CN216489015U - Driving device for generating ultrashort laser pulse - Google Patents
Driving device for generating ultrashort laser pulse Download PDFInfo
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- CN216489015U CN216489015U CN202122549349.9U CN202122549349U CN216489015U CN 216489015 U CN216489015 U CN 216489015U CN 202122549349 U CN202122549349 U CN 202122549349U CN 216489015 U CN216489015 U CN 216489015U
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Abstract
The utility model discloses a driving device for generating ultrashort laser pulses, which comprises an ultrashort pulse signal generator, a broadband current amplifier circuit, a broadband laser diode and a bias current generating circuit, wherein the ultrashort pulse signal generator is used for generating pulse signals and comprises an external signal trigger end, a resistor, a step recovery diode, a polar capacitor and a signal output end, the external signal trigger end is connected with the resistor, the polar capacitor and the signal output end in parallel, and the step recovery diode is connected between the polar capacitor and the signal output end in series; the broadband current amplifier circuit is connected with the ultrashort pulse signal generator and is used for amplifying the pulse signals and enhancing the driving capability of the pulse signals; and the broadband laser diode is connected with the broadband current amplifier circuit and used for generating laser pulses. The driving device for generating the ultrashort laser pulse is simple and stable, and can generate adjustable and controllable picosecond ultrashort pulses suitable for industrial precision machining.
Description
Technical Field
The utility model relates to the technical field of laser pulses, in particular to a driving device for generating ultrashort laser pulses.
Background
With the development of laser application technology, particularly in the field of laser fine processing, picosecond lasers have great advantages over other nanosecond and continuous lasers, and picosecond lasers become more and more choices in the field of laser fine processing. The mode of generating pulse laser is roughly divided into two modes, one mode is to utilize a saturable absorber or a mode locking device to form nanosecond and picosecond pulses in a laser cavity, the method is relatively complex, particularly, the picosecond pulses obtained by utilizing the mode locking method need to insert the saturable absorber or other mode locking devices in the cavity, in addition, ultrashort pulses generated by the method have higher repetition frequency, are difficult to be applied to industrial fine processing, an additional pulse selector needs to be added, and the complexity and the cost of a system are increased; the other is a directly modulated semiconductor laser, and a pulse signal source required for modulating the semiconductor laser is generally in the nanosecond level.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned technical problems, the present invention aims to: a simple controllable driving device capable of generating stable ultrashort laser pulses is proposed.
In order to achieve the purpose, the utility model provides the following technical scheme:
a driving apparatus for generating ultrashort laser pulses, comprising:
the ultra-short pulse signal generator is used for generating pulse signals and comprises an external signal trigger end, a resistor, a step recovery diode, a polar capacitor and a signal output end, wherein the external signal trigger end is connected with the resistor, the polar capacitor and the signal output end in parallel, and the step recovery diode is connected between the polar capacitor and the signal output end in series;
the broadband current amplifier circuit is connected with the ultra-short pulse signal generator and is used for amplifying the pulse signals and enhancing the driving capability of the pulse signals;
the broadband laser diode is connected with the broadband current amplifier circuit and used for generating laser pulses;
and the bias current generating circuit is used for providing fixed current for the broadband laser diode.
Preferably, the signal width of the ultra-short pulse signal generator is 10-1000 picoseconds.
Preferably, the broadband current amplifier circuit comprises a triode and a metal-oxide semiconductor field effect transistor, and the bandwidth of the triode and the metal-oxide semiconductor field effect transistor is larger than 100 GHz.
Preferably, the peak current generated by the broadband current amplifier circuit is greater than 200 mA.
Preferably, the wavelength is 1um band, C + L band, or 2um band.
Preferably, the signal output terminal is a pulse width modulation circuit.
Preferably, the trigger signal of the external signal trigger terminal is a TTL signal or a gaussian signal.
Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
the driving device for generating the ultrashort laser pulse comprises an ultrashort pulse signal generator, a broadband current amplifier circuit, a broadband laser diode and a bias current generating circuit, wherein the ultrashort pulse signal generator generates a pulse signal and then is amplified by the broadband current amplifier circuit, so that the broadband laser diode generates the laser pulse.
Drawings
The technical scheme of the utility model is further explained by combining the accompanying drawings as follows:
FIG. 1 is a schematic structural diagram of a driving apparatus for generating ultrashort laser pulses according to the present invention;
FIG. 2 is a schematic structural diagram of an ultrashort pulse signal generator of the driving apparatus for generating ultrashort laser pulses according to the present invention;
fig. 3 is a schematic structural diagram of a bias current generating circuit of the driving apparatus for generating ultrashort laser pulses according to the present invention.
Wherein: 1. an ultra-short pulse signal generator; 101. an external signal trigger terminal; 102. a resistance; 103. a polar capacitance; 104. a step recovery diode; 105. a signal output terminal; 2. a broadband current amplifier circuit; 3. A broadband laser diode; 4. a bias current generating circuit.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the utility model easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the utility model.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.
Fig. 1 is a schematic structural diagram of a driving apparatus for generating ultrashort laser pulses according to the present invention, which includes an ultrashort pulse signal generator 1, a broadband current amplifier circuit 2, a broadband laser diode 3, and a bias current generating circuit 4. The ultra-short pulse signal generator 1 is used for generating pulse signals, and the signal width of the ultra-short pulse signal generator 1 is 10-1000 picoseconds. As shown in fig. 2, the ultra-short pulse signal generator 1 includes an external signal trigger terminal 101, a resistor 102, a step recovery diode 104, a polar capacitor 103, and a signal output terminal 105, wherein the external signal trigger terminal 101 is connected in parallel with the resistor 102, the polar capacitor 103, and the signal output terminal 105, and the step recovery diode 104 is connected in series between the polar capacitor 103 and the signal output terminal 105. The trigger signal of the external signal trigger terminal 101 is a TTL signal or a gaussian signal. The signal output terminal 105 may be a load resistor or a pulse width adjusting circuit, and the pulse width adjusting circuit is configured to control a generated picosecond pulse width, and the pulse width may be adjustable between 10ps and 100 ps.
The step recovery diode 104 is widely applied to ultra-wideband radar and wireless communication, and the step time of the step recovery diode 104 is as short as several picoseconds, so that an ultra-narrow pulse signal can be realized. Generally, a pulse signal obtained by using a step recovery diode is in the picosecond order, the signal power is low, and the pulse signal cannot directly act on the broadband laser diode 3, so that the pulse signal needs to be amplified by the broadband current amplifier circuit 2.
The broadband current amplifier circuit 2 is connected with the ultrashort pulse signal generator 1 and used for amplifying the pulse signals and enhancing the driving capability of the pulse signals. The broadband current amplifier circuit 2 comprises a triode and a metal-oxide semiconductor field effect transistor, and the bandwidth of the triode and the metal-oxide semiconductor field effect transistor is larger than 100 GHz.
A broadband laser diode 3 is connected to the broadband current amplifier circuit 2 for generating laser pulses. The broadband laser diode 3 is a distributed feedback laser diode or an external cavity laser diode, and the wavelength is 1um waveband, C + L waveband or 2um waveband.
The bias current generating circuit 4 supplies a fixed current to the broadband laser diode 3. The bias current generating circuit 4 can adopt a mode of a mirror constant current source or a voltage-controlled constant current source, the bias current is slightly higher than the threshold working current of the broadband laser diode 3, and laser can be emitted after the bias current is higher than the threshold. The peak current generated by the broadband current amplifier circuit 2 is greater than 200 mA.
As shown in fig. 3, an embodiment of the bias current generating circuit 4 is shown, and the bias current generating circuit 4 is composed of two transistors and corresponding resistors, and can generate a constant current source of 10 mA. The current generated by the bias current generating circuit 4 can be changed by adjusting the resistance.
The driving device for generating the ultrashort laser pulse has the advantages of simple structure, stable and reliable driving mode and controllable repetition frequency of the laser pulse, can be adjusted according to requirements, provides convenience for industrial processing and scientific research, and improves the performance of the laser pulse driving device.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A driving apparatus for generating ultrashort laser pulses, comprising:
the ultra-short pulse signal generator is used for generating pulse signals and comprises an external signal trigger end, a resistor, a step recovery diode, a polar capacitor and a signal output end, wherein the external signal trigger end is connected with the resistor, the polar capacitor and the signal output end in parallel, and the step recovery diode is connected between the polar capacitor and the signal output end in series;
the broadband current amplifier circuit is connected with the ultra-short pulse signal generator and is used for amplifying the pulse signals and enhancing the driving capability of the pulse signals;
the broadband laser diode is connected with the broadband current amplifier circuit and used for generating laser pulses;
and the bias current generating circuit is used for providing fixed current for the broadband laser diode.
2. A driving apparatus for generating ultrashort laser pulses as claimed in claim 1, wherein: the signal width of the ultra-short pulse signal generator is 10-1000 picoseconds.
3. A driving apparatus for generating ultrashort laser pulses as claimed in claim 1, wherein: the broadband current amplifier circuit comprises a triode and a metal-oxide semiconductor field effect transistor, and the bandwidth of the broadband current amplifier circuit is larger than 100 GHz.
4. A driving apparatus for generating ultrashort laser pulses as claimed in claim 1, wherein: the peak current generated by the broadband current amplifier circuit is greater than 200 mA.
5. A driving apparatus for generating ultrashort laser pulses as claimed in claim 1, wherein: the broadband laser diode is a distributed feedback laser diode or an external cavity laser diode, and the wavelength is 1um wave band, C + L wave band or 2um wave band.
6. A driving apparatus for generating ultrashort laser pulses as claimed in claim 1, wherein: the signal output end is a pulse width adjusting circuit.
7. A driving apparatus for generating ultrashort laser pulses as claimed in claim 1, wherein: and the trigger signal of the external signal trigger end is a TTL signal or a Gaussian signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122549349.9U CN216489015U (en) | 2021-10-22 | 2021-10-22 | Driving device for generating ultrashort laser pulse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122549349.9U CN216489015U (en) | 2021-10-22 | 2021-10-22 | Driving device for generating ultrashort laser pulse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216489015U true CN216489015U (en) | 2022-05-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202122549349.9U Active CN216489015U (en) | 2021-10-22 | 2021-10-22 | Driving device for generating ultrashort laser pulse |
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| CN (1) | CN216489015U (en) |
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2021
- 2021-10-22 CN CN202122549349.9U patent/CN216489015U/en active Active
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