CN103245341B - Laser gyro - Google Patents
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- CN103245341B CN103245341B CN201210022644.1A CN201210022644A CN103245341B CN 103245341 B CN103245341 B CN 103245341B CN 201210022644 A CN201210022644 A CN 201210022644A CN 103245341 B CN103245341 B CN 103245341B
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Abstract
The present invention discloses a kind of laser gyro, wherein the first light beam is sent to the first side surface of gyroscope cavity by polarization splitting prism, and between the 3rd side surface, form the first light path be rotated counterclockwise at the first side surface of gyroscope cavity, from the first input end of the first transmitted light beam arrival beat frequency measurement mechanism that the first side surface transmits.Second light beam is sent to the 4th side surface of gyroscope cavity by polarization splitting prism, and between the 6th side surface, form the second light path turned clockwise at the 4th side surface of gyroscope cavity, from the second input end of the second transmitted light beam arrival beat frequency measurement mechanism that the 4th side surface transmits, beat frequency measurement mechanism utilizes the first transmitted light beam and the second transmitted light beam to carry out beat frequency process.Wherein the first light path and the second light path not overlapping.Because the beam path turned clockwise in gyroscope cavity is not overlapping with the beam path be rotated counterclockwise, thus avoid latch up effect, improve the precision of laser gyro.
Description
Technical field
The present invention relates to laser technology, especially relate to laser gyro.
Background technology
Since the sixties in last century, laser gyro has played great function in national defence and civil area, and it is the high precision inertia sensing instrument uniquely really obtaining the non-electromechanical of practical application up to now in field of inertia technology.Compared to conventional electromechanical gyro, laser gyro has the features such as reliability is high, the life-span long, precision high cost is low.At present, countries in the world air force is all used for laser gyro the standard device of location navigation as air force's system, and various big-and-middle-sized airline carriers of passengers is also all equipped with laser gyro inertial reference system, and laser equipment has started to develop on naval vessel and land-bound equipment simultaneously.
Current laser gyro is all for ultimate principle with Sagnac (Sagnac) effect, namely in the ring cavity of random geometry, from when getting back to this after a pair laser beam of a certain observation point runs one week in opposite direction, now this is directly proportional to the slewing rate of the phase differential of light beam or light path extent and closed light path.Laser gyro is rotated along clockwise (CW) direction in ring cavity by measuring laser beam determines its angular velocity of rotation with along difference on the frequency when (CCW) direction rotates counterclockwise.Concrete formula is:
Wherein Δ f represents the frequency difference measured, the area that A surrounds for ring cavity, and λ is the wavelength of laser, P for the girth of ring cavity institute enclosing region, Ω be the angular velocity of rotation of ring cavity.
Formula (2) can be obtained by carrying out distortion to above-mentioned formula (1), namely obtaining the expression formula of angular velocity measurement sensitivity.
Wherein δ f is the difference between the frequency that rotates in the clockwise direction respectively of laser and the frequency rotated in the counterclockwise direction.Can learn from formula (2), angular velocity measurement sensitivity be improved, the ring cavity comprising large regions as far as possible, optical maser wavelength short as far as possible should be used, and laser linewidth narrow as far as possible.
Fig. 1 is the schematic diagram of laser gyro.In FIG, the laser beam that laser instrument 101 exports is by entering polarization splitting prism (Polarizing BeamSplitter after isolator 102, half-wave plate 103, be called for short: PBS) laser beam is divided into folded light beam and transmitted light beam by 104, PBS 104.Wherein folded light beam is divided into reflecting part and transmissive portion by Amici prism 105, reflecting part enters Amici prism 120 and measures for beat frequency, transmissive portion enters electrooptic modulator 106, the local oscillation signal that electrooptic modulator 106 utilizes signal source 107 to provide is modulated transmissive portion, and the laser signal after modulation is totally reflected by completely reflecting mirror M1, and also rotated in the counterclockwise direction by completely reflecting mirror M5 freedom of entry space ring cavity 122, the transmitted light of the laser signal rotated in the counterclockwise direction goes out to inject photodetector 108 from M5, laser signal is converted to electric signal by photodetector 108, control the piezoelectric ceramics 111 on free space ring cavity 122 through servo-drive system 110 after the electric signal that photodetector 108 is changed by frequency mixer 109 and the local oscillation signal mixing that signal source 107 produces.Simultaneously the transmitted light beam that provides of PBS 104 is after acousto-optic modulator 112,113, is totally reflected respectively via completely reflecting mirror M2 and M3.The laser beam that completely reflecting mirror M2 is totally reflected by Amici prism 120 and the reflecting part provided by Amici prism 105 are supplied to photoelectric detector 121 to carry out beat frequency measurement after carrying out conjunction bundle, and the local oscillation signal that electrooptic modulator 114 utilizes signal source 115 to produce is modulated the laser signal that completely reflecting mirror M3 is totally reflected.Laser signal after modulation is totally reflected by completely reflecting mirror M4 by electrooptic modulator 114, and be rotated in a clockwise direction by completely reflecting mirror M6 freedom of entry space ring cavity 122, the transmitted light of the laser signal be rotated in a clockwise direction enters photodetector 116 from M6, laser signal is converted to electric signal by photodetector 116, control the output frequency of voltage controlled oscillator 119 through servo-drive system 118 after the electric signal that photodetector 116 provides by frequency mixer 117 and the local oscillation signal mixing that signal source 115 produces, and the output frequency of voltage controlled oscillator 119 is supplied to acousto-optic modulator 112.Be rotated in a clockwise direction respectively in ring cavity and difference on the frequency when rotating in the counterclockwise direction by measuring laser beam, the angular velocity of rotation of laser gyro can be determined.
In this schematic diagram, what gyroscope cavity adopted is free space ring cavity, and those skilled in the art are scrutable, and gyroscope cavity also can adopt optic fiber ring-shaped cavity.
Current laser gyro mainly adopts triangle resonator cavity and mechanical shaking Frequency-Biasing Technique, namely in the cavity be made up of metallic-membrane plating reflector, adopts the direct control chamber length of piezoelectric element to carry out frequency stabilization.Find out from formula (1), the input-output characteristic curve of desirable laser gyro should be strict logical zeroaxial straight line.But laser gyro essence is introduced gain source and formed in annular Sagnac interferometer, the introducing in gain source also brings many error sources simultaneously.Main error has zero partially (in fact zero partially itself with certain randomness, i.e. drift), locking and errors of proportional factor, wherein limit the most serious error of laser gyro practical application, no more than the lock district error caused by latch up effect, namely when input angular velocity low to a certain extent time, positive and negative two bundle laser frequencies are identical, export, only have when input rate is greater than lock-in threshold Ω without beat signal
ltime just have beat frequency to export.
The essence of latch up effect is because positive and negative two bundle row ripples are coupled mutually, produces the result of Frequency Synchronization.Cause a lot of because have of coupling, as the non-linear absorption etc. of gain media in the scattering of the incomplete reflection of laser mirror, mirror surface, resonator cavity.Wherein topmost factor is the backscattering of catoptron.In the ring resonator of laser gyro, realize light beam with catoptron to detour in the loop, because catoptron can not be accomplished to reflect completely, when light beam reflects along light path by catoptron, total existence is to all directions scattering, and participate in reciprocal light beam along the scattered light (back-scattering light) that input path returns, thus create coupling, obtain energy to interpenetrate, when the frequency difference of positive and negative two bundle row ripples little to a certain extent time, this two bundles row wave frequency will be synchronous, thus cause laser gyro no signal to export.
Since laser gyro occurs, latch up effect annoyings the application and development of laser gyro always.The method that current laser gyro overcomes latch up effect mainly adopts the method for active resonant cavity, Frequency-Biasing Technique is used to reduce lock district to the impact of laser gyro, develop multiple Frequency-Biasing Technique at present, as methods such as Dithered, rate biased, magnetic mirror bias, Zeeman offset frequency, mirror jitter offset frequency, four-frequency differentials.These methods are inherently in laser gyro ring cavity, add a disturbance, make laser frequency Rapid Variable Design within the scope of, the lock district threshold value of laser gyro is constantly changed, avoid laser gyro generation locking, but this method does not inherently eliminate latch-up phenomenon.The working mechanism simultaneously adding frequency disturbance is varied, brings the error of measuring accuracy.And the introducing of Frequency-Biasing Technique causes laser gyro to take measurement of an angle certain restriction, to a certain extent little when taking measurement of an angle, the error that offset frequency is brought can be greater than the beat frequency result that takes measurement of an angle, and cause the measurement result of laser gyro unreliable, this also directly limit the precision of laser gyro.
Summary of the invention
The technical problem to be solved in the present invention is to provide laser gyro, because the beam path turned clockwise in gyroscope cavity is not overlapping with the beam path be rotated counterclockwise, thus effectively prevent latch up effect, and improves the precision of laser gyro.
According to an aspect of the present invention, provide a kind of laser gyro, comprise laser aid, polarization splitting prism, gyroscope cavity, beat frequency measurement mechanism, gyroscope cavity comprises the first to the 6th side surface, wherein:
Laser aid, for providing laser beam to polarization splitting prism;
Polarization splitting prism, for after receiving the laser beam that laser aid provides, sending to the first side surface of gyroscope cavity, the second light beam formed being sent to the 4th side surface of gyroscope cavity by transmission by the first light beam by reflecting to form;
Wherein the first light beam arrives the second side surface after entering gyroscope cavity by the first side surface, first light beam is arrived the 3rd side surface by after the second side surface total reflection, first light beam is got back to the first side surface by after the 3rd side surface total reflection, and there is the first reflection and the first transmission at the first side surface, wherein the first folded light beam again arrives the second side surface and is totally reflected, thus the first light path that formation the first light beam is rotated counterclockwise between the first to the 3rd side surface, the first transmitted light beam arrives the first input end of beat frequency measurement mechanism;
Second light beam arrives the 5th side surface after entering gyroscope cavity by the 4th side surface, second light beam is arrived the 6th side surface by after the 5th side surface total reflection, second light beam is got back to the 4th side surface by after the 6th side surface total reflection, and there is the second reflection and the second transmission at the 4th side surface, wherein the second folded light beam again arrives the 5th side surface and is totally reflected, thus the second light path that formation the second light beam turns clockwise between the 4th to the 6th side surface, the second transmitted light beam arrives the second input end of beat frequency measurement mechanism;
Wherein the first light path and the second light path not overlapping;
Beat frequency measurement mechanism, the second transmitted light beam that the first transmitted light beam utilizing first input end to receive and the second input end receive carries out beat frequency process.
The present invention arranges gyroscope cavity in laser gyro, gyroscope cavity comprises the first to the 6th side surface, wherein provide laser beam by laser aid to polarization splitting prism, polarization splitting prism is after receiving the laser beam that laser aid provides, the first light beam by reflecting to form being sent to the first side surface of gyroscope cavity, the second light beam formed being sent to the 4th side surface of gyroscope cavity by transmission.Wherein the first light beam arrives the second side surface after entering gyroscope cavity by the first side surface, first light beam is arrived the 3rd side surface by after the second side surface total reflection, first light beam is got back to the first side surface by after the 3rd side surface total reflection, and there is the first reflection and the first transmission at the first side surface, wherein the first folded light beam again arrives the second side surface and is totally reflected, thus the first light path that formation the first light beam is rotated counterclockwise between the first to the 3rd side surface, the first transmitted light beam arrives the first input end of beat frequency measurement mechanism.Second light beam arrives the 5th side surface after entering gyroscope cavity by the 4th side surface, second light beam is arrived the 6th side surface by after the 5th side surface total reflection, second light beam is got back to the 4th side surface by after the 6th side surface total reflection, and there is the second reflection and the second transmission at the 4th side surface, wherein the second folded light beam again arrives the 5th side surface and is totally reflected, thus the second light path that formation the second light beam turns clockwise between the 4th to the 6th side surface, second transmitted light beam arrives the second input end of beat frequency measurement mechanism, simultaneously the first light path and the second light path not overlapping.Because the beam path turned clockwise in gyroscope cavity is not overlapping with the beam path be rotated counterclockwise, thus the laser beam generation latch up effect avoided in the parasitic light and another light path that laser beam in a light path produces, improve the precision of laser gyro.
Description of the invention provides in order to example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of laser gyro in prior art.
Fig. 2 is the schematic diagram of a laser gyro of the present invention embodiment.
Fig. 3 is the stereographic map of gyroscope cavity in Fig. 2.
Fig. 4 is the schematic diagram of another embodiment of laser gyro of the present invention.
Fig. 5 is the stereographic map of gyroscope cavity in Fig. 4.
Fig. 6 is the schematic diagram of the another embodiment of laser gyro of the present invention.
Fig. 7 is the stereographic map of gyroscope cavity in Fig. 6.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention is wherein described.
Fig. 2 is the schematic diagram of a laser gyro of the present invention embodiment.As shown in Figure 2, laser gyro comprises laser aid 201, polarization splitting prism 202, gyroscope cavity 203, beat frequency measurement mechanism 204, and gyroscope cavity comprises the first to the 6th side surface.Wherein:
Laser aid 201, for providing laser beam to polarization splitting prism.
Polarization splitting prism 202, for after receiving the laser beam that laser aid 201 provides, the first light beam by reflecting to form being sent to the first side surface 211 of gyroscope cavity 203, the second light beam formed being sent to the 4th side surface 214 of gyroscope cavity 203 by transmission.
Wherein the first light beam arrives the second side surface 212 after entering gyroscope cavity by the first side surface 211, first light beam is totally reflected rear arrival the 3rd side surface 213 by the second side surface 212, first light beam gets back to the first side surface 211 after being totally reflected by the 3rd side surface 213, and there is the first reflection and the first transmission at the first side surface 211, wherein the first folded light beam again arrives the second side surface 212 and is totally reflected, thus the first light path 221 that formation the first light beam is rotated counterclockwise between the first to the 3rd side surface, first transmitted light beam arrives the first input end of beat frequency measurement mechanism 204.
Second light beam arrives the 5th side surface 215 after entering gyroscope cavity by the 4th side surface 214, second light beam is totally reflected rear arrival the 6th side surface 216 by the 5th side surface 215, second light beam gets back to the 4th side surface 214 after being totally reflected by the 6th side surface 216, and there is the second reflection and the second transmission at the 4th side surface 214, wherein the second folded light beam again arrives the 5th side surface 215 and is totally reflected, thus the second light path 222 that formation the second light beam turns clockwise between the 4th to the 6th side surface, second transmitted light beam arrives the second input end of beat frequency measurement mechanism 204.
Wherein the first light path 221 and the second light path 222 not overlapping.
Beat frequency measurement mechanism 204, the second transmitted light beam that the first transmitted light beam utilizing first input end to receive and the second input end receive carries out beat frequency process.
Based on the laser gyro that the above embodiment of the present invention provides, in laser gyro, gyroscope cavity is set, gyroscope cavity comprises the first to the 6th side surface, wherein provide laser beam by laser aid to polarization splitting prism, polarization splitting prism is after receiving the laser beam that laser aid provides, the first light beam by reflecting to form being sent to the first side surface of gyroscope cavity, the second light beam formed being sent to the 4th side surface of gyroscope cavity by transmission.Wherein the first light beam arrives the second side surface after entering gyroscope cavity by the first side surface, first light beam is arrived the 3rd side surface by after the second side surface total reflection, first light beam is got back to the first side surface by after the 3rd side surface total reflection, and there is the first reflection and the first transmission at the first side surface, wherein the first folded light beam again arrives the second side surface and is totally reflected, thus the first light path that formation the first light beam is rotated counterclockwise between the first to the 3rd side surface, the first transmitted light beam arrives the first input end of beat frequency measurement mechanism.Second light beam arrives the 5th side surface after entering gyroscope cavity by the 4th side surface, second light beam is arrived the 6th side surface by after the 5th side surface total reflection, second light beam is got back to the 4th side surface by after the 6th side surface total reflection, and there is the second reflection and the second transmission at the 4th side surface, wherein the second folded light beam again arrives the 5th side surface and is totally reflected, thus the second light path that formation the second light beam turns clockwise between the 4th to the 6th side surface, second transmitted light beam arrives the second input end of beat frequency measurement mechanism, simultaneously the first light path and the second light path not overlapping.Because the beam path turned clockwise in gyroscope cavity is not overlapping with the beam path be rotated counterclockwise, thus the laser beam generation latch up effect avoided in the parasitic light and another light path that laser beam in a light path produces, improve the precision of laser gyro.
In another specific embodiment of the present invention, gyroscope cavity adopts the crystal with six side surface structures, six side surfaces of crystal processes two groups of laser and runs light path.In laser aid, laser is produced by LASER Light Source (as semiconductor, solid state laser, fiber laser or gas laser), after isolator, by PBS, laser is divided into two-way, and in gyroscope cavity, forms the complete nonoverlapping light path of two-way.Because light path is not overlapping, the parasitic light that therefore in light path, catoptron produces oppositely can not participate in another bundle laser operation, thus effectively prevent the latch up effect of laser gyro.In beat frequency measurement mechanism, after two bundles are swashed combiner, carry out beat frequency process by photodetector, to carry out the measurement of angle of laser gyro.
In another specific embodiment of the present invention, in order to guarantee the one-way of light path further, first isolator 231 is set in the first light path 221, second isolator 232 is set in the second light path 222, the parasitic light avoiding a certain road laser in two light paths to produce further and another road laser generation latch up effect.
In fig. 2, shown gyroscope cavity 203 is the vertical view of gyroscope cavity.M1 to M8 is completely reflecting mirror.Fig. 3 is the stereographic map of gyroscope cavity 203.
Fig. 4 is the schematic diagram of another embodiment of laser gyro of the present invention.Compared with embodiment illustrated in fig. 2, gyroscope cavity 401 is except comprising the first side surface to the 6th side surface 411-416, the intersection being also included in the second side surface 412, the 3rd side surface 413, the 4th side surface 414 and gyroscope cavity end face 430 arranges heptalateral surface 417, arranges the 8th side surface 418 in the intersection of the first side surface 411, the 5th side surface 415, the 6th side surface 416 and gyroscope cavity end face 430.In the diagram, M1 to M8 is completely reflecting mirror, and shown gyroscope cavity 401 is the vertical view of gyroscope cavity.Fig. 5 is the stereographic map of this gyroscope cavity.
Wherein, first light beam arrives the second side surface 412 after entering gyroscope cavity by the first side surface 411, first light beam is totally reflected rear arrival heptalateral surface 417 by the second side surface 412, first light beam arrives the 3rd side surface 413 after the total reflection of heptalateral surface 417, first light beam gets back to the first side surface 411 after being totally reflected by the 3rd side surface 413, and there is the first reflection and the first transmission at the first side surface 411, wherein the first folded light beam again arrives the second side surface 411 and is totally reflected, thus form the first light beam at the first side surface 411, second side surface 412, heptalateral surface 417, the first light path 421 be rotated counterclockwise between 3rd side surface 413.First transmitted light beam arrives the first input end of beat frequency measurement mechanism 204.
Second light beam arrives the 5th side surface 415 after entering gyroscope cavity by the 4th side surface 414, second light beam is totally reflected rear arrival the 8th side surface 418 by the 5th side surface 415, second light beam is arrival the 6th side surface 416 after the 8th side surface 418 is totally reflected, second light beam gets back to the 4th side surface 414 after being totally reflected by the 6th side surface 416, and there is the second reflection and the second transmission at the 4th side surface 414, wherein the second folded light beam again arrives the 5th side surface 415 and is totally reflected, thus form the second light beam at the 4th side surface 414, 5th side surface 415, 8th side surface 418, the second light path 422 turned clockwise between 6th side surface 416.Second transmitted light beam arrives the second input end of beat frequency measurement mechanism 204.Now the first light path 421 and the second light path 422 still not overlapping.
According to another specific embodiment of the present invention, in the first light path 421, first light beam arrives second path on heptalateral surface 417 from the second side surface 412 and the first light beam arrives the 3rd path of the 3rd side surfaces 413 from heptalateral surface 417, is positioned at by the first light beam outside the first path that the first side surface 411 arrives the second side surface 412 and the plane that is made up of from the 4th path that the 3rd side surface 413 arrives the first side surface 411 the first light beam.That is, the first light path is not in same plane.
In the second light path 422, second light beam arrives the 6th path of the 8th side surface 418 from the 5th side surface 415 and the second light beam arrives the 7th path of the 6th side surface 416 from the 8th side surface 418, is positioned at by the second light beam outside the 5th path that the 4th side surface 414 arrives the 5th side surface 415 and the plane that is made up of from the 8th path that the 6th side surface 416 arrives the 4th side surface 414 the second light beam.That is, the second light path is not in same plane.
According to another specific embodiment of the present invention, the material that gyroscope cavity adopts is gain medium or quartz crystal medium.For gain medium, Solid State Laser exciting media Nd:YAG crystal can be used.This crystal is processed, obtains some total reflection surfaces, vibrate in the light path that laser beam is formed in the medium, thus can, in conjunction with the advantage of gain media chamber and ring resonator, make laser have good single mode single-frequency characteristic.
According to another specific embodiment of the present invention, the first light beam incides the first side surface with 45 °, and the second light beam incides the 4th side surface with 45 °.
According to another specific embodiment of the present invention, the angle that heptalateral surface 417, the 8th side surface 418 are formed with gyroscope cavity end face is respectively less than 90 °.
According to another specific embodiment of the present invention, the angle that heptalateral surface 417, the 8th side surface 418 are formed with gyroscope cavity end face is respectively 45 °.Now can allow larger mismachining tolerance, and need less magnetic field to ensure the running of laser beam.Such as, if the first light beam is 15mm at the incidence point of the first side surface and the distance of the second light beam between the incidence point of the 4th side surface, then the length of the first light path and the second light path is about 30mm.
According to another specific embodiment of the present invention, the angle that heptalateral surface 417, the 8th side surface 418 are formed with gyroscope cavity end face is respectively 0 °.Now heptalateral surface 417, the 8th side surface 418 respectively with gyroscope cavity top surface being parallel, be the situation of 45 ° compared to angle, this structure can allow larger mismachining tolerance, but needs larger magnetic field to ensure the running of laser beam.
The schematic diagram of laser gyro when being 0 ° that Fig. 6 is above-mentioned angle.In figure 6, shown gyroscope cavity 203 is the vertical view of gyroscope cavity.Fig. 7 is the stereographic map of this gyroscope cavity.
Although The present invention gives the specific embodiment setting up nonoverlapping light path between 6 side surfaces and 8 side surfaces of crystal, but it will be appreciated by persons skilled in the art that the crystal that also can utilize and have other side surface quantity or the cavity be made up of multiple catoptron realize the present invention.
Claims (8)
1. a laser gyro, is characterized in that, laser gyro comprises laser aid, polarization splitting prism, gyroscope cavity, beat frequency measurement mechanism, and gyroscope cavity comprises the first to the 6th side surface, wherein:
Laser aid, for providing laser beam to polarization splitting prism;
Polarization splitting prism, for after receiving the laser beam that laser aid provides, sending to the first side surface of gyroscope cavity, the second light beam formed being sent to the 4th side surface of gyroscope cavity by transmission by the first light beam by reflecting to form;
Wherein the first light beam arrives the second side surface after entering gyroscope cavity by the first side surface, first light beam is arrived the 3rd side surface by after the second side surface total reflection, first light beam is got back to the first side surface by after the 3rd side surface total reflection, and there is the first reflection and the first transmission at the first side surface, wherein the first folded light beam again arrives the second side surface and is totally reflected, thus the first light path that formation the first light beam is rotated counterclockwise between the first to the 3rd side surface, the first transmitted light beam arrives the first input end of beat frequency measurement mechanism;
Second light beam arrives the 5th side surface after entering gyroscope cavity by the 4th side surface, second light beam is arrived the 6th side surface by after the 5th side surface total reflection, second light beam is got back to the 4th side surface by after the 6th side surface total reflection, and there is the second reflection and the second transmission at the 4th side surface, wherein the second folded light beam again arrives the 5th side surface and is totally reflected, thus the second light path that formation the second light beam turns clockwise between the 4th to the 6th side surface, the second transmitted light beam arrives the second input end of beat frequency measurement mechanism;
Wherein the first light path and the second light path not overlapping;
Beat frequency measurement mechanism, the second transmitted light beam that the first transmitted light beam utilizing first input end to receive and the second input end receive carries out beat frequency process.
2. laser gyro according to claim 1, it is characterized in that, the intersection that gyroscope cavity is also included in the second side surface, the 3rd side surface, the 4th side surface and gyroscope cavity end face arranges heptalateral surface, in the intersection of the first side surface, the 5th side surface, the 6th side surface and gyroscope cavity end face, the 8th side surface is set, wherein:
In the first light path, first light beam arrives the second side surface after entering gyroscope cavity by the first side surface, first light beam is arrived heptalateral surface further by after the second side surface total reflection, first light beam arrives the 3rd side surface after the total reflection of heptalateral surface, and the first light beam is got back to the first side surface by after the 3rd side surface total reflection;
In the second light path, second light beam arrives the 5th side surface after entering gyroscope cavity by the 4th side surface, second light beam is arrived the 8th side surface further by after the 5th side surface total reflection, second light beam arrives the 6th side surface after the 8th side surface total reflection, and the second light beam is got back to the 4th side surface by after the 6th side surface total reflection.
3. laser gyro according to claim 2, is characterized in that,
In the first light path, first light beam arrives second path on heptalateral surface from the second side surface and the first light beam arrives the 3rd path of the 3rd side surface from heptalateral surface, is positioned at by the first light beam outside the first path that the first side surface arrives the second side surface and the plane that is made up of from the 4th path that the 3rd side surface arrives the first side surface the first light beam;
In the second light path, second light beam arrives the 6th path of the 8th side surface from the 5th side surface and the second light beam arrives the 7th path of the 6th side surface from the 8th side surface, is positioned at by the second light beam outside the 5th path that the 4th side surface arrives the 5th side surface and the plane that is made up of from the 8th path that the 6th side surface arrives the 4th side surface the second light beam.
4. laser gyro according to claim 2, is characterized in that,
The angle that heptalateral surface, the 8th side surface are formed with gyroscope cavity end face is respectively less than 90 °.
5. laser gyro according to claim 4, is characterized in that,
The angle that heptalateral surface, the 8th side surface are formed with gyroscope cavity end face is respectively 45 °.
6. the laser gyro according to any one of claim 1-5, is characterized in that,
First light beam incides in the first side surface with 45 °, and the second light beam incides in the 4th side surface with 45 °.
7. the laser gyro according to any one of claim 1-5, is characterized in that,
The material that gyroscope cavity adopts is gain medium or quartz crystal medium.
8. laser gyro according to claim 7, is characterized in that,
The material that gyroscope cavity adopts is Solid State Laser exciting media Nd:YAG crystal.
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