CN211182789U

CN211182789U - Gaussian pulse width adjustable laser

Info

Publication number: CN211182789U
Application number: CN201922235734.9U
Authority: CN
Inventors: 杨祥辉; 郑权; 王禹凝; 宋国龙; 苏庆超; 赵岭
Original assignee: Changchun New Industries Optoelectronics Tech Co ltd
Current assignee: Changchun New Industries Optoelectronics Tech Co ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-08-04
Anticipated expiration: 2029-12-13

Abstract

The utility model provides a laser with continuously adjustable Gaussian pulse width, which comprises a laser main body and an amplifier, wherein the laser main body comprises a seed source, a frequency control circuit, a temperature control circuit and a pulse width control circuit, and the amplifier is used for amplifying pulses to obtain higher energy; the pulse width control circuit comprises a square wave pulse electric signal generating chip, a driver and a capacitor module, wherein the capacitor module is connected with the seed source in parallel. The utility model discloses mainly improve to pulse width control circuit to realize the width tuning of the gaussian pulse of laser instrument, realize the different width output of gaussian laser pulse. The utility model discloses the different electric capacity of different pulse matching is realized to the laser instrument, and the electric capacity of equidimension not is parallelly connected to each links to each other with a relay, and the relay has the multiple control function, and the serial ports control switch of quick chip is crossed on every sweetgum fruit, and during different pulses, different electric capacities are selected through the relay of cutting off different roads, thereby realize adjustable gaussian laser pulse width output.

Description

Gaussian pulse width adjustable laser

Technical Field

The utility model relates to a gaussian pulse width tunable laser belongs to optics, electronics field.

Background

In recent years, in the field of aerospace and photoelectric countermeasure, infrared simulation of flying targets is performed, the application of lasers is very wide, pulse lasers are needed for the application, the pulse width is adjustable, the effect of simulation targets is better guaranteed, in order to obtain the pulse width with the adjustable pulse width, electric signals are generally adopted to generate different pulse widths and drive the lasers, the pulse shapes generated by the method are all square waves, in addition, the energy of the lasers is needed to be as high as possible during simulation, the lasers need to be amplified in order to obtain high energy, however, due to the influence of the service life of the amplification energy level, the energy absorbed by the leading edge of the square wave-shaped pulse is more, the increase is fast, the energy absorbed by the pulse lagging is less, the increase is slow, the pulse is finally distorted, and the actual pulse is narrowed, as shown in fig. 1 (b). Moreover, the wider the pulse, the more the narrowing, and the greater the effect on the simulation, as shown in fig. 2. The gaussian pulse is slightly affected by this effect in the amplification process, as shown in fig. 1 (a), but to achieve the pulse width adjustability, the electrical signal can only give a square wave signal, but cannot give a gaussian pulse width adjustability.

SUMMERY OF THE UTILITY MODEL

To the not enough of above-mentioned prior art laser existence, the utility model aims to provide a gaussian pulse width adjustable laser ware, this laser ware can realize the different width output of gaussian laser pulse.

The technical scheme of the utility model is realized like this: a Gaussian pulse width adjustable laser comprises a laser body and an amplifier, wherein the laser body comprises a seed source, a frequency control circuit, a temperature control circuit and a pulse width control circuit, and the amplifier is used for amplifying pulses to obtain higher energy; the pulse width control circuit comprises a square wave pulse electric signal generating chip, a driver and a capacitor module, wherein the capacitor module is connected with the seed source in parallel; the capacitor module is composed of a plurality of capacitors connected in parallel and a relay connected with each capacitor.

The utility model has the advantages that:

1. the utility model discloses mainly improve to pulse width control circuit to realize the width tuning of the gaussian pulse of laser instrument, realize the different width output of gaussian laser pulse.

2. The utility model discloses the different electric capacity of different pulse matching is realized to the laser instrument, and the electric capacity of equidimension not is parallelly connected to each links to each other with a relay, and the relay has the multiple control function, and the serial ports control switch of quick chip is crossed on every sweetgum fruit, and during different pulses, different electric capacities are selected through the relay of cutting off different roads, thereby realize adjustable gaussian laser pulse width output.

Drawings

FIG. 1 is an output waveform effect diagram of amplified Gaussian and square waves.

Fig. 2 is a graph of amplification effect of square wave pulses with different widths.

Fig. 3 illustrates the inventive MOPA laser assembly structure.

FIG. 4 is a schematic diagram of the Gaussian pulse generation structure of the present invention

Fig. 5 is a schematic diagram of square wave driving to generate gaussian light pulse.

Detailed Description

The invention is further described with reference to the following figures and examples:

shown in figures 3 and 4: a Gaussian pulse width adjustable laser comprises a laser body 1 and an amplifier 2, wherein the laser body 1 comprises a seed source 1-1 (the seed source in the embodiment can adopt a seed source with a DFB1064 in the prior art), a frequency control circuit 1-2, a temperature control circuit 1-3 and a pulse width control circuit 1-4, and the amplifier 2 is used for amplifying pulses to obtain higher energy; the pulse width control circuit 1-4 comprises a square wave pulse electric signal generating chip (a DS1023 chip in the prior art can be adopted in the embodiment) 1-4-1, a driver 1-4-2 and a capacitor module 1-4-3, wherein the capacitor module 1-4-3 is connected with a seed source 1-1 in parallel; the capacitance module 1-4-3 is composed of a plurality of capacitors connected in parallel and a relay connected with each capacitor.

The pulse width control circuit 1-4 can control the pulse width of the electric signal, when the rising edge of the clock signal is identified, the electric signal with adjustable pulse width can be generated, the pulse width of the signal is controlled by the chip 1-4-1, any desired electric pulse width can be met, after the pulse width is obtained, the electric signal is sent to the driver 1-4-2, so that the driver has the function of driving the laser, when the matched capacitor module 1-4-3 is not used, the output of the laser is also square wave pulse, at the moment, when the capacitor module 1-4-3 is connected with the laser in parallel, the capacitor can be charged when the power is supplied to the laser, thereby preventing the pulse width of the laser from rapidly reaching the maximum, but slowly rising, the rising is similar to a Gaussian curve, and the rising time depends on the size of the capacitor, the larger the capacitance, the more charge that can be absorbed, the more charge the laser is drained, and the longer the time to rise to the maximum pulse. When the electric pulse disappears, the capacitor stores electric quantity, although the electric pulse disappears instantly, the capacitor can discharge to provide energy for the laser, so that the laser pulse slowly descends, the descending trend is also a Gaussian curve, and if a proper capacitor is selected, the ascending curve and the descending curve can be just connected to form a perfect Gaussian pulse.

In order to realize that different pulses are matched with different capacitors, the capacitor modules 1-4-3 are designed as shown in fig. 4, capacitors with different sizes are connected in parallel and are respectively connected with a relay, the relays have a multi-path control function, each path of the capacitors passes through a serial port control switch of a fast chip, and when different pulses are generated, the relays on different paths are switched off to select different capacitors, so that adjustable Gaussian laser pulse width output is realized.

①, generating a frequency signal, namely generating a desired laser frequency signal by a clock signal, wherein the signal is a trigger signal and a rising edge acts;

②, generating a square wave electric signal, namely, sending the clock signal to a chip after the clock signal is obtained, generating a square wave electric signal when the chip identifies the rising edge of one clock signal, wherein the square wave signal is amplified by radio frequency and has certain driving capability and is used for driving a laser;

③, generating an optical signal, namely if a square wave driving signal in ② is directly acted on a laser, the laser generates a square wave which is the same as the electric signal but not a Gaussian pulse wave, at the moment, the square wave electric signal needs to pass through a capacitor which is connected with the laser in parallel, and the capacitor has the function of storing electricity, so the electric signal can charge the capacitor while driving the laser, and the laser cannot rapidly reach the maximum value of the pulse but slowly rises.

The utility model discloses mainly improve to pulse width control circuit 1-4 to realize the width tuning of the gaussian pulse of laser instrument.

Claims

1. A Gaussian pulse width adjustable laser is characterized in that: the laser comprises a laser main body and an amplifier, wherein the laser main body comprises a seed source, a frequency control circuit, a temperature control circuit and a pulse width control circuit, and the amplifier is used for amplifying pulses to obtain higher energy; the pulse width control circuit comprises a square wave pulse electric signal generating chip, a driver and a capacitor module, wherein the capacitor module is connected with the seed source in parallel; the capacitor module is composed of a plurality of capacitors connected in parallel and a relay connected with each capacitor.