Laser pulse energy stabilizing system and laser gas detector

Abstract

The present disclosure provides a laser pulse energy stabilizing system and a laser gas detector, comprising: a laser, the pulse energy of the output initial pulse laser being adjustable; a first beam splitter, used for splitting the initial pulse into a first detection pulse laser and a first working pulse laser; a laser attenuator, used for attenuating the received first working pulse laser and outputting an attenuated pulse laser; a second beam splitter, used for splitting the attenuated pulse laser into a second detection pulse laser and a second working pulse laser; a pulse energy detection module, used for detecting a first pulse energy of the first detection pulse laser and a second pulse energy of the second detection pulse; and a control module, connected with the laser and the laser attenuator respectively, used for regulating the pulse energy of the initial pulse laser output by the laser and the attenuation multiple of the laser attenuator, so as to keep the pulse energy of the second working pulse laser stable.

Description

Technical Field

[0001] This disclosure relates to the field of laser technology, and in particular to a laser pulse energy stabilization system and a laser gas detector. Background Technology

[0002] Laser gas detectors, which detect atmospheric composition based on laser beams, are crucial for environmental monitoring. The laser is one of the core components of a laser gas detector, and in practical applications, existing laser gas detectors often suffer from the following problems:

[0003] Firstly, the laser is an output laser with no adjustable output (taking a common current-controlled laser as an example, the control current inside the current-controlled laser always remains constant). During long-term operation, the laser will gradually age, causing the pulse energy of the actual output laser to continuously decrease. This leads to a continuous decrease in the pulse energy of the laser output by the laser gas detector, and the feedback signal generated by the interaction between the laser and atmospheric components becomes weaker. This not only reduces the detection sensitivity, making it difficult to detect low concentrations of atmospheric components, but also leads to a decrease in measurement accuracy and a significant reduction in data reliability.

[0004] Secondly, in order to ensure the sensitivity and detection accuracy of the laser gas detector, the laser needs to be replaced once it shows slight signs of aging. This means that the laser has a short lifespan and needs to be replaced frequently. This not only increases the high cost, but also causes the interruption of monitoring data, which seriously affects the analysis of long-term trends in atmospheric composition. Utility Model Content

[0005] This disclosure aims to address at least one of the technical problems existing in the prior art, and proposes a laser pulse energy stabilization system and a laser gas detector.

[0006] In a first aspect, embodiments of this disclosure provide a laser pulse energy stabilization system, comprising:

[0007] A laser for outputting an initial pulse laser, wherein the pulse energy of the output initial pulse laser is adjustable;

[0008] The first beam splitter is disposed in the optical path between the laser and the laser attenuator, and is used to split the initial pulse laser beam into a first detection pulse laser and a first working pulse laser according to a first preset beam splitting ratio.

[0009] A laser attenuator is used to attenuate the received first working laser pulse and output an attenuated laser pulse.

[0010] The second beam splitter is disposed in the output optical path of the laser attenuator and is used to split the attenuated pulse laser into a second detection pulse laser and a second working pulse laser according to a second preset beam splitting ratio.

[0011] A pulse energy detection module is used to detect the first pulse energy of the first detection pulse laser and the second pulse energy of the second detection pulse.

[0012] The control module, connected to the laser and the laser attenuator respectively, is used to regulate the pulse energy of the initial pulse laser output by the laser and the attenuation factor of the laser attenuator, so as to keep the pulse energy of the second working pulse laser stable.

[0013] In some embodiments, the control module is also connected to the pulse energy detection module, and the control module is further configured to obtain the first pulse energy and the second pulse energy from the pulse energy detection module.

[0014] In some embodiments, the pulse energy detection module includes: a first photodetector and a second photodetector that are independent of each other;

[0015] The first photodetector is disposed in the optical path of the first detection pulse laser and is used to receive the first detection pulse laser and determine the first pulse energy of the first detection pulse laser.

[0016] The second photodetector is disposed in the optical path of the second detection pulse laser and is used to receive the second detection pulse laser and determine the second pulse energy of the second detection pulse laser.

[0017] In some embodiments, the laser is a current-controlled laser, and the pulse energy of the initial pulse laser output by the laser increases with the increase of the control current;

[0018] The control module controls the pulse energy of the initial pulse laser output by the laser by adjusting the control current of the laser.

[0019] In some embodiments, the control current of the laser is configured to be continuously adjustable within a corresponding adjustable range;

[0020] Alternatively, the control current of the laser can be configured to be discretely adjustable within a corresponding adjustable range.

[0021] In some embodiments, the laser is an LD side-pumped electro-optically Q-switched infrared laser.

[0022] In some embodiments, the minimum attenuation factor of the laser attenuator is 2 times, and the maximum attenuation factor of the laser attenuator is 100 times.

[0023] In some embodiments, the attenuation factor of the laser attenuator is configured to be continuously adjustable within a corresponding adjustable range.

[0024] In some embodiments, the value range of the first preset splitting ratio is: [1:99, 1:9];

[0025] The range of the second preset splitting ratio is: [1:99, 1:9].

[0026] In a second aspect, embodiments of this disclosure provide a laser gas detector, including: the laser pulse energy stabilization system as described in the first aspect above.

[0027] The technical solution disclosed herein can enable testing personnel to calculate the pulse energy of the initial pulse laser actually output by the laser, the pulse energy of the first working pulse laser, the pulse energy of the pulse laser actually output by the laser attenuator, and the pulse energy of the second working pulse laser based on the first pulse energy and the second pulse energy. Based on this, the control module can adjust the pulse energy of the initial pulse laser output by the laser and the attenuation factor of the laser attenuator, thereby achieving stable control of the pulse energy of the second working pulse laser.

[0028] Furthermore, even if the laser experiences aging or malfunctions, the control module can adjust the laser output and the attenuation factor of the laser attenuator to maintain a stable pulse energy for the second working pulsed laser, eliminating the need to replace the laser. This effectively extends the lifespan of the laser and reduces the frequency of replacement. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a laser pulse energy stabilization system provided in an embodiment of the present disclosure;

[0030] Figure 2 A schematic diagram of another laser pulse energy stabilization system provided in this embodiment of the present disclosure;

[0031] Figure 3 This is a flowchart illustrating a method for the control module to regulate the control current of the laser and the attenuation factor of the laser attenuator in an embodiment of this disclosure. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0034] In the various figures, the same elements are represented by similar reference numerals. For clarity, not all parts in the figures are drawn to scale. Furthermore, some well-known parts may not be shown in the figures.

[0035] Many specific details of this disclosure are described below to provide a clearer understanding of it. However, as those skilled in the art will understand, this disclosure may be implemented without following these specific details.

[0036] In the following description, the splitting ratio of a beam splitter refers to the ratio of the pulse energy of the detection pulse laser and the working pulse laser split from the original laser. The attenuation factor of an optical attenuator refers to the ratio of the pulse energy of the laser pulse laser input to the laser attenuator to the pulse energy of the laser pulse laser output from the laser attenuator.

[0037] Figure 1 This is a schematic diagram of a laser pulse energy stabilization system provided in an embodiment of this disclosure. Figure 1 As shown, the laser pulse energy stabilization system includes: a laser, a first beam splitter, a laser attenuator, a second beam splitter, a pulse energy detection module, and a control module.

[0038] The laser is used to output an initial pulse laser, and the pulse energy of the output initial pulse laser is adjustable.

[0039] The first beam splitter is disposed in the optical path between the laser and the laser attenuator. The first beam splitter is used to split the initial pulse laser beam into a first detection pulse laser and a first working pulse laser according to a first preset beam splitting ratio.

[0040] The laser attenuator is used to attenuate the received first working pulse laser and output the attenuated pulse laser.

[0041] The second beam splitter is located in the output optical path of the laser attenuator and is used to split the attenuated pulse laser into a second detection pulse laser and a second working pulse laser according to a second preset beam splitting ratio.

[0042] The pulse energy detection module is used to detect the first pulse energy of the first detection pulse laser and the second pulse energy of the second detection pulse.

[0043] The control module is connected to the laser and the laser attenuator respectively. The control module is used to regulate the pulse energy of the initial pulse laser output by the laser and the attenuation factor of the laser attenuator so that the pulse energy of the second working pulse laser is kept stable, that is, the pulse energy of the second working pulse laser is kept within the required preset stable working pulse energy range.

[0044] It should be noted that the laser is located to the left of the laser attenuator, the pulse energy detection module is located above the laser, and the control module is located below the laser in the attached figures. These are merely examples of the attached figures in this disclosure and do not limit the technical solutions of this disclosure.

[0045] In this disclosure, the first detection pulsed laser is used as a sample of the initial pulsed laser output by the laser. The pulse energy detection module can acquire the first detection pulsed laser and determine the corresponding first pulse energy. Based on the first preset splitting ratio of the first beam splitter, the second pulse energy of the first working pulsed laser and the pulse energy of the initial pulsed laser actually output by the laser can be determined.

[0046] Taking a first preset splitting ratio of 1:a as an example, the first pulse energy of the first detection pulse laser is E1. At this time, the pulse energy of the first working pulse laser is a*E1. Without considering the light loss during the splitting process, the pulse energy of the initial pulse laser is (a+1)*E1.

[0047] Similarly, based on the second preset splitting ratio of the second beam splitter and the second pulse energy of the second detection pulse laser determined by the pulse energy detection module, the second pulse energy of the first working pulse laser and the pulse energy of the initial pulse laser actually output by the laser can be determined.

[0048] Taking the second preset splitting ratio of 1:b as an example, the second pulse energy of the second detection pulse laser is E2. At this time, the pulse energy of the second working pulse laser is b*E2. Without considering the light loss during the splitting process, the pulse energy of the actual output pulse laser of the laser attenuator is (b+1)*E2.

[0049] Based on the above, when the testing personnel obtain the first pulse energy of the first detection pulse laser as E1 and the second pulse energy of the second detection pulse laser as E2 through the pulse energy detection module, they can calculate the pulse energy of the initial pulse laser actually output by the laser (a+1)*E1, the pulse energy of the first working pulse laser a*E1, the pulse energy of the pulse laser actually output by the laser attenuator (b+1)*E2, and the pulse energy of the second working pulse laser b*E2. Based on these data, the testing personnel can use the control module to send corresponding control signals to the laser and the laser attenuator respectively to control the output of the laser and the output of the laser attenuator, thereby keeping the pulse energy of the second working pulse laser stable.

[0050] Specifically, when the calculated pulse energy of the second working pulse laser is within the preset stable working pulse energy range, the pulse energy of the initial pulse laser output by the laser is kept constant, and the attenuation factor of the laser attenuator is maintained.

[0051] When the calculated pulse energy of the second working pulse laser is less than the lower limit of the preset stable working pulse energy range, the pulse energy of the initial pulse laser output by the laser can be appropriately increased while keeping the attenuation factor of the laser attenuator unchanged, or the attenuation factor of the laser attenuator can be appropriately decreased while keeping the pulse energy of the initial pulse laser output by the laser unchanged, or both the pulse energy of the initial pulse laser output by the laser attenuator and the attenuation factor of the laser attenuator can be adjusted accordingly (considering that the low pulse energy of the second working pulse laser is mostly due to the aging of the laser causing a decrease in the actual output pulse energy of the initial pulse laser, the pulse energy of the initial pulse laser output by the laser is generally increased. At this time, the attenuation factor of the laser attenuator may need to be increased or decreased) so that the pulse energy of the second working pulse laser is increased to the preset stable working pulse energy range.

[0052] When the calculated pulse energy of the second working pulse laser exceeds the upper limit of the preset stable working pulse energy range (e.g., the laser malfunctions), the pulse energy of the initial pulse laser output by the laser can be appropriately reduced while keeping the attenuation factor of the laser attenuator constant, or the attenuation factor of the laser attenuator can be appropriately increased while keeping the initial pulse laser output by the laser constant, or both the pulse energy of the initial pulse laser output by the laser attenuator and the attenuation factor of the laser attenuator can be adjusted accordingly (considering that the high pulse energy of the second working pulse laser is mostly due to the laser malfunction causing an increase in the actual output pulse energy of the initial pulse laser, the pulse energy of the initial pulse laser output by the laser is generally reduced, and the attenuation factor of the laser attenuator may need to be increased or decreased in this case), so that the pulse energy of the second working pulse laser is increased to the preset stable working pulse energy range.

[0053] As can be seen from the above, the technical solution disclosed herein can enable testing personnel to calculate the pulse energy of the initial pulse laser actually output by the laser, the pulse energy of the first working pulse laser, the pulse energy of the pulse laser actually output by the laser attenuator, and the pulse energy of the second working pulse laser based on the first pulse energy and the second pulse energy. Based on this, the control module can adjust the pulse energy of the initial pulse laser output by the laser and the attenuation factor of the laser attenuator, thereby achieving the goal of keeping the pulse energy of the second working pulse laser stable.

[0054] Furthermore, even if the laser experiences aging or malfunctions, the control module can adjust the laser output and the attenuation factor of the laser attenuator to maintain a stable pulse energy for the second working pulsed laser, eliminating the need to replace the laser. This effectively extends the lifespan of the laser and reduces the frequency of replacement.

[0055] Furthermore, based on the calculated pulse energy of the first working pulsed laser and the pulse energy of the attenuated pulsed laser actually output by the laser attenuator, the actual attenuation factor of the laser attenuator can also be effectively calculated. By comparing the actual attenuation factor of the laser attenuator with the set attenuation factor configured by the control module, it can be determined whether the laser attenuator is malfunctioning. This can provide a basis for the testing personnel to adjust the laser attenuator. For example, if the actual attenuation factor is equal to the set attenuation factor, it means that the laser attenuator is working normally; otherwise, it means that the laser attenuator is malfunctioning.

[0056] When the laser attenuator malfunctions, a certain compensation amount can be applied during adjustment. For example, if the actual attenuation factor is detected to be greater than the set attenuation factor, and the desired actual attenuation factor of the laser attenuator is c1, a control command can be sent to the laser attenuator through the control module to indicate that the set attenuation factor is d1 (the specific value is set according to the actual situation), where d1 is less than c1. If the actual attenuation factor is detected to be greater than the set attenuation factor, and the desired actual attenuation factor of the laser attenuator is c2, a control command can be sent to the laser attenuator through the control module to indicate that the set attenuation factor is d2 (the specific value is set according to the actual situation), where d2 is greater than c.

[0057] In some embodiments, considering that the detection pulse laser is used for sampling and detection, while the working pulse laser is used for actual work, in order to ensure laser utilization, the ratio of the detection pulse laser to the working pulse laser split from the same laser should be as small as possible. However, at the same time, it is necessary to avoid the problem that the detection pulse laser is difficult to detect due to insufficient energy. Based on the above considerations, the range of the first preset splitting ratio (including the endpoint value) in this disclosure is [1:99, 1:9]; the range of the second preset splitting ratio (including the endpoint value) is [1:99, 1:9].

[0058] In this disclosure, the specific values ​​of the first preset spectral ratio and the second preset spectral ratio can be preset and adjusted according to actual needs. For example, the values ​​of both the first preset spectral ratio and the second preset spectral ratio are 1:99.

[0059] In some embodiments, the pulse energy detection module includes: a first photodetector and a second photodetector that are independent of each other. The first photodetector is disposed in the optical path of the first detection pulse laser to receive the first detection pulse laser and determine the first pulse energy of the first detection pulse laser; the second photodetector is disposed in the optical path of the second detection pulse laser to receive the second detection pulse laser and determine the second pulse energy of the second detection pulse laser.

[0060] In this disclosure, the photodetector can receive pulsed laser light and output a corresponding electrical signal for characterizing the pulse energy.

[0061] It should be noted that the above-mentioned pulse energy detection module, which includes two independent photodetectors, is only one optional implementation scheme in this disclosure. Other methods can also be used to detect the first / second detection pulse laser in this disclosure, such as using only one photodetector and a movable device, with the movable device driving the photodetector to move and detect the pulse energy of the first and second detection pulse lasers respectively; other cases will not be described in detail here.

[0062] In some embodiments, the laser is a current-controlled laser, and the pulse energy of the initial pulse laser output by the laser increases with the increase of the control current; the control module controls the pulse energy of the initial pulse laser output by the laser by adjusting the control current of the laser.

[0063] In some embodiments, the laser is a side-pumped electro-optic Q-switched infrared laser (LD), and the corresponding control current is the LD current. The LD side-pumped electro-optic Q-switched infrared laser modulates the laser pulse based on pump energy control and electro-optic Q-switching technology. Specifically, light of a specific wavelength emitted by a laser diode (LD) is used to illuminate the laser gain medium from the side. Side-pumping allows for a more uniform distribution of the pump light in the gain medium, and higher single-pulse energy can be obtained by increasing the pump power (pumping principle). Furthermore, the Q-value (also known as the "quality factor") of the laser resonator is controlled through the electro-optic effect. During the pumping phase, the Q-value of the resonator is set to a low state, causing a large accumulation of particles in the laser medium, resulting in a population inversion distribution. When the particle count accumulates to a certain level, the state of the electro-optic elements is rapidly changed, causing the Q-value of the resonator to increase instantaneously. At this point, the photons within the cavity rapidly gain gain, generating a giant pulse laser output (electro-optic Q-switching principle).

[0064] In some embodiments, the control current of the laser is configured to be continuously adjustable within a corresponding adjustable range. As an example, the adjustable range of the control current (including the endpoint value) is 8A to 12A, and the specific value of the control current can be any value within 8A to 12A.

[0065] In other embodiments, the control current of the laser is configured to be discretely adjustable within a corresponding adjustable range. As an example, the adjustable range of the control current (including the endpoint value) is 8A to 12A, and the specific value of the control current can be any of the five values ​​of 8A, 9A, 10A, 11A, and 12A.

[0066] In some embodiments, the minimum attenuation factor of the laser attenuator is 2 times, and the maximum attenuation factor of the laser attenuator is 100 times.

[0067] Further optionally, the attenuation factor of the laser attenuator is configured to be continuously adjustable within a corresponding adjustable range. As an example, the adjustable range of the attenuation factor (including the endpoint value) is 2 to 100 times, and the specific value of the attenuation factor can be any value within 2 to 100 times.

[0068] Figure 2 A schematic diagram of another laser pulse energy stabilization system provided in this embodiment of the present disclosure. Figure 2 As shown, the control module is also connected to the pulse energy detection module, and the control module is also used to obtain the first pulse energy and the second pulse energy from the pulse energy detection module.

[0069] Alternatively, the control module can also be used to adjust the pulse energy of the initial pulse laser output by the laser and the attenuation factor of the laser attenuator according to the first pulse energy and the second pulse energy.

[0070] Optionally, the laser is a current-controlled laser, and the control module can be used to adjust the control current of the laser and the attenuation factor of the laser attenuator according to the energy of the first pulse and the energy of the second pulse.

[0071] Figure 3 This is a flowchart illustrating a method for adjusting the control current of a laser and the attenuation factor of a laser attenuator in an embodiment of this disclosure. Figure 3 As shown, the control method includes:

[0072] Step S1: Obtain the current second pulse energy of the second detection pulse laser, and determine the current pulse energy of the second working pulse laser based on the obtained second pulse energy and the second preset splitting ratio.

[0073] The pulse energy of the second working pulsed laser is equal to the quotient of the second pulse energy and the second preset splitting ratio. Taking the second pulse energy as E2 and the second preset splitting ratio as 1:b as an example, the pulse energy of the second working pulsed laser is b*E2.

[0074] Step S2: Detect whether the current pulse energy of the second working pulse laser is within the preset stable working pulse energy range.

[0075] If the pulse energy of the second working pulse laser is detected to be within the preset stable working pulse energy range (including the endpoint value), it indicates that the laser output is stable, and step S3 is executed; if the pulse energy of the second working pulse laser is detected to be outside the preset stable working pulse energy range, step S4 is executed.

[0076] Step S3: Control the laser to maintain the current control current and control the laser attenuator to maintain the current attenuation factor.

[0077] Step S4: Obtain the current first pulse energy of the first detection pulse laser, and determine the current pulse energy of the first working pulse laser based on the obtained first pulse energy and the first preset splitting ratio; and determine the pulse energy of the ideal attenuation pulse laser based on the preset target stable pulse energy and the second preset splitting ratio.

[0078] The pulse energy of the first working pulse laser is equal to the quotient of the first pulse energy and the first preset splitting ratio. Taking the first pulse energy as E1 and the first preset splitting ratio as 1:a as an example, the pulse energy of the first working pulse laser is a*E2.

[0079] The pulse energy of an ideal attenuated pulsed laser is equal to 1 plus the product of the sum of the second preset splitting ratio and the preset target stable pulse energy. Taking the preset target stable pulse energy as Et and the second preset splitting ratio as 1:b as an example, the pulse energy of the ideal attenuated pulsed laser is (1+1 / b)*Et.

[0080] The preset target stable pulse energy is a value within the preset stable working pulse energy range. The specific value can be preset according to actual needs. For example, the preset target stable pulse energy is the middle value (the average of the two endpoint values) of the preset stable working pulse energy range.

[0081] After step S4 is completed, proceed to step S5.

[0082] Step S5: Calculate the quotient of the current pulse energy of the first working pulse laser and the pulse energy of the ideal attenuated pulse laser to obtain the first calculation result, and check whether the first calculation result is within the adjustable range of the attenuation factor of the laser attenuator.

[0083] The first calculation result characterizes the required attenuation factor of the laser attenuator under the current pulse energy of the first working pulse laser and the ideal attenuation pulse laser conditions.

[0084] If the first calculation result is detected to be within the adjustable range of the attenuation factor of the laser attenuator, then step S6a is executed; if the first calculation result is detected to be less than the lower limit of the adjustable range of the attenuation factor of the laser attenuator, then step S6b is executed; if the first calculation result is detected to be greater than the upper limit of the adjustable range of the attenuation factor of the laser attenuator, then step S6c is executed.

[0085] Step S6a: Control the laser to maintain the current control current, and control the laser attenuator to adjust the attenuation factor to the first calculation result.

[0086] Step S6b: Control the laser to increase the current control current by a first preset adjustment amount, and control the laser attenuator to maintain the current attenuation factor.

[0087] After step S6b is completed, step S1 is executed again.

[0088] If the first calculated result is determined to be less than the lower limit of the adjustable range of the attenuation factor of the laser attenuator, the control current should be increased to increase the pulse energy of the pulsed laser output by the laser, thereby increasing the first calculated result.

[0089] The first preset adjustment amount can be designed according to the characteristics of the laser. For example, the first preset adjustment amount can be 1A, that is, the current control current of the laser is increased by 1A in step S6b.

[0090] Step S6c: Control the laser to reduce the current control current by the second preset adjustment amount, and control the laser attenuator to maintain the current attenuation factor.

[0091] After step S6c is completed, step S1 is executed again.

[0092] If the first calculated result is determined to be greater than the upper limit of the adjustable range of the attenuation factor of the laser attenuator, the control current should be reduced to decrease the pulse energy of the pulsed laser output by the laser, thereby reducing the first calculated result.

[0093] The second preset adjustment amount can be designed according to the characteristics of the laser. For example, the second preset adjustment amount can be 1A, that is, the current control current of the laser is reduced by 1A in step S6c.

[0094] It should be noted that in practical applications, the specific value range of the preset stable working pulse energy range is set according to the actual required "stability"; of course, in some specific cases, the preset stable working pulse energy range can be a specific value (i.e., the lower limit and the upper limit of the range are equal), and this situation will not affect the technical solution of this disclosure.

[0095] The above algorithm can effectively adjust the attenuator to maintain the current attenuation factor and / or the laser to adjust the current control current when the current pulse energy of the second working pulse laser is outside the preset stable working pulse energy range, so that the current pulse energy of the second working pulse laser is stabilized within the preset stable working pulse energy range.

[0096] Based on the same inventive concept, this disclosure also provides a laser gas detector, which includes a laser pulse energy stabilization system. The laser pulse energy stabilization system adopts the laser pulse energy stabilization system provided in the previous embodiment, and the details can be found in the foregoing.

[0097] By employing the aforementioned laser pulse energy stabilization system, the stability of the laser pulses output by the laser gas detector can be effectively guaranteed, thus ensuring the sensitivity and detection accuracy of the laser gas detector.

[0098] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A laser pulse energy stabilization system, characterized in that, include: A laser for outputting an initial pulse laser, wherein the pulse energy of the output initial pulse laser is adjustable; The first beam splitter is disposed in the optical path between the laser and the laser attenuator, and is used to split the initial pulse laser beam into a first detection pulse laser and a first working pulse laser according to a first preset beam splitting ratio. A laser attenuator is used to attenuate the received first working laser pulse and output an attenuated laser pulse. The second beam splitter is disposed in the output optical path of the laser attenuator and is used to split the attenuated pulse laser into a second detection pulse laser and a second working pulse laser according to a second preset beam splitting ratio. A pulse energy detection module is used to detect the first pulse energy of the first detection pulse laser and the second pulse energy of the second detection pulse. The control module, connected to the laser and the laser attenuator respectively, is used to regulate the pulse energy of the initial pulse laser output by the laser and the attenuation factor of the laser attenuator, so as to keep the pulse energy of the second working pulse laser stable.

2. The laser pulse energy stabilization system according to claim 1, characterized in that, The control module is also connected to the pulse energy detection module, and the control module is also used to obtain the first pulse energy and the second pulse energy from the pulse energy detection module.

3. The laser pulse energy stabilization system according to claim 1, characterized in that, The pulse energy detection module includes: a first photodetector and a second photodetector that are independent of each other; The first photodetector is disposed in the optical path of the first detection pulse laser and is used to receive the first detection pulse laser and determine the first pulse energy of the first detection pulse laser. The second photodetector is disposed in the optical path of the second detection pulse laser and is used to receive the second detection pulse laser and determine the second pulse energy of the second detection pulse laser.

4. The laser pulse energy stabilization system according to claim 1, characterized in that, The laser is a current-controlled laser, and the pulse energy of the initial pulse laser output by the laser increases with the increase of the control current. The control module controls the pulse energy of the initial pulse laser output by the laser by adjusting the control current of the laser.

5. The laser pulse energy stabilization system according to claim 4, characterized in that, The control current of the laser is configured to be continuously adjustable within a corresponding adjustable range; Alternatively, the control current of the laser can be configured to be discretely adjustable within a corresponding adjustable range.

6. The laser pulse energy stabilization system according to claim 4, characterized in that, The laser is an LD side-pumped electro-optic Q-switched infrared laser.

7. The laser pulse energy stabilization system according to claim 1, characterized in that, The minimum attenuation factor of the laser attenuator is 2 times, and the maximum attenuation factor of the laser attenuator is 100 times.

8. The laser pulse energy stabilization system according to claim 1, characterized in that, The attenuation factor of the laser attenuator is configured to be continuously adjustable within a corresponding adjustable range.

9. The laser pulse energy stabilization system according to claim 1, characterized in that, The range of the first preset splitting ratio is: [1:99, 1:9]; The range of the second preset splitting ratio is: [1:99, 1:9].

10. A laser gas detector, characterized in that, include: The laser pulse energy stabilization system as described in any one of claims 1 to 9 above.

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