Semiconductor-pumped diamond Raman laser spectrometer / timer synthesis device

Abstract

The application provides a semiconductor-pumped diamond Raman laser spectrum / time sequence synthesis device, which comprises at least one semiconductor pumping source, at least one diamond Raman medium, a resonant cavity, a beam combination module and a signal feedback adjustment module. According to the maximum wavelength resolution difference, i.e. the Raman laser wavelength difference, of the beam combination module and the maximum tuning wavelength difference of the semiconductor pumping source, the semiconductor-pumped diamond Raman laser spectrum / time sequence synthesis device controls the semiconductor pumping source laser wavelength and the Raman laser wavelength generated by the diamond Raman medium through the signal feedback adjustment module, so that the adjacent diamond Raman laser wavelength difference meets the optimal beam combination condition of the beam combination module, and the laser spectrum / time sequence synthesis technology is provided with a light source with a narrow linewidth, a high beam quality and a large wavelength tuning range, so that a high-power and high-beam-quality synthesized spectrum is obtained.

Description

Technical Field

[0001] This invention relates to the field of solid-state laser technology, and in particular to a semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device. Background Technology

[0002] In existing laser spectral / temporal synthesis technologies, fiber lasers are used for spectral synthesis, achieving a single-channel single-mode laser output power of up to 10 kW. However, to reach 100 kW, nearly 100 channels of spectral synthesis are required. Furthermore, the beam quality is degraded after spectral synthesis due to the limited linewidth of the single-channel laser, and the wavelengths are mostly concentrated in the near-mid-infrared range of 915 nm, 1064 nm, and 1080 nm, resulting in a narrow range. Therefore, there is an urgent need for a spectral synthesis device that can achieve high power output while maintaining high beam quality and a wide wavelength coverage. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] This invention provides a semiconductor-pumped diamond Raman laser spectroscopy / temporal synthesis device, which provides a light source with narrow linewidth, high beam quality, and wide wavelength tunability for laser spectroscopy / temporal synthesis. It solves the problems of existing spectral synthesis technologies, such as the limited types of light sources available and the inability to meet the requirements of high power and high beam quality in synthesized spectra.

[0005] (II) Technical Solution

[0006] To address the limitations of existing technologies, this invention provides a semiconductor-pumped diamond Raman laser spectroscopy / timing synthesis device, comprising at least two semiconductor pump sources, at least one diamond Raman medium, a resonant cavity, a beam combining module, and a signal feedback adjustment module. The semiconductor pump sources emit pump light with tunable wavelength. The diamond Raman medium generates and outputs Raman laser light under the pumping of the semiconductor pump sources. The resonant cavity includes a first mirror and a second mirror for laser resonance, positioned along the interaction direction between the semiconductor pump sources and the diamond Raman medium, and located on opposite sides of the diamond Raman medium. The signal feedback adjustment module includes a laser wavelength monitor, a mid-range signal controller, and an automatic adjuster. The laser wavelength monitor monitors the pump light wave from the semiconductor pump sources. The system inputs the long wavelength information and Raman laser wavelength information to the intermediate signal controller. The intermediate signal controller obtains the maximum wavelength resolution difference of the beam combining module based on the Raman laser wavelength information and the maximum tuning wavelength difference that the semiconductor pump source can tune based on the pump light wavelength information. It then sends the maximum wavelength resolution difference, maximum tuning wavelength difference, and pump light wavelength information to the automatic adjuster. The automatic adjuster adjusts the output laser wavelength of some semiconductor pump sources based on the maximum wavelength resolution difference, maximum tuning wavelength difference, and pump light wavelength information, ensuring that the Raman lasers generated by adjacent semiconductor pump sources pumping diamond Raman media meet a certain Raman laser wavelength difference. The beam combining module is used to combine the laser beams after the wavelengths of the semiconductor pump sources have been adjusted.

[0007] Optionally, the maximum tuning wavelength difference Δλ P The difference between the maximum wavelength resolution and Δλ S Satisfy: Δλ P <Δλ S At that time, the wavelength difference of the Raman laser generated by adjacent semiconductor pump sources pumping diamond Raman media after adjustment is the maximum tuning wavelength difference Δλ. S Its wavelength is equal to the adjusted wavelength of the two adjacent pump lights λ. Pn , λ Pn+1 satisfy Where n and n+1 are the positions of two adjacent Raman laser wavelengths, λ Pn , λ Pn+1 λ is the pump light wavelength of two adjacent semiconductor pump sources, Δω is the Raman frequency shift of the diamond Raman medium, and c is the speed of the laser in air.

[0008] Optionally, the maximum tuning wavelength difference Δλ P The difference between the maximum wavelength resolution and Δλ S Satisfy: Δλ P ≥Δλ S When, then Δλ P For standard semiconductor pump source output laser tuning, then λ pn+1 =λpn +Δλ p Where n and n+1 are the positions of two adjacent Raman laser wavelengths, λ Pn , λ Pn+1 λ represents the pump light wavelength of two adjacent semiconductor pump sources.

[0009] Optionally, the amplitude ΔE of the automatic regulator's adjustment of the semiconductor pump source is related to the adjusted wavelength λ of the adjacent semiconductor pump source. pn , λ pn+1 The speed of light in vacuum, c, and Planck's constant h satisfy the following:

[0010] Optionally, the pump light generated by at least two semiconductor pump sources is a pulsed laser; the automatic regulator controls the emission time of the pump light emitted by the semiconductor pump sources so that the Raman laser generated after the at least two semiconductor pump sources pump the diamond Raman medium is in a continuous state.

[0011] Optionally, the beam combining module is placed after all Raman laser outputs to perform spectral / temporal synthesis of the Raman lasers; or the beam combining module is placed after all semiconductor pump sources to perform spectral / temporal synthesis of the semiconductor pump source lasers, thereby pumping the diamond Raman medium to generate a new spectral / temporal synthesized spectrum.

[0012] Optionally, the beam combining module includes two or more modules. The beam combining module first combines a portion of the pump light to pump the diamond Raman medium to generate Raman laser, and then combines it with the remaining pump light to pump the Raman laser generated by the diamond Raman medium.

[0013] Optionally, the diamond Raman medium can be arranged in multiple series, parallel, or series-parallel combinations.

[0014] Optionally, the beam combining module can be a grating, a prism, or a dichroic mirror.

[0015] (III) Beneficial Effects

[0016] This invention provides a semiconductor-pumped diamond Raman laser spectroscopy / timing synthesis device, which utilizes the maximum wavelength resolution difference of the beam combining module, i.e., the Raman laser wavelength difference Δλ. S Maximum tuning wavelength difference Δλ of semiconductor pump source P The signal feedback adjustment module controls the wavelength of the semiconductor pump source laser and the Raman laser generated by the diamond Raman medium, so that the wavelength difference between adjacent diamond Raman lasers meets the optimal beam combining conditions of the beam combining module. This provides a light source with narrow linewidth, high beam quality and wide wavelength tuning range for laser spectroscopy / temporal synthesis technology, thereby obtaining a high-power, high-beam-quality synthesized spectrum. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort, and should be within the protection scope of the present invention.

[0018] Figure 1 This is a schematic diagram of the structure of the first semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device provided in the embodiments of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the second semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device provided in the embodiments of the present invention;

[0020] Figure 3 This is a schematic diagram of the third semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device provided in the embodiments of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the fourth semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device provided in the embodiments of the present invention;

[0022] Figure 5 This is a schematic diagram of the fifth semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device provided in this embodiment of the invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Numerous specific details are set forth in the following detailed description in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] Figure 1This is a schematic diagram of the structure of a first semiconductor-pumped diamond Raman laser spectroscopy / timing synthesis device provided in an embodiment of the present invention. The semiconductor-pumped diamond Raman laser spectroscopy / timing synthesis device of this embodiment includes: at least two semiconductor pump sources, where n semiconductor pump sources are shown in the figure: a first semiconductor pump source P1, a second semiconductor pump source P2 to an nth semiconductor pump source Pn; at least one diamond Raman medium, where n diamond Raman media are shown in the figure: a first diamond Raman medium D1, a second diamond Raman medium D2 to an nth diamond Raman medium Dn; a resonant cavity, each resonant cavity including a first resonant cavity mirror and a second resonant cavity mirror; a signal feedback adjustment module, including: a laser wavelength monitor 11, a mid-range signal controller 12, and an automatic adjuster 13; and a beam combining module B.

[0027] A semiconductor pump source is used to emit pump light, and the wavelength of the pump light is tunable. The pump light emitted by the semiconductor pump source can be any type of laser, such as continuous, quasi-continuous, or pulsed. The specifications and models of various semiconductor pump sources can be the same or different, and this invention does not impose any restrictions on this.

[0028] A diamond Raman medium, positioned in the pump direction of a pump source, is used to generate and output Raman laser light under the action of pump light. This invention does not limit the shape of the diamond Raman medium; for example, it can be a cube, cuboid, or other arbitrary shapes.

[0029] Each resonant cavity includes a first lens and a second lens for laser resonance, positioned in the interaction direction between the semiconductor pump source and the diamond Raman medium. The first lens is highly transparent to the corresponding semiconductor pump source laser and highly reflective to the Raman laser generated by the corresponding diamond Raman medium. The second lens is highly reflective to the corresponding semiconductor pump source laser and partially reflects the Raman laser generated by the corresponding diamond Raman medium. This causes the semiconductor pump source laser and the Raman laser generated by the diamond Raman medium to oscillate within the resonant cavity, thereby increasing the output power of the Raman laser generated by the diamond Raman medium.

[0030] A laser wavelength monitor 11 is positioned to the side of several semiconductor pump sources and a diamond Raman medium. It monitors the pump light wavelength information of the semiconductor pump sources and the Raman laser wavelength information generated by the diamond Raman medium, and transmits the pump light wavelength information and Raman laser wavelength information to a mid-level signal controller 12. The laser wavelength monitor 11 may include one or more of the following: a spectrometer, an interferometer, a grating, Newton's rings, a Fresnel double prism, a double-slit laser, a laser power meter (pointer type), or an optical power meter.

[0031] The intermediate signal controller 12 is communicatively connected to the laser wavelength monitor 11 and receives pump light wavelength information and Raman laser wavelength information transmitted by the laser wavelength monitor 11. The intermediate signal controller 12 obtains the maximum wavelength resolution difference of the beam combining module based on the Raman wavelength information and sends the maximum wavelength resolution difference and pump light wavelength information to the automatic adjuster. The intermediate signal controller 12 also obtains the maximum tuning wavelength difference that the semiconductor pump source can tune based on the pump light wavelength information and sends the maximum tuning wavelength difference to the automatic adjuster. In this document, the maximum wavelength resolution difference is defined as: the smallest wavelength that the beam combining module with the lowest precision can recognize when multiple beam combining modules are included; and the smallest wavelength that the beam combining module can recognize when only one beam combining module is included. The maximum tuning wavelength is defined as: the smallest wavelength that the semiconductor pump source with the lowest precision can tune, and this value is determined by the semiconductor pump source itself. In some embodiments, the intermediate signal controller 12 can filter Raman laser wavelength information to select the required Raman laser wavelength and obtain the maximum wavelength resolution of the beam combining module based on the Raman laser wavelength. The intermediate signal controller 12 can also filter pump light wavelength information to select the pump light wavelength information corresponding to the required Raman laser, and then transmit the Raman laser wavelength information, the corresponding pump light wavelength information, the maximum wavelength resolution difference, and the maximum tuning wavelength to the automatic regulator 13. The intermediate signal controller 12 can be a programmable circuit board, a computer, a signal generator, or a mechanical controller.

[0032] Automatic regulator 13 is communicatively connected to intermediate signal controller 12 and receives pump light wavelength information, maximum wavelength resolution difference, and maximum wavelength tuning difference transmitted by intermediate signal controller 12. Based on the maximum wavelength resolution difference, maximum wavelength tuning difference, and pump light wavelength information, it adjusts the output laser wavelength and / or laser direction of some semiconductor pump sources so that the Raman lasers generated by the diamond Raman media pumped by adjacent semiconductor pump sources after adjustment satisfy a certain Raman laser wavelength difference. For example, the wavelength of the Raman laser output from the semiconductor pump source that needs to be adjusted can be determined based on the maximum wavelength resolution difference. Then, the pump light wavelength of the semiconductor pump source that needs adjustment can be calculated. The semiconductor pump source is then adjusted according to the calculated pump light wavelength, ultimately ensuring that the Raman lasers generated after adjacent semiconductor pump sources pump the diamond Raman medium meet a certain Raman laser wavelength difference. Alternatively, the pump light wavelength of the semiconductor pump source that needs to be tuned can be determined based on the maximum wavelength tuning difference. The semiconductor pump source is then tuned according to this pump light wavelength, ultimately ensuring that the Raman lasers generated after adjacent semiconductor pump sources pump the diamond Raman medium meet a certain Raman laser wavelength difference. The automatic regulator 13 can be one or more of a current regulator, voltage regulator, temperature regulator, and doping concentration regulator.

[0033] A beam combiner module is used to perform spectral / temporal synthesis of the pump source laser or Raman laser after the laser wavelength of the semiconductor pump source has been adjusted. This invention does not limit the number, type, or location of the beam combiner module; the beam combiner module can be a grating, prism, or dichroscope.

[0034] The semiconductor-pumped diamond Raman laser spectroscopy / timing synthesis device provided by this invention controls the pump light wavelength of the semiconductor pump source and the Raman laser wavelength generated by the pump diamond through a signal feedback adjustment module based on the maximum wavelength resolution difference of the beam combining module and the maximum tuning wavelength difference of the semiconductor pump source. This ensures that the adjusted Raman laser wavelength difference generated by adjacent semiconductor pump sources meets the optimal beam combining conditions, providing a light source with narrow linewidth, high beam quality, and a large wavelength tuning range for laser spectroscopy / timing synthesis technology, thereby obtaining a synthesized spectrum with high power and high beam quality.

[0035] In some embodiments, the number of semiconductor pump sources can be at least one, such as one pump source. At least two pump beams are generated by the splitting of the semiconductor pump source. These pump beams can pump the diamond Raman medium to generate at least two Raman laser beams. The wavelength and / or direction of the pump beams are adjusted by the signal feedback adjustment module according to the above adjustment process.

[0036] In some embodiments, the automatic regulator 13 obtains the maximum tuning wavelength difference Δλ P The difference between the maximum wavelength resolution and Δλ S Then, the magnitudes of the two values ​​are determined to ascertain the minimum adjustable wavelength of the entire semiconductor-pumped diamond Raman laser spectroscopy / timing synthesis device. When Δλ P <Δλ S When the wavelength difference between the Raman lasers generated by adjacent semiconductor pump sources pumping the diamond Raman medium after adjustment is reached, the maximum wavelength resolution difference Δλ of the beam combining module is obtained. S Then, the adjusted wavelengths λ of the two adjacent pump lights can be determined according to formula (1). Pn , λ Pn+1 .

[0037]

[0038] Where n and n+1 are the positions of the two adjacent Raman laser wavelengths, and λ Pn , λ Pn+1 Δω is the pump light wavelength of two adjacent semiconductor pump sources, Δω is the Raman frequency shift of the diamond Raman medium, and c is the speed of the laser in air.

[0039] In other embodiments, the automatic regulator 13 obtains the maximum tuning wavelength difference Δλ. P The difference between the maximum wavelength resolution and Δλ SThen, the magnitudes of the two values ​​are determined to ascertain the minimum adjustable wavelength of the entire semiconductor-pumped diamond Raman laser spectroscopy / timing synthesis device. When Δλ P ≥Δλ S When the wavelength difference between adjacent semiconductor pump sources pumping the diamond Raman medium is adjusted, it is the maximum tuning wavelength difference Δλ between the semiconductor pump sources. P Then, the adjusted wavelengths λ of the two adjacent pump lights can be determined according to formula (2). Pn , λ Pn+1 .

[0040] λ pn+1 =λ pn +Δλ p (2)

[0041] Where n and n+1 are the positions of the two adjacent Raman laser wavelengths, and λ Pn , λ Pn+1 λ represents the pump light wavelength of two adjacent semiconductor pump sources.

[0042] In the above embodiments, the energy of the semiconductor pump source is adjusted by the automatic regulator 13, thereby adjusting the wavelength of the corresponding semiconductor pump source. Ultimately, the Raman lasers generated by adjacent semiconductor pump sources pumping diamond Raman media meet a certain Raman laser wavelength difference. Specifically, the adjustment amplitude ΔE of the semiconductor pump source is determined by formula (3).

[0043]

[0044] Where ΔE is the magnitude of the automatic regulator's adjustment of the semiconductor pump source, and λ pn , λ pn+1 The wavelength of the adjacent semiconductor pump source after adjustment is given, c is the speed of light in vacuum, and h is Planck's constant.

[0045] In the above embodiments, the semiconductor-pumped diamond Raman laser spectroscopy / timing synthesis device may include a beam combining module, for example... Figure 1 As shown, the beam combining module B is placed after the Raman lasers (S1-Sn) output from all the diamond Raman media (D1~Dn), performing spectral / temporal combining of several Raman lasers to output a high-power, high-beam-quality combined spectrum. It can also be used for... Figure 2 As shown, beam combining module B is placed after the output lasers of all semiconductor pump sources (Po1~Pon). It first performs spectral / temporal combining on several pump lights (P1~Pn) to pump the diamond Raman medium, generating a spectral / temporal composite of Raman lasers. The semiconductor-pumped diamond Raman laser spectral / temporal combining device can include multiple beam combining modules, for example... Figure 4As shown, the pump light (P1 to Pi) generated by a portion of the semiconductor pump sources (Po1 to Poi) is first subjected to spectral / temporal synthesis through the first beam combining module B1, so as to synthesize the spectral / temporal of the Raman laser generated by pumping the diamond Raman medium; the Raman laser (Si+1 to Sn) generated by the partial semiconductor pump sources (Poi+1 to Pon) pumping the diamond Raman medium separately is then subjected to spectral / temporal synthesis through the second beam combining module B2; finally, the spectra / temporal sequences of the above two Raman lasers are combined through the third beam combining module B3, so that all Raman lasers are subjected to spectral / temporal synthesis.

[0046] In some embodiments, a semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device may include multiple diamond Raman media, such as Figure 1 As shown, the first diamond Raman medium D1, the second diamond Raman medium D2, and so on up to the nth diamond Raman medium Dn can be arranged in parallel. Different diamond Raman media can output the same or different Raman laser wavelengths. Please refer to [link / reference]. Figure 3 As shown, diamond Raman media can also be arranged in series, outputting several Raman laser wavelengths through multiple diamond Raman media. The number of Raman laser wavelengths is the same as the number of semiconductor pump sources. Please refer to [link / reference]. Figure 4 As shown, diamond Raman media can be arranged in a hybrid series and parallel configuration, with multiple diamond Raman media outputting multiple Raman laser wavelengths and a single diamond Raman media outputting a single Raman laser wavelength. In other embodiments, the semiconductor-pumped diamond Raman laser spectroscopy / timing synthesis device may include one diamond Raman media B, such as... Figure 2 As shown, diamond Raman media can be arranged individually, with each diamond Raman media outputting several Raman laser wavelengths. The number of Raman laser wavelengths is consistent with the number of semiconductor pump sources.

[0047] In the above embodiments, please refer to Figure 5 As shown, the semiconductor-pumped diamond Raman laser spectroscopy / timing synthesis device may also include an optical module F for beam shaping of the semiconductor-pumped laser source.

[0048] In the above embodiments, the semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device further includes a crystal heat sink disposed at the bottom of the diamond Raman medium to fix the diamond Raman medium and perform heat dissipation.

[0049] The semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis apparatus of the present invention will be described in detail below with reference to specific embodiments.

[0050] Example 1

[0051] The first semiconductor-pumped diamond Raman laser spectroscopy / temporal synthesis device provided in this embodiment is described in [reference needed]. Figure 1 As shown, it contains n semiconductor pump sources, including the first semiconductor pump source Po1, the second semiconductor pump source Po2, ..., the nth semiconductor pump source Pon, diamond Raman media D1, D2, ..., Dn corresponding to the semiconductor pump sources, and resonant cavities IC1 / OC1, IC2 / OC2, ..., ICn / OCn, including the first lens IC1, the second lens OC1, ..., the first lens ICn, and the second lens OCn; a signal feedback adjustment module, including a mid-range signal controller 12, a laser wavelength monitor 11, an automatic adjuster 13, and a beam combining module B.

[0052] The pump beams P1 to Pn emitted by n semiconductor pump sources Po1 to Pon are all continuous lasers, and the maximum tuning wavelength difference Δλ between the semiconductor pump sources is... P The wavelength is 10nm. Each semiconductor pump source emits pump light with identical parameters except for wavelength. The power is 1KW, and the light is linearly polarized. M 2 =3, n semiconductor pump sources Po1~Pon are arranged in parallel.

[0053] The diamond Raman media D1, D2, ..., Dn are all 2×2×7mm. 3 A cuboid is used to generate diamond Raman lasers S1, S2, ..., Sn, all with a Raman frequency shift Δω of 1332.5 cm. -1 It adopts a parallel arrangement, in which 2×2mm 2 The surface is the laser input / output end face.

[0054] Each resonant cavity is placed on both sides of the diamond Raman medium. The first lens is highly transparent to the pump light from the corresponding semiconductor pump source and highly reflective to the Raman laser generated by the diamond Raman medium. The second lens is highly reflective to the pump light from the corresponding semiconductor pump source and partially reflects the Raman laser generated by the diamond Raman medium. This is used to form laser oscillation and increase the output power of the Raman laser. The reflectivity of the second lens to the corresponding diamond Raman laser is 60%.

[0055] Beam combining module B is placed after the Raman laser output to perform spectral combining on the generated Raman lasers S1, S2, ..., Sn. The minimum wavelength resolution difference Δλ of beam combining module B is... S It is 2nm.

[0056] The semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device provided in this embodiment has the following adjustment process:

[0057] n semiconductor pump sources Po1~Pon emit continuous pump light P1~Pn, which, after passing through their respective diamond Raman media D1~Dn and resonant cavities, generate and output Raman lasers S1~Sn.

[0058] Laser wavelength monitor 11 transmits the monitored wavelength information of the semiconductor pump source laser and the Raman laser wavelength information generated by the diamond Raman medium to the intermediate signal controller 12. The intermediate signal controller 12 selects the required Raman laser wavelength as λ. S2 =1127.19nm, which is a continuous laser, and the corresponding semiconductor pump source laser wavelength is λ. p2 =980nm, a continuous laser, to obtain the maximum wavelength resolution difference Δλ of the beam combining module. S =2nm, the maximum tuning difference Δλ of the semiconductor pump source P =10nm, the intermediate signal controller 12 transmits the above wavelength information, maximum wavelength resolution difference, and maximum tuning difference to the automatic regulator 13. The automatic regulator 13 first transmits the maximum wavelength resolution difference Δλ of the beam combining module. S =2nm and the maximum tuning wavelength difference Δλ between the semiconductor pump source wavelength P When compared at 10nm, Δλ is satisfied. P >Δλ S The automatic regulator 13 will adjust according to the maximum tuning wavelength difference Δλ P =10nm as the standard, the pump light wavelength of adjacent semiconductor pump sources is adjusted to meet λ p1 =λ p2 -Δλ p =970nm, λ p3 =λ p2 +Δλ p =990nm, at which point the energy adjustment amplitude ΔE of the adjacent pump source satisfies At this time, the pump light output from the adjacent semiconductor pump source passes through the diamond Raman medium to generate Raman laser wavelengths of λ. S1 =1113.98nm, λ S3 =1140.44nm, which is the required Raman laser wavelength λ S2 The wavelength difference of 1127.19 nm is greater than the maximum wavelength resolution difference Δλ of the beam combining module. S =2nm, which meets the wavelength resolution requirements of the beam combining module, enabling optimal beam combining. At this point, the above adjustment mode will continue based on the adjusted semiconductor pump source laser until the output pump light wavelengths of the remaining semiconductor pump sources are all adjusted.

[0059] The beam quality of multiple Raman laser wavelengths output by the diamond Raman medium all reaches M. 2 Below 1.1, the linewidth narrows, and the single-channel output power approaches the quantum conversion limit, reaching over 0.8 kW. After spectral synthesis via a beam combiner module, the output power of the synthesized spectrum increases with the number of channels, and the beam quality M of the synthesized spectrum improves.2 ≈1.1, which satisfies the requirement of maintaining high beam quality while achieving high power output.

[0060] Example 2

[0061] This embodiment provides a second semiconductor-pumped diamond Raman laser spectroscopy / temporal synthesis device. Please refer to [link to relevant documentation]. Figure 2 As shown, this device differs from Embodiment 1 in that:

[0062] The pump beams P1 to Pn emitted by n semiconductor pump sources Po1 to Pon are all quasi-continuous lasers, and the maximum wavelength difference Δλ between the semiconductor pump sources is... P 4nm, power 1.2KW, linearly polarized light, M 2 =3.3, pulse width is 10ms, repetition rate is 500Hz. Figure 2 The pump light emitted by each semiconductor pump source in the array has the same parameters except for the wavelength.

[0063] It contains only one diamond Raman medium D, arranged in a separate configuration, measuring 4×4×6mm. 3 A cuboid is used to generate diamond Raman lasers S1, S2, ..., Sn, all with a Raman frequency shift Δω of 1332.5 cm. -1 , of which 4×4mm 2 The surface is the laser input / output end face.

[0064] There is only one resonant cavity ICI / OC1. The first mirror IC1 of the resonant cavity is highly transparent to the pump light emitted by all semiconductor pump sources and highly reflective to the Raman laser generated by the diamond Raman medium. The second mirror OC1 is highly reflective to the laser of the semiconductor pump source and partially reflects the Raman laser generated by the diamond Raman medium. It is used to form laser oscillation and improve the output power of the Raman laser. The reflectivity of the second mirror to the diamond Raman laser is 50%.

[0065] The beam combining module B is placed after the pump light emitted by all semiconductor pump sources. It contains n lenses. The lens corresponding to Po1 is highly transparent to pump light P1 and highly reflective to pump lights P2, P3, ..., Pn. The remaining lenses are highly reflective to their corresponding pump lights and highly transparent to subsequent pump lights. The beam combining module combines the pump light and then passes it through the first lens IC1 of the resonant cavity to pump the 4×4mm diamond Raman medium. 2 At the end face, the combined spectrum of the diamond Raman laser is directly generated, and at this time the maximum wavelength resolution difference Δλ of the beam combining module is reached. S =Δλ P =4nm.

[0066] The semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device provided in this embodiment has the following adjustment process:

[0067] Laser wavelength monitor 11 transmits the monitored wavelength information of the semiconductor pump source laser and the Raman laser wavelength information generated by the diamond Raman medium to the intermediate signal controller 12. The intermediate signal controller 12 selects the required Raman laser wavelength as λ. S2 =2214.62nm, a quasi-continuous laser with a pulse width of 10ms and a repetition rate of 500Hz, corresponding to a semiconductor pump source laser wavelength of λ. p2 =1710nm, a quasi-continuous laser, pulse width 10ms, repetition rate 500Hz, at which the maximum tuning wavelength difference Δλ between semiconductor pump sources is obtained. P =4nm, maximum wavelength resolution difference Δλ of the beam combining module S =Δλ P =4nm, the intermediate signal controller 12 transmits the above wavelength information, the maximum tuning wavelength difference of the semiconductor pump source, and the maximum wavelength resolution difference of the beam combining module to the automatic regulator 13. The automatic regulator 13 transmits the maximum tuning wavelength difference Δλ of the semiconductor pump source to the automatic regulator 13. P =4nm, compared with the maximum wavelength resolution difference of the beam combining module, at this time Δλ S =Δλ P Based on the maximum tuning wavelength difference as the standard, the pump light wavelengths of adjacent semiconductor pump sources are adjusted to satisfy: λ p1 =λ p2 -Δλ p =1706nm, λ p3 =λ p2 +Δλ p =1714nm, at which point the energy adjustment amplitude ΔE of the adjacent pump source satisfies Furthermore, the timing of quasi-continuous laser emission from adjacent semiconductor pump sources is controlled to satisfy λ. p1 Compared to λ p2 10ms advance launch, λ p3 Compared to λ p2 The emission is delayed by 10ms to achieve the spectral / temporal synthesis effect of quasi-continuous laser. The Raman laser generated by pumping the diamond Raman medium after spectral / temporal synthesis has wavelengths of λ. S1 =2207.91nm, λ S3 =2221.33nm, and the generation time sequence is consistent with the laser emission time of the semiconductor pump source, achieving the effect of spectral / temporal synthesis. At this time, the above adjustment mode will continue to be performed according to the adjusted semiconductor pump source pump light until the output pump light wavelength and emission time of the remaining semiconductor pump sources are all adjusted.

[0068] The spectral / temporal synthesis of multiple Raman laser wavelengths output from a pumped diamond Raman medium, using a pumped light, produces a spectral / temporal composite spectrum, with beam quality reaching M...2 = Around 1.05, the linewidth narrows, and the power of a single wavelength can reach over 0.9KW. With the increase in the number of paths, the output Raman laser gradually becomes a continuous laser composed of multiple wavelengths. The quality M of the synthesized spectral beam from the spectral / temporal synthesis... 2 ≈1.08, which satisfies the requirement of maintaining high beam quality while achieving high power output.

[0069] Example 3

[0070] Please see Figure 4 As shown, this embodiment provides a fourth semiconductor-pumped diamond Raman laser spectroscopy / timing synthesis device, which differs from Embodiment 2 in that...

[0071] The pump light emitted by n semiconductor pump sources Po1 to Poi is a pulsed laser. The maximum tuning wavelength difference Δλ between the semiconductor pump sources Po1, Po2, ..., Poi is given. P The maximum tuning wavelength difference Δλ between the semiconductor pump source Poi+1 and Pon is 4nm. P It is 2nm. Figure 4 Each semiconductor pump source in the array emits pump light with identical parameters except for wavelength and maximum tuning resolution. The power is 3 kW, and the light is linearly polarized. 2 =2.2, pulse width is 40ns, repetition rate is 5KHz.

[0072] The diamond Raman media are arranged in a hybrid series and parallel configuration. Semiconductor pump sources Po1 to Poi pump the diamond Raman media D1 and Di+1 to Dn, simultaneously outputting multiple Raman laser wavelengths S1 to Si. Semiconductor pump sources Poi+1 to Pon pump the diamond Raman media Di+1 to Dn, respectively, simultaneously outputting multiple Raman laser wavelengths Si+1 to Sn. All diamond Raman media are 4×4×8mm. 3 The cuboid has a Raman frequency shift Δω of 1332.5 cm. -1 , of which 4×4mm 2 This is the input surface for the pump light.

[0073] The first beam combining module B1 is placed after the pump light emitted by the semiconductor pump sources Po1 to Poi. It contains i lenses. The lens corresponding to Po1 is highly transparent to pump light P1 and highly reflective to pump lights P2, P3, ..., Pi. The other lenses are highly reflective to their corresponding pump lights and highly transparent to subsequent pump lights. First, the pump lights P1, P2, ..., Pi are combined, and then the beam is pumped through the resonant cavity IC1 to the first 4×4mm diamond Raman medium. 2 The end face, and the subsequent 4×8mm diamond Raman media Di, ..., Dn 2At the end face, a new spectral / temporal composite spectrum is generated; the second beam combining module B2 is placed after the diamond Raman lasers Si+1 to Sn, containing ni lenses. The lens corresponding to Raman laser Sn is highly reflective of Raman laser Sn, and highly transparent of Raman lasers Si+1 to Sn-1. The remaining lenses are highly reflective of their corresponding Raman lasers, and highly transparent of their corresponding left-side Raman lasers. Spectral / temporal composites of Raman lasers Si+1 to Sn are performed; the third beam combining module B3 is placed after all Raman lasers, and performs a new spectral / temporal composite of the two spectral / temporal composite spectra composed of Raman lasers to obtain the final spectral / temporal spectrum. The maximum wavelength resolution difference Δλ of the first beam combining module B1 is... S The maximum wavelength resolution difference ΔA of the second beam combining module B2 is 3nm. S The maximum wavelength resolution difference Δλ of the third beam combining module B3 is 5nm. S It is 10nm.

[0074] Automatic regulator 13 adjusts the pointing of pump light Pi+1 to Pn of semiconductor pump sources Poi+1 to Pon.

[0075] The semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device provided in this embodiment has the following adjustment process:

[0076] Laser wavelength monitor 11 transmits the monitored wavelength information of the semiconductor pump source laser and the Raman laser wavelength information generated by the diamond Raman medium to the intermediate signal controller 12. The intermediate signal controller 12 selects the required Raman laser wavelength as λ. S2 =1239.77nm, is a pulsed laser with a pulse width of 40ns and a repetition rate of 5kHz. The corresponding semiconductor pump source laser wavelength is λ. p2 =1064nm, which is a quasi-continuous laser with a pulse width of 40ns and a repetition rate of 5kHz. At this time, the lowest wavelength resolution difference among the beam combining modules B1, B2, and B3 is obtained, which is the maximum wavelength resolution difference Δλ of beam combining module 3. S =10nm, obtain the lowest precision tuning wavelength difference among semiconductor pump sources Po1~Poi and semiconductor pump sources Poi+1~Pon, that is, the maximum tuning wavelength difference Δλ of semiconductor pump sources Po1~Poi. P =4nm, the mid-range signal controller 12 will use the above wavelength information and the maximum wavelength resolution difference Δλ S =10nm, maximum tuning wavelength difference Δλ of semiconductor pump source P =4nm, communication transmission to automatic adjuster 13. Automatic adjuster 13 first adjusts the maximum wavelength resolution difference Δλ of the beam combining module. S =10nm and the maximum tuning wavelength difference Δλ between the semiconductor pump source wavelength P When compared to 4nm, Δλ is satisfied.P <Δλ S The automatic regulator will adjust according to the formula. As a standard, the pump light wavelength of adjacent semiconductor pump sources is adjusted, at which point λ p1 =1056.63nm, λ p3 =1071.36nm, at which point the energy adjustment amplitude ΔE of the adjacent pump source satisfies Seeking Furthermore, the timing of quasi-continuous laser emission from adjacent semiconductor pump sources is controlled to satisfy λ. p1 Compared to λ p2 40ns advance launch, λ p3 Compared to λ p2 Emission is delayed by 40 ns to achieve the spectral / temporal synthesis effect of quasi-continuous laser. At this time, the pump light output from adjacent semiconductor pump sources passes through the diamond Raman medium to generate Raman laser wavelengths of λ. S1 =1229.77nm, λ S3 =1249.77nm, and the generation time sequence is consistent with the laser emission time of the semiconductor pump source, which not only satisfies the maximum wavelength resolution difference Δλ of the beam combining module. S =10nm, and multiple Raman lasers generate continuous spectra in time, enabling optimal spectral / temporal synthesis to achieve the desired effect. At this point, the above adjustment mode will continue based on the adjusted semiconductor pump source laser until the output pump light wavelength and emission time of the remaining semiconductor pump sources are all adjusted.

[0077] The spectral / temporal synthesis of multiple Raman laser wavelengths output from a pumped diamond Raman medium, using a pumped light, produces a spectral / temporal composite spectrum, with beam quality reaching M... 2 = Around 1.06, the linewidth narrows, and the power of a single wavelength can reach over 2KW. With the increase in the number of paths, the output Raman laser gradually becomes a continuous laser composed of multiple wavelengths. The quality M of the synthesized spectral beam from the spectral / temporal synthesis... 2 ≈1.09, which satisfies the requirement of maintaining high beam quality while achieving high power output.

[0078] Example 4

[0079] Please see Figure 5 As shown, this embodiment provides a fifth semiconductor-pumped diamond Raman laser spectroscopy / timing synthesis device, which differs from Embodiment 1 in that...

[0080] The pump light P1 to Pi emitted by i semiconductor pump sources Po1 to Poi is a pulsed laser with a pulse width of 20ns, a repetition rate of 10KHz, and a maximum tuning wavelength difference of 2nm; the pump light Pi+1 to Pn emitted by ni semiconductor pump sources Poi+1 to Pon is a continuous laser with a maximum tuning wavelength difference of 4nm. Figure 5 Except for the laser wavelength and the maximum tuning wavelength difference, the pump light emitted by each type of semiconductor pump source has the same parameters, including a power of 1KW and a beam quality of M. 2 =2, linearly polarized light.

[0081] An optical device F is placed after n semiconductor pump sources generate pump light P1 to Pn, and performs optical shaping on the pump light P1 to Pn.

[0082] Beam combining module B is placed after the output of diamond Raman lasers S1 to Sn to perform spectral / temporal synthesis of Raman lasers S to Sn. The minimum wavelength resolution difference Δλ of beam combining module B is... S It is 10nm.

[0083] The semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device provided in this embodiment has the following adjustment process:

[0084] Laser wavelength monitor 11 transmits the monitored wavelength information of the semiconductor pump source laser and the Raman laser wavelength information generated by the diamond Raman medium to the intermediate signal controller 12. The intermediate signal controller 12 selects the required Raman laser wavelength as λ. S2 =1042.05nm, which is a continuous laser, and the corresponding semiconductor pump source laser wavelength is λ. p2 =915nm, a continuous laser, to obtain the maximum wavelength resolution difference Δλ of the beam combining module. S =10nm, the lowest wavelength tuning resolution difference among semiconductor pump sources Po1~Poi and Poi+1~Pon, i.e. the maximum tuning resolution difference Δλ between semiconductor pump sources Poi+1~Pon. P =4nm. The intermediate signal controller 12 transmits the above wavelength information, maximum wavelength resolution difference, and maximum tuning resolution difference to the automatic regulator 13. The automatic regulator 13 first transmits the maximum wavelength resolution difference Δλ of the beam combining module. S =10nm and the maximum tuning wavelength difference Δλ between the semiconductor pump source wavelength P When compared to 4nm, Δλ is satisfied. P <Δλ S Automatic regulator 13 will adjust according to the formula As a standard, the pump light wavelength of adjacent semiconductor pump sources is adjusted, at which point λ p1 =907.28nm, λ p3=922.7nm, at which point the energy adjustment amplitude ΔE of the adjacent pump source satisfies Seeking The generated Raman laser wavelength is λ S1 =1032.05nm, λ S3 =1052.05nm. If the pump light emitted by adjacent semiconductor pump sources is pulsed, the emission time of adjacent pump light can be delayed, such that the emission time of the previous pump light pulse is advanced by 20ns and the emission time of the next pump light pulse is delayed by 20ns. If the pump light emitted by adjacent semiconductor pump sources is continuous laser, then the emission time does not need to be processed. In this case, the wavelength of the Raman laser satisfies the maximum wavelength resolution difference Δλ of the beam combining module. S =10nm, which enables optimal spectral / temporal synthesis, achieving the effect of spectral / temporal synthesis. At this time, the spectral / temporal synthesis spectrum contains both pulsed laser and continuous laser types.

[0085] The spectral / temporal synthesis of multiple Raman laser wavelengths output from a pumped diamond Raman medium, using a pumped light, produces a spectral / temporal composite spectrum, with beam quality reaching M... 2 = Around 1.02, the linewidth narrows, and the power of a single wavelength can reach over 0.8KW. With the increase in the number of paths, the output Raman laser gradually becomes a continuous laser composed of multiple wavelengths. The quality M of the synthesized spectral beam from the spectral / temporal synthesis... 2 ≈1.03, which satisfies the requirement of maintaining high beam quality while achieving high power output.

Claims

1. A semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device, characterized in that, Includes at least two semiconductor pump sources, at least one diamond Raman dielectric, a resonant cavity, a beam combiner module, and a signal feedback conditioning module: The semiconductor pump source is used to emit pump light, the wavelength of which is tunable; The diamond Raman medium is used to generate and output Raman laser under the pumping of the semiconductor pump source; The resonant cavity includes a first mirror and a second mirror for laser resonance, and is positioned in the direction of interaction between the semiconductor pump source and the diamond Raman medium, and is located on both sides of the diamond Raman medium; The signal feedback adjustment module includes a laser wavelength monitor, an intermediate signal controller, and an automatic adjuster. The laser wavelength monitor monitors the pump light wavelength information and Raman laser wavelength information of the semiconductor pump source, and outputs the pump light wavelength information and Raman laser wavelength information to the intermediate signal controller. The intermediate signal controller obtains the maximum wavelength resolution difference of the beam combining module based on the Raman laser wavelength information, obtains the maximum tuning wavelength difference that the semiconductor pump source can tune based on the pump light wavelength information, and sends the maximum wavelength resolution difference, the maximum tuning wavelength difference, and the pump light wavelength information to the automatic adjuster. The automatic adjuster adjusts the output laser wavelength of part of the semiconductor pump source according to the maximum wavelength resolution difference, the maximum tuning wavelength difference and the pump light wavelength information, so that the Raman laser generated by the adjacent semiconductor pump sources pumping the diamond Raman medium meets the optimal beam combining conditions of the beam combining module. The beam combining module is used to combine the laser beam after the wavelength of the semiconductor pump source has been adjusted.

2. The semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis device according to claim 1, characterized in that, The maximum tuning wavelength difference Resolution difference with maximum wavelength satisfy: At that time, the wavelength difference of the Raman laser generated by adjacent semiconductor pump sources pumping the diamond Raman medium after adjustment is the maximum tuning wavelength difference. Its wavelength is the same as the two adjacent pump light wavelengths after adjustment. , satisfy: Where n and n+1 are the positions of two adjacent Raman laser wavelengths. , The pump light wavelengths of two adjacent semiconductor pump sources, denoted as , where is the Raman frequency shift of the diamond Raman medium, and c is the speed of light in vacuum.

3. The semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis apparatus according to claim 1, characterized in that, The maximum tuning wavelength difference Resolution difference with maximum wavelength satisfy: At that time, then according to the above To perform standard tuning of the output laser from the semiconductor pump source, then Where n and n+1 are the positions of two adjacent Raman laser wavelengths. , λ represents the pump light wavelength of two adjacent semiconductor pump sources.

4. The semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis apparatus according to claim 2 or 3, characterized in that, The automatic regulator adjusts the amplitude of the semiconductor pump source. The wavelength of the adjacent semiconductor pump source after adjustment , , vacuum speed of light and Planck's constant satisfy: .

5. The semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis apparatus according to claim 1, characterized in that, The pump light generated by at least two of the semiconductor pump sources is a pulsed laser; The automatic regulator controls the emission time of the pump light emitted by the semiconductor pump source so that the Raman laser generated after the at least two semiconductor pump sources pump the diamond Raman medium is in a continuous state.

6. The semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis apparatus according to claim 1, characterized in that, The beam combining module is placed after all the Raman laser outputs to perform spectral / temporal synthesis of the Raman lasers; or The beam combining module is placed after all the semiconductor pump sources to perform spectral / temporal synthesis of the laser light from the semiconductor pump sources, thereby pumping the diamond Raman medium to generate a new spectral / temporal synthesized spectrum.

7. The semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis apparatus according to claim 1, characterized in that, The beam combining module includes two or more modules. The beam combining module first combines a portion of the pump light to pump the diamond Raman medium to generate Raman laser, and then combines it with the remaining pump light to pump the Raman laser generated by the diamond Raman medium.

8. The semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis apparatus according to claim 1, characterized in that, The diamond Raman medium is arranged in multiple series, parallel, or series-parallel combinations.

9. The semiconductor-pumped diamond Raman laser spectroscopy / time-series synthesis apparatus according to claim 1, characterized in that, The beam combining module includes at least one of a grating, a prism, and a dichroic mirror.

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