NL2032229B1 - A-o q-switched solid-state laser device with adjustable pulse output and pulsed laser generation method - Google Patents

A-o q-switched solid-state laser device with adjustable pulse output and pulsed laser generation method Download PDF

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NL2032229B1
NL2032229B1 NL2032229A NL2032229A NL2032229B1 NL 2032229 B1 NL2032229 B1 NL 2032229B1 NL 2032229 A NL2032229 A NL 2032229A NL 2032229 A NL2032229 A NL 2032229A NL 2032229 B1 NL2032229 B1 NL 2032229B1
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laser
laser device
switched solid
solid state
state laser
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NL2032229A
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NL2032229A (en
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Zhao Shusen
Dong Zhiyong
Lin Xuechun
Wang Hongyang
Zhang Zhiyan
Yu Haijun
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Inst Semiconductors Cas
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1123—Q-switching
    • H01S3/117—Q-switching using intracavity acousto-optic devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10038—Amplitude control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/1068—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using an acousto-optical device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10038—Amplitude control
    • H01S3/10046—Pulse repetition rate control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10069—Memorized or pre-programmed characteristics, e.g. look-up table [LUT]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1601—Solid materials characterised by an active (lasing) ion
    • H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
    • H01S3/1611—Solid materials characterised by an active (lasing) ion rare earth neodymium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/163—Solid materials characterised by a crystal matrix
    • H01S3/164—Solid materials characterised by a crystal matrix garnet
    • H01S3/1643—YAG

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

An acoustic-optic Q-switched solid-state laser device with an adjustable pulse output and a method for generating a pulsed laser are provided. The A-O Q- switched solid-state laser device includes: an oscillation stage module, configured to continuously generate a laser; a programmable signal generator, configured to generate an analog signal; an A-O Q-switch driver, configured to receive the analog signal generated by the programmable signal generator to generate a radio frequency signal in a step shape; and an A-O Q-switch, configured to receive the radio frequency signal generated by the A-O Q-switch driver, and modulate, according to the radio frequency signal, the laser generated by the oscillation stage module to convert the laser into a pulsed laser.

Description

A-O Q-SWITCHED SOLID-STATE LASER DEVICE WITH ADJUSTABLE PULSE
OUTPUT AND PULSED LASER GENERATION METHOD
TECHNICAL FIELD
The present disclosure relates to a field of establishing a solid-state laser device, and a radio frequency (RF) signal modulation method for an acoustic-optic (A-O) Q- switch driver, and particular to an A-O Q-switched solid-state laser device with an adjustable pulse output and a pulsed laser generation method.
BACKGROUND
Double-pulsed laser is widely applied in the field of the laser-induced breakdown spectroscopy, and can be used to enhance the spectral intensity of the generated plasma, prolong the luminescence period, and improve the detection accuracy.
Meanwhile, it may also be applied in the laser medical field, such as tumor treatments and removals of calculi and gastric stones. However, there is no report on the application of the double-pulsed laser in the laser cleaning field. The reasons are as follows. A general single-pulse solid-state laser device for cleaning has disadvantages such as undesired optical fiber transmission property at a high energy level and damages to optical surfaces, and the related double-pulsed laser output system has a complex structure and is unable to realize the double-pulse or multi-pulse output with both high power and high repetition frequency. Therefore, there is a need to optimize the laser.
The related double-pulse solid-state laser devices have the following disadvantages. In a scheme where an electro-optical Q-switching device is used for changing the electro-optic effect in crystals or liquids to control and adjust the output of the double-pulsed laser, in order to control the high power laser, the operating voltage is required to be at a level of thousands of volts. Moreover, a 1/4 wave plate must be used to form a laser resonant cavity that can realize a stable laser resonance oscillation. The use of the 1/4 wave plate will greatly reduce the increase of the average laser power of the resonant cavity. In another scheme where two resonant cavities are used to output double pulses, multiple pulses cannot be output. To realize the multi-pulse output, the number of resonant cavities has to be increased, which increases the complexity of the system. Therefore, the above two schemes cannot realize the double-pulse or multi-pulse solid-state laser output with both high power (at a level of hundred(s) of watts) and high repetition frequency (at a level of kHz).
SUMMARY
Accordingly, to solve at least one of the problems that exist in the related art to at least some extent, an object of the present disclosure is to provide an A-O Q- switched solid-state laser device with an adjustable pulse output and a method for generating a pulsed laser.
In order to realize the above object, in a first aspect of the present disclosure, an A- © Q-switched solid-state laser device with an adjustable pulse output is provided, including: an oscillation stage module, configured to continuously generate a laser; a programmable signal generator, configured to generate an analog signal; an A-O
Q-switch driver, configured to receive the analog signal generated by the programmable signal generator to generate a radio frequency signal in a step shape; and an A-O Q-switch, configured to receive the radio frequency signal generated by the A-O Q-switch driver, and modulate, according to the radio frequency signal, the laser generated by the oscillation stage module to convert the laser into a pulsed laser.
In a second aspect of the present disclosure, a method for generating a pulsed laser with the A-O Q-switched solid-state laser device as described above is provided, including: generating the laser by the oscillation stage module; generating the analog signal by the programmable signal generator; receiving the analog signal by the A-O Q-switch driver to generate the radio frequency signal in the step shape; applying the radio frequency signal generated by the A-O Q-switch driver to the A-O Q-switch; converting, by a piezoelectric transducer of the A-O Q-switch, an electric energy of the radio frequency signal in the step shape info an ultrasonic energy corresponding to a respective step height and duration; and modulating, by an A-O crystal of the A-O Q-switch, a diffraction efficiency of the A-O crystal for the laser according to an intensity of the ultrasonic energy, to modulate the laser generated by the oscillation stage module to convert the laser into the pulsed laser with an adjustable sub-pulse energy, an adjustable sub-pulse number and an adjustable sub-pulse interval. lt can be seen from the above technical solutions that the A-O Q-switched solid- state laser device with the adjustable pulse output and the method for generating the pulsed laser of the present disclosure have at least one of or a part of the following beneficial effects.
With the A-O Q-switched solid-state laser device with the adjustable pulse output of the present disclosure, the analog signal generated by the programmable signal generator is applied to the A-O Q-switch driver, the A-O Q-switch driver generates the radio frequency signal in a shape of multiple steps and transmits the radio frequency signal to the A-O Q switch, the A-O Q-switch receives the radio frequency signal in the step shape and then modulates the laser generated by the oscillation stage module, so as to convert the laser into the pulsed laser having the adjustable pulse number, energy ratio and sub-pulse interval. Therefore, the A-O
Q-switched solid-state laser device is able to output the pulsed laser in which the number of sub-pulses, the energy ratio and the sub-pulse interval can be adjustable.
Based on the aforementioned adjustability and controllability of the pulsed laser output from the A-O Q-switched solid-state laser device of the present disclosure, the output of double-pulse or multi-pulse solid-state laser with both of the high power and the high repetition frequency can be realized. In a case where a damage threshold of an optical surface or an optical fiber section is fixed, the input energy can be increased by multiple times and the problems of the high energy and the damage in the application of laser cleaning can be effectively solved.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic diagram of an A-O Q-switched solid-state laser device according to an embodiment of the present disclosure;
FIG. 2 is a diagram showing a principle of outputting a double-pulsed laser from an
A-O Q-switched solid-state laser device according to an embodiment of the present disclosure;
FIG. 3 is a diagram showing a comparison between a designed RF signal waveform graph (a) and a tested RF signal waveform graph (b) according to an embodiment of the present disclosure;
FIG. 4 is a waveform graph of a double-pulsed laser according to an embodiment of the present disclosure.
Reference numerals: total reflection lens 1, oscillator stage module 2, A-O Q switch 3, laser output lens 4, beam expander Lens group 5, collimation output lens group 6 for hard optical path transmission, A-O Q-switch driver 7, programmable signal generator 8, driving power supply 9.
DETAILED DESCRIPTION
Inthe process of implementing the present invention, it is found that by optimizing the structure of the solid-state laser device, the solid-state laser device can generate a double-pulse or multi-pulsed laser, which can effectively solve the problems, such as poor optical fiber transmission at the high energy level and damages on the optical surfaces, existed in the current solid-state laser devices for cleaning.
Therefore, the present disclosure creatively provides an A-O Q-switched solid-state laser device with an adjustable pulse output and a method for generating a pulsed laser. By optimizing the structure of the solid-state laser device, the laser generated by the solid-state laser device is modulated by the A-O Q-switch to generate a pulsed laser, and further output a pulsed laser via resonance.
In order to make the objects, the technical solutions and the advantages of the present disclosure more clearly, the present invention will be further described in detail below by specific embodiments and with reference to the accompanying drawings.
In some embodiments of the present disclosure, an A-O Q-switched solid-state laser device with an adjustable pulse output is provided, including: an oscillation stage module, configured to continuously generate a laser; a programmable signal generator, configured to generate an analog signal; an A-O Q-switch driver, configured to receive the analog signal generated by the programmable signal generator to generate a radio frequency signal in a step shape; and an A-O Q- switch, configured to receive the radio frequency signal generated by the A-O Q- switch driver, and modulate, according to the radio frequency signal, the laser generated by the oscillation stage module to convert the laser into a pulsed laser. it can be understood that the A-O Q-switch is generally composed of a piezoelectric transducer, an A-O crystal (generally fused quartz) and a sound-absorbing material. Usually, the piezoelectric transducer is configured to convert an electrical energy of the radio frequency signal into an ultrasonic energy. The ultrasonic energy is applied to the A-O crystal to periodically change a refractive index of the
A-O crystal, thereby affecting the diffraction of the incident light at the crystal. When no ultrasonic wave passes, the A-O crystal is back to the high transmittance state,
the laser emits a pulse. In the present disclosure, by selecting the A-O Q-switch driver that can accept the analog signal input, the A-O Q-switch driver can output the radio frequency signal in the step shape after receiving the specific analog modulation signal. The intensity of the radio frequency signal will affect the 5 ultrasonic power applied by the piezoelectric transducer of the A-O Q-switch on the
A-O crystal, so as to affect the diffraction efficiency of the acousto-optic crystal for the laser, and thus the diffraction performance of the A-O Q-switch. Therefore, the output of the double-pulse laser or multi-pulse laser can be realized via the step- shaped RF signal modulation. In other words, by controlling the intensity of the RF signal, an intensity of Bragg diffracted light can be controlled, and two or more pulses can be output in one pumping cycle, and the sub-pulse interval can be adjusted by adjusting a width of the step of the RF signal. A sub-pulse energy ratio can be adjusted by adjusting a height ratio of the steps of the radio frequency signal. The laser device of the present disclosure has a repetition frequency of greater than 1 kHz up to 20 kHz and a sub-pulse interval ranging from 500 ns to 10
Hs, and the power can reach 100 W or more.
In some embodiments of the present disclosure, the oscillation stage module can be selected as, but not limited to, a module of 4 mm*160 mm Nd:YAG crystal rod of a LD side pump.
In some embodiments of the present disclosure, the A-O Q-switch driver has an operating frequency of 50 MHZ, and an electric pulse drop time of < 120 ns. By selecting the A-O Q-switch driver with a relatively high operating frequency, it can be ensured that the RF signal in the shape of multiple steps can be output and the optical path can be turned off. The higher the operating frequency, the stronger the turn-off capability of the A-O Q switch. Accordingly, the A-O Q-switch driver is operated at 50 MHz.
In some embodiments of the present disclosure, the A-O Q-switched solid-state laser device further includes a total reflection mirror placed on one side of the oscillation stage module and a laser output lens placed on the other side of the oscillation stage module, and the total reflection mirror and the laser output lens are arranged symmetrically and collinearly, and a resonant cavity is defined between the total reflection mirror and the laser output mirror; the A-O Q-switch is located between the oscillation stage module and the laser output lens or between the oscillation stage module and the total reflection mirror, and the pulsed laser generated by the A-O Q-switch is oscillated in the resonant cavity and output through the laser output lens. The resonant cavity has a length of 400 nm. The resonant cavity having such a length is relatively stable and has a high conversion rate. The total reflection mirror has a reflectivity of 100% for a light having a wavelength of 1064 nm.
In some embodiments of the present disclosure, the laser output lens has a laser transmittance ranging from 40% to 70%.
In some embodiments of the present disclosure, the A-O Q-switched solid-state laser device further includes: a beam expander lens group, configured to expand and shape the pulsed laser output from the laser output lens. The beam expander module can be selected according to actual needs, and can be selected as, but is not limited to, a 1:2 beam expander system composed of a spherical lens having a focal distance f of -50 mm and a spherical lens having a focal distance f of 100 mm.
In some embodiments of the present disclosure, the A-O Q-switched solid-state laser device further includes: a collimation output lens group for hard optical path transmission, configured to transmit the expanded and shaped laser output from the beam expander lens group through a hard optica! path; or a coupling lens group for optical fiber transmission, configured to couple the expanded and shaped laser ouiput from the beam expander lens group into an optical fiber for transmission.
In some embodiments of the present disclosure, the A-O Q-switched solid-state laser device further comprises: a driving power supply, configured to provide a pumping current for the oscillation stage module, so as to adjust a power of the laser generated by the oscillation stage module. In this case, the driving power supply adjusts the pumping current to adjust a pumping power of the oscillation stage module, so as to adjust the power of the laser generated by the oscillation stage module.
In some embodiments of the present disclosure, a method for generating a pulsed laser with the A-O Q-switched solid-state laser device as described above is provided, including: generating the laser by the oscillation stage module; generating the analog signal by the programmable signal generator; receiving the analog signal by the A-O Q-switch driver to generate the radio frequency signal in the step shape; applying the radio frequency signal generated by the A-O Q-switch driver to the A-O Q-switch; converting, by a piezoelectric transducer of the A-O Q-switch, an electric energy of the radio frequency signal in the step shape into an ultrasonic energy corresponding to a respective step height and duration; and modulating, by an A-O crystal of the A-O Q-switch, a diffraction efficiency of the A-O crystal for the laser according to an intensity of the ultrasonic energy, to modulate the laser generated by the oscillation stage module to convert the laser into the pulsed laser with an adjustable sub-pulse energy, an adjustable sub-pulse number and an adjustable sub-pulse interval.
In some embodiments of the present disclosure, the method for generating the pulsed laser further includes: providing the pumping current for the oscillation stage module by the driving power supply, to adjust the power of the laser generated by the oscillation stage module.
In some embodiments of the present disclosure, an intensity of each step of the radio frequency signal in the step shape is adjusted in real time according to the pumping current. A length of each step is synchronized with a required sub-pulse interval time.
The technical solutions of the present disclosure are described in detail below with reference to specific embodiments. It should be noted that the following specific embodiments are only used for illustration, and shall not be construed to limit the present disclosure.
Example 1
The principle of generating a multi-pulsed laser from the A-O Q-switched solid-state laser device of the present disclosure will be described below with reference to FIG. 1 and FIG. 2.
FIG. 1 is a schematic diagram of an A-O Q-switched solid-state laser device according to an embodiment of the present disclosure. As shown in FIG. 1, the A-O
Q-switched solid-state laser device includes: an oscillation stage module 2 configured to continuously generate a laser; a programmable signal generator 8 configured to generate an analog signal; an A-O Q-switch driver 7 configured to receive the analog signal generated by the programmable signal generator 8 to generate a radio frequency signal in a step shape; an A-O Q-switch 3 configured to receive the radio frequency signal generated by the A-O Q-switch driver 7, and modulate, according to the radio frequency signal, the laser generated by the oscillation stage module 2 to convert the laser into a pulsed laser; a driving power supply 9 configured to provide a pumping current for the oscillation stage module 2 to adjust a power of the laser generated by the oscillation stage module 2. The driving power supply 9 is configured to adjust the pumping current to adjust the pumping power of the oscillation stage module, so as to adjust the power of the laser generated by the oscillation stage module. The A-O Q-switched solid-state laser device further includes a total reflection mirror 1 placed on one side of the oscillation stage module 2 and a laser output lens 4 placed on the other side of the oscillation stage module 2, and total reflection mirror 1 and laser output lens 4 are arranged symmetrically and collinearly, and a resonant cavity is formed between the total reflection mirror 1 and the laser output mirror 4. The A-O Q-switch 3 is located between the oscillation stage module 2 and the laser output lens 4, and is as close to the oscillation stage module 2 as possible, so that a fine-tuning angle of the A-O Q-switch 3 can completely turn off the optical path. The pulsed laser generated by the A-O Q-switch modulation is oscillated in the resonant cavity, and is output through the laser output lens. The A-O Q-switched solid-state laser device further includes: a beam expander lens group 5 configured to expand and shape the pulsed laser output from the laser output lens; and a collimation output lens group 6 for hard optical path transmission configured to transmit the expanded and shaped laser output from the beam expander lens group 5 through a hard optical path.
FIG. 2 is a diagram showing a principle of outputting a double-pulsed laser from an
A-O Q-switched solid-state laser device according to an embodiment of the present disclosure. The working principle of the A-O Q-switch is as follows. By applying a high-level radio frequency signal, an A-O crystal in the A-O Q-switch 3 has a high diffraction efficiency. Due to the diffraction effect of the A-O crystal, when the laser in the resonant cavity is suppressed by the A-O Q-switch 3, the diffraction loss of the resonant cavity is increased. Since Nd:YAG crystal rod is continuously pumped by a laser diode (LD) in the oscillation stage module, a large number of inverted particles will be accumulated in the oscillation stage module 2. if the applied RF signal is cut off at this time, the A-O crystal will return to a high transmittance state, and the A-O crystal in the A-O Q-switch 3 will no longer diffract the laser, reducing the diffraction loss, and the number of inverted particles will transit to a lower energy level, to instantaneously output the pulsed laser from the resonant cavity.
As shown in FIG. 2, at the first step of the RF signal, the diffraction efficiency of the
A-O crystal of the A-O Q-switch 3 is relatively high, that is, the diffraction loss is relatively large and the resonant cavity is in a low Q value state. When the intensity of the applied RF signal is reduced, that is, the RF signal drops to the second step, the diffraction efficiency decreases accordingly, so as to instantaneously output a pulse from the resonant cavity. in the duration of the second step of the second RF signal, the LD of the oscillation stage module 2 continues to pump, and reversed particles are accumulated continuously. When the intensity of the RF signal is further reduced, the diffraction efficiency decreases accordingly, forming a second pulse, thus completing the output of two pulses in one cycle. By analogy, this control method can be used to design a multi-step RF signal output to affect the diffraction of the laser caused by the A-O Q-switch 3, thereby obtaining the multi- pulse.
The programmable signal generator 8 inputs a suitable analog modulation signal into the A-O Q-switch driver 7 to output a corresponding stepped RF signal. As shown in FIG. 2, a width of the first step in the RF signal graph represents an accumulation time of the inverted particles in the resonant cavity, widths of the second and subsequent steps determine time intervals of the sub-pulse generation.
The wider the step width, the longer the time interval of sub-pulse generation. By adjusting the step width, the interval between the sub-pulses can be in the range of 500 ns to 10 ps. The RF signal of the first step output by the A-O Q driver has a voltage of 3 V, the RF signal of the second step has a voltage range from 1.5 to 2.5
V, and the width of the second step is in a range of 500 ns to 10 us. A sub-pulse energy ratio can be adjusted by adjusting a height ratio of the steps of the radio frequency signal. The heights of the steps of the RF signal can be adjusted in such away that the sub-pulse energy ratio is in a range of 1:1 to 1:0.7.
FIG. 3 is a diagram showing a comparison between a tested RF signal waveform graph and a designed RF signal waveform graph according to an embodiment of the present disclosure. As shown in FIG. 3, the tested RF signal waveform is highly similar to the designed RF signal waveform. The RF signal realized in the drawing has a frequency of 10 kHz.
FIG. 4 is a waveform graph of a double-pulsed laser according to an embodiment of the present disclosure. it can be seen from the left figure that the present laser outputs a pulsed laser with a repetition frequency of 5 kHz, and the right figure shows a partially amplified pulse. it can be seen that the sub-pulse interval of the double-pulsed laser output is about 500 ns. it can be seen from FIG. 4 that the A-O
Q-switched solid-state laser device with the adjustable pulse output of the present disclosure can generate a double-pulsed laser, and a pulse width of one pulse of the laser is 70 ns. In a case where a damage threshold of an optical surface or an optical fiber section is fixed, the present disclosure can theoretically increase the input energy by multiple times and effectively solve the problems of the high energy and the damage in the application of laser cleaning.
It can be noted that for the A-O Q-switched solid-state laser device of the present disclosure, the number of sub-pulses, the energy ratio and the sub-pulse interval can be adjusted.
The specific embodiments described above further describe the purpose, the technical solutions and the beneficial effects of the present disclosure in detail. It should be understood that the above-mentioned specific embodiments are only
Hustrated, which shall not be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from spirit, principles and scope of the present disclosure.

Claims (10)

ConclusiesConclusions 1. Een A-O Q-geschakelde vaste toestandslaserinrichting met een aanpasbare puls uitvoer, omvattende: een oscillerende fasemodule, ingericht om continu een laser te genereren; een programmeerbare signaalgenerator, ingericht om een analoog signaal te genereren; een A-O Q-schakelaarsbesturing, ingericht om het analoge signaal dat is gegenereerd door de programmeerbare signaalgenerator te ontvangen voor het genereren van een radiofrequent signaal in een stapvorm; en een A-O Q-schakelaar, ingericht om het radiofreguente signaal dat is gegenereerd door de A-O Q-schakelaarsbesturing te ontvangen, en te moduleren, volgens het radiofrequente signaal, de laser die is gegenereerd door de oscillerende fasemodule om te zetten in een gepulseerde laser.An A-O Q-switched solid state laser device with an adjustable pulse output, comprising: an oscillating phase module configured to continuously generate a laser; a programmable signal generator, adapted to generate an analog signal; an A-O Q switch controller configured to receive the analog signal generated by the programmable signal generator to generate a radio frequency signal in a step form; and an A-O Q switch configured to receive the radio frequency signal generated by the A-O Q switches control, and modulate, according to the radio frequency signal, converting the laser generated by the oscillating phase module into a pulsed laser. 2. De A-O Q-geschakelde vaste toestandslaserinrichting volgens conclusie 1, waarbij de A-O Q-geschakelde vaste toestandslaserinrichting een werkfrequentie heeft van 50 MHz, en een elektrische puls dalingstijd van < 120 ns.The A-O Q-switched solid state laser device according to claim 1, wherein the A-O Q-switched solid state laser device has an operating frequency of 50 MHz, and an electrical pulse decay time of < 120 ns. 3. De A-O Q-geschakelde vaste toestandslaserinrichting volgens conclusie 1, waarbij de A-O Q-geschakelde vaste toestandslaserinrichting verder een volledig reflecterende spiegel omvat die op één zijde van de oscillerende fasemodule geplaatst is en een laseruitvoerlens die op de andere zijde van de oscillerende fasemodule is geplaatst, en de volledig reflecterende spiegel en de laseruitvoerlens symmetrisch en collineair zijn opgesteld, en een resonantieholte wordt gedefinieerd tussen de volledig reflecterende spiegel en de laseruitvoerlens; de A-O Q-schakelaar is gepositioneerd tussen de oscillerende fasemodule en de laseruitvoerlens of tussen de oscillerende fasemodule en de volledig reflecterende spiegel, en de gepulseerde laser die is gegenereerd door de A-O Q- schakelaar wordt geoscilleerd in de resonantieholte en uitgebracht door de laseruitvoerlens.3. The A-O Q-switched solid state laser device according to claim 1, wherein the A-O Q-switched solid state laser device further comprises a fully reflective mirror disposed on one side of the oscillating phase module and a laser output lens disposed on the other side of the oscillating phase module placed, and the fully reflective mirror and the laser output lens are arranged symmetrically and collinearly, and a resonant cavity is defined between the fully reflective mirror and the laser output lens; the A-O Q switch is positioned between the oscillating phase module and the laser output lens or between the oscillating phase module and the fully reflective mirror, and the pulsed laser generated by the A-O Q switch is oscillated in the resonant cavity and released by the laser output lens. 4. De A-O Q-geschakelde vaste toestandslaserinrichting volgens conclusie 3, waarbij de laseruitvoerlens een laserdoorlating heeft variërend van 40% tot 70%.The A-O Q-switched solid state laser device according to claim 3, wherein the laser output lens has a laser transmittance ranging from 40% to 70%. 5. De A-O Q-geschakelde vaste toestandslaserinrichting volgens conclusie 3, waarbij de resonantieholte een lengte heeft van 400 mm.The A-O Q-switched solid state laser device according to claim 3, wherein the resonant cavity has a length of 400 mm. 6. De A-O Q-geschakelde vaste toestandslaserinrichting volgens conclusie 3, waarbij de A-O Q-geschakelde vaste toestandslaserinrichting verder omvat: een bundel verbredende lensgroep, ingericht om de gepulseerde laseruitvoer van de laseruitvoerlens uit te breiden en te vormen.6. The A-O Q-switched solid state laser device according to claim 3, wherein the A-O Q-switched solid state laser device further comprises: a beam broadening lens group configured to expand and shape the pulsed laser output of the laser output lens. 7. De A-O Q-geschakelde vaste toestandslaserinrichting volgens conclusie 6, waarbij de A-O Q-geschakelde vaste toestandslaserinrichting verder omvat: een collimatie uitvoerlensgroep voor harde optische wegtransmissie, ingericht om de verbreedde en gevormde laseruitvoer van de bundel verbredende lensgroep door te laten door een harde optische weg; of een gekoppelde lensgroep voor optische fibertransmissie, ingericht om de verbreedde en gevormde laseruitlaat van de bundel verbredende lensgroep te koppelen in een optische fiber voor transmissie.7. The A-O Q-switched solid state laser device according to claim 6, wherein the A-O Q-switched solid state laser device further comprises: a collimation output lens group for hard optical path transmission, adapted to transmit the broadened and shaped laser output of the beam broadening lens group through a hard optical path; or a coupled lens group for optical fiber transmission, adapted to couple the widened and shaped laser outlet of the beam widening lens group into an optical fiber for transmission. 8. De A-O Q-geschakelde vaste toestandslaserinrichting volgens conclusie 1, waarbij de A-O Q-geschakelde vaste toestandslaserinrichting verder omvat: een besturingsstroomtoevoer, ingericht om de oscillerende fasemodule te voorzien van een pompstroom, en voor het aanpassen van de pompstroom om een pompvermogen van de oscillerende fasemodule aan te passen, zodat een vermogen van de laser gegenereerd door de oscillerende fasemodule wordt aangepast.8. The A-O Q-switched solid state laser device according to claim 1, wherein the A-O Q-switched solid state laser device further comprises: a control current supply, configured to supply the oscillating phase module with a pump current, and for adjusting the pump current to provide a pump power of the oscillating phase module, so that a power of the laser generated by the oscillating phase module is adjusted. 9. Een werkwijze voor het genereren van een gepulseerde laser met de A-O Q-geschakelde vaste toestandslaserinrichting volgens één van de conclusies 1-8, omvattende: het genereren van de laser door de oscillerende fasemodule; het genereren van het analoge signaal door de programmeerbare signaalgenerator; het ontvangen van het analoge signaal door de A-O Q-schakelaarsbesturing voor het genereren van het radiofrequente signaal in de stapvorm, en het toepassen van het radiofrequente signaal gegenereerd door de A-O Q- schakelaarsbesturing voor de A-O Q-schakelaar;A method for generating a pulsed laser with the A-O Q-switched solid state laser device according to any one of claims 1 to 8, comprising: generating the laser by the oscillating phase module; generating the analog signal by the programmable signal generator; receiving the analog signal by the A-O Q switches control to generate the radio frequency signal in the step form, and applying the radio frequency signal generated by the A-O Q switches control to the A-O Q switch; het omzetten, door een piézo-elekirische omvormer van de A-O Q- schakelaar, van een elekirische energie van het radiofrequente signaal in de stapvorm in een ultrageluidsenergie overeenkomstig met een respectievelijke staphoogte en duur; en het moduleren, door een A-O kristal van de A-O Q-schakelaar, van een diffractie efficiëntie van het A-O kristal voor de laser volgens een intensiteit van de ultrageluidsenergie, voor het moduleren van de laser gegenereerd door de oscillerende fasemodule voor het omzetten van de laser in de gepulseerde laser met een aanpasbare sub-puls energie, een aanpasbaar sub-puls aantal en een aanpasbaar sub-puls interval.converting, by a piezoelectric transducer of the A-O Q switch, an electrical energy of the radio frequency signal in the step form into an ultrasound energy corresponding to a respective step height and duration; and modulating, by an A-O crystal of the A-O Q switch, a diffraction efficiency of the A-O crystal for the laser according to an intensity of the ultrasound energy, for modulating the laser generated by the oscillating phase module for converting the laser in the pulsed laser with an adjustable sub-pulse energy, an adjustable sub-pulse number and an adjustable sub-pulse interval. 10. De werkwijze volgens conclusie 9, verder omvattende: het voorzien van de pompstroom voor de oscillerende fasemodule door de besturingsstroomtoevoer, voor het aanpassen van het vermogen van de laser gegenereerd door de oscillerende fasemodule; en het aanpassen van een intensiteit van iedere stap van het radiofreguentie signaal in de stapvorm in real-time volgens de pompstroom, en het synchroniseren van een lengte van iedere stap met een vereiste sub-puls tijdsinterval.The method of claim 9, further comprising: providing the pump current for the oscillating phase module through the control current supply, for adjusting the power of the laser generated by the oscillating phase module; and adjusting an intensity of each step of the radio frequency signal in the step form in real time according to the pump current, and synchronizing a length of each step with a required sub-pulse time interval.
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