CN220066399U - Pulse time sequence adjustable laser generating device - Google Patents

Abstract

The utility model relates to a laser generating device with adjustable pulse time sequence, which comprises a time sequence controller, a driving power supply, a pumping source, a beam collimation and shaping lens group, a beam combiner, a coupling lens group, a laser cavity mirror, a laser medium, a Q-switch and a laser output coupling mirror. The output ports of the time schedule controller are connected with the input ports of the driving power supplies and are used for generating a plurality of trigger signals and sending each trigger signal to the corresponding driving power supply, and each driving power supply is connected with one pumping source. The utility model has the advantages of compact structure, easy integration and programmable control of pulse train working mode in time sequence, wherein, by adding the time and sequence adjusting function of the electric modulation signal, the utility model carries out time-sharing pulse pumping to a plurality of pumping sources with different wavelengths or a plurality of pumping sources with the same wavelength, and a Q-switched device is used in a laser cavity to generate a plurality of laser pulse sequences, thereby breaking through the problem that the pulse train laser time sequence is difficult to control accurately and effectively expanding the application field of the pulse train laser.

Description

Pulse time sequence adjustable laser generating device

Technical Field

The utility model belongs to the technical field of lasers, relates to a laser generating device with adjustable pulse time sequence, in particular to a laser technology capable of controlling the number of generated laser pulse trains and the time sequence among the pulse trains during laser oscillation, and the laser pulse trains with the characteristics can be controlled by programming, and are compact in structure, easy to integrate and expandable.

Background

Diode Pumped Solid State Lasers (DPSSL) are currently the most efficient laser technology in achieving large pulse energy and high repetition rate output, mainly for applications: laser processing, laser diagnosis, photoelectric countermeasure, remote laser radar, and the like. Because the high repetition frequency laser pulse and the laser pulse output energy boost have a mutual restriction relationship, the pulse train laser pulse output working mode is proposed and applied to practice, and the method has the following maximum advantages: while ensuring the constant average power, the output of high repetition frequency and high energy of the sub-pulses in the pulse train is considered.

The pulse pump Q-switched method is one of the main stream modes of pulse train output, and has the advantages of low thermal effect, simple structure, and capability of adjusting the inside of the cavity so as to greatly improve the utilization rate of the inside of the cavity.

In the laser oscillator, a pumping source is used for pumping the laser gain medium to generate particle number inversion, wherein the central wavelength and bandwidth of the emission spectrum of the pumping source correspond to those of the absorption spectrum of the laser medium, so that the laser medium obtains optimal pumping light absorption efficiency. For a gain medium, there are typically multiple gain absorption bands at different wavelengths, such as: YAG laser medium has gain absorption spectral bands with center wavelengths of 808nm and 885nm respectively. The center wavelength of the emission spectrum of the pumping source commonly adopted by the traditional pulse train laser corresponds to a certain gain absorption wavelength of a laser medium, a Q-switched device is used in a laser cavity to generate a continuous output laser pulse sequence, and the control output of the pulse train laser is realized by adjusting the pumping pulse width and the frequency of a subsequent laser pulse amplifier, so that the periodic pulse train output by a laser system usually only comprises a pulse train with single characteristic, and the application of the pulse train laser in the fields of precision laser processing and manufacturing, laser material processing and the like is limited.

Disclosure of Invention

The utility model aims to provide a laser generating device with adjustable pulse time sequence, which has the advantages of compact structure, easy integration and expansibility in time domain programmable control pulse train working mode.

The aim of the utility model is achieved by the following technical scheme.

A laser generating device with adjustable pulse time sequence comprises a time sequence controller, a driving power supply, a pumping source, a beam collimation and shaping lens group, a beam combiner, a coupling lens group, a laser cavity mirror, a laser medium, a Q-switch and a laser output coupling mirror.

The output port of the time sequence controller is connected with the input port of the driving power supply and is used for generating a trigger signal and sending the trigger signal to the driving power supply for controlling the pumping source; wherein, the driving power supply adopts a pulse driving power supply; the trigger signal is a pulse electric signal and comprises a pumping trigger signal and a Q-switched trigger signal.

The output ports of the time sequence controller are multiple, and can simultaneously generate multiple trigger signals, the trigger signals are connected with the input ports of the multiple driving power supplies, each trigger signal is sent to the corresponding driving power supply, each driving power supply is connected with one pumping source, and the driving power supply acts on the corresponding pumping source according to the received trigger signals; each pumping source corresponds to one beam collimation and shaping lens group, each beam collimation and shaping lens group corresponds to one beam combiner, and the beam combiners, the coupling lens groups, the laser cavity mirrors, the laser medium, the Q-switch and the laser output coupling mirrors are sequentially arranged in the machine body.

And the driving power supply is used for acting on the pumping source according to the received trigger signal.

Further, the timing controller periodically sends a synchronous trigger signal to the driving power supply, and the synchronous output signal has the characteristics of adjustable pulse width and adjustable frequency, so that the action time of the driving power supply on the pumping source is delayed, and the time interval is adjustable.

Further, the timing controller may be a multi-channel signal generator, or may be a circuit designed by a field programmable gate array (Field Programmable Gate Array, abbreviated as FPGA). The time sequence controller is also connected with a temperature control device for monitoring and controlling the temperature of the pumping source.

Further, the pump source is a pump source forming a long pulse pump pulse. For a gain medium, there are typically multiple gain absorption bands at different wavelengths, so the pump source may be multiple pump sources at different wavelengths or multiple pump sources at the same wavelength, and the pump sources may have different polarization states, which may be changed to some extent by the pump sources. And the pumping source is used for executing a control instruction of the pumping trigger signal and applying pumping pulse to the laser medium.

Further, the beam collimating and shaping lens group can be composed of a plurality of lenses such as a spherical lens, an aspherical lens, a cylindrical lens, a plane lens and the like. Wherein, each pump source corresponds to a beam collimation and shaping lens group. The light inlet side of the beam collimation and shaping lens group is arranged behind the light outlet side of the pumping source and is used for carrying out beam shaping on pumping pulse laser, and the collimated light is formed after being shaped by the lens group, so that the light passing efficiency is improved, and the beam divergence angle is reduced. The beam collimating lens group is generally composed of lenses with different refractive indexes and curvatures, and the lenses focus and modulate the pumping beam according to the curvatures and positions of the lenses, so that uniformity and stability of the beam in the transmission process are ensured.

Furthermore, the beam combiner combines multiple paths of pump light pulses from different directions, which are shaped and collimated by the beam collimating and shaping lens group, into one path of laser, and converts the laser into a single beam with an accurate direction. The type of combiner is selected based on the characteristics of the pump source. When the beam combiner is a dispersive element, the beam combiner can be an optical element with dispersion capability, such as a prism, a Brewster angle prism, a diffraction grating, a reflection grating, a crystal with an asymmetric structure, and the like, and pump light with different wavelengths from different directions is combined in one light passing direction, so that the pump light can be combined as required in practical application, and the pump light can be combined as required, depending on the problems of a pump wavelength range, refractive index, reflectivity, diffraction efficiency, precision and the like which need to be separated; when the beam combiner is an optical fiber beam combiner, the pump light from different directions is coupled together by utilizing refraction and total reflection of the optical fiber and is transmitted through the tail part of the optical fiber; when the beam combiner is a polarization beam splitter, the beam combiner can be a polarization beam splitter prism, an optical fiber coupling output polarization beam splitter (beam combiner) and the like, and pump light with different polarization states in different directions can be combined and output in one path of optical channel; when the beam combiner is a 45-degree dichroic mirror with the front and rear surfaces respectively coated with high-transmittance and high-reflection films corresponding to the pumping wavelength, the pumping light with different wavelengths in different directions can be combined in the same optical path to be output.

Further, the light inlet side of the coupling lens group is arranged behind the light outlet side of the pump beam combiner and is used for collimating and adjusting the size of the pump pulse laser incident to the laser medium, so that the adjusted size of the pump pulse laser is matched with the laser fundamental mode in the laser resonant cavity. The coupling lens group includes a convex lens and a concave lens, and may be a combination of a convex lens and a convex lens, or a combination of a convex lens and a concave lens.

Further, the laser cavity mirror is used for transmitting the pump light and reflecting the laser generated by the laser medium.

Further, the laser medium is configured to provide a gain region for the pump pulse according to the pump trigger signal. Laser media include, but are not limited to, crystalline materials, laser crystals that may also be singly doped, bonded or glued with rare earth ions, glass, ceramics, optical fibers, dyes, titanium sapphire, and the like.

Further, the Q-switch is configured to perform Q-switching on the pump pulse laser oscillated after gain according to the Q-switching trigger signal, so as to obtain a pulse train laser output.

Further, the laser output coupling mirror is used for transmitting laser generated by the laser medium and reflecting pump light.

Furthermore, under the action of the time sequence controller, the pump sources have time delay on pumping of the laser medium, corresponding to the generated pulse train laser, and the time interval between the pulse train lasers is determined by the time interval between the pump sources.

Furthermore, the pump source performs programming control on the number of sub-pulses in the output pulse train laser, the pulse delay among the sub-pulses and the like by controlling the working period, the duty ratio and the synchronous time sequence of the pump source under the preset algorithm in the time sequence controller, and finally, the purpose of randomly adjusting the output of the pulse laser is realized.

Compared with the prior art, the utility model has the following advantages:

1. the utility model has compact structure, reasonable design, easy integration and programmable control of the working mode of the pulse train in time sequence.

2. The utility model relates to a pulse pumping Q-switched pulse train laser capable of expanding wavelength, which can break through the problem that the pulse train laser time sequence is difficult to control accurately.

3. The utility model can perform time-sharing pulse pumping on a plurality of pumping sources with different wavelengths or a plurality of pumping sources with the same wavelength by adding the time and sequence adjusting function of the electric modulation signal, and a plurality of laser pulse sequences are generated in the laser cavity by using the Q-switching device, so that the problem that the laser time sequence of the pulse sequence is difficult to control accurately can be broken through, and the accurate control of the interval distribution of sub-pulses in the pulse sequence is further realized.

4. The utility model can effectively expand the application field of the pulse train laser.

The pulse train laser of the utility model adopts a plurality of pumping sources with different wavelengths or a plurality of pumping sources with the same wavelength to perform time-sharing pulse pumping, a Q-switched device is used in a laser cavity to generate a plurality of laser pulse sequences, and the sequence time sequence of each sequence can be controlled. The pulse time sequence adjustable laser can obtain more accurate and efficient laser output by adjusting parameters such as time interval, pulse width, repetition frequency and the like of laser, and is used in various research and application fields, for example: the method can be used for micromachining, surface modification and the like in the fields of material processing and manufacturing; the method can be used for improving resolution and communication bandwidth in the fields of laser display, optical communication and the like; in the life science and medical field, the imaging device can be used for shooting biological systems with high-speed dynamic changes, such as heart and the like, and can also be used for stripping, phototherapy, cutting, analysis and the like; in addition, the method has important application value for the fields of optical measurement and optoelectronics, the research of terahertz time-domain optics and the like.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following description will refer to the drawings used in the embodiments or the prior art as needed.

FIG. 1 is a schematic diagram of a conventional laser device for generating pulse trains by extracavity modulation;

in the figure, the P1-oscillating stage driving power supply; p2-amplifier stage driving power supply; l1-an oscillating stage pump source; l2-an amplifier stage pump source; c1-an oscillating stage coupling lens group; c2-an amplifying stage coupling lens group; m1-oscillating stage endoscope; m2-oscillating stage output coupling mirror; g 1-an oscillating stage gain medium; g 2-an amplifier stage gain medium; a Q-switching device; syn-external control circuit.

FIG. 2 is a timing diagram of a pulse train laser generated by conventional extracavity modulation;

FIG. 3 is a schematic diagram of a laser device for generating pulse trains by the pulse pump Q-switched method of the present utility model;

in the figure, a P-pulse type driving power supply; an L-pump source; a C-coupling lens group; m1-a laser cavity mirror; g-laser medium; a Q-switching device; m2-output coupling mirror.

FIG. 4 is a timing diagram of the pulse pump Q-switched method of the present utility model for generating pulse train laser;

FIG. 5 is a schematic diagram of a laser with adjustable pulse sequence according to an embodiment of the present utility model;

in the figure, 1-a timing controller; 11. 21 … n 1-drive power supply; 12. 22 … n 2-pump source; 13. 23 … n 3-beam collimating and shaping lens group; 2-beam combiners; 3-coupling lens groups; 4-laser cavity mirror; 5-laser medium; 6-modulating Q device; 7-output coupling mirror.

Fig. 6 is a schematic structural diagram of an embodiment 1 of a laser with adjustable pulse timing according to the present utility model.

Fig. 7 is a schematic structural diagram of an embodiment 2 of a laser with adjustable pulse timing according to the present utility model.

Fig. 8 is a schematic structural diagram of an embodiment 3 of a laser with adjustable pulse timing according to the present utility model.

Fig. 9 is a schematic structural diagram of an embodiment 4 of a laser with pulse timing control according to the present utility model.

Detailed Description

For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail hereinafter with reference to the accompanying drawings, wherein the exemplary embodiments and descriptions of the present utility model are provided for explaining the present utility model, but not limiting the present utility model.

As described above, the starting point of the utility model for a pulse time sequence adjustable laser generating device is to realize time sequence adjustment for pulse train laser based on pulse pumping Q-switching method, so as to design a laser with reasonable design, compact structure, easy integration and programmable control of time sequence pulse train working mode, so as to meet the application requirements of the related fields.

FIG. 1 is a schematic diagram of a specific embodiment of a conventional laser apparatus for generating pulse trains by extracavity modulation, including a P1-oscillating stage driving power source; p2-amplifier stage driving power supply; l1-an oscillating stage pump source; l2-an amplifier stage pump source; c1-an oscillating stage coupling lens group; c2-an amplifying stage coupling lens group; m1-oscillating stage endoscope; m2-oscillating stage output coupling mirror; g 1-an oscillating stage gain medium; g 2-an amplifier stage gain medium; a Q-switching device; a Syn-external control circuit, wherein:

after the external control circuit Syn sends a trigger signal to the oscillating stage, the oscillating stage driving circuit P1 drives the oscillating stage pumping source L1 to execute a control instruction of the pumping signal, and pumping pulses with lower frequency and longer pulse width are generated, and the pumping pulses change the size of light spots through the oscillating stage coupling lens group C1, so that the mode matching is better carried out on the pumping pulses and the laser radius in the oscillating stage gain medium g1 in the resonant cavity, and oscillation light is generated. After the oscillation stage pump source starts to work, the Q-switched medium generates narrow pulse width Q-switched laser sequences by turning on the Q-switched switch for a plurality of times, and the frequencies of the Q-switched laser sequences are the frequencies corresponding to the pump trigger signals.

Further, after the oscillation stage generates the narrow pulse laser sequence, the amplification stage pump pulse size is adjusted to be consistent with the spot size of the oscillation stage narrow pulse laser by the amplification stage coupling lens group C2, and then the narrow pulse is amplified by the amplification stage with the adjusted size, so that the narrow pulse in the pulse train mode is obtained. The amplifying stage pump source L2 is controlled by the external control circuit Syn to be synchronous with the oscillating stage pump source L1, so that the maximum pump efficiency is realized.

Fig. 2 shows a timing diagram of a conventional extracavity modulation generated pulse train laser, illustrating the oscillating stage Q-switched pulse train and amplifying stage pulse train laser output timing diagram. It can be seen that the Q-switched device is used in the laser cavity to generate a continuous output laser pulse sequence, and the pumping pulse width and frequency of the subsequent laser pulse amplifier are adjusted to realize the control output of the laser of the extra-cavity pulse train, so that the periodic pulse train output by the laser system generally only comprises a pulse train with single characteristic and has lower output efficiency.

FIG. 3 is a schematic diagram of a pulse pump Q-switched laser apparatus for generating pulse trains, which is a highly efficient pulse train generation scheme for pulse pump combined with intracavity modulation, comprising, a P-pulse driving power supply; an L-pump source; a C-coupling lens group; m1-a laser cavity mirror; g-laser medium; a Q-switching device; m2-output coupling mirror, wherein: the pumping source L forms long pulse pumping under the drive of the pulse driving power supply P, the Q-switching medium is inserted into the resonant cavity, and the flexible selection of pulse train laser is realized by controlling the pumping time and energy of the pumping source and the working state of the Q-switching medium.

Fig. 4 is a timing diagram of pulse pump Q-switched method for generating pulse train laser, which shows that the pulse train laser has the advantage of flexible and controllable pulse train laser parameters compared with the extracavity modulation of pulse train laser output.

The center wavelength of the pump source emission spectrum generally used for the pulse train generated by the conventional extra-cavity modulation pulse train generation method or the pulse pump Q-switching method corresponds to a certain gain absorption wavelength of the laser medium, so that the periodic pulse train output by the laser system generally only comprises a pulse train with a single characteristic.

Fig. 5 is a schematic diagram of a laser structure with adjustable pulse timing sequence provided in an embodiment of the present utility model, on the basis of flexible selection of pulse train laser by a pulse pumping Q-switching method, multiple pump sources with different wavelengths or multiple pump sources with the same wavelength are used for time-sharing pulse pumping, multiple laser pulse sequences are generated in a laser cavity by using a Q-switching device, and the timing sequence of each sequence can be controlled. Wherein, 1-a time schedule controller; 11. 21 … n 1-drive power supply; 12. 22 … n 2-pump source; 13. 23 … n 3-beam collimating and shaping lens group; 2-beam combiners; 3-coupling lens groups; 4-laser cavity mirror; 5-laser medium; 6-modulating Q device; 7-output coupling mirror.

The time sequence controller is provided with a plurality of output ports, can simultaneously generate a plurality of trigger signals, is connected with the input ports of a plurality of driving power supplies, and transmits each trigger signal to a corresponding driving power supply, each driving power supply is connected with one pumping source, and the driving power supply acts on the corresponding pumping source according to the received trigger signals; each pumping source corresponds to one beam collimation and shaping lens group, each beam collimation and shaping lens group corresponds to one beam combiner, and the beam combiners, the coupling lens groups, the laser cavity mirrors, the laser medium, the Q-switch and the laser output coupling mirrors are sequentially arranged in the machine body.

And the driving power supply is used for acting on the pumping source according to the received trigger signal. The driving power supply adopts a pulse driving power supply.

The timing controller may generate a series of different timing signals according to preset rules to ensure that various portions of the circuit operate at a specified timing. Meanwhile, the timing controller 1 is provided with a plurality of output ports connected to the input ports of the driving power sources 11, 21 … n1 for generating a plurality of trigger signals and transmitting the trigger signals to the driving power sources 11, 21 … n1 for controlling the pump sources 12, 22 … n2.

The trigger signal is a pulse electric signal and comprises a pumping trigger signal and a Q-switched trigger signal. The timing controller 1 periodically sends a synchronous trigger signal to the driving power supply 11, 21 … n1, and the synchronous output signal has the characteristics of adjustable pulse width and adjustable frequency, so that the action time of the driving power supply 11, 21 … n1 on the pump source 12, 22 … n2 is delayed, and the time interval is adjustable.

The timing controller may be a multi-channel signal generator or a circuit designed by a field programmable gate array (Field Programmable Gate Array, abbreviated as FPGA). The time sequence controller is also connected with a temperature control device for monitoring and controlling the temperature of the pumping source.

The pump sources 12, 22 … n2 are used for executing control instructions of the pump trigger signal to apply pump pulses into the laser medium 5. The pump sources 12, 22, … n2 are pump sources that form long-pulse pump pulses. For a gain medium, there are typically multiple gain absorption bands of different wavelengths, so that pump sources 12, 22 … n2 can be multiple pump sources of different wavelengths or multiple pump sources of the same wavelength, and their polarization states can also be changed. The pump sources may have different polarization states.

The light-entering side of the beam collimating and shaping lens group 13, 23 … n3 is arranged behind the light-exiting side of the pump source 12, 22 … n2, and is used for improving the focusing degree and the transverse width of the pump pulse laser, so that the efficiency and the stability of the pump light are improved. The beam collimating lens group is generally composed of lenses with different refractive indexes and curvatures, and the lenses focus and modulate the pumping beam according to the curvatures and positions of the lenses, so that uniformity and stability of the beam in the transmission process are ensured. The beam collimation and shaping lens group comprises a spherical lens, an aspherical lens, a cylindrical mirror, a plane mirror and other combinations.

The beam combiner 2 combines the multiple pump light pulses which are shaped and collimated by the beam collimating and shaping lens groups 13 and 23 … n3 into one laser. The type of combiner 2 is selected based on the characteristics of the pump sources 12, 22 … n2. For example: when the beam combiner is a dispersion element, a prism and a grating can be adopted to combine pump light with different wavelengths from different directions in a light passing direction; when the beam combiner is an optical fiber beam combiner, the optical fibers can couple pump light from different directions into one optical fiber for output; the free space beam combiner composed of a lens and a reflecting mirror focuses the dispersed pump light on a point, thereby enhancing the directivity of the light beam and outputting the light beam in the same light path direction; the polarization beam splitter can combine pump light with different polarization states in different directions into one path of light channel for output; for pump light with different wave bands, the pump light with different wavelengths in different directions is combined in the same light path and output through the 45-degree dichroic mirror with the front and rear surfaces respectively coated with the high-transmittance and high-reflection films with corresponding wavelengths.

The light-in side of the coupling lens group 3 is arranged behind the light-out side of the pump beam combiner 2, and is used for collimating and adjusting the size of the pump pulse laser incident to the laser medium 5, so that the adjusted size of the pump pulse laser is matched with the laser fundamental mode in the laser resonant cavity. The coupling lens group comprises a convex lens and a concave lens, and can be a convex lens and a convex lens or a convex lens and concave lens combination.

The laser cavity mirror 4 is used for transmitting pump light and reflecting laser light generated by the laser medium 5.

The laser medium 5 is arranged to provide a gain region for the pump pulse in dependence of the pump trigger signal. The laser medium includes but is not limited to crystal material, laser crystal of single doped, bonded or glued rare earth ion, glass, ceramic, optical fiber, dye, titanium sapphire, etc.

The Q-switching device 6 is configured to perform Q-switching on the pump pulse laser oscillated after gain according to the Q-switching trigger signal, so as to obtain a pulse train laser output. The Q device may be an active Q device or a passive Q medium.

The output coupling mirror 7 is used for transmitting the laser light generated by the laser medium 5 and reflecting the pump light.

Under the action of the time schedule controller 1, the pump sources 12, 22 … n2 have time delay on the pumping of the laser medium 5 by the pump sources 12, 22 … n2, corresponding generated pulse train lasers have time delay, and the time interval between the pulse train lasers is determined by the time interval between the pump sources 12, 22 … n2.

Under the preset algorithm in the time sequence controller 1, the working period, the duty ratio and the synchronous time sequence of the pump sources 12 and 22 … n2 are controlled, so that the number of sub-pulses in the output pulse train laser, the pulse time delay among the sub-pulses and the like are controlled, and the purpose of randomly adjusting the output of the pulse laser is finally realized.

Example 1:

referring to fig. 6, fig. 6 is a schematic diagram of a laser structure with adjustable pulse timing of a combined dispersive element pumped by multiple pump sources with different wavelengths according to the present utility model.

In the figure, 1-a timing controller; 11. 21, 31-driving power supply; 12. 22, 32-pump sources; 13. 23, 33-a beam collimating and shaping lens group; a 2-dispersion element; 3-coupling lens groups; 4-laser cavity mirror; 5-laser medium; 6-modulating Q device; 7-output coupling mirror.

The timing controller 1 sends the generated periodic synchronous trigger signal to the driving power supply 11, 21, 31, so that the driving power supply 11, 21, 31 has time delay on the acting time of the pump source 12, 22, 32, and the time interval is adjustable, thereby controlling the pump source 12, 22, 32. The pump sources 12, 22, 32 are then used to execute control instructions of the pump trigger signal to apply pump pulses into the laser medium 5. The pump sources 12, 22, 32 are pump sources of pulses with different wavelengths, and the gain medium 5 can absorb and laser the pump wavelengths. The beam collimating and shaping lens groups 13, 23 and 33 perform beam shaping on the pumping pulse laser, and collimated light is formed after the beam shaping through the lens groups, so that the light transmission efficiency is improved, and the beam divergence angle is reduced. The dispersive element 2 synthesizes three paths of scattered pump light pulses with different wavelengths, which are shaped and collimated by the beam collimating and shaping lens groups 13, 23 and 33, into one path of laser. The dispersive element 2 may be an optical element with dispersion capability, such as a prism, a brewster angle prism, a diffraction grating, a reflection grating, a crystal with an asymmetric structure, etc., and in practical application, the dispersive elements may be combined as required, and the application of different dispersive elements depends on the wavelength range, refractive index, reflectivity, diffraction efficiency, accuracy, etc. that need to be separated. The coupling lens group 3 is used for collimating and sizing the pump pulse laser light incident on the laser medium 5. The laser cavity mirror 4 is used for transmitting pump light and reflecting laser light generated by the laser medium 5. The laser medium 5 is used to provide a gain region for the pump pulses, creating a lasing under time-shared pumping of the three pump pulses. The Q-switching device 6 is configured to perform Q-switching on the lasing laser according to the Q-switching trigger signal, so as to obtain a pulse train laser output. The output coupling mirror 7 is used for transmitting the laser light generated by the laser medium 5 and reflecting the pump light.

Example 2:

referring to fig. 7, fig. 7 is a schematic diagram of a laser structure with adjustable pulse timing of a combined fiber combiner pumped by multiple pump sources according to the present utility model.

In the figure, 1-a timing controller; 11. 21 … n 1-drive power supply; 12. 22 … n 2-pump source; 13. 23 … n 3-beam collimating and shaping lens group; 2-optical fiber combiner; 3-coupling lens groups; 4-laser cavity mirror; 5-laser medium; 6-modulating Q device; 7-output coupling mirror.

The timing controller 1 sends the generated periodic synchronous trigger signal to the driving power supply 11, 21 … n1, so that the driving power supply 11, 21 … n1 delays the acting time of the pump source 12, 22 … n2, and the time interval is adjustable, thereby controlling the pump source 12, 22 … n2. The pump sources 12, 22 … n2 are then used to execute control commands of the pump trigger signal to apply pump pulses into the laser medium 5. The pump sources 12, 22 … n2 are pulsed pump sources. The beam collimation and shaping lens groups 13 and 23 … n3 are used for carrying out beam shaping on the pumping pulse laser, and the pumping pulse laser is coupled into the transmission optical fiber after being shaped by the lens groups. The optical fiber combiner 2 combines the multiple pump light transmission optical fibers into one optical fiber for output. The coupling lens group 3 is used for collimating and sizing the pump pulse laser light incident on the laser medium 5. The laser cavity mirror 4 is used for transmitting pump light and reflecting laser light generated by the laser medium 5. The laser medium 5 is used to provide a gain region for the pump pulses, forming a lasing under time-shared pumping of the various pump pulses. The Q-switching device 6 is configured to perform Q-switching on the lasing laser according to the Q-switching trigger signal, so as to obtain a pulse train laser output. The output coupling mirror 7 is used for transmitting the laser light generated by the laser medium 5 and reflecting the pump light.

Example 3:

referring to fig. 8, fig. 8 is a schematic diagram of a laser structure with adjustable pulse timing under pumping of different polarization states or different wavelength pumping sources according to the present utility model.

In the figure, 1-a timing controller; 11. 21-a driving power supply; 12. 22-a pump source; 13. 23-a beam collimation shaping lens group; 2-beam splitters; 3-coupling lens groups; 4-laser cavity mirror; 5-laser medium; 6-modulating Q device; 7-output coupling mirror.

The timing controller 1 sends the generated periodic synchronous trigger signal to the driving power supply 11, 21, so that the driving power supply 11, 21 delays the acting time of the pump source 12, 22, and the time interval is adjustable, thereby controlling the pump source 12, 22. The pump sources 12, 22 are then used to execute control instructions of the pump trigger signal to apply pump pulses into the laser medium 5. The pump sources 12, 22 may be pulsed pump sources of different polarization states or pulsed pump sources of different wavelengths. The beam-collimating and shaping lens groups 13 and 23 perform beam shaping on the pump pulse laser, and collimated light is formed after shaping by the lens groups. The beam splitter 2 combines the two paths of shaped and collimated pump light pulses into the same optical channel for output, wherein when the pump light with different polarization states is incident, the beam splitter 2 is a polarization beam splitter, light is combined into a single optical channel for output according to the polarization states of the input pump light of the two channels, and the beam splitter 2 can be a polarization beam splitter prism, an optical fiber coupling output polarization beam splitter (beam combiner) and the like; when pump light with different wavelengths is incident, the beam splitter 2 is a 45-degree dichroic mirror, and one wavelength is highly transparent and the other wavelength is highly reflective, so that the pump light with different wavelengths is combined into one light output. The coupling lens group 3 is used for collimating and sizing the pump pulse laser light incident on the laser medium 5. The laser cavity mirror 4 is used for transmitting pump light and reflecting laser light generated by the laser medium 5. The laser medium 5 is used to provide a gain region for the pump pulses, forming a lasing under time-shared pumping of the various pump pulses. The Q-switching device 6 is configured to perform Q-switching on the lasing laser according to the Q-switching trigger signal, so as to obtain a pulse train laser output. The output coupling mirror 7 is used for transmitting the laser light generated by the laser medium 5 and reflecting the pump light.

In the specific embodiment of the pulse laser, the pumping directions of the two pumping sources are approximately vertical, and the laser crystal adopts an end pumping mode, so that the volume of the solid laser can be reduced, and the miniaturization and the low cost are easier to realize.

Example 4:

referring to fig. 9, fig. 9 is a schematic diagram of a laser structure with adjustable pulse timing under pumping of pump sources with different polarization states and different wavelengths according to the present utility model.

In the figure, 1-a timing controller; 11. 21, 31-driving power supply; 12. 22, 32-pump sources; 13. 23, 33-a beam collimating and shaping lens group; 2, a beam combiner and a 20-beam splitter; 3-coupling lens groups; 4-laser cavity mirror; 5-laser medium; 6-modulating Q device; 7-output coupling mirror.

The timing controller 1 sends the generated periodic synchronous trigger signal to the driving power supply 11, 21, 31, so that the driving power supply 11, 21, 31 has time delay on the acting time of the pump source 12, 22, 32, and the time interval is adjustable, thereby controlling the pump source 12, 22, 13. The pump sources 12, 22, 13 are then used to execute control commands of the pump trigger signals to apply pump pulses into the laser medium 5. The pump sources 12, 22 are pulse pump sources with different polarization states, and the pump sources 12, 32 are pulse pump sources with different wavelengths. The beam-collimating and shaping lens groups 13, 23, 33 perform beam shaping on the pump pulse laser, and form collimated light after being shaped by the lens groups. The beam splitter 2 is a polarization beam splitter, the beam splitter 20 is a 45-degree dichroic mirror, and the two beam splitters respectively combine the shaped and collimated pump light pulses into the same light channel for output. The coupling lens group 3 is used for collimating and sizing the pump pulse laser light incident on the laser medium 5. The laser cavity mirror 4 is used for transmitting pump light and reflecting laser light generated by the laser medium 5. The laser medium 5 is used to provide a gain region for the pump pulses, forming a lasing under time-shared pumping of the various pump pulses. The Q-switching device 6 is configured to perform Q-switching on the lasing laser according to the Q-switching trigger signal, so as to obtain a pulse train laser output. The output coupling mirror 7 is used for transmitting the laser light generated by the laser medium 5 and reflecting the pump light.

The foregoing is merely a preferred embodiment of the utility model, and examples of the utility model are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Any omission, modification, equivalent replacement, improvement, modification, etc. made by those skilled in the art without departing from the technical principles of the present utility model should be included in the protection scope of the present utility model.

For example:

(1) The pump source of the utility model is a pump source forming long pulse pump pulses. For a laser working substance having multiple gain absorption bands of different wavelengths, the pump source may be multiple pump sources of different wavelengths or multiple pump sources of the same wavelength. And the polarization state of the pump source may also be changed.

(2) The beam combiner of the present utility model may be selected based on the characteristics of the pump source. When the prism and the grating are used as beam combiners, pump light with different wavelengths from different directions can be combined in one path of light passing direction; when the optical fiber beam combiner is used as the beam combiner, pump light from different directions can be coupled into one optical fiber to be output; when the polarization beam splitter is used as a beam combiner, pump light with different polarization states in different directions can be combined and output in one path of optical channel; when the 45-degree dichroic mirrors with the high-transmittance and high-reflection films with corresponding wavelengths are respectively plated on the front surface and the rear surface of the pump light with different wave bands to serve as a beam combiner, the pump light with different wavelengths in different directions can be combined in the same optical path to be output.

(3) The Q-switching device can be an active Q-switching element or a passive Q-switching working substance, is not limited to a saturable absorber crystal, and can be any Q-switching working substance capable of meeting the requirement of having a certain absorption degree on the wavelength of laser emitted by the laser working substance.

Claims (10)

1. The utility model provides a laser generating device that pulse sequence can be regulated and control which characterized in that: the laser comprises a time sequence controller, a plurality of driving power supplies, a plurality of pumping sources, a plurality of beam collimation and shaping lens groups, a beam combiner, a coupling lens group, a laser cavity mirror, a laser medium, a Q-switch and a laser output coupling mirror; the output ports of the time schedule controller are connected with the input ports of the driving power supplies and are used for generating a plurality of trigger signals and sending each trigger signal to the corresponding driving power supply, each driving power supply is connected with one pumping source, and the driving power supply acts on the corresponding pumping source according to the received trigger signals; each pumping source corresponds to one beam collimation and shaping lens group, each beam collimation and shaping lens group corresponds to one beam combiner, and the beam combiners, the coupling lens groups, the laser cavity mirrors, the laser medium, the Q-switch and the laser output coupling mirrors are sequentially arranged in the machine body.

2. The pulse timing controllable laser generator of claim 1, wherein: the driving power supply adopts a pulse driving power supply; the trigger signal is a pulse electric signal and comprises a pumping trigger signal and a Q-switched trigger signal; the time sequence controller periodically sends a synchronous trigger signal to the driving power supply, the pulse width and the frequency of the synchronous output signal are adjustable, the action time of the driving power supply on the pumping source is delayed, and the time interval is adjustable.

3. The pulse timing controllable laser generator of claim 1, wherein: the time sequence controller is a multichannel signal generator or a circuit designed by a field programmable gate array; the time sequence controller is also connected with a temperature control device for monitoring and controlling the temperature of the pumping source.

4. The pulse timing controllable laser generator of claim 1, wherein: the pump source is a pump source for forming long pulse pump pulse; for a gain medium with a plurality of gain absorption bands with different wavelengths, the pump source is a plurality of pump sources with different wavelengths or a plurality of pump sources with the same wavelength; the polarization state of the pump source can be changed to a certain extent, and the pump source can have different polarization states; and the pumping source is used for executing a control instruction of the pumping trigger signal and applying pumping pulse to the laser medium.

5. The pulse timing controllable laser generator of claim 1, wherein: the beam collimation shaping lens group adopts a spherical lens, an aspherical lens, a cylindrical lens and a plane lens for combination; each pump source corresponds to a beam collimation and shaping lens group; the light inlet side of the beam collimation and shaping lens group is arranged behind the light outlet side of the pumping source and is used for carrying out beam shaping on pumping pulse laser, and the collimated light is formed after being shaped by the lens group, so that the light passing efficiency is improved, and the beam divergence angle is reduced.

6. The pulse timing controllable laser generator of claim 1, wherein: the beam combiner can be selected according to the characteristics of the pump source; when the beam combiner is a dispersive element, optical elements with dispersive capability such as a prism, a Brewster angle prism, a diffraction grating, a reflection grating and crystals with asymmetric structures are adopted, pump light with different wavelengths from different directions is combined in one light passing direction, and in practical application, the pump light can be combined as required, and the pump light is dependent on the pump wavelength range, refractive index, reflectivity, diffraction efficiency and accuracy problems which need to be separated; when the beam combiner is an optical fiber beam combiner, the pump light from different directions is coupled together by utilizing refraction and total reflection of the optical fiber and is transmitted through the tail part of the optical fiber; when the beam combiner is a polarization beam splitter, a polarization beam splitter prism, an optical fiber coupling output polarization beam splitter and a beam combiner can be adopted, and pump light with different polarization states in different directions can be combined and output in one path of optical channel; when the beam combiner is a 45-degree dichroic mirror with the front and rear surfaces respectively coated with high-transmittance and high-reflection films corresponding to the pumping wavelength, the pumping light with different wavelengths in different directions can be combined in the same optical path to be output; the beam combiner combines multiple paths of pump light pulses from different directions, which are shaped and collimated by the beam collimating and shaping lens group, into one path of laser, and converts the laser into a single beam with an accurate direction.

7. The pulse timing controllable laser generator of claim 1, wherein: the coupling lens group adopts a convex lens and a convex lens combination or a convex lens and a concave lens combination; the light inlet side of the coupling lens group is arranged behind the light outlet side of the pump beam combiner and is used for collimating and adjusting the size of pump pulse laser incident to the laser medium so as to match the adjusted size of the pump pulse laser with the laser fundamental mode in the laser resonant cavity.

8. The pulse timing controllable laser generator of claim 1, wherein: the laser medium adopts a crystal material, or adopts a laser crystal, glass, ceramic, optical fiber, dye and titanium sapphire which are singly doped, bonded or glued with rare earth ions; and the laser medium is used for providing a gain area for the pumping pulse according to the pumping trigger signal.

9. The pulse timing controllable laser generator of claim 1, wherein: under the action of the time sequence controller, the pumping sources have time delay on pumping of the laser medium, corresponding generated pulse train lasers have time delay, and the time interval between the pulse train lasers is determined by the time interval between the pumping sources.

10. The pulse timing controllable laser generator of claim 1, wherein: the pumping source controls the number of sub-pulses and pulse delay among the sub-pulses in the output pulse train laser by controlling the working period, the duty ratio and the synchronous time sequence of the pumping source under the action of the time sequence controller, and finally, the purpose of randomly adjusting the output of the pulse laser is realized.