Method and device for generating nitrogen-assisted bidirectional two-color cascaded argon laser

Abstract

The application discloses a nitrogen-assisted bidirectional double-color argon laser generation method and device, and belongs to the technical field of ultrafast lasers. 12 W / cm 2 The method comprises the following steps: focusing linearly polarized pulse pumping light with a central wavelength of 261±1 nm in a mixed gas containing nitrogen and argon, and the corresponding peak power density is greater than 10 The method is simple, only needs to generate specific pumping light and focus the pumping light in the mixed gas containing nitrogen and argon, and then bidirectional double-color cascade argon laser can be obtained, for example, the air can be directly excited to generate argon-air laser, and the method is simple and widely applicable.

Description

Technical Field

[0001] This invention belongs to the field of ultrafast laser technology, and more specifically, relates to a method and apparatus for generating a nitrogen-assisted bidirectional dual-color cascaded argon laser. Background Technology

[0002] In recent years, researchers have used certain components present in the air as gain media to generate free-space radiation with good directionality and coherence in an open atmospheric environment without a resonant cavity. This is called air laser, and its physical essence belongs to superradiation (superfluorescence), that is, collective spontaneous emission generated when multiple atoms interact with light. To date, generating air lasers in an atmospheric environment remains challenging. Although experiments have reported the generation of air lasers through three-photon excitation of argon atoms (Ar), some problems still exist. For example, A. Dogariu et al. generated argon lasers at 1327 nm and 1409 nm in 2016 and 2018, respectively, through three-photon excitation of pure argon gas and argon atoms (Ar) in air (see A. Dogariu et al., Three-photon femtosecond pumped backwards lasing in argon. Opt. Express 24, A544 (2016). and A. Dogariu et al., Backwards Lasing in Atmospheric Air from Argon. in Conference on Lasers and Electro-Optics JTh5B.8 (OSA, 2018).). However, these two works only achieved monochromatic argon lasers and did not excite dual-color cascaded argon lasers. Summary of the Invention

[0003] In view of the above-mentioned defects or improvement needs of the prior art, the present invention provides a method and apparatus for generating a nitrogen-assisted bidirectional dual-color cascaded argon laser. The purpose is to enhance the three-photon excitation of argon atoms through the assistance of nitrogen to generate a bidirectional dual-color cascaded argon laser and improve its applicability.

[0004] To achieve the above objectives, according to one aspect of the present invention, a method for generating a nitrogen-assisted bidirectional dual-color cascaded argon laser is provided, comprising:

[0005] When linearly polarized high-pulse pump light with a center wavelength of 261±1nm is focused onto a mixed gas including nitrogen and argon, the corresponding peak power density is greater than 10. 12 W / cm 2It generates a dual-color cascaded argon laser with forward and backward bidirectional transmission wavelengths of 1409.4nm and 755nm, wherein the ratio of nitrogen to argon in the mixed gas is not less than 20:1.

[0006] In one embodiment, the ratio of nitrogen to argon in the mixed gas is adjustable, and the intensity of the dual-color argon laser is adjusted by adjusting the ratio of nitrogen to argon.

[0007] In one embodiment, the mixed gas is air, and the linearly polarized pulsed pump light is focused in the air to generate an argon-air laser.

[0008] According to another aspect of the present invention, a nitrogen-assisted bidirectional dual-color cascaded argon laser device is provided, comprising:

[0009] Laser used to generate a center wavelength of 261±1nm with a peak power density greater than 10 12 W / cm 2 Linearly polarized pulsed pump light;

[0010] The first focusing lens is used to focus the linearly polarized pulse pump light onto a mixed gas containing nitrogen and argon with a ratio of nitrogen to argon of not less than 20:1, so as to generate a bidirectional cascaded argon laser with wavelengths of 1409.4 nm and 755 nm that propagates in both forward and backward directions.

[0011] A beam separation component is used to separate the linearly polarized pulse pump light from the generated bidirectional dual-color cascaded argon laser.

[0012] In one embodiment, the beam splitting component is a dichroic mirror that can reflect the linearly polarized pulse pump light and transmit the two-color argon laser.

[0013] In one embodiment, the device is provided with beam separation components located on the back side and the front side;

[0014] The linearly polarized pulse pump light generated by the laser is focused in the mixed gas after being converged by the first focusing lens and reflected by the beam splitter on the back side to generate a dual-color argon laser with wavelengths of 1409.4 nm and 755 nm. The dual-color argon laser is emitted in the forward and backward directions, respectively. The backward direction is the side facing the beam splitter on the back side, and the forward direction is opposite to the backward direction. The dual-color cascaded argon lasers on the back and forward sides are received after being transmitted through the beam splitter on the back and forward sides, respectively.

[0015] In one embodiment, it further includes:

[0016] The first and second spectrometers are used to receive the back-facing and front-facing dual-color cascaded argon laser.

[0017] In one embodiment, it further includes: a light-blocking plate located behind the beam separation assembly on the front side;

[0018] The forward dual-color cascaded argon laser is received after passing through the beam splitter on the positive side, and the linearly polarized pulse pump light is reflected by the beam splitter on the positive side to the light-blocking plate.

[0019] In one embodiment, a sealed gas chamber is further included, the sealed gas chamber containing a mixture of nitrogen and argon, the linearly polarized pulse pump light being focused within the mixture of gas in the sealed gas chamber to excite the dual-color cascaded argon laser, the ratio of nitrogen to argon in the mixture of gas being not less than 20:1.

[0020] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects:

[0021] The nitrogen-assisted bidirectional dual-color argon laser generation method proposed in this invention uses a center wavelength of 261±1nm, which is focused in a mixed gas containing nitrogen and argon, at which point the peak power density is greater than 10. 12 W / cm 2 Experiments show that when the ratio of nitrogen to argon in the above-mentioned mixed gas is not less than 20:1, the focused linearly polarized pulse pump light can excite the argon in the mixed gas to generate a bidirectional, two-color cascaded laser with wavelengths of 1409.4 nm and 751.5 nm. The method of this invention is simple; it only requires generating a specific pump light and focusing it on the mixed gas to obtain a bidirectional, two-color cascaded argon laser. Furthermore, the gas environment used in this invention is a mixed gas, eliminating the need to construct a pure argon environment, thus broadening the applicability of the gas. For example, air can be directly excited, or other mixed gas environments containing nitrogen and argon can be used to generate argon lasers, expanding the application range.

[0022] The nitrogen-assisted bidirectional dual-color argon laser device proposed in this invention includes a laser, a first focusing lens, and a beam splitting assembly. Using only these three components, it can generate specific linearly polarized pulsed pump light. This pump light excites a mixture of nitrogen and argon in a nitrogen-argon ratio of at least 20:1 to produce bidirectional dual-color argon lasers at 1409.4 nm and 751.5 nm. By using this simple device and applying the generated pump light to the aforementioned gas mixture, a bidirectional dual-color cascaded argon laser can be generated. The device has a simple structure and wide applicability.

[0023] Furthermore, the present invention has also discovered through experiments that the intensity of the dual-color argon laser can be adjusted by regulating the ratio of nitrogen to argon. Therefore, in some mixed gas environments with adjustable gas content, the ratio of nitrogen to argon in the mixed gas can be adjusted according to actual needs to regulate the intensity of the dual-color argon laser, thus providing greater flexibility.

[0024] Furthermore, the mixed gas can be directly air, eliminating the need for a specially constructed mixed gas environment, making the generation of bidirectional, dual-color argon lasers much simpler, thus achieving a true "air laser." Air lasers can be widely used in applications such as remote sensing of atmospheric trace pollutants, greenhouse gas detection, combustion diagnostics, remote detection of explosives, and early warning of nuclear leaks, demonstrating a broad range of applications. Attached Figure Description

[0025] Figure 1 This is a flowchart of the steps of a nitrogen-assisted bidirectional dual-color cascaded argon laser generation method in one embodiment;

[0026] Figure 2 This is a schematic diagram illustrating the principle of generating a bidirectional, two-color cascaded argon laser in pure argon gas.

[0027] Figure 3 This is a schematic diagram illustrating the principle of generating a bidirectional, dual-color cascaded argon laser in an argon-nitrogen mixed gas according to the present invention.

[0028] Figure 4 This is a schematic diagram of a bidirectional dual-color argon laser device with an adjustable nitrogen-argon mixing ratio in one embodiment.

[0029] Figure 5 This is a schematic diagram of the structure of a bidirectional dual-color argon-air laser device in one embodiment;

[0030] Figure 6 These are the spectra of the bidirectional dual-color cascaded argon-air laser obtained by the present invention, wherein (a) is a schematic diagram of the spectrum of the 751.5nm argon-air laser and (b) is a schematic diagram of the spectrum of the 1409.4nm argon-air laser. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention 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 and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other. Embodiment 1

[0032] This embodiment discloses a method for generating a nitrogen-assisted bidirectional dual-color argon laser, such as... Figure 1 As shown, it mainly includes the following steps:

[0033] Step S1: Generate a center wavelength of 261±1nm with a peak power density greater than 10. 12 W / cm 2 Linearly polarized pulsed pump light.

[0034] Specifically, a laser can be used, and the frequency of the laser can be adjusted to obtain the required pulsed pump light. For example, a commercial femtosecond Ti:sapphire laser (Spectra-Physics Solstice ACE) can be used, with an output center wavelength adjustable in the range of 780-800nm. Through third harmonic generation or optical parametric amplification and sum-frequency generation, linearly polarized pulsed pump light with a center wavelength of 261±1nm can be generated.

[0035] Step S2: Focus the linearly polarized pulse pump light in a mixed gas containing nitrogen and argon to generate a bidirectional cascaded argon laser with wavelengths of 1409.4 nm and 751.5 nm, propagating in both forward and backward directions. The ratio of nitrogen to argon in the mixed gas is not less than 20:1.

[0036] Specifically, a focusing lens can be used to focus the linearly polarized pulse pump light in the mixed gas to excite the mixed gas to generate a bidirectional, dual-color cascaded argon laser with wavelengths of 1409.4 nm and 751.5 nm. The mixed gas contains argon and nitrogen, with nitrogen used to assist the dual-color argon laser.

[0037] The principle of exciting a two-color cascaded argon laser is explained below.

[0038] like Figure 2 The diagram illustrates the principle of generating a two-color cascaded argon laser in pure argon gas. In pure argon gas, a pump light of approximately 261 nm, after being focused, can move argon atoms from their ground state 3p... 1 The S0 three-photon excitation is directed to the excited state 3d'[5 / 2]3, and then transitions to the 4p'[3 / 2]2 state via cascaded superfluorescence, emitting superfluorescence at 1327.3 nm. It then transitions to the 4s'[1 / 2]1 state, emitting superfluorescence at 840.8 nm. This is the path 1 for generating a two-color cascaded argon laser.

[0039] This invention discovers that by changing the gas environment and adding a certain amount of nitrogen to argon, path 1 will switch to path 2 (e.g., Figure 3 As shown in the diagram, that is, the argon atom changes from its ground state 3p... 1 The S0 three-photon excitation reaches the excited state 3d[3 / 2]1, and then transitions to the 4p[1 / 2]0 state via cascaded superfluorescence, emitting superfluorescence at 1409.4 nm, before transitioning to the 4s[3 / 2]1 state, emitting superfluorescence at 751.5 nm. The reason for this phenomenon, as analyzed in this invention, may be:

[0040] When excited by pump light, the excitation of argon atoms can occur simultaneously via both path 1 and path 2. According to the selection rule, in path 1, the argon atom absorbs three fundamental photons (ΔJ = 1 + 1 + 1 = 3), and the argon atom transitions from the ground state 3p. 1 S0 is excited to the excited state 3d'[5 / 2]3 by three photons. In path 2, the argon atom is allowed to absorb three fundamental photons simultaneously (ΔJ = 1 + 1 - 1 = 1) or absorb one third harmonic photon (the third harmonic photon generated by the interaction of the pump light with the gas). In a pure argon environment, the absorption of the fundamental photon and the absorption of the third harmonic photon in path 2 are out of phase and interfere with each other to cancel each other out. Therefore, path 2 is essentially closed in pure argon, and only the result of path 1 is observed.

[0041] After adding a certain amount of nitrogen, the introduction of nitrogen causes path 1 to switch to path 2. This is due to the nitrogen's... The energy levels of the nitrogen gas state are very close to those of the 3d[3 / 2]1 state of argon (<2.6 meV), therefore the 261 nm pump light can excite nitrogen gas to its maximum energy level using three photons. In this state, the third harmonic photons generated by the interaction between the pump light and the gas are located in the single-photon resonance region of nitrogen and argon. The refractive index of the third harmonic changes drastically near the single-photon absorption peak. Therefore, under the condition that n(3ω)=n(ω), phase matching and enhancement of the third harmonic can be achieved. This breaks the balance of interference cancellation between the single-photon absorption of the third harmonic and the three-photon absorption of the fundamental frequency light, thus opening path 2. Moreover, as the proportion of nitrogen component increases, the argon atom energy level 3d'[5 / 2]3 is more easily dissipated by collisions with surrounding nitrogen molecules, thus destroying path 1. Finally, under near-normal atmospheric conditions or in air, the result of path 2 is observed, and path 1 is closed. Thus, a bidirectional two-color cascaded argon laser with a different wavelength than that in pure argon gas is observed.

[0042] In one embodiment, the composition of the mixed gas can also be artificially adjusted. For example, a mixed gas containing nitrogen and argon can be filled into a sealed environment. The intensity of the bidirectional dual-color cascaded argon laser can be adjusted by regulating the ratio of nitrogen to argon. The ratio of nitrogen to argon in the mixed gas is not less than 20:1. As the ratio of nitrogen to argon increases, the bidirectional dual-color cascaded argon laser at 1409.4 nm and 751.5 nm is enhanced. Preferably, only nitrogen and argon can be used to form the mixed gas.

[0043] In one embodiment, the mixed gas can be directly selected as air. The ratio of nitrogen to argon in the air is close to 80:1, which meets the requirements of the mixed gas of the present invention. Using pump light to directly excite air to generate a true air laser is a simple method, and air lasers can be widely used in applications such as remote sensing of atmospheric trace pollutants, greenhouse gas detection, combustion diagnostics, remote detection of explosives, and early warning of nuclear leaks, with a wide range of applications.

[0044] Understandably, the mixed gas is not necessarily limited to air. In one embodiment, under certain special environments, the choice can be made according to the actual scenario. As long as the ratio of nitrogen to argon in the mixed gas containing nitrogen and argon is not less than 20:1, the bidirectional dual-color cascaded argon laser of this invention can be generated.

[0045] Example 2

[0046] This embodiment discloses a bidirectional, dual-color argon laser device with an adjustable nitrogen-argon mixing ratio, such as... Figure 4 As shown, the device includes at least a laser, a first focusing lens 1, and a beam splitting assembly. The laser is used to generate a beam with a center wavelength of 261±1 nm and a peak power density greater than 10. 12 W / cm 2 The linearly polarized pulsed pump light is focused into a mixed gas with a nitrogen-argon ratio of at least 20:1, generating a bidirectional, two-color cascaded argon laser with wavelengths of 1409.4 nm and 751.5 nm. A beam splitter is used to separate the linearly polarized pulsed pump light from the generated two-color argon laser beam. The pump light, focused into the mixed gas by the focusing lens, generates a two-color cascaded argon laser. Since the two-color cascaded argon laser is emitted in two directions—forward (the same direction as the pump light emission in the mixed gas) and backward (the same direction as the pump light emission in the mixed gas)—the pump light and the generated two-color cascaded argon laser propagate collinearly. Therefore, to successfully receive the bidirectional, two-color cascaded argon laser, a beam splitter is used to separate the desired bidirectional, two-color cascaded argon laser from the mixed beam.

[0047] In one embodiment, the 261nm laser can be generated in various ways, such as by tripling the output of a Ti:sapphire laser or by optical parametric amplification and frequency summation.

[0048] In one embodiment, the beam splitting component is a dichroic mirror that can reflect linearly polarized pulsed pump light and transmit a dual-color argon laser. The mixed light reaches the dichroic mirror, where one type of light is directly transmitted through the mirror, while the other is emitted, thereby achieving beam splitting.

[0049] In one embodiment, reference Figure 4As shown, the device is equipped with a beam splitter 4 located on the back side. The pump light generated by the laser is focused in the mixed gas after being converged by the first focusing lens 1 and reflected by the beam splitter 4 located on the back side to excite and generate a dual-color cascaded argon laser with wavelengths of 1409.4nm and 751.5nm. The dual-color cascaded argon laser is emitted in the forward and backward directions respectively. The backward dual-color argon laser is received after being transmitted through the beam splitter 4 located on the back side, and the forward dual-color argon laser is received after being transmitted through the beam splitter 5 located on the front side.

[0050] In one embodiment, the device further includes a first spectrometer 2 and a second spectrometer 7 on the back and front sides, respectively, for receiving the back-facing and front-facing dual-color argon lasers. Furthermore, a second focusing lens 3 and a third focusing lens 6 can be respectively disposed in front of the first spectrometer 2 and the second spectrometer 7. The back-facing dual-color argon laser is focused by the second focusing lens 3 and then received by the first spectrometer 2, while the front-facing dual-color argon laser is focused by the third focusing lens 6 and then received by the second spectrometer 7.

[0051] In other cases, such as Figure 4 As shown, a light-blocking plate 8 can also be set on the front side as needed. The linearly polarized pulse pump light is reflected by the beam separation component 5 located on the front side to the light-blocking plate 8 to avoid light pollution.

[0052] In one embodiment, the device directly acts on a mixed gas with a nitrogen-argon ratio of not less than 20:1, that is, the first focusing lens is used to focus the linearly polarized pulse pump light in the above-mentioned mixed gas to generate a dual-color cascaded argon laser with wavelengths of 1409.4nm and 751.5nm.

[0053] It is understood that the mixed gas is not necessarily limited to a nitrogen-argon mixture; it can also be other mixed gases containing nitrogen and argon, such as air. In one embodiment, under certain special environments, the choice can be made according to the actual scenario. As long as it contains nitrogen and argon and the ratio of nitrogen to argon is not less than 20:1, the bidirectional dual-color argon laser of this invention can be generated.

[0054] In one specific embodiment, the operation mode of the above device includes (refer to...) Figure 4 ):

[0055] 1. Turn on the water cooling device, then turn on the laser. After the output stabilizes, obtain a short pulse (femtosecond to nanosecond) pump light of 261nm by frequency triple or optical parametric amplification and frequency summation.

[0056] 2. A certain amount of nitrogen and argon are filled into the gas chamber, with the ratio of nitrogen to argon not less than 20:1.

[0057] 3. The 261nm pump light is focused by the first focusing lens 1 to generate argon laser at the focal point. The forward argon laser passes through the beam separation component 5 located on the front side and the third focusing lens 6 and finally enters the second spectrometer 7. The backward argon laser passes through the beam separation component 4 located on the back side and the second focusing lens 3 and finally enters the first spectrometer 2.

[0058] 4. Both spectrometers 2 and 7 can collect spectral information from visible to near-infrared light. After multiple acquisitions and averaging of this signal, a dual-color cascaded back-facing and forward-facing argon laser signal at 1409.4 nm and 751.5 nm can be observed on the spectrometer. Record the nitrogen-argon mixing ratio, the wavelength of the argon laser signal, and the corresponding spectral intensity at this time.

[0059] 5. Adjust the ratio of nitrogen to argon and repeat steps 2-4. It can be seen that when the nitrogen-argon ratio is greater than 20:1, the argon laser at 1409.4nm and 751.5nm gradually generates and intensifies as the nitrogen-argon ratio increases.

[0060] By combining the above steps, a bidirectional dual-color cascaded argon laser with a nitrogen-argon ratio greater than 20:1 can be observed in a mixed gas. The laser's intensity increases with the increase of the nitrogen-argon ratio.

[0061] Example 3

[0062] Unlike Example 2, the composition of the mixed gas in this example is not limited to a nitrogen-argon mixture; it can also be other mixed gases containing nitrogen and argon with a nitrogen-argon ratio of not less than 20:1, such as air. Figure 5 The diagram shows a device for a bidirectional, dual-color argon-air laser. By directly exciting air with a nitrogen-argon ratio of 80:1, a bidirectional, dual-color cascaded argon laser with wavelengths of 1409.4 nm and 751.5 nm is generated, which is the argon-air laser.

[0063] In this embodiment, the process of generating a bidirectional, two-color argon-air laser by directly exciting air includes:

[0064] 6. Figure 4 The removal of the gas chamber in the device architecture shown constitutes, as Figure 5 The device architecture shown.

[0065] 7. Repeat steps 3 and 4, allowing spectrometers 2 and 7 to detect the argon-air laser in the opposite and forward directions. Record the wavelengths and corresponding spectral intensities of the argon-air laser signals. A bidirectional, two-color cascaded argon-air laser at 1409.4 nm and 751.5 nm can be observed.

[0066] like Figure 6As shown, (a) is the spectrum of a 751.5 nm argon-air laser, and (b) is the spectrum of a 1409.4 nm argon-air laser.

[0067] In summary, this invention employs a center wavelength of 261±1nm and a peak power density greater than 10. 12 W / cm 2 The linearly polarized pulsed pump light is focused within a gas mixture containing nitrogen and argon in a ratio of at least 20:1, enabling the argon gas in the mixture to generate a bidirectional, dual-color cascaded argon laser with wavelengths of 1409.4 nm and 751.5 nm. This invention is simple, requiring no pure argon environment; the gas mixture only needs to contain nitrogen and argon in a ratio of at least 20:1. It is applicable to a wider range of gases, such as air, or other gas mixtures containing nitrogen and argon, thus broadening its application scope.

[0068] Those skilled in the art will readily understand that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for generating a nitrogen-assisted bidirectional dual-color cascaded argon laser, characterized in that, include: With the center wavelength as Linearly polarized pulsed pump light is focused onto a mixture of nitrogen and argon gases, resulting in a peak power density greater than [value missing]. The generated wavelength is and A bidirectional, forward and backward bidirectional cascaded argon laser, wherein the ratio of nitrogen to argon in the mixed gas is not less than 20:

1.

2. The method for generating a nitrogen-assisted bidirectional dual-color cascaded argon laser as described in claim 1, characterized in that, The ratio of nitrogen to argon in the mixed gas is adjustable, and the intensity of the dual-color cascaded argon laser can be adjusted by regulating the ratio of nitrogen to argon.

3. The method for generating a nitrogen-assisted bidirectional dual-color cascaded argon laser as described in claim 1, characterized in that, The mixed gas is air, and the linearly polarized pulse pump light is focused in the air to generate an argon-air laser.

4. A nitrogen-assisted bidirectional dual-color cascaded argon laser device, characterized in that, include: Laser, used to generate a center wavelength of Peak power density greater than Linearly polarized pulsed pump light; The first focusing lens is used to focus the linearly polarized pulse pump light onto a mixed gas containing nitrogen and argon in a ratio of not less than 20:1, to produce a wavelength of... and A bidirectional, forward and backward bidirectional transmission dual-color cascaded argon laser; A beam separation component is used to separate the linearly polarized pulse pump light from the generated bidirectional dual-color cascaded argon laser.

5. The nitrogen-assisted bidirectional dual-color cascaded argon laser device as described in claim 4, characterized in that, The beam splitting component is a dichroic mirror that can reflect the linearly polarized pulse pump light and transmit the two-color cascaded argon laser.

6. The nitrogen-assisted bidirectional dual-color cascaded argon laser device as described in claim 5, characterized in that, The device is equipped with beam separation components located on the back side and the front side; The linearly polarized pulse pump light generated by the laser is focused in the mixed gas after being converged by the first focusing lens and reflected by the beam splitter located on the back side, thereby exciting the generation of wavelength [missing information]. and The dual-color cascaded argon laser is emitted in a forward and backward direction, respectively. The backward direction is the side facing the beam separation component located on the back side, and the forward direction is opposite to the backward direction. The dual-color cascaded argon laser emitted in the backward and forward directions is received after passing through the beam separation component located on the back and forward sides, respectively.

7. The nitrogen-assisted bidirectional dual-color cascaded argon laser device as described in claim 6, characterized in that, Also includes: The first and second spectrometers are used to receive the back-facing and front-facing dual-color cascaded argon laser.

8. The nitrogen-assisted bidirectional dual-color cascaded argon laser device as described in claim 6 or 7, characterized in that, Also includes: A light-blocking plate located behind the beam splitter assembly on the front side; The forward dual-color cascaded argon laser is received after passing through the beam splitter on the positive side, and the linearly polarized pulse pump light is reflected by the beam splitter on the positive side to the light-blocking plate.

9. The nitrogen-assisted bidirectional dual-color cascaded argon laser device as described in claim 5, characterized in that, It also includes a sealed gas chamber containing a mixture of nitrogen and argon, wherein the linearly polarized pulse pump light is focused within the mixture of gas in the sealed gas chamber to excite the dual-color cascaded argon laser, and the ratio of nitrogen to argon in the mixture is not less than 20:1.

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