first horizontal linear polarization light process of λ/2 wave plates PBS2; The perpendicular linear polarization light that sub-fraction laser is promptly separated from the first horizontal linear polarization light gets into energy monitoring device 9; The 3rd horizontal linear polarization light that most of laser is promptly separated from the first horizontal linear polarization light is propagated through deferred mount 6 continued backward; Through electrooptical switching, pass through PBS3 at last after, the energy stabilization of the second horizontal linear polarization light of output.
The energy stabilization of the second horizontal linear polarization light of PBS3 output is that the control through 10 pairs of electrooptical switchinges of electric control gear realizes.
At first need obtain the least energy Emin of deferred mount 6 outputs in the Δ t at the fixed time through the measurement result of energy monitoring device 9; Be standard with this least energy Emin then; Calculate in the scheduled time Δ t certain constantly t should be added in the magnitude of voltage V on the electrooptical switching so that the second horizontal linear polarization light of PBS3 output at the fixed time the energy in the Δ t preserve stationary value Emin.
Wherein: Emin=E
Prison min/ tg
22 θ, in the formula, E
Prison minThe energy E of the perpendicular linear polarization light that measures for scheduled time Δ t self-energy monitoring arrangement 9
PrisonMinimum value, with the standard energy value of Emin as present embodiment system stability output laser.
V=F (β); Wherein,
β is through the vibration plane of the linearly polarized light behind the electrooptical switching and the angle of optical axis.
The computational process of β is following:
If the energy of the linearly polarized light through deferred mount 6 is E
Prolong, then have
E
Prolong=E
Prison/ tg
22 θ, (1)
As shown in Figure 5, through the amplitude A of the linearly polarized light of electrooptic crystal in the deferred mount 6 back entering electrooptical switchinges
ProlongCan be decomposed into horizontal direction and vertical direction,
A
ProlongCos β=A
Level(2)
Thus, can obtain
E
ProlongCos
2β=E
Level(3)
The energy stabilization of preserving the horizontal linear polarization light of PBS3 output is Emin, then makes E in above-mentioned (3) formula
Level=Emin
Then,
E
ProlongCos
2β=Emin (4)
Obtain according to above-mentioned (1) and (4) formula
Last according to the functional relation V=F (β) that is scheduled to that is added in voltage and β on the electrooptic crystal; Interior certain moment t of scheduled time Δ t can be obtained and the magnitude of voltage V on the electrooptic crystal in the electrooptical switching should be added in, Emin thereby the energy of the second horizontal linear polarization light of assurance PBS3 output remains stable.
Acting as of deferred mount 6 wherein: 9 monitorings of energy monitoring device are analyzed the laser energy in the Δ t time, carry out handled by electric control gear 10 again, make deferred mount 6 need laser be postponed Δ t.
Through the linearly polarized light after the present embodiment system handles because its energy Emin that remains stable; Therefore, it is highly stable that pulse laser to be injected is changed in time, as shown in Figure 6; The pulse laser that this is stable reinjects in the laser amplifier, can realize the constant gain of laser pulse.
As shown in Figure 7, one embodiment of the invention proposes a kind of stable method of system's realization injection laser energy in the foregoing description of utilizing, and comprising:
Step S101, first spectrophotometric unit receive the input light that outside injection fibre injects through coupling head, and will import light and become horizontal linear polarization light, export λ/2 wave plates to;
Step S102, λ/2 wave plates export the horizontal linear polarization light rotation predetermined angle theta that receives to second spectrophotometric unit;
Step S103, second spectrophotometric unit is isolated first polarised light and second polarised light from the linearly polarized light that receives, and the first polarised light branch is delivered to the energy monitoring device, and the second polarised light branch is delivered to deferred mount;
Step S104, the energy monitoring device receives first polarised light, and keeps watch on the energy E of first polarised light
Prison
Step S105, deferred mount receive and delay transmits second polarised light;
Step S106, electric control gear receive the energy E of first polarised light
Prison, and according to the energy E of first polarised light
PrisonProduce the optically-active angle beta;
Step S107, the optically-active device receives second polarised light, and carries out optically-active according to angle beta;
Step S108, the 3rd spectrophotometric unit receives second polarised light after the optically-active, and exports the second horizontal linear polarization light.
Above-mentioned predetermined angle theta is meant incident vibration plane and the angle between the optical axis of the input light of λ/2 wave plates, wherein, and 0≤θ≤90.
First spectrophotometric unit, second spectrophotometric unit and the 3rd spectrophotometric unit are polarization splitting prism in the present embodiment.
Above-mentioned first polarised light and second polarised light are respectively perpendicular linear polarization light and the 3rd horizontal linear polarization light.
As shown in Figure 8, the step that produces the optically-active angle beta among the step S106 comprises:
Step S1061, electric control gear is according to the measurement result E of energy monitoring device
Prison, the least energy E of the 3rd horizontal linear polarization light of deferred mount output in the calculating scheduled time Δ t
Min
Step S1062, electric control gear is according to least energy E
MinObtain the voltage V that is added on the optically-active device, make the energy of the second horizontal linear polarization light of the 3rd spectrophotometric unit output keep least energy E in the Δ t at the fixed time
Min
Above-mentioned E
Min=E
Prison min/ tg
22 θ; Wherein, E
Prison minThe energy E of the perpendicular linear polarization light that measures for scheduled time Δ t self-energy monitoring arrangement
PrisonMinimum value.
Above-mentionedly be added in the voltage V=F (β) on the electrooptic crystal in the optically-active device, wherein,
In the present embodiment, the optically-active device can be electrooptical switching.In this execution mode, electric control gear gives the added voltage of the electrooptic crystal in the electrooptical switching different, and the character that electrooptic crystal showed is also different.The voltage that adds the λ of how many branches, electrooptic crystal just show the character of wave plate of the λ of how many branches, realize the bit phase delay of o light and e light, thereby change the energy of light.
The embodiment of the invention proposes a kind ofly realizes injecting the stable system and method for laser energy; Measurement through the energy monitoring device and electric control gear be to the control of optically-active device, obtains in the scheduled time Δ t least energy E through the horizontal linear polarization light of deferred mount
Min, with this least energy E
MinBe standard, and by electric control gear control, adjustment is added in the voltage on the electrooptic crystal in the optically-active device, makes the energy of the horizontal linear polarization light of exporting through optically-active device and warp second light-dividing device remain on least energy E
MinThereby, guaranteed the time dependent stability of exporting of pulse laser, further realize the constant gain of laser pulse.
The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure or flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical field, all in like manner be included in the scope of patent protection of the present invention.
Claims (16)
1. realize injecting the stable system of laser energy for one kind, be connected, it is characterized in that said system comprises with outside injection fibre:
First spectrophotometric unit is used to receive the input light of said outside injection fibre, and said input light is become the first horizontal linear polarization light;
λ/2 wave plates is used to receive the said first horizontal linear polarization light, and with said first horizontal linear polarization light rotation predetermined angle theta;
Second spectrophotometric unit is used to receive the postrotational first horizontal linear polarization light, and is divided into first polarised light and second polarised light is exported;
The energy monitoring device is used to receive said first polarised light, and the energy E of keeping watch on first polarised light
Prison
Deferred mount is used for receiving and postpones to transmit said second polarised light;
Electric control gear is used to receive the energy E of said first polarised light
Prison, and according to the energy E of said first polarised light
PrisonProduce the optically-active angle beta;
The optically-active device is used to receive said second polarised light, and carries out optically-active according to said angle beta; And
The 3rd spectrophotometric unit is used to receive second polarised light after the optically-active, and exports the second horizontal linear polarization light.
2. system according to claim 1 is characterized in that, said predetermined angle theta is meant incident vibration plane and the angle between the optical axis of the input light of said λ/2 wave plates, wherein, and 0≤θ≤90.
3. system according to claim 2 is characterized in that, said first spectrophotometric unit, second spectrophotometric unit and the 3rd spectrophotometric unit are polarization splitting prism.
4. system according to claim 3 is characterized in that, said optically-active device is an electrooptical switching.
5. system according to claim 4 is characterized in that, said first polarised light and said second polarised light are respectively perpendicular linear polarization light and the 3rd horizontal linear polarization light.
6. system according to claim 5 is characterized in that, said electric control gear also is used for suspending earlier said optically-active device, and according to the energy E of said first polarised light
Prison, the least energy E of the 3rd horizontal linear polarization light of said deferred mount output in the calculating scheduled time Δ t
Min, open said optically-active device, according to said least energy E
MinObtain the voltage V that is added on the said optically-active device, make the energy of the said second horizontal linear polarization light of said the 3rd spectrophotometric unit output keep least energy E in the Δ t at the fixed time
Min
7. system according to claim 6 is characterized in that E
Min=E
Prison min/ tg
22 θ; Wherein,
E
Prison minThe energy E of the perpendicular linear polarization light that measures for scheduled time Δ t self-energy monitoring arrangement
PrisonMinimum value.
8. system according to claim 7; It is characterized in that; The said voltage V=F (β) that is added on the optically-active device; Wherein,
9. realize injecting the stable method of laser energy for one kind, it is characterized in that, may further comprise the steps:
First spectrophotometric unit receives the input light that outside injection fibre injects through coupling head, and said input light is become the first horizontal linear polarization light, exports λ/2 wave plates to;
Said λ/2 wave plates export the horizontal linear polarization light rotation predetermined angle theta that receives to second spectrophotometric unit;
Said second spectrophotometric unit is isolated first polarised light and second polarised light from the linearly polarized light that receives, and the said first polarised light branch is delivered to the energy monitoring device, and the said second polarised light branch is delivered to deferred mount;
The energy monitoring device receives said first polarised light, and the energy E of keeping watch on first polarised light
Prison
Deferred mount receives and delay transmits said second polarised light;
Electric control gear receives the energy E of said first polarised light
Prison, and according to the energy E of said first polarised light
PrisonProduce the optically-active angle beta;
The optically-active device receives said second polarised light, and carries out optically-active according to said angle beta;
The 3rd spectrophotometric unit receives second polarised light after the optically-active, and exports the second horizontal linear polarization light.
10. method according to claim 9 is characterized in that, said predetermined angle theta is meant incident vibration plane and the angle between the optical axis of the input light of said λ/2 wave plates, wherein, and 0≤θ≤90.
11. method according to claim 10 is characterized in that, said first spectrophotometric unit, second spectrophotometric unit and the 3rd spectrophotometric unit are polarization splitting prism.
12. method according to claim 11 is characterized in that, said optically-active device comprise following one of at least: electrooptical switching, Faraday polarization apparatus, liquid crystal, have λ/2 wave plates of circulator.
13. method according to claim 12 is characterized in that, said first polarised light and said second polarised light are respectively perpendicular linear polarization light and the 3rd horizontal linear polarization light.
14. method according to claim 12 is characterized in that, the step that produces said optically-active angle beta comprises:
Said electric control gear is according to the measurement result E of said energy monitoring device
Prison, the least energy E of the 3rd horizontal linear polarization light of said deferred mount output in the calculating scheduled time Δ t
MinAnd
Said electric control gear is according to said least energy E
MinObtain the voltage V that is added on the said optically-active device, make the energy of the second horizontal linear polarization light of said the 3rd spectrophotometric unit output keep least energy E in the Δ t at the fixed time
Min
15. method according to claim 14 is characterized in that, E
Min=E
Prison min/ tg
22 θ; Wherein,
E
Prison minThe energy E of the perpendicular linear polarization light that arrives for said energy monitoring measurement device in the scheduled time Δ t
PrisonMinimum value.
16. method according to claim 15; It is characterized in that; The said voltage V=F (β) that is added on the optically-active device; Wherein,
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