A spectral line broadening modulation device and an atomic spectral line analysis apparatus

Abstract

The utility model relates to the technical field of rubidium atomic spectrum line broadening measurement, especially to a spectrum line broadening modulation device and atomic spectrum line analysis equipment. The utility model sets the working temperature of rubidium bubble to preset low temperature working temperature through temperature control component 3, then manually adjusts optical adjusting component 2 to adjust the optical power of laser signal into rubidium bubble, compensates the intensity of laser signal under low temperature condition, thereby pushes low the lower limit of temperature of available effective signal-to-noise ratio spectrum line, finally realizes the measurement of stable, reliable spectrum line data in wider temperature range from high temperature to lower temperature.

Description

Technical Field

[0001] This utility model relates to the field of rubidium atomic spectral line broadening measurement technology, and in particular to a spectral line broadening modulation device and an atomic spectral line analysis device. Background Technology

[0002] Spectral line broadening is the result of the combined effects of multiple physical factors, including natural atomic broadening and Doppler broadening. These broadening mechanisms directly affect spectral resolution and are widely used in fields such as atomic structure research, laser design, environmental monitoring, and astrophysical analysis. For ease of measurement, modulation is often performed from high to low temperatures. However, because other parameters besides temperature are not changed during modulation to minimize interference, the temperature cannot be lowered further, resulting in a limited measurement range.

[0003] Rubidium has a melting point of approximately 38.89℃. At high temperatures, there are many rubidium atoms, and when a laser beam enters the rubidium atoms, numerous atomic transitions occur, resulting in a very good and stable spectral signal. However, as the temperature decreases, rubidium atoms become less active and absorb less laser light. This leads to increased noise and signal oscillations when the optical power remains constant. Consequently, the temperature cannot be lowered further, resulting in a smaller measurement range and unstable spectral data.

[0004] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Utility Model Content

[0005] The technical problem to be solved by this invention is: how to solve the problem of unstable spectral data obtained when the temperature range is small during rubidium atomic spectral line broadening test.

[0006] The present invention adopts the following technical solution: In a first aspect, a spectral line broadening and modulation device is provided for rubidium atom spectral line broadening and modulation, comprising: a laser 1, an optical adjustment component 2, a temperature control component 3, and a photodetector 4, which are sequentially coupled along the optical path; The laser 1 is used to generate laser signals; The temperature control component 3 is used to accommodate the rubidium bulb and regulate its operating temperature. At a preset low operating temperature, the optical adjustment component 2 is manually adjusted to regulate the intensity of the laser signal injected into the rubidium bulb, thereby obtaining stable spectral data through the photodetector 4.

[0007] Preferably, the optical adjustment component 2 includes a waveplate 20 and a polarizing beam splitter 21 sequentially coupled along the optical path; The incident surface of the waveplate 20 is coupled to the output port of the laser 1, and one beam-splitting surface of the polarizing beam splitter 21 is coupled to the incident surface of the temperature control component 3.

[0008] Preferably, the waveplate 20 is a 1 / 2 waveplate.

[0009] Preferably, it also includes a control module 5, which is electrically connected to the laser 1, the temperature control component 3 and the photodetector 4 respectively.

[0010] Preferably, the control module 5 includes a controller and a host computer; The controller is connected to the current control terminal of the laser 1 and the temperature control terminal of the temperature control component 3, respectively. The host computer is electrically connected to the controller and the photodetector 4, respectively.

[0011] Preferably, the temperature control component 3 includes a temperature control module and a sealed chamber for accommodating the rubidium bulb, and the temperature control module is connected to the control module 5; The sealed bubble chamber containing the rubidium bubble is coupled between the optical adjustment component 2 and the photodetector 4.

[0012] Preferably, the preset low-temperature operating temperature range is 23°-25°.

[0013] Preferably, the laser 1 is a cat's-eye external cavity tunable semiconductor laser.

[0014] Preferably, the wavelength range of the laser signal is 760nm-1560nm.

[0015] In a second aspect, an atomic spectral line analysis apparatus is provided, including the spectral line broadening and modulation device as described in the first aspect.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention first sets the working temperature of the rubidium bulb to a preset low-temperature working temperature using the temperature control component 3, and then manually adjusts the optical adjustment component 2 to adjust the optical power of the laser signal entering the rubidium bulb. Under low-temperature conditions, the intensity of the laser signal is compensated, thereby lowering the lower limit of the effective signal-to-noise ratio spectral line. Finally, it achieves stable and reliable measurement of spectral line data over a wider temperature range from high to low temperatures. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a spectral line broadening modulation device provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the structure of an optical adjustment component provided in an embodiment of the present invention; Figure 3 This is a more detailed structural schematic diagram of a spectral line broadening modulation device provided in this embodiment of the present invention.

[0019] In all the accompanying drawings, the same reference numerals denote the same structure, wherein: Laser 1, optical adjustment assembly 2, waveplate 20, polarizing beam splitter 21, temperature control assembly 3, photodetector 4, control module 5. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as openly inclusive, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples; that is, although they may be incorporated into embodiments or examples using the above terms for reasons such as order and position, it does not limit them to be incorporated in combination by a single embodiment or example.

[0022] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more. Furthermore, for example, the description may use the prefix "A" or "B" to describe the same type of nouns as two independent entities. In this case, the features defined with "A" and "B" are used only to distinguish between similar entities and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0023] In describing some embodiments, the terms "coupled," "coupled," and "connected," and their derivative expressions, may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the terms "connected" or "coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other, such as "optical coupling" or "wireless connection." The embodiments disclosed herein are not necessarily limited to the scope of this invention.

[0024] Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] Example 1: In existing technologies, the activity and quantity of rubidium atoms are positively correlated with temperature. Lowering the temperature directly leads to a decrease in the activity of rubidium atoms and a sharp reduction in the number of atoms effectively participating in spectral interactions. When the temperature is directly lowered to a low level, it triggers a chain of technical problems: first, the interaction intensity between the laser and rubidium atoms is significantly reduced, resulting in extremely weak changes in the light signal received by the photodetector 4; second, the weak light signal is easily masked by background noise, leading to a severe deterioration in the signal-to-noise ratio of the output spectral lines, making it impossible to extract effective spectral line broadening values; even if some data is obtained, the proportion of invalid information is too high to have practical measurement value. Based on the above defects, existing technologies suffer from a technical bottleneck of limited lower temperature adjustment limits, making it impossible to obtain a wider range of spectral line data by further lowering the temperature, thus limiting the applicable scenarios and upper limits of accuracy for rubidium atom spectral line broadening measurements.

[0026] To address the aforementioned problems, this embodiment proposes a spectral line broadening and modulation device for rubidium atom spectral line broadening and modulation. In one embodiment, such as... Figure 1As shown, the spectral line broadening and modulation device includes: a laser 1, an optical adjustment component 2, a temperature control component 3, and a photodetector 4, which are sequentially coupled along the optical path; the laser 1 is used to generate a laser signal; the temperature control component 3 is used to contain the rubidium bulb and adjust the operating temperature of the rubidium bulb; at a preset low operating temperature, the optical adjustment component 2 is manually adjusted to adjust the intensity of the laser signal incident on the rubidium bulb, thereby obtaining stable spectral line data through the photodetector 4.

[0027] In one embodiment, the spectral line broadening and modulation device further includes a control module 5, which is electrically connected to the laser 1, the temperature control component 3, and the photodetector 4.

[0028] The control module 5 is used to configure the current parameters of the laser 1 and the temperature parameters of the temperature control component 3; the laser 1 is used to generate a laser signal according to the current parameters, and the optical adjustment component 2 is used to adjust the intensity of the laser signal; the temperature control component 3 is used to accommodate the rubidium bulb and set the operating temperature of the rubidium bulb according to the temperature parameters; the photodetector 4 is used to detect the light signal obtained after the laser signal passes through the rubidium bulb and generate a detection electrical signal; the control module 5 is also used to acquire corresponding spectral data according to the detection electrical signal.

[0029] Among them, the control module 5, as the core control unit of the entire device, undertakes dual functions. First, the active configuration function, that is, according to the preset measurement requirements, it sends current parameters to the laser 1 and temperature parameters to the temperature control component 3 to achieve precise control of the laser output characteristics and the working temperature of the rubidium bulb; second, the data processing function, that is, it receives the detection electrical signal transmitted by the photodetector 4, and analyzes and obtains the corresponding rubidium atomic spectral line data based on the detection electrical signal, completing the conversion from electrical signal to spectral line information.

[0030] The laser 1, acting as the laser signal source, operates entirely under the control of the current parameters issued by the control module 5, enabling it to output laser signals of specific intensity and frequency based on changes in the current parameters. In one embodiment, the laser 1 is a cat-eye external cavity tunable semiconductor laser. Furthermore, the wavelength range of the laser signal is 760nm-1560nm. Specifically, the wavelength of the laser signal can be 760nm, 1560nm, or any wavelength between 760nm and 1560nm.

[0031] The optical adjustment component 2 is located between the laser 1 and the temperature control component 3. Its core function is to adjust the intensity of the laser signal output by the laser 1, ensuring that the intensity of the laser signal incident on the rubidium bulb in the temperature control component 3 is within the optimal range, and avoiding the subsequent spectral interaction effect due to excessively high or low laser intensity.

[0032] The temperature control component 3, as the core carrier containing the rubidium bulb, has the core function of precisely adjusting and maintaining the working temperature of the rubidium bulb according to the temperature parameters issued by the control module 5. Through controllable temperature parameter configuration, it can achieve a wide range of temperature adjustment while ensuring that rubidium atoms have sufficient activity and quantity at different temperatures, ensuring effective interaction between the laser and rubidium atoms. In one embodiment, the preset low-temperature working temperature range is 23°-25°. However, the preset low-temperature working temperature can be 23°, 25°, or any degree between 23° and 25°.

[0033] The photodetector 4 is located at the signal output end of the temperature control component 3. Its function is to receive the laser signal after it has passed through the rubidium bulb and convert the optical signal into a detection electrical signal that can be recognized by the control module 5, so as to provide raw data support for the subsequent acquisition of spectral data.

[0034] In one embodiment, the specific workflow of the spectral line broadening modulation device includes: The control module 5 controls the laser 1 to output a laser signal by sending current parameters. The optical adjustment component 2 preprocesses the intensity of the laser signal and then directs it into the rubidium bulb in the temperature control component 3. The temperature control component 3 maintains the optimal operating temperature of the rubidium bulb according to the temperature parameters to ensure the effective interaction between rubidium atoms and the laser. After the laser signal is processed by the rubidium atoms, it is converted into a detection electrical signal by the photodetector 4 and fed back to the control module 5. The control module 5 finally analyzes and obtains the spectral data. By adjusting the intensity of the laser signal through the optical adjustment component 2, the lower limit of temperature adjustment in the existing technology is broken, and a wider range of spectral data can be acquired.

[0035] In summary, the advantages of this embodiment include: abandoning the logic of high-temperature modulation to low-temperature modulation without changing other parameters in the prior art, and making up for the weak signal caused by insufficient number of rubidium atoms at low temperature by first setting the low temperature and then adjusting the intensity of the laser signal, effectively reducing the lowest measurable temperature and expanding the measurement range of spectral broadening.

[0036] In order to adjust the optical power of the laser signal, in one embodiment, such as Figure 2 As shown, the optical adjustment component 2 includes a waveplate 20 and a polarizing beam splitter 21 coupled sequentially along the optical path; the light-incident surface of the waveplate 20 is coupled to the light-out port of the laser 1, and one beam-splitting surface of the polarizing beam splitter 21 is coupled to the light-incident surface of the temperature control component 3.

[0037] The waveplate 20 is a half-waveplate. The half-waveplate is a polarization modulation element that changes the polarization direction of the incident laser signal. When the linearly polarized laser output from laser 1 is incident on the half-waveplate, rotating the angle of the half-waveplate allows for continuous adjustment of the laser's polarization direction within a range of 0°-180°, thereby changing the polarization state of the laser subsequently incident on the polarization beam splitter 21.

[0038] The core function of the polarization beam splitter 21 is to distribute and adjust the optical power according to the polarization direction of the laser. For incident linearly polarized laser, the polarization beam splitter 21 will decompose it into ordinary light (o light) and extraordinary light (e light). One beam is transmitted along the original optical path, while the other beam is reflected perpendicular to the optical path. The ratio of the optical power of the two beams is determined by the polarization direction of the incident laser.

[0039] Considering the half-wave plate at the front end, when the half-wave plate is manually rotated to change the laser polarization direction, the polarization state of the laser incident on the polarization beam splitter 21 changes synchronously, resulting in a continuously adjustable change in the proportion of transmitted light power. By controlling the rotation angle of the half-wave plate, the intensity of the laser signal transmitted to the temperature control component 3 can be precisely controlled, ensuring that the laser power incident on the rubidium bulb is within the optimal range for interaction with rubidium atoms, avoiding problems such as saturation excitation of rubidium atoms due to excessive laser power or insufficient signal intensity due to insufficient power.

[0040] In one embodiment, the control module 5 includes a controller and a host computer; the controller is connected to the current control terminal of the laser 1 and the temperature control terminal of the temperature control component 3, respectively. The host computer is electrically connected to both the controller and the photodetector 4. The controller is used to control the current parameters of the laser 1 and the temperature parameters of the temperature control component 3; the host computer is electrically connected to both the controller and the photodetector 4; the host computer is used to send control commands to the controller and to receive and process the detection electrical signals collected by the photodetector 4 to obtain spectral data.

[0041] In one embodiment, the host computer is equipped with control software, which is used to set temperature control commands and laser 1 current control commands, and send them to laser 1 and temperature control component 3 through the controller.

[0042] The controller, as the underlying execution unit, establishes an electrical connection between its signal input terminal and the host computer to receive control commands issued by the host computer; its signal output terminal is connected to the current control terminal of the laser 1 and the temperature control terminal of the temperature control component 3 respectively, and directly undertakes the task of precise regulation of the current parameters of the laser 1 and the temperature parameters of the temperature control component 3.

[0043] The host computer, as the top-level control and data processing unit, has bidirectional signal interaction capability. On the one hand, it is electrically connected to the controller and sends temperature control commands and laser 1 current control commands downward, thus guiding the entire device's workflow. On the other hand, it is electrically connected to the photodetector 4 and receives the detection electrical signals collected by the photodetector 4, analyzes and processes the electrical signals, and finally obtains the spectral data of rubidium atoms, completing the conversion from raw electrical signals to effective measurement data.

[0044] In one embodiment, the control software provides a human-machine interface, allowing operators to pre-set temperature control commands and laser 1 current control commands according to the measurement requirements of rubidium atomic spectral line broadening. The commands include specific temperature thresholds, current parameter ranges, and other key control parameters, ensuring the accuracy and specificity of the commands. The control software converts the set control commands into electrical signals recognizable by the controller and sends them to the controller via the connection link between the host computer and the controller, realizing the transmission of top-level commands to the bottom-level execution units.

[0045] While the controller executes instructions and regulates the operation of laser 1 and temperature control component 3, the host computer receives the detection electrical signal in real time through the connection with photodetector 4. The control software has a built-in data processing algorithm to perform noise reduction, filtering, feature extraction and other processing on the electrical signal, and finally generates the corresponding spectral data, completing the whole process control of parameter setting, equipment regulation, signal acquisition and data generation.

[0046] It is worth noting that the configuration method and workflow of the above-mentioned control software are existing technologies, and the specific implementation process will not be described in detail in this embodiment.

[0047] In one embodiment, the temperature control component 3 includes a temperature control module and a sealed chamber for accommodating the rubidium bulb. The temperature control module is connected to the control module 5. The sealed chamber for accommodating the rubidium bulb is coupled between the optical adjustment component 2 and the photodetector 4 so that the laser signal passes through the rubidium bulb and is detected by the photodetector 4.

[0048] The core function of the sealed bubble chamber is to provide a stable space for the rubidium bulb, ensuring that the rubidium bulb is fixed in position during the measurement process and avoiding optical path deviation due to displacement. The temperature control module is used to receive temperature parameter commands from the control module 5, and then to accurately adjust and maintain the temperature inside the sealed bubble chamber, ensuring that the rubidium bulb is in the preset working temperature environment.

[0049] In one embodiment, the light-incident side of the sealed bubble chamber is coupled to the light-outcident end of the optical adjustment component 2, and the light-outcident side is coupled to the light-incident end of the photodetector 4, forming an optical path link of laser 1 → optical adjustment component 2 → sealed bubble chamber (containing rubidium bubble) → photodetector 4. This ensures that the laser signal adjusted by the optical adjustment component 2 can completely pass through the rubidium bubble and fully interact with the rubidium atoms in the rubidium bubble. The laser signal after the interaction is then directly incident on the photodetector 4.

[0050] Here, in conjunction with all the structures listed above, in one embodiment, such as Figure 3 As shown, the workflow of the spectral line broadening modulation device further includes: setting temperature parameters and current parameters of laser 1 through a host computer; the controller outputs corresponding instructions to laser 1 and temperature control module; the current parameters control the laser signal output by laser 1 at the required wavelength and frequency; the laser signal then passes through a half-wave plate, a polarizing beam splitter, and a sealed bubble chamber before entering the photodetector 4; and the signal is then fed back to the host computer. The host computer obtains the triangular wave spectrum through software; the signal-to-noise ratio of the spectral line is improved at low temperature by manually adjusting the half-wave plate; and the spectral line broadening is obtained by fitting using a formula algorithm. The better the signal-to-noise ratio of the spectral line, the more stable and accurate the fitted value.

[0051] In summary, this embodiment first sets the working temperature of the rubidium bulb to a preset low-temperature working temperature using the temperature control component 3, and then manually adjusts the optical adjustment component 2 to adjust the optical power of the laser signal entering the rubidium bulb. Under low-temperature conditions, the intensity of the laser signal is compensated, thereby lowering the lower limit of the effective signal-to-noise ratio spectral line. Finally, stable and reliable spectral line data measurement is achieved over a wider temperature range from high to low temperatures.

[0052] Example 2: This embodiment proposes an atomic spectral line analysis device, including the spectral line broadening and modulation device as described in Embodiment 1.

[0053] In this embodiment, the working temperature of the rubidium bulb is first set to a preset low-temperature working temperature by the temperature control component 3. Then, the optical adjustment component 2 is manually adjusted to adjust the optical power of the laser signal entering the rubidium bulb. The intensity of the laser signal is compensated under low-temperature conditions, thereby pushing down the lower limit of the effective signal-to-noise ratio spectral line. Finally, stable and reliable spectral line data measurement is achieved in a wider temperature range from high temperature to lower temperature.

[0054] For the specific structure of the spectral line broadening modulation device, please refer to Embodiment 1. It will not be described in detail in this embodiment.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A spectral line broadening and modulation device for rubidium atom spectral line broadening and modulation, characterized in that, include: A laser (1), an optical adjustment assembly (2), a temperature control assembly (3), and a photodetector (4) are sequentially coupled along the optical path. The laser (1) is used to generate laser signals; The temperature control component (3) is used to accommodate the rubidium bulb and regulate its operating temperature. At a preset low operating temperature, the optical adjustment component (2) is manually adjusted to adjust the intensity of the laser signal injected into the rubidium bulb, thereby obtaining stable spectral data through the photodetector (4).

2. The spectral line broadening and modulation device according to claim 1, characterized in that, The optical adjustment assembly (2) includes a waveplate (20) and a polarizing beam splitter (21) coupled sequentially along the optical path. The incident surface of the waveplate (20) is coupled to the output port of the laser (1), and one beam splitting surface of the polarizing beam splitter (21) is coupled to the incident surface of the temperature control component (3).

3. The spectral line broadening and modulation device according to claim 2, characterized in that, The waveplate (20) is a 1 / 2 waveplate.

4. The spectral line broadening and modulation device according to claim 1, characterized in that, It also includes a control module (5), which is electrically connected to the laser (1), the temperature control component (3) and the photodetector (4).

5. The spectral line broadening and modulation device according to claim 4, characterized in that, The control module (5) includes a controller and a host computer; The controller is connected to the current control terminal of the laser (1) and the temperature control terminal of the temperature control component (3), respectively. The host computer is electrically connected to the controller and the photodetector (4) respectively.

6. The spectral line broadening and modulation device according to claim 4, characterized in that, The temperature control component (3) includes a temperature control module and a sealed bubble chamber for accommodating the rubidium bubble, and the temperature control module is connected to the control module (5); The sealed bubble chamber containing the rubidium bubble is coupled between the optical adjustment assembly (2) and the photodetector (4).

7. The spectral line broadening and modulation device according to claim 1, characterized in that, The preset low-temperature operating temperature range is 23°-25°.

8. The spectral line broadening and modulation device according to claim 1, characterized in that, The laser (1) is a cat-eye type external cavity tunable semiconductor laser.

9. The spectral line broadening and modulation device according to claim 1, characterized in that, The wavelength range of the laser signal is 760nm-1560nm.

10. An atomic spectral analysis device, characterized in that, Includes the spectral line broadening modulation device as described in any one of claims 1-9.

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