CN217158936U - Intracavity third harmonic laser generator with passive Q switch - Google Patents

Abstract

The embodiment of the utility model discloses an intracavity third harmonic laser generator with a passive Q switch, which comprises a pumping source, a laser crystal, a passive Q switch, a semi-transmitting semi-reflecting mirror, a multiple frequency crystal and an end mirror; a pump source for pumping at a repetition frequency to output pulsed pump light; a laser crystal for emitting laser light after being pumped by pulsed pump light from the pump source; the passive Q switch is used for conducting or cutting the fundamental frequency light in the laser resonant cavity; the semi-transmitting and semi-reflecting mirror is used for transmitting the infrared laser and reflecting the ultraviolet laser; the frequency multiplication crystal is used for transmitting the transmitted laser; and the cavity mirror is used for simultaneously high-reflection intra-cavity fundamental frequency light and double-frequency light. The utility model discloses a set up pumping source, laser crystal, passive Q switch, semi-transparent half-reflection mirror, frequency multiplication crystal and chamber mirror, with the help of switching on or cutting of passive Q switch to in transmission to laser or cutting, the passive Q switch that realizes carrying is small, and with low costs, and integrated degree is high.

Description

Intracavity third harmonic laser generator with passive Q-switching

technical field

The utility model relates to the technical field of laser generators, in particular to an intracavity third harmonic laser generator with passive Q-switching.

Background technique

A laser generator, also known as a laser, is a device that emits laser light. Single-longitudinal-mode pulsed lasers are often used as pulse seed sources in high-energy amplification systems due to their good monochromaticity and no modulation in the time domain. The dispersion method, the F-P etalon method, the compound cavity method, the annular cavity method and the combination of the above methods can be used to realize the operation of the single longitudinal mode. The single longitudinal mode laser structure is generally more complex and the output power is small. In order to improve the peak power of the single-frequency pulse, the Q-switching method can be used. The device required for active Q-switching is large in size and complex in structure; the existing passive Q-switched laser is used as the pulse seed source to avoid complex structure, but the existing passive Q-switching laser The switching laser has a pump source, two lenses, a mirror, a laser medium, a saturable absorber, and another mirror. The mirror, the laser medium, the saturable absorber, and another mirror form an optical resonator, but this Passive Q-switched lasers are bulkier and more expensive.

Therefore, it is necessary to design a new generator to realize the portable passive Q-switch with small volume, low cost and high integration.

Utility model content

The technical problem to be solved by the utility model is to provide an intracavity third harmonic laser generator with a passive Q switch.

In order to solve the above-mentioned technical problems, the purpose of the present utility model is achieved through the following technical solutions: providing a pump source, a laser crystal, a passive Q switch, a half mirror, a multi-frequency crystal and a cavity mirror;

the pump source is used for pumping at a repetition frequency to output pulsed pump light;

the laser crystal for emitting laser light after being pumped by the pulsed pump light from the pump source;

The passive Q switch is used to conduct or cut off the fundamental frequency light in the laser resonator;

The semi-transparent mirror is used to transmit infrared laser light and reflect ultraviolet laser light;

The multi-frequency crystal is used to transmit the transmitted laser light;

The cavity mirror is used for simultaneous high anti-cavity fundamental frequency light and double frequency light.

Its further technical scheme is as follows: it also includes a reflector;

The reflecting mirror is used for outputting the reflected laser light of the half mirror after secondary reflection.

Its further technical scheme is as follows: the multi-frequency crystal includes a frequency-doubling crystal and a frequency-doubling crystal connected in sequence, the frequency-doubling crystal is connected to the half mirror, and the frequency-doubling crystal is connected to the half-mirror. The cavity mirror is connected.

A further technical solution is: a pump mirror is connected between the pump source and the laser crystal.

Its further technical scheme is as follows: the laser crystal is a low-doped long crystal.

Its further technical scheme is as follows: the laser crystal is made by chemical bonding.

Its further technical scheme is: the laser crystal is formed by mixed doping of Nd:YAG and Cr4+.

Compared with the prior art, the present utility model has the following beneficial effects: the present utility model is provided with a pump source, a laser crystal, a passive Q switch, a semi-transparent mirror, a multi-frequency crystal and an end mirror, and with the help of the guidance of the passive Q switch. It can be switched on or off, so as to facilitate the transmission or cutoff of the laser light, and the passive Q-switch to be carried is small in size, low in cost and high in integration.

The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic block diagram of an intracavity third harmonic laser generator with a passive Q switch provided by an embodiment of the present invention.

Description in the figure:

10, pump source; 20, pump mirror; 30, laser crystal; 40, passive Q switch; 50, half mirror; 60, triple frequency crystal; 70, cavity mirror; 80, mirror; 90, Control system; 100, double frequency crystal.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, not all of the embodiments. . Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It is to be understood that, when used in this specification and the appended claims, the terms "comprising" and "comprising" indicate the presence of the described features, integers, steps, operations, elements and/or components, but do not exclude one or The presence or addition of a number of other features, integers, steps, operations, elements, components, and/or sets thereof.

It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural unless the context clearly dictates otherwise.

It should also be further understood that, as used in this specification and the appended claims, the term "and/or" refers to any and all possible combinations of one or more of the associated listed items, and including these combination.

Please refer to FIG. 1. FIG. 1 is an intracavity third harmonic laser generator with a passive Q switch provided by an embodiment of the present invention, which can be used to emit laser light in a scene requiring laser light.

Please refer to FIG. 1. FIG. 1 is a schematic block diagram of an intracavity third harmonic laser generator with a passive Q switch provided by an embodiment of the present invention. The intracavity third harmonic laser generator with a passive Q switch includes a pump The source 10 , the laser crystal 30 , the passive Q switch 40 , the half mirror 50 , the multi-frequency crystal and the cavity mirror 70 .

The pump source 10 is used for pumping at a repetition frequency to output pulsed pump light.

In this embodiment, the above-mentioned intracavity third harmonic laser generator with passive Q switch is connected to the control system 90, the control system 90 is connected to the pump source 10, and the control system can control the pump source 10 according to the actual situation. The frequency of the excitation light is emitted to make the laser generator suitable for different scenarios.

Specifically, the control system 90 can control the frequency of the laser generator according to the parameters in the parameter table by setting the parameter table. Of course, the parameter table can be adjusted in real time by the user according to the actual situation.

In addition, the above-mentioned laser crystal 30 is used to emit laser light after being pumped by the pulsed pump light from the pump source 10 .

In this embodiment, the laser crystal 30 can convert the excitation light into laser light, so as to use the laser to turn on or off the passive Q switch 40 , so as to transmit or cut off the laser light through the passive Q switch 40 .

The above-mentioned passive Q-switch 40 is used to conduct or cut off the fundamental frequency light in the laser resonator;

The above-mentioned semi-transparent mirror 50 is used to transmit infrared laser light and reflect ultraviolet laser light;

The above-mentioned multi-frequency crystal is used to transmit the transmitted laser light;

The cavity mirror 70 described above is used for simultaneous high-reflection intra-cavity fundamental frequency light and double frequency light.

The laser light passing through the passive Q-switch 40 can be transmitted through the half mirror 50 , the multi-frequency crystal and the cavity mirror 70 to be output for use by subsequent devices.

In this embodiment, the laser generator further includes a harmonic cavity, and the above-mentioned pump source 10, laser crystal 30, passive Q switch 40, half mirror 50, multi-frequency crystal and cavity mirror 70 are respectively arranged in the harmonic cavity.

The above-mentioned cavity harmonic laser generator with passive Q switch 40 adopts passive Q switch 40 . The passive Q switch 40 is small in overall size, low in cost, and high in reliability, and the laser generator is low in cost and high in integration.

In addition, the laser light received by the cavity mirror 70 can also be returned to the multi-frequency crystal, and then reflected by the reflector 80 and then output.

In one embodiment, please refer to FIG. 1 , the above-mentioned intracavity third harmonic laser generator with passive Q switch further includes a mirror 80;

The reflecting mirror 80 is used to perform secondary reflection of the reflected laser light of the half mirror 50 and output it.

In this embodiment, the half mirror 50 transmits the laser light through a multi-frequency crystal and then outputs it from the cavity mirror 70 , and the laser light reflected by the laser processor is reflected twice by the mirror 80 and then output.

In one embodiment, the multi-frequency crystal includes a frequency-doubling crystal 60 and a frequency-doubling crystal 100 connected in sequence, the frequency-doubling crystal 60 is connected to the half mirror 50 , and the two The frequency doubling crystal 00 is connected to the cavity mirror 70 .

In one embodiment, a pump mirror 20 is connected between the pump source and the laser crystal 30 . The pump mirror 20 can transmit the excitation light from the pump source to the laser crystal 30 .

In one embodiment, the above-mentioned laser crystal 30 is, but not limited to, a low-doped long crystal.

In one embodiment, the above-mentioned laser crystal 30 is fabricated by chemical bonding.

In one embodiment, the above-mentioned laser crystal 30 is formed by mixed doping of Nd:YAG and Cr4+.

In an embodiment, the number of the above-mentioned multi-frequency crystals is at least two, one of which is a frequency-doubling crystal 100, and the other is a frequency-tripping crystal 60. The infrared light passes through the frequency-doubling crystal 60, and then passes through the frequency-doubling crystal 60. The frequency doubling crystal 100, the cavity mirror 70 is an end mirror with high reflection to both infrared and green light, and the frequency triple crystal 60 can be at or close to the Brewster's angle to the infrared.

The pump source 10 is pumped at a repetition rate to output pulsed pump light; the laser crystal 30 emits laser light after being pumped by the pulsed pump light from the pump source 10 ; the passive Q switch 40 has The semi-transparent mirror 50 transmits infrared laser light and reflects ultraviolet laser light; the multi-frequency crystal transmits the transmitted laser light; the cavity mirror 70 reflects the fundamental frequency light and double frequency light in the cavity at the same time.

The above-mentioned intra-cavity third-harmonic laser generator with passive Q-switch is provided with a pump source 10, a laser crystal 30, a passive Q-switch 40, a half mirror 50, a multi-frequency crystal and a cavity mirror 70, with the help of passive The turn-on or turn-off of the Q-switch 40 facilitates the transmission or cut-off of the laser light, and the portable passive Q-switch 40 is small in size, low in cost, and high in integration.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Equivalent modifications or replacements should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (6)

1. The intracavity third harmonic laser generator with passive Q switch, is characterized in that, comprises pump source, laser crystal, passive Q switch, half mirror, multi-frequency crystal and cavity mirror; the pump source is used for pumping at a repetition frequency to output pulsed pump light; the laser crystal for emitting laser light after being pumped by the pulsed pump light from the pump source; The passive Q switch is used to conduct or cut off the fundamental frequency light in the laser resonator; The semi-transparent mirror is used to transmit infrared laser light and reflect ultraviolet laser light; The multi-frequency crystal is used to transmit the transmitted laser light; The cavity mirror is used for simultaneous high anti-cavity fundamental frequency light and double frequency light. 2. The intracavity third harmonic laser generator with passive Q switch according to claim 1, characterized in that, further comprising a reflecting mirror; The reflecting mirror is used for outputting the reflected laser light of the half mirror after secondary reflection. 3. The intracavity third harmonic laser generator with passive Q switch according to claim 1, wherein the multi-frequency crystal comprises a frequency-doubling crystal and a frequency-doubling crystal connected in sequence, and the The triple frequency crystal is connected with the half mirror, and the double frequency crystal is connected with the cavity mirror. 4 . The intracavity third harmonic laser generator with passive Q switch according to claim 3 , wherein a pump mirror is connected between the pump source and the laser crystal. 5 . 5 . The intracavity third harmonic laser generator with passive Q switch according to claim 1 , wherein the laser crystal is a low-doped long crystal. 6 . 6 . The intracavity third harmonic laser generator with passive Q switch according to claim 1 , wherein the laser crystal is made by chemical bonding. 7 .

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