KR101451784B1 - Dual-mode raman laser system and operational method - Google Patents

Abstract

The present invention relates to a dual-mode Raman laser system and an operational method thereof. Suggested is a dual-mode Raman laser system which simultaneously realizes two methods which can generate a Raman laser. Based on it, Raman laser characteristic optimized with regard to an operational environment is produced by applying a method of selecting one of two Raman lasers generated according to the operational environment and laser conditions. Ultimately, the accurate performance of a system applied to a laser can be maintained regardless of operational environment characteristics.

Description

DUAL-MODE RAMAN LASER SYSTEM AND OPERATIONAL METHOD BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

In particular, the present invention relates to a dual mode Raman laser system and a method of operating the dual mode Raman laser system.

An atomic interferometer is a technique for precisely measuring various physical quantities using atomic oscillation. Recently, with the rapid development of cryogenic atomic cooling technologies such as laser cooling and Bose-Einstein condensation, atomic interferometer related technologies using these technologies are being developed together with active research on precision of various physical quantities using an atomic interferometer at a laboratory level .

An atomic interferometer can be roughly classified into a mechanical lattice-based atomic interferometer, a magnetic-field-based atomic interferometer, and a laser-based atomic interferometer depending on the technology of separating, reflecting and interfering atoms for interferometer implementation. At present, the most technologically advanced and precise physical measurement method is the Raman laser technology. In fact, many advanced research institutes in the world have developed the atomic interferometer method using Raman laser, It is a tendency to experimentally demonstrate that it can go beyond the physical measurement technology.

One of the most important factors to be considered in the atomic interferometer using the Raman laser method is to provide a precise control of the relative phase between the main lasers constituting the Raman laser. Relative phase information between the two lasers at the time of separating, reflecting, and interfering with an atom is transferred to the interferometer signal, which appears together with the physical quantity to be measured in the interfering signal.

Generally, the phase between two independent lasers changes with time. Therefore, it is essential to stabilize the phase between two lasers when using two separate lasers with a Raman laser to measure precise physical quantities through an atomic interferometer .

Recently, a widely used method for the implementation of Raman laser in an atomic interferometer experiment is to detect the phase change between two lasers by using the beat signals of two independent lasers and to convert the electric signal proportional to the detected phase change into one of the lasers Feedback is the way. However, this method exhibits excellent phase stabilization characteristics in a stable environment as in a laboratory. However, when the external physical quantities such as vibration and impact are applied, the phase stabilization control may not be normally performed, or even if the control is performed, have.

On the other hand, when the side-band and carrier frequency bands generated by modulating one laser are used as Raman lasers, since the two laser frequency components are generated from one laser, And it is possible to easily realize a stable Raman laser. In this method, unlike the method of stabilizing the phase through electrical control, the principle of generating the laser having the same phase by using the modulation characteristic of the laser is used. Therefore, even if a harsh external physical quantity such as vibration or impact is applied, There is an advantage that the relative phase is not changed.

However, the above-described method has disadvantages of generating unnecessary single-sideband or high-mode harmonics generated in the process of generating the Raman laser. The generated unnecessary sideband and high harmonic components may cause a systematic error in the atomic interferometer due to the fact that two independent lasers are stabilized by phase control in a stable environment, Which may lead to output errors.

Also, unlike the method of phase stabilization of two independent lasers by electrical control, the method of generating Raman lasers of two frequency components through one laser modulation can be performed independently of the laser corresponding to each frequency component, There is a disadvantage that it is difficult to change laser characteristics such as polarization.

As a result, the method of implementing the Raman laser for the atomic interferometer can be summarized in two ways. However, there are advantages and disadvantages according to the operating environment and the purpose of use, and ultimately, There is no current way to get there.

Apart from the atomic interferometer technology, Raman laser technology is widely used in various physical and optical fields such as electromagnetic induction transmission and absorption, Raman velocity selection, DWDM, spectroscopy, and optoelectronic high precision oscillator. If the field is in an environment where severe external physical quantities such as vibration, shock, etc. are applied, the above-mentioned problem is equally expressed.

Accordingly, it is an object of the present invention to provide a Raman laser system and a method of operating the same, which can solve the above-described problems.

Another object of the present invention is to provide a dual mode Raman laser system and a method of operating the dual mode Raman laser system in which two kinds of Raman laser generation methods are simultaneously implemented and a Raman laser generated by one method is selected according to the operating environment and laser condition .

It is still another object of the present invention to provide a Raman laser system capable of operating a dual mode Raman laser with minimal components and an operation method thereof.

According to an aspect of the present invention, there is provided a method of operating a dual mode Raman laser system, comprising: a first operation mode for generating a Raman laser through phase control based on an electrical control between a main laser and a longitudinal laser; Operating a laser; Operating a Raman laser in a second operation mode of generating a Raman laser by optically modulating a main laser frequency-stabilized by a reference laser; And selecting one of the two operation modes according to the operating environment and the state of the laser.

In the first operation mode, both the main laser and the longitudinal laser are used, and in the second mode, only the main laser is used.

Wherein the step of selecting one of the two operation modes comprises the steps of detecting a phase difference between a beat signal generated by the main laser and the seed laser and a stable high frequency signal through a phase detector; Feeding back the generated electrical signal proportional to the detected phase difference to the slave laser through the phase controller to stabilize the slave laser to the main laser; Determining an output characteristic of the phase detector; And determining a Raman laser operating mode according to an operating environment of the Raman laser and a state of the laser based on the output characteristics of the analyzed phase detector.

Wherein selecting one of the two modes of operation comprises: operating a Raman laser in a first mode of operation; Determining an output characteristic of the phase detector; And automatically switching to a second mode of operation when the output characteristic of the phase detector is difficult to guarantee the performance of the Raman laser, wherein the output characteristic of the phase detector during the second mode of operation ensures the performance of the Raman laser If it is difficult, the operation mode is switched again to the first operation mode.

According to an aspect of the present invention, there is provided a dual mode Raman laser system including: a first operation mode unit for generating a Raman laser through phase control based on electrical control between a main laser and a longitudinal laser; A second operation mode operating section for generating a Raman laser by optically modulating the main laser; And a digital controller for determining the output characteristics of the phase detector used for phase stabilization between the main laser and the longitudinal laser, and selectively operating the first and second operation mode operation units according to the operation environment and the state of the laser.

In the first operation mode, both the main laser and the longitudinal laser are used. In the second mode, only the main laser is used, and the longitudinal laser is phase-stabilized to the main laser.

The digital controller detects a phase difference between a beat signal generated by a main laser and a longitudinal laser and a stable high frequency signal in a phase detector and feeds an electric signal proportional to the detected phase difference to the longitudinal laser through a phase controller, To the main laser, the operation mode is changed based on the output characteristic of the phase detector.

The digital controller automatically determines the output characteristic of the phase detector when operating the Raman laser in the first operation mode and automatically switches to the second operation mode when the output characteristic of the phase detector is difficult to guarantee the performance of the Raman laser, It is determined whether to maintain the second operation mode or to switch to the first operation mode depending on whether the output characteristic of the phase detector can guarantee the performance of the Raman laser during the second operation mode operation.

The present invention proposes a dual mode laser system capable of simultaneously implementing two methods capable of generating Raman lasers, and based on this, a method of selecting one of two Raman lasers generated according to the operating environment and the laser state is applied Thereby optimizing the Raman laser characteristic for the operating environment and ultimately maintaining the precise performance of the system to which the laser is applied regardless of the operating environment characteristics.

In addition, the present invention has an effect of realizing a laser system that can integrate similar functions and implement many functions using a relatively small number of components through optimization design for diversification of functions.

1 is a schematic view of a dual mode Raman laser system for an atomic interferometer according to an embodiment of the present invention;
2 is a conceptual diagram illustrating a frequency distribution of a laser according to an operation mode according to the present invention.
3 is a flowchart illustrating a method of operating a dual mode Raman laser system for an atomic interferometer according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted.

In addition, the embodiment described below corresponds to the case of a laser system required for an atomic interferometer and includes other parts necessary for the atomic interference crazing in addition to the dual mode Raman laser generation and operation.

The means necessary for the present invention can be roughly summarized in two ways.

First, the present invention proposes a laser system capable of simultaneously implementing two methods capable of generating a Raman laser.

In order to realize the atomic interferometer, a cooling laser and a re-pumping laser, which are used for cooling cryogenic atoms in addition to the Raman laser, and a detection laser necessary for state preparation / selection and detection are required. As much as possible, various lasers necessary for the atomic interferometer can be realized with minimum components, so that efficient laser system design is possible.

Accordingly, the present invention provides a laser system capable of generating two types of lasers for the atomic interferometer, and three modes of operation for the Raman laser. In other words, the minimum number of independent lasers required in the laser system for the atomic interferometer that realizes the Raman laser through the phase stabilization based on the electrical control based on the present invention is three, and in the present invention, the same three independent lasers, The number of components provides a laser system capable of operating in two Raman laser modes.

Second, the present invention observe the output characteristics of a phase detector used for phase stabilization based on electrical control in a laser system capable of operating in two Raman laser modes, and the characteristics of a Raman laser realized through phase stabilization In this paper, we propose a method to select the operating mode of Raman laser in real time so as to maintain stable and optimized atomic interferometer performance in arbitrary operating environment.

Hereinafter, a dual mode Raman laser system for an atomic interferometer according to an embodiment of the present invention and a method of operating the same will be described with reference to the accompanying drawings.

As described above, the present invention relates to a technique for improving an atomic interferometer to have a precise performance irrespective of the characteristics of an operating environment, and ultimately to develop an optimized Raman laser characteristic for an operating environment. We propose an optimal laser system for an atomic interferometer that can simultaneously implement two Raman laser generation methods that have advantages and disadvantages, and use a method of selecting one of two Raman lasers generated according to the operating environment and laser condition .

1 is a configuration diagram of a dual mode Raman laser system for an atomic interferometer according to an embodiment of the present invention.

1, the laser system for an atomic interferometer includes a main laser 11, a longitudinal laser 19, a backlight breaker 12, 110, a light focusing and distributing device 13, 14, 111, 119, A photodetector 15 and 112, a frequency controller 16, a phase detector 113, a phase controller 114, a frequency mover 117, an optical modulator 118, optical amplifiers 120 and 127, An analog-to-digital converter (ADC) 137, a digital controller 138, a digital-to-analog converter (DAC) 139, A high frequency signal source 17, 116, 123, 132 and 135 and a control signal source 18, 115, 124, 125, 131, 133, 134, 136 and 141.

Here, a portion for generating a Raman laser through phase control based on electrical control is referred to as a first operation mode operation portion, and a second operation mode operation portion for generating a Raman laser through modulation. In the first operation mode, the main laser and the longitudinal laser are used, and in the second mode, only the main laser is used. In particular, no signal is input to the optical modulator 18 in the first mode of operation.

The main laser 11 is frequency shifted from the reference laser by a frequency of the high frequency signal source 18 applied to the frequency controller 16 through the frequency controller 16 using a reference laser frequency- Frequency stabilized. The reference laser used may also be used for the atomic state preparation / selection and detection process itself.

The frequency stabilized main laser 11 is input to the optical modulator 118 via the frequency shifter 117. The frequency shifter 117 gradually changes the frequency of the cooling laser for deep cooling during laser cooling. If the frequency controller 16 can take such a function, the frequency shifter 117 can be omitted. The frequency mover 117 may be implemented using an acousto-optic modulator (AOM) or the like.

The optical modulator 118 may be an optical phase modulator in the form of an electro-optical modulator (EOM), and may further modulate the input main laser 11 to add a sideband It is responsible for creating.

The laser modulated by the optical modulator 118 may be amplified through the optical amplifier 120 at the laser cooling time during operation of the atomic interferometer, and then utilized as a pair of a cooling laser and a re-pumping laser necessary for laser cooling. The laser modulated by the optical modulator 118 is amplified by the optical amplifier 127 through the optical converging and distributing units 119 and 126 at the time of separation, reflection, and interference of the atoms, and is then passed through the acoustooptic modulator 128 Can be used as a Raman laser. Here, the acousto-optic modulator 128 serves as a high-speed shutter for generating Raman laser pulses. When generating the Raman laser through the optical modulator 128, a high frequency source 17 (not shown) applied to the frequency controller 16 to have a frequency remote from the absorption line of the resonator, as opposed to generating a cooling laser and a pair of re- ) Should be large.

Thus, the present invention can generate both the cooling laser, the re-pumping laser pair and the Raman laser pair through the modulation of the main laser, and the shutter 140 is provided to block the influence of the slave laser 19.

On the other hand, the slave laser 19 meets with the main laser 11 in the light focusing and distributing device 111, and is in proportion to the phase difference between the beat signal generated thereby and the highly stable high frequency signal input to the phase detector 113 The slave laser 19 is phase stabilized to the main laser 11 by feeding back the electrical signal to the slave laser 19 through the phase controller 114. [

When generating the cooling laser, the re-pumping laser pair and the Raman laser pair through the electrical control based phase stabilization, the main laser 11 and the slave laser 19 constitute each pair And the high frequency signal source 123 is not applied to the optical modulator 118, and the shutter 121 is cut off.

That is, when the laser is cooled, the main laser 11 and the longitudinal laser 19, which are appropriately frequency shifted and phase-stabilized, are converged in the light focusing and distributing unit 126 and amplified in the optical amplifier 127, And can be utilized as a cooling laser and a repumping laser pair by being input to the light focusing and distributing device 122 via the use mirror 129. In a similar fashion, the appropriate frequency shift and phase stabilized main lasers 11 and longitudinal lasers 19 in the separation, reflection and interference of the atoms are available as Raman laser pairs in the acousto-optic modulator 128.

 In the process of state selection and detection, only the re-pumping laser, not the cooling laser or the re-pumping laser pair, is needed alone. In this case, by regulating the amplitude of the modulating signal input to the optical modulator, . Further, only the phase stabilized slave laser 19 having a set frequency at the time of laser cooling may be used. To do this, the two shutters 121 and 125 must be shut off.

The above-mentioned optical unit may be composed of optical fiber-based elements if necessary, and in this case, it is possible to realize a laser system in which a laser beam is connected to an optical fiber. In this case, the half mirror 129 is not necessary, and one output of the acousto-optic modulator 128 can be directly connected to the shutter 130 side with the optical fiber.

A portion of the output of the phase detector 113 is converted to a digital signal by an analog-to-digital converter (ADC) 137 and then input to the digital controller 138 to verify the phase stabilization state. The digital controller 138 determines the change of the laser operation mode only based on the preset reference value and the output of the phase detector 113 confirmed through the ADC 137 to control the laser operation mode Signals.

In addition, the digital controller 138 generates control signals to appropriately apply the lasers necessary for the atomic interferometer at a specific time according to a predetermined laser implementation method in the process of laser cooling, state selection, and detection. The generated digital control signals are converted into analog signals in the DAC 139, and are then applied to the respective parts for performing operations by receiving control signals.

2 is a conceptual diagram illustrating a frequency distribution of a laser according to an operation mode according to the present invention.

As described above, the cooling laser and the re-pumping laser pair are implemented by a method using modulation, and the Raman laser selectively uses both methods using phase control and modulation based on electrical control.

In FIG. 2, the operation mode classification refers to the division according to the operation of the Raman laser. In the first operation mode (P-Mode), a mode using Raman laser implemented through phase control based on electrical control, M-mode) means a mode using a Raman laser generated through modulation.

Referring to the frequency distribution diagram 21 in which the cooling laser and the re-pumping laser pair are implemented through the modulation in FIG. 2, ω ₀ corresponds to the cycling transition line of the atom used for laser cooling. For laser cooling, the main laser is redshifted by ω ₀ δ to frequency stabilize, and the re-pumping laser corresponds to ω _c + α generated by modulating the frequency-stabilized main laser using a high-frequency signal with a frequency of α . The sideband and higher harmonic components generated by the other modulations are not resonant to the absorption line of the atoms and therefore have little effect on laser cooling.

The second operating mode frequency distribution map 23 also includes a frequency distribution diagram 21 that implements the cooling laser and the re-pumping laser pair through modulation, except that the second operating mode frequency distribution map 23 also has a large frequency shift as long as it is in a non- And the frequency components in the dotted rectangle generated through modulation are utilized as a Raman laser. The first operating mode frequency distribution map 22 also shows that the frequency components in the dotted line are the same as the second operating mode frequency distribution map 23 but the unnecessary sideband and higher harmonics components identified in the second operating mode frequency distribution map 23 Can be confirmed.

3 is a flowchart illustrating a method of operating a dual mode Raman laser system for an atomic interferometer according to an embodiment of the present invention.

As shown in FIG. 3, first, an initialization step 31 for setting information on a method of operating a dual mode Raman laser is performed.

The above information is confirmed by preliminary testing of the π and π / 2 pulse times of the Raman laser operating modes, and the Raman laser pulse time, the frequency shift of the Raman laser to the atomic absorption line, the operation mode change a method for determining whether to maintain one of a first operation mode and a second operation mode when the operation mode is maintained, a method for maintaining a laser state according to characteristics of a control error signal identified in the phase detector, And the like.

When the initialization step is performed, the digital controller 138 performs a step 32 of confirming the set laser operation method. In step 31, it is determined whether to change the operation mode of the Raman laser based on the laser operation method set in the initialization step 31 or not.

If the maintenance of the Raman laser operating mode is set, the digital controller 138 moves to the Raman laser operating mode checking step 36, which confirms what operating mode to hold. If it is confirmed that the first operation mode is maintained, the digital controller 138 moves to the first operation mode operation step 37 in which the Raman laser is operated in the first operation mode.

)이 고장에 준하는

값이내에 해당하면 제1동작모드 동작 상태를 유지한다. 반면에, 제어 오차 신호 특성(

)이 고장에 준하는

값보다 크면, 디지털 제어기(138)는 제1동작모드는 더 이상 제어가 되지 않는 고장 상태로 보고 제2동작모드 동작 단계(38)로 이동한다. In the first operating mode operation step 37, the digital controller 138 receives the control error signal characteristic (< RTI ID = 0.0 >

) Based on this failure

Value, the first operation mode operation state is maintained. On the other hand, the control error signal characteristic (

) Based on this failure

Value, the digital controller 138 moves to the second operating mode operating step 38 by reporting the first operating mode to a fault condition that is no longer controlled.

In the second operation mode operation, there is no problem that the phase between the Raman lasers changes due to a severe external physical quantity, and therefore, it is maintained. In this process, if the broken control is released again in the first operation mode operation and measures are taken to enable normal operation again, the digital controller 138 moves to the initialization step 31 again, .

On the other hand, when the operation method of changing the operation mode of the Raman laser is selected in the laser operation method confirmation step 32, the digital controller 138 moves to the first operation mode operation step 33 to operate the Raman laser in the first operation mode .

)에 따라 다음 단계를 결정한다. 즉, 초기화 단계(31)에서 제어 오차 신호 특성(

)이 T값 이내에 드는 것이 정상 동작으로 설정된 경우, 상기 일정 시간동안 확인된 제어 오차 신호 특성(

)이 T값보다 작을 경우에는 제1동작모드 동작 단계(33)을 유지하고, 제어 오차 신호 특성(

)이 T값 보다 커서 제1동작모드에서 라만 레이저 성능을 보장하기 힘든 경우 제2동작모드 동작 단계(35)로 이동한다. 제2동작모드 동작 단계(35)에서 다시 제어 오차신호 특성(

)이 정상동작에 해당하는 T값보다 작은 영역에 있음이 감지되면, 디지털 제어기(138)는 다시 제1동작모드 동작 단계(33)로 이동한다. The digital controller 138 then compares the control error signal characteristics (< RTI ID = 0.0 >

) To determine the next step. That is, in the initialization step 31, the control error signal characteristic (

) Is set to a normal operation, the control error signal characteristic

) Is smaller than the T value, the first operation mode operation step 33 is maintained, and the control error signal characteristic (

) Is greater than the T value and it is difficult to guarantee the Raman laser performance in the first operation mode, the operation proceeds to the second operation mode operation step (35). In the second operation mode operation step 35, the control error signal characteristic (

Is in an area smaller than the T value corresponding to the normal operation, the digital controller 138 moves again to the first operation mode operation step 33. [

)이 고장에 준하는

값보다 큰 값으로 확인될 경우 디지털 제어기(138)는 제2동작모드 동작 단계(34)로 이동하고 제2동작모드 라만 레이저 동작을 유지한다. 이 과정에서 제1동작모드 동작에서 깨어진 제어를 다시 풀고 다시 정상적인 동작이 가능하도록 조치를 취한다면 디지털 제어기(138)는 다시 초기화 단계(31)로 이동하여 초기화 단계에서 설정된 방법에 따라 다시 동작 시퀀스를 수행한다. Further, in the first operation mode operation step 33, the control error signal characteristic (

) Based on this failure

Value, the digital controller 138 moves to the second operation mode operation step 34 and maintains the laser operation only in the second operation mode. In this process, if the broken control is released again in the first operation mode operation, and the countermeasure is taken to enable the normal operation again, the digital controller 138 moves to the initialization step 31 again and performs the operation sequence again according to the method set in the initialization step .

As described above, the present invention proposes a laser system capable of simultaneously implementing the above-described two methods capable of generating a Raman laser, and based on this, selects one of two Raman lasers generated according to the operating environment and the laser condition Method can be used to create optimized Raman laser characteristics for the operating environment and ultimately maintain the precise performance of the atomic interferometer regardless of the operating environment characteristics.

In addition, the present invention selects and applies a laser system for an atomic interferometer capable of operating a dual mode Raman laser using only a minimum number of components, and a Raman laser suitable for the operating environment and laser characteristic conditions.

The dual mode Raman laser system and the method of operating the same according to the present invention are not limited to electromagnetic induction and absorption, Raman velocity selection, dense wavelength division multiplexing (DWDM), spectroscopy , Optoelectronic high precision oscillators, and the like.

Accordingly, it is possible to realize a laser system for a small and multifunctional atomic interferometer through the present invention. Generally, in order to implement a system having many functions, a large number of parts are required to implement required functions. In such a case, there is a drawback that the size of the system becomes large and complicated. However, in the present invention, it is possible to realize a laser system that can integrate similar functions and implement many functions using a relatively small number of parts through optimization design for diversification of functions.

In addition, existing technologies using only an electric control based Raman laser to improve the performance of an atomic interferometer may cause a failure or a high measurement error in a severe operating environment. In addition, in the case of the conventional technique using only the Raman laser generated through the modulation for the application of the Raman laser which is robust to the severe operating environment, a high measurement error can be caused compared to the case of applying the Raman laser through the phase stabilization in the stable environment.

However, since the present invention can select and use a suitable Raman laser in real time in a given operating environment, there is no risk of failure even in a severe operating environment as compared with an existing interferometer using only one Raman laser, An atomic interferometer can be realized which has a high performance.

It is to be understood that the configurations and methods of the embodiments described above are not limitedly applied, but that the embodiments may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive.

11: main laser 12: longitudinal laser
16: Frequency controller 113: Photodetector
114: phase controller 118: optical modulator
138: Digital controller

Claims (10)

Operating the system in a first operation mode for generating a Raman laser through phase control based on electrical control between the main laser and the seed laser;
Operating an atomic interferometer in a second mode of operation for generating a Raman laser by optically modulating the main laser; And
And selecting one of the two operation modes according to the operation environment of the atomic interferometer and the state of the laser. 2. The method of claim 1, wherein in the first mode of operation
Wherein a main laser and a longitudinal laser are used, and in the second mode of operation only the main laser is used. 2. The method of claim 1, wherein selecting one of the two modes of operation comprises:
Detecting a phase difference between a beat signal generated by the main laser and the longitudinal laser and a stable high frequency signal through a phase detector;
Generating an electrical signal proportional to the detected phase difference through a phase controller and feeding back the electrical signal to the longitudinal laser to phase stabilize the longitudinal laser to the main laser;
Determining an output characteristic of the phase detector; And
And determining a Raman laser operation mode according to an operating environment of the atomic interferometer and a laser condition based on the determined output characteristics of the phase detector. 2. The method of claim 1, wherein selecting one of the two modes of operation comprises:
Operating an atomic interferometer in a first mode of operation;
Determining an output characteristic of the phase detector; And
And automatically switching to a second operation mode when the output characteristic of the phase detector is difficult to guarantee the performance of the Raman laser,
It is determined whether to maintain the second operation mode or to switch to the first operation mode depending on whether the output characteristic of the phase detector during the second operation mode operation can guarantee the performance of the Raman laser in the first operation mode And then applying the same to the dual mode Raman laser system. The method of claim 1, wherein the frequency-stabilized laser is a reference laser and the reference laser is a frequency-stabilized laser. The laser is a cooling laser, a re-pumping laser, a detection laser, State laser, a state-selective laser, and a Raman laser at a specific point in time and operates the dual-mode Raman laser system. A first operating mode operating unit for generating a Raman laser through phase control based on electrical control between the main laser and the longitudinal laser;
A second operation mode operating section for generating a Raman laser by optically modulating the main laser; And
And a digital controller for judging an output characteristic of the phase detector used for phase stabilization between the main laser and the seed laser and selectively operating the first and second operation mode operation units according to the operating environment and the laser state, system. 7. The method of claim 6, wherein in the first mode of operation
Wherein both the main laser and the longitudinal laser are used and only the main laser is used in the second mode of operation and the longitudinal laser is phase stabilized to the main laser. 7. The apparatus of claim 6, wherein the digital controller
A phase detector detects a phase difference between a beat signal generated by the main laser and the longitudinal laser and a stable high frequency signal, and an electric signal proportional to the detected phase difference is fed back to the longitudinal laser through the phase controller, And the operating mode is changed based on an output characteristic of the phase detector when the phase is stabilized. 7. The apparatus of claim 6, wherein the digital controller
The output characteristic of the phase detector can be determined when the atomic interferometer is operated in the first operation mode, and it is possible to switch to the second operation mode when the output characteristic of the Raman laser is difficult to guarantee the performance of the Raman laser, Characterized in that it is determined whether to maintain the second operation mode or to switch to the first operation mode according to whether the output characteristic of the detector can guarantee the performance of the Raman laser in the first operation mode and to apply it Mode Raman laser system. 7. The method of claim 6, wherein the frequency-stabilized laser is a reference laser and the reference laser is a frequency-stabilized laser. The cooling laser, the re-pumping laser, the detection laser, State laser, a state-selective laser, and a Raman laser at a specific point in time and operates the dual-mode Raman laser system.

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