CN217087125U - Narrow pulse width laser with high repetition frequency and high beam quality - Google Patents
Narrow pulse width laser with high repetition frequency and high beam quality Download PDFInfo
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- CN217087125U CN217087125U CN202221033205.6U CN202221033205U CN217087125U CN 217087125 U CN217087125 U CN 217087125U CN 202221033205 U CN202221033205 U CN 202221033205U CN 217087125 U CN217087125 U CN 217087125U
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Abstract
The utility model provides a narrow pulse width laser of high repetition frequency high beam quality, including electro-optic Q-switched resonant cavity, first optical isolator, the module of enlarging in two passes, first one-half wave plate, second optical isolator and the beam quality optimization module that sets gradually, the central point that the module was optimized to electro-optic Q-switched resonant cavity, first optical isolator, two passes module of enlarging, first one-half wave plate, second optical isolator and beam quality is on same water flat line. The utility model discloses a narrow pulse width laser pulse output of high repetition frequency, high light beam quality has solved the serious problem of worsening of light beam quality that traditional laser instrument introduced at power amplification in-process thermal effect, the effectual work efficiency that has promoted fields such as laser radar, laser beam machining, photoelectricity confrontation realizes the laser output of high peak power high light beam quality.
Description
Technical Field
The utility model relates to a laser instrument field especially relates to high repetition frequency high beam quality's narrow pulse width laser instrument.
Background
With the rapid development of laser technology, the application requirements of narrow pulse width lasers with high repetition frequency and high beam quality in the fields of laser radar, laser processing, photoelectric countermeasure and the like are continuously increased. For example: the laser radar takes laser as an information carrier and is widely applied to the fields of environment detection, terrain and ocean mapping and the like; the laser processing utilizes the interaction characteristic of laser and substances, and has obvious processing advantages in the fields of material cutting, welding, strengthening, forming and the like.
The light source with high repetition frequency and high beam quality can greatly improve the speed of scanning and data absorption of the laser radar and can also improve the speed and efficiency of laser processing, so that the development of a narrow pulse width laser with high repetition frequency and high beam quality is a core power for promoting the rapid development of the fields of the laser radar, the laser processing and the like.
Generally, two main means for realizing high repetition frequency laser output are mode locking technology and Q-switching technology. Although the mode locking technology can realize pulse output with repetition frequency up to MHz and even GHz, the output energy is extremely low, usually in the order of-nJ, and all the pulse output are in a multi-longitudinal-field mode, so the mode locking technology is less applied to free space. Currently, the commonly used Q-switching technologies of the mainstream all-solid-state laser include electro-optic Q-switching, acousto-optic Q-switching and passive Q-switching, wherein the acousto-optic Q-switching is not high in output power and difficult to be lower than 30ns in pulse width because the peak power of an ultrasonic oscillator is limited by the process of an acoustic generator; the problems of lower repeatable precision, wider pulse width and low energy stability of output laser pulse in passive Q-switching exist; the electro-optical Q-switch can simultaneously output narrow pulse width laser with high repetition frequency due to the extremely high control precision.
In addition, the currently common amplification technologies mainly include CPA (phased-pulse amplification), OPCPA (optical parametric-pulse amplification), MOPA (master oscillator power amplifier) + SBS-PCM (stimulated Brillouin scattering phase conjugate mirror). CPA is used as an amplification means applied earlier, and can easily realize laser pulse output with peak power of GW and pulse width of ns, but the defect is obvious, and the limitation of VBG (volume Bragg grating) damage threshold becomes the development bottleneck of the technology in recent years. In recent years, OPCPA technology has gradually replaced CPA technology to become the mainstream amplification means, which successfully gets rid of the influence of VBG damage threshold to realize laser output with higher peak power, but with the difficulties such as extremely high quality requirement of pump light and phase matching problem of pump light and signal light. As the most commonly used MOPA technology at present, the technology is widely applied to the development work of a large-energy all-solid-state laser because the operation complexity is much lower than the two technologies and the laser output with extremely high peak power can still be realized. The only drawback of this technique is the problem of severe thermal effects during amplification, which can lead to severe deterioration of the beam quality of the output laser.
SUMMERY OF THE UTILITY MODEL
The technical problem that the quality of the laser beam worsens to the low and high power laser of laser repetition frequency, the utility model provides a narrow pulse width laser of high repetition frequency high beam quality has solved the problem that leads to the serious deterioration of laser beam quality because of the fuel effect.
In order to achieve the above purpose, the technical solution of the present invention is realized as follows: the narrow pulse width laser with high repetition frequency and high beam quality is characterized in that: the central points of the electro-optic Q-switching resonant cavity, the double-pass amplification module, the first one-second wave plate and the light beam quality optimization module are on the same horizontal line; the electro-optic Q-switching resonant cavity generates high-repetition-frequency linearly polarized seed light, the seed light enters the double-pass amplification module for power amplification, and then enters the beam quality optimization module to generate narrow-pulse-width laser pulses with high beam quality.
Furthermore, a first optical isolator is arranged between the electro-optical Q-switching resonant cavity and the two-way amplification module, and the central points of the electro-optical Q-switching resonant cavity, the first optical isolator and the two-way amplification module are arranged on the same horizontal line; a second optical isolator is arranged between the first one-half wave plate and the light beam quality optimization module, and the central points of the first one-half wave plate, the second optical isolator and the light beam quality optimization module are arranged on the same horizontal line; the first optical isolator and the second optical isolator are respectively composed of a polarizer, a Faraday rotator and a half wave plate which are sequentially arranged.
Furthermore, the electro-optical Q-switching resonant cavity comprises a first 0-degree total reflector, an electro-optical Q-switching switch, a first polarizer, a first LD side pump module and an output mirror which are sequentially arranged, the central points of the first 0-degree total reflector, the electro-optical Q-switching switch, the first polarizer, the first LD side pump module and the output mirror are on the same horizontal line, and seed light is output by the output mirror and enters the first optical isolator.
Furthermore, the double-pass amplification module comprises a second polarizer, a first single-pass amplifier, a first quarter-wave plate and a second 0-degree total reflector, and the central points of the second polarizer, the first single-pass amplifier, the first quarter-wave plate and the second 0-degree total reflector are on the same horizontal line; after passing through the first single-pass amplifier and the first quarter-wave plate, the seed light is reflected by the second 0-degree total reflector, the double-pass amplification of the seed light is realized through the first single-pass amplifier again, and finally the high-energy seed light is output from the second polarizer.
Further, the beam quality optimization module comprises a third polarizer, a second quarter wave plate, a first positive lens and a Brillouin medium pool, and the center points of the third polarizer, the second quarter wave plate, the first positive lens and the Brillouin medium pool are on the same horizontal line.
Further, a window mirror is arranged on the opposite side of the Brillouin medium pool, an inclination angle is formed between the window mirror and the horizontal direction, and the centers of the window mirror and the first positive lens are on the same horizontal line.
Further, the second 0-degree total reflection mirror is plated with a total reflection film, and an included angle between the total reflection film and incident light is 90 degrees, so that total reflection of seed light is realized; the third polarizer is coated with an optical polarizing film and has an angle to the horizontal of Brewster's angle θ.
The utility model with the structure has simple structure and good stability, can be used in advanced fields such as laser radar, laser processing, photoelectric countermeasure and the like, and overcomes the defects of low output energy, wider acousto-optic Q-switching pulse width and low passive Q-switching repetition frequency of the mode locking technology by utilizing the electro-optic Q-switching resonant cavity to realize the laser output with high repetition frequency and narrow pulse width; the MOPA technology can generate high peak power, and the SBS-PCM is combined, so that the problem that the quality of a light beam is seriously deteriorated due to the thermal effect in the power amplification process of the traditional laser is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic diagram of the electro-optic Q-switched resonator shown in FIG. 1.
Fig. 3 is a schematic structural diagram of the double-pass amplifying module shown in fig. 1.
Fig. 4 is a schematic structural diagram of the beam quality optimization module shown in fig. 1.
Fig. 5 is a schematic diagram of the inclination of the brillouin medium cell shown in fig. 4.
Fig. 6 is a schematic diagram of the optical path of the brillouin medium pool window mirror shown in fig. 4.
In the figure, 1 is an electro-optical Q-switching resonant cavity, 2 is a first optical isolator, 3 is a double-city amplification module, 4 is a first one-half wave plate, 5 is a second optical isolator, 6 is a beam quality optimization module, 1-1 is a first 0-degree total reflector, 1-2 is an electro-optical Q-switching switch, 1-3 is a first polarizer, 1-4 is a first LD side pump module, 1-5 is an output mirror, 3-1 is a second polarizer, 3-2 is a first single-pass amplifier, 3-3 is a first one-quarter wave plate, 3-4 is a second 0-degree total reflector, 6-1 is a third polarizer, 6-2 is a second one-quarter wave plate, 6-3 is a first positive lens, 6-4 is a Brillouin medium pool, theta is Brewster angle, alpha is a first window mirror front surface incidence angle of the Brillouin medium pool, beta is the first inclined angle of the Brillouin medium pool, beta 1 Is the second inclination angle of the Brillouin medium pool, d 1 Height of the first positive lens, d 2 Is the distance between the center of the first positive lens and the incident point of the window mirror, d 3 The distance between the upper end of the first positive lens 6-3 and the upper end of the Brillouin medium pool 6-4, f is the focal length of the first positive lens, alpha 'is the refraction angle of the front surface of the first window mirror of the Brillouin medium pool, alpha' is the refraction angle of the rear surface of the first window mirror of the Brillouin medium pool, and N is the refraction angle of the rear surface of the first window mirror of the Brillouin medium pool 1 Is refractive index of air, N 2 Is the refractive index of glass, N 3 D is the dielectric index and D is the first glazing thickness.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
As shown in fig. 1, the narrow pulse width laser with high repetition frequency and high beam quality includes an electro-optic Q-switched resonant cavity 1, a two-pass amplification module 3, a first one-half wave plate 4 and a beam quality optimization module 6, which are sequentially arranged, and the central points of the electro-optic Q-switched resonant cavity 1, the two-pass amplification module 3, the first one-half wave plate 4 and the beam quality optimization module 6 are on the same horizontal line. A first optical isolator 2 is arranged between the electro-optical Q-switching resonant cavity 1 and the double-pass amplification module 3, and the central points of the electro-optical Q-switching resonant cavity 1, the first optical isolator 2 and the double-pass amplification module 3 are arranged on the same horizontal line; a second optical isolator 5 is arranged between the first one-half wave plate 4 and the light beam quality optimization module 6, and the central points of the first one-half wave plate 4, the second optical isolator 5 and the light beam quality optimization module 6 are arranged on the same horizontal line; the first optical isolator 2 and the second optical isolator 5 are respectively composed of a polarizer, a Faraday rotator and a half wave plate which are arranged in sequence.
The electro-optical Q-switched resonant cavity 1 mainly functions to generate high-repetition-frequency linearly polarized seed light, and as shown in FIG. 2, the electro-optical Q-switched resonant cavity 1 includes a first 0-degree total reflector 1-1, an electro-optical Q-switched switch 1-2, a first polarizer 1-3, a first LD side pump module 1-4, and an output mirror 1-5, which are sequentially arranged. The electro-optical Q-switched resonant cavity 1 utilizes a first 0-degree total reflection mirror 1-1 and an output mirror 1-5 to form a resonant cavity, the electro-optical Q-switched resonant cavity 1 is in a high-loss state by applying voltage to an electro-optical crystal in an electro-optical Q-switched switch 1-2 and combining the action of a first polarizer 1-3, so that the accumulation of the number of reversed particles is realized, the external voltage is removed after the accumulation is completed, the electro-optical Q-switched resonant cavity 1 continuously oscillates, the energy accumulated by a first LD side pump module 1-4 in high loss is extracted, and finally high-repetition frequency linearly polarized seed light is output at the output mirror 1-5. Seed light is shot into first opto-isolator 2 by electro-optic Q-switched resonant cavity 1, and the light of reverse transmission is obstructed for utilizing the polarization principle to first opto-isolator 2's primary importance, ensures that the light of shooting one-way passes through, protects electro-optic Q-switched resonant cavity 1.
As shown in fig. 3, the dual-pass amplification module 3 mainly functions to generate laser with high peak power by utilizing the MOPA technology, and the dual-pass amplification module 3 includes a second polarizer 3-1, a first single-pass amplifier 3-2, a first quarter-wave plate 3-3 and a second 0 ° total reflector 3-4, and the central points of the second polarizer 3-1, the first single-pass amplifier 3-2, the first quarter-wave plate 3-3 and the second 0 ° total reflector 3-4 are on the same horizontal line. Wherein the second polarizer 3-1 mainly functions to output the vertically linearly polarized seed light; the first single-pass amplifier 3-2 is mainly used for amplifying the passing light; the first quarter-wave plate 3-3 is used for changing the polarization state of the seed light; the second 0 degree total reflector 3-4 forms an included angle of 90 degrees with the transmission direction of the seed light, and a total reflection film is coated on the surface of the second 0 degree total reflector, so that the total reflection of the incident laser is ensured, the loss is reduced, the change of a light path is realized, and the function of reflecting all the incident light is realized. The seed light is emitted by a first optical isolator 2 and then enters a first single pass amplifier 3-2 for first amplification, then enters a second 0-degree total reflector 3-4 through a first quarter wave plate 3-3, the second 0-degree total reflector 3-4 reflects all the incident seed light, so that the seed light passes through the first quarter wave plate 3-3 and the first single pass amplifier 3-2 again to realize double-pass amplification of the seed light, finally the polarized and output high-energy laser is input into a second optical isolator 5 through a first half wave plate 4 at a second polarizer 3-1, the polarization state of the high-energy laser is converted into a horizontal polarization state through the first half wave plate 4 to ensure that the high-energy laser can pass through a beam quality optimization module 6, and the second optical isolator 5 mainly acts to ensure that the incident light passes through in a single direction, the two-way amplification module 3 is protected.
As shown in fig. 4, the beam quality optimization module 6 includes a third polarizer 6-1, a second quarter wave plate 6-2, a first positive lens 6-3 and a brillouin medium pool 6-4, wherein the third polarizer 6-1, the second quarter wave plate 6-2, the first positive lens 6-3 and the brillouin medium pool 6-4 have center points on the same horizontal line; and a window mirror is arranged on the opposite side of the Brillouin medium pool (6-4), the window mirror and the center of the first positive lens (6-3) are on the same horizontal line, and the included angle between the window mirror and the horizontal plane is beta.
Wherein the third polarizer 6-1 mainly functions in combination with the second quarter-wave plate 6-2 to change the polarization state of the laser light to control the polarization output of the laser light. The high-energy laser passes through the third polarizer 6-1 and the second quarter-wave plate 6-2 and then is emitted into the first positive lens 6-3, the power density of the high-energy laser is improved through the focusing of the first positive lens 6-3, an electrostrictive effect stress sound-producing wave field is generated at a focal point, Stokes light is generated, and the purpose of optimizing the beam quality is achieved through SBS-PCM; the Brillouin medium pool 6-4 is mainly used for generating stimulated Brillouin scattering, optimizing beam quality and generating high-beam-quality Stokes light which is output backwards.
Specifically, the focal length of the first positive lens 6-3 should satisfy the following constraint condition:
wherein d is 2 The distance between the center of the first positive lens and the incident point of the window mirror is L, which is the optimal interaction length of the high-energy laser and the output Stokes light and satisfies the formula L ═ c τ p /2n，L 1 The length of the Brillouin medium pool is L < L 1 C is the speed of light, τ p The pulse width of the seed light after the double-pass amplification, n is the refractive index of the stimulated Brillouin scattering medium, D is the thickness of the window mirror glass, and alpha' is the refraction angle of the front surface of the window mirror.
As shown in fig. 5, in order to reduce the influence of the reflected light on the spatial energy distribution of the output Stokes light and avoid the damage of the front window mirror due to laser focusing, the tilt angle β of the window mirror should satisfy the following constraint condition:
wherein the included angle between the third polarizer 6-1 and the horizontal direction is brewster angle theta, and is used for outputting linear polarized light with high beam quality.
As shown in FIG. 6, incident light enters the window mirror along the incident angle α, and the optically denser medium is incident on the window mirror to generate a refraction angle α' satisfying N 1 sinα＝N 2 sin α'; emergent light on the rear surface of the window mirror enters the Brillouin medium pool 6-4 along the angle alpha ', the optically denser medium enters the optically thinner medium, and the refraction angle alpha' on the rear surface of the window mirror meets the N 2 sinα＜＝N 3 sin alpha ', the included angle between the incident light in the Brillouin medium pool 6-4 and the horizontal direction is (pi/2-beta-alpha').
Incident light is reflected on the rear surface of the window mirror after being refracted on the front surface of the window mirror and entering the glass, and is finally refracted and output by the front surface, wherein the incidence rate R and the refractive index T of the front surface are respectively as follows:
wherein N is 1 Is refractive index of air, N 2 Is the refractive index of the glass. And calculating the loss generated when the window mirror enters the Brillouin medium pool through the R and the T.
To sum up, the utility model provides a narrow pulse width laser of high repetition frequency high beam quality, the electro-optical Q-switched resonant cavity produces high repetition frequency linear polarization light, utilizes MOPA + SBS-PCM's amplification means, has realized the narrow pulse width laser pulse output of high repetition frequency, high beam quality.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The narrow pulse width laser with high repetition frequency and high beam quality is characterized in that: the device comprises an electro-optic Q-switching resonant cavity (1), a double-pass amplification module (3), a first one-half wave plate (4) and a light beam quality optimization module (6) which are sequentially arranged, wherein the central points of the electro-optic Q-switching resonant cavity (1), the double-pass amplification module (3), the first one-half wave plate (4) and the light beam quality optimization module (6) are on the same horizontal line; the electro-optical Q-switched resonant cavity (1) generates high repetition frequency linearly polarized seed light, the seed light enters the double-pass amplification module (3) for power amplification, and then enters the beam quality optimization module (6) to generate narrow pulse width laser pulses with high beam quality.
2. The high repetition rate high beam quality narrow pulse width laser of claim 1, further comprising: a first optical isolator (2) is arranged between the electro-optical Q-switching resonant cavity (1) and the double-pass amplification module (3), and the central points of the electro-optical Q-switching resonant cavity (1), the first optical isolator (2) and the double-pass amplification module (3) are arranged on the same horizontal line;
a second optical isolator (5) is arranged between the first one-half wave plate (4) and the light beam quality optimization module (6), and the central points of the first one-half wave plate (4), the second optical isolator (5) and the light beam quality optimization module (6) are arranged on the same horizontal line;
the first optical isolator (2) and the second optical isolator (5) are respectively composed of a polarizer, a Faraday rotator and a half wave plate which are arranged in sequence.
3. The high repetition rate high beam quality narrow pulse width laser of claim 2, further comprising: the electro-optical Q-switching resonant cavity (1) comprises a first 0-degree total reflector (1-1), an electro-optical Q-switching switch (1-2), a first polarizer (1-3), a first LD side pump module (1-4) and an output mirror (1-5) which are sequentially arranged, the central points of the first 0-degree total reflector (1-1), the electro-optical Q-switching switch (1-2), the first polarizer (1-3), the first LD side pump module (1-4) and the output mirror (1-5) are on the same horizontal line, and seed light is output by the output mirror (1-5) and enters a first optical isolator (2).
4. The high repetition frequency high beam quality narrow pulse width laser of claim 3, further comprising: the double-pass amplification module (3) comprises a second polarizer (3-1), a first single-pass amplifier (3-2), a first quarter-wave plate (3-3) and a second 0-degree total reflector (3-4), wherein the center points of the second polarizer (3-1), the first single-pass amplifier (3-2), the first quarter-wave plate (3-3) and the second 0-degree total reflector (3-4) are on the same horizontal line;
after passing through the first single-pass amplifier (3-2) and the first quarter-wave plate (3-3), the seed light is reflected by the second 0-degree total reflection mirror (3-4), the double-pass amplification of the seed light is realized through the first single-pass amplifier (3-2), and finally the high-energy seed light is output from the second polarizer (3-1).
5. The high repetition frequency high beam quality narrow pulse width laser of claim 4, further comprising: the second 0-degree total reflection mirror (3-4) is coated with a total reflection film, and forms an included angle of 90 degrees with incident light, so that total reflection of seed light is realized.
6. The high repetition rate high beam quality narrow pulse width laser defined in any one of claims 2-5, wherein: the light beam quality optimization module (6) comprises a third polarizer (6-1), a second quarter wave plate (6-2), a first positive lens (6-3) and a Brillouin medium pool (6-4), wherein the center points of the third polarizer (6-1), the second quarter wave plate (6-2), the first positive lens (6-3) and the Brillouin medium pool (6-4) are on the same horizontal line.
7. The high repetition rate high beam quality narrow pulse width laser of claim 6, further comprising: and a window mirror is arranged on the opposite side of the Brillouin medium pool (6-4), the window mirror has an inclination angle with the horizontal direction, and the centers of the window mirror and the first positive lens (6-3) are on the same horizontal line.
8. The high repetition rate high beam quality narrow pulse width laser of claim 7, further comprising: the third polarizer (6-1) is coated with an optical polarizing film and has an angle of Brewster's angle with respect to the horizontal directionθ。
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