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CN-121983844-A - Dual-path beam combining Raman laser power time-sharing locking device and method

CN121983844ACN 121983844 ACN121983844 ACN 121983844ACN-121983844-A

Abstract

The invention discloses a double-path beam combining Raman laser power time-sharing locking device and method, wherein an acousto-optic modulator is used for dividing an optical signal emitted by a laser into a first optical path and a second optical path, the first power modulator and a first diaphragm are sequentially arranged along the first optical path, the second power modulator and the second diaphragm are sequentially arranged along the second optical path, the first optical path and the second optical path are both intersected with a beam combining prism, a power detection assembly is arranged on an output optical path of the beam combining prism, the first diaphragm and the second diaphragm are alternately opened at a preset time sequence, the power of the first optical path or the second optical path is monitored through the power detection assembly, the optical power of the first optical path is fed back and regulated through the first power modulator, and the optical power of the second optical path is fed back and regulated through the second power modulator according to a monitoring result, so that the power of the first optical path and the second optical path is locked within a preset error range.

Inventors

  • FU ZHUO
  • XIA WENJUN
  • Ma Kongrui
  • BAI YINGJIE

Assignees

  • 中科酷原科技(武汉)有限公司

Dates

Publication Date
20260505
Application Date
20251224

Claims (10)

  1. 1. The double-path beam combining Raman laser power time-sharing locking device is characterized by comprising a laser (1), an acousto-optic modulator (2), a first power modulator (3), a first diaphragm (4), a second power modulator (5), a second diaphragm (6), a beam combining prism (7) and a power detection assembly (8), wherein: The acousto-optic modulator (2) is used for dividing an optical signal emitted by the laser (1) into a first optical path and a second optical path, the first power modulator (3) and the first diaphragm (4) are sequentially arranged along the first optical path, the second power modulator (5) and the second diaphragm (6) are sequentially arranged along the second optical path, the first optical path and the second optical path are both intersected in the light combining prism (7), and the power detection assembly (8) is arranged on an output optical path of the light combining prism (7); the first diaphragm (4) and the second diaphragm (6) are alternately opened at a preset time sequence, the power of the first optical path or the second optical path is monitored through the power detection assembly (8), the feedback adjustment of the optical power is carried out on the first optical path through the first power modulator (3) according to the monitoring result, and the feedback adjustment of the optical power is carried out on the second optical path through the second power modulator (5) according to the monitoring result, so that the power locking of the first optical path and the second optical path is realized within a preset error range.
  2. 2. The dual-path beam-combining raman laser power time-sharing locking device according to claim 1, wherein the first power modulator (3) comprises a first liquid crystal wave plate (31) and a first polarization splitting prism (32), the first liquid crystal wave plate (31) and the first polarization splitting prism (32) are sequentially arranged along a first optical path, the first liquid crystal wave plate (31) is used for changing the polarization angle of an optical signal on the first optical path, and the optical signal with the corresponding polarization angle is emitted with the corresponding optical power after passing through the first polarization splitting prism (32); When the first diaphragm (4) is opened and the second diaphragm (6) is closed, the first liquid crystal wave plate (31) is regulated according to the optical power monitoring result of the power detection assembly (8) on the first optical path, so that the optical power of the first optical path is regulated to be preset power.
  3. 3. The dual-path beam-combining raman laser power time-sharing locking device according to claim 1, wherein the second power modulator (5) comprises a second liquid crystal wave plate (51) and a second polarization splitting prism (52), the second liquid crystal wave plate (51) and the second polarization splitting prism (52) are sequentially arranged along a second optical path, the second liquid crystal wave plate (51) is used for changing the polarization angle of an optical signal on the second optical path, and the optical signal with the corresponding polarization angle is emitted with the corresponding optical power after passing through the second polarization splitting prism (52); when the second diaphragm (6) is opened and the first diaphragm (4) is closed, the second liquid crystal wave plate (51) is regulated according to the optical power monitoring result of the power detection assembly (8) on the second optical path, so that the optical power of the second optical path is regulated to be the preset power.
  4. 4. The two-way beam combining raman laser power time sharing locking device according to claim 1, characterized in that the two-way beam combining raman laser power time sharing locking device further comprises a third diaphragm (9), wherein: the third diaphragm (9) is arranged on the output light path of the light combining prism (7) and is positioned between the power detection assembly (8) and an external system; Before an external system receives the combined light, the third diaphragm (9) is closed, the first diaphragm (4) and the second diaphragm (6) are alternately opened at a preset time sequence, the power of the first light path or the second light path is monitored through the power detection assembly (8), the feedback adjustment of the optical power of the first light path is carried out through the first power modulator (3) according to the monitoring result, the feedback adjustment of the optical power of the second light path is carried out through the second power modulator (5) according to the monitoring result, and the power locking of the first light path and the second light path is realized within a preset error range; When an external system receives beam combining light, the third diaphragm (9) is opened, the first diaphragm (4) and the second diaphragm (6) are simultaneously opened, the first power modulator (3) and the second power modulator (5) stop corresponding feedback adjustment, the optical signals of the first optical path and the optical signals of the second optical path are emitted in a power locking state within a preset error range through the beam combining prism (7) and then are emitted in beam combining light, and the beam combining light enters the third diaphragm (9) after passing through the third diaphragm (9).
  5. 5. The dual-path beam-combining raman laser power time-sharing locking device according to claim 4, wherein the power detection assembly (8) comprises a photodetector (81) and a beam splitting plate (82), wherein: The light splitting sheet (82) is arranged on an output light path of the light combining prism (7), the light splitting sheet (82) is used for enabling a first preset proportion of the output light path of the light combining prism (7) to be transmitted to the external system along an original light path, the light splitting sheet (82) is also used for reflecting a second preset proportion of the output light path of the light combining prism (7) to the photoelectric detector (81), and the photoelectric detector (81) is used for detecting the light power of a received light signal.
  6. 6. A method for time-sharing locking of two-way beam-combining raman laser power, which is applied to the time-sharing locking device of two-way beam-combining raman laser power according to any one of claims 1 to 5, and is characterized by comprising the following steps: the first diaphragm (4) and the second diaphragm (6) are alternately opened at a preset time sequence, the power of the first optical path or the second optical path is monitored through the power detection assembly (8), the feedback adjustment of the optical power is carried out on the first optical path through the first power modulator (3) according to the monitoring result, and the feedback adjustment of the optical power is carried out on the second optical path through the second power modulator (5) according to the monitoring result, so that the power locking of the first optical path and the second optical path is realized within a preset error range.
  7. 7. The dual beam combining raman laser power time sharing locking method of claim 6, further comprising: A third diaphragm (9) is arranged on the output light path of the light combining prism (7), and the third diaphragm (9) is positioned between the power detection assembly (8) and an external system; Before an external system receives the combined light, the third diaphragm (9) is closed, the first diaphragm (4) and the second diaphragm (6) are alternately opened at a preset time sequence, the power of the first light path or the second light path is monitored through the power detection assembly (8), the feedback adjustment of the optical power of the first light path is carried out through the first power modulator (3) according to the monitoring result, the feedback adjustment of the optical power of the second light path is carried out through the second power modulator (5) according to the monitoring result, and the power locking of the first light path and the second light path is realized within a preset error range; When an external system receives beam combining light, the third diaphragm (9) is opened, the first diaphragm (4) and the second diaphragm (6) are simultaneously opened, the first power modulator (3) and the second power modulator (5) stop corresponding feedback adjustment, the optical signals of the first optical path and the optical signals of the second optical path are emitted in a power locking state within a preset error range through the beam combining prism (7) and then are emitted in beam combining light, and the beam combining light enters the third diaphragm (9) after passing through the third diaphragm (9).
  8. 8. The method for time-sharing locking of the two-way beam-combining raman laser power according to claim 6, wherein the method for alternately opening the first diaphragm (4) and the second diaphragm (6) at a preset time sequence comprises the following steps: Before an external system receives the combined light, the first diaphragm (4) and the second diaphragm (6) are continuously and alternately opened, wherein the first diaphragm (4) is closed for a second preset time period after being opened for a first preset time period, and the second diaphragm (6) is opened for a second preset time period after being closed for the first preset time period; The first preset duration is 15 ms-50 ms, and the second preset duration is 15 ms-50 ms.
  9. 9. The two-way beam combination raman laser power time-sharing locking method according to claim 8, wherein a first preset buffer time period after a first diaphragm (4) is opened, the first power modulator (3) is opened, and an opened state of the first power modulator (3) is maintained until a second preset buffer time period before the first diaphragm (4) is closed, and the first power modulator (3) is closed; the second power modulator (5) is started and keeps the starting state of the second power modulator (5) until a fourth preset buffer time length before the second diaphragm (6) is closed, wherein the second power modulator (5) is closed; the value ranges of the first preset buffer duration, the second preset buffer duration, the third preset buffer duration and the fourth preset buffer duration are 5 ms-8 ms.
  10. 10. The two-way beam combination raman laser power time-sharing locking method according to claim 8, wherein, before a third diaphragm (9) is opened, a fifth preset buffer period is provided, the acousto-optic modulator (2) is closed, meanwhile, the first diaphragm (4) and the second diaphragm (6) are kept in an opened state, the first power modulator (3) and the second power modulator (5) are kept in a closed state, and when a sixth preset buffer period is provided after the third diaphragm (9) is opened, the acousto-optic modulator (2) is opened for a third preset period to transmit short pulse combination light to an external system; And when the acousto-optic modulator (2) is started within a third preset time period, the third diaphragm (9) is in an open state, the fifth preset buffer time period is 2 ms-5 ms, the sixth preset buffer time period is 2 ms-5 ms, and the third preset time period is 1 us-3 us.

Description

Dual-path beam combining Raman laser power time-sharing locking device and method Technical Field The invention belongs to the field of optical communication, and particularly relates to a double-path beam-combining Raman laser power time-sharing locking device and method. Background In neutral atomic quantum computation, two kinds of laser with different frequencies are often required to be used for beam combination at the same time, and the laser is acted on an atomic quantum bit to realize the control of the atomic quantum bit. The most typical is a single bit gate manipulation process that uses raman transitions, which require two frequencies of laser light and which are coherent lasers, to achieve the qubit. The common practice is that the light emitted by the same laser is changed into two laser beams after beam splitting, then one of the two laser beams is subjected to large-range frequency shift to perform power locking, the frequency shift method can be realized by an acousto-optic modulator or an optical fiber electro-optic modulator, the two laser beams are required to be combined after frequency shift, and then the two laser beams are transmitted to a core physical system after being transmitted by the same optical fiber and precisely irradiated on atoms, so that single-bit gate control on the atoms is realized. Since quantum computing requires very high fidelity gate manipulation, this process is mainly determined by the characteristics of the laser, such as the frequency accuracy and stability of the laser, the stability of the laser power, and the stability of the laser pointing. Wherein the power of the laser affects the frequency of the rabi oscillations during a single bit, i.e. affects the time of single bit gate manipulation. Therefore, the combined beam light entering the core physical system needs to be power locked, but short-term jitter or drift often occurs in the transmission process of the laser, so that the optical power of the combined beam light is unstable, and the control fidelity of the single-bit gate is reduced, which is fatal to quantum computation. In the conventional beam combining optical power locking method, power detection is usually required to be performed on an optical signal, feedback adjustment is performed on the optical signal according to a detection result, if the beam combining light after combining two beams of laser beams is directly detected, the power detector cannot directly perform power locking by performing power detection on the two beams of laser beams because the beam combining light is essentially two beams of light transmitted along the same optical path, and if the two beams of laser beams are detected and feedback adjustment is performed on the two beams of laser beams to perform power locking before combining the two beams of laser beams respectively, however, the problem is that the optical power still can be dithered and changed after the two beams of laser beams pass through a device for combining the beams such as a beam combining prism, and the requirement of power locking cannot be met by the beam combining light after subsequent beam combining. In view of this, overcoming the drawbacks of the prior art is a problem to be solved in the art. Disclosure of Invention The invention aims to solve the problem of realizing the power locking of two light paths on a beam combining light path. In a first aspect, a dual-path beam combining raman laser power time-sharing locking device is provided, which comprises a laser 1, an acousto-optic modulator 2, a first power modulator 3, a first diaphragm 4, a second power modulator 5, a second diaphragm 6, a beam combining prism 7 and a power detection assembly 8, wherein: The acousto-optic modulator 2 is used for dividing an optical signal emitted by the laser 1 into a first optical path and a second optical path, the first power modulator 3 and the first diaphragm 4 are sequentially arranged along the first optical path, the second power modulator 5 and the second diaphragm 6 are sequentially arranged along the second optical path, the first optical path and the second optical path are both intersected in the light combining prism 7, and the power detection assembly 8 is arranged on an output optical path of the light combining prism 7; The first diaphragm 4 and the second diaphragm 6 are alternately opened at a preset time sequence, the power of the first optical path or the second optical path is monitored through the power detection assembly 8, the optical power of the first optical path is fed back and regulated through the first power modulator 3 according to the monitoring result, and the optical power of the second optical path is fed back and regulated through the second power modulator 5 according to the monitoring result, so that the power locking of the first optical path and the second optical path is realized within a preset error range. Preferably, the first power modulator 3 includes a