Pulsed laser radiation source

FIELD: physics.

SUBSTANCE: pulsed laser radiation source has at least one pulsed laser, an optical means for summation of radiation and a focusing system. The source further includes a driving generator whose output is connected to the input of the pulsed laser, and the output of the pulsed laser is optically connected in series to an optical switch, a matching unit, an optical delay means and the optical means for summation of radiation and then further with the focusing system, wherein the output of the driving generator is connected to the control input of the optical switch.

EFFECT: high output optical power of laser radiation pulses.

2 dwg

 

The invention relates to laser technology, namely the adders of optical radiation, for example, semiconductor lasers, and can be used for power amplification of laser radiation in the fiber-optical communication lines, networks, information-measuring systems, process equipment, household appliances, medicine, systems identification and guidance, to protect objects from unauthorized and fire laser weapons, etc.

Known for high power fiber laser (Svetcov VI Optical and quantum electronics: textbook. Ivanovo: Ivanovo state chem.-technical University, 2010 (RIS on p.51), consisting of several single-mode fiber lasers, the radiation which is collected in a single fiber. Total radiation transmitted by the fiber to the focusing system.

The disadvantage of this device is the low level of the output power of laser radiation at relatively high cost of power from the power source.

Also known radiation sources based on laser diodes, the radiation of which is summed up by the optical system, for example, in the form of a set of prisms (RF patent No. 2172972, "Radiating adder" IPC7G02B 27/09 H01S 5/40; US Patent No. 5463534. Light source high power. F21V 7/04) to form a common beam radiation. Such systems can achieve very high values of the s intensities due to special arrangement of diodes and optical elements.

For example, a known light source high power (United States Patent No. 5463534. Light source high power. F21V 7/04,), which contains the number of emitting sources. To increase radiated power optical system colliery, focuses through the lens and summarizes using prisms laser beams of the individual lasers in the combined output beam of optical radiation.

A disadvantage of the known devices is the low output pulse (peak) optical radiation power, which is determined by the number of connected emitting sources.

The closest device to the technical nature of the claimed technical solution is the radiation source based on laser diodes (RF patent No. 2163048. The radiation source based on laser diodes. IPC7H01S 3/09, H01S 3/091. Publ.: 10.02.2001). The optical system of the device includes display means placed between the radiating source and the focus area, which includes means forming radiation and a means of focusing the radiation.

The tool includes forming tool callmerobbie radiation and a means to create a sum beam. Laser radiation from each laser diode after callmerobbie is transmitted to the prismatic means the sum and total collimating tool (cylindrical Lin is a). The result is a single homogeneous beam, which is focused by a spherical lens on the end face of the core of the optical fiber.

A disadvantage of the known device is the low output pulse (peak) optical radiation power, depending on the number of laser diodes.

The objective of the invention is to increase the output pulse (peak) optical radiation power at a much lower optical power of the source of pulsed laser radiation.

The technical result is to increase the output optical power of the laser radiation pulses due to the possibility of energy storage in the device when the same sources of power (energy) as in the prototype and in the proposed device.

This object is achieved in that the source of pulsed laser radiation contains at least one pulsed laser, optical means summation radiation and a focusing system. Additionally entered the master oscillator, the output of which is connected to the input of a pulse laser, and the output of the pulsed laser optically connected in series with the optical switch unit approval, by means of an optical delay and optical means for summing the radiation and forth with the focusing system, and the output for the surrounding of the generator is connected with the control input of the optical switch.

The source of pulsed laser radiation is shown in the block diagram - figure 1. The figure 2 shows the timing chart explaining the operation of the source of pulsed laser radiation.

The source of pulsed laser radiation contains connected in series master oscillator 1, the pulse laser 2, 3 optical switch unit 4 alignment with the optical means of the delay means 5 of the optical delay, made for example of segments of optical fiber and having a discrete time delay of the optical pulse. The radiation source includes optical means 6 summation radiation and focusing 7 system for forming a predetermined pattern of the beam at the output end of the optical means 6 summation of radiation.

Blocks 2-7 optically interconnected. The output of the master oscillator 1 is connected with the control input of the optical switch 3.

The signals generated at the outputs of the units of the scheme: J0k- 1, 2, ... N-1, N-th optical pulse laser 2 (T - period pulse); J'01...J'0Noptical pulses at the output of the optical switch 3; J1...JNoptical pulses at the output of the block alignment with the tool optical delay 4; J'1...J'Noptical pulses at the input of the optical means are summarized what I radiation 6; Jo- the radiation output device.

The figure 2 shows the following timing chart (vertical axis) deferred intensity J of the optical pulses, the abscissa shows the time t), where J0ksignals of the optical pulses (1, 2, ... N-1, N) of the pulse laser 2 (N is the number of pulses emitted by the laser, for a complete cycle of operation of the switch 3); J1I , J2, ... JN-1first, second, N-1 signals of the optical pulses at the output of the block alignment with the tool optical delay 4; JNsignal of the N-th optical pulse at the output of the block alignment with the tool optical delay 4, J'Nsignal of the N-th optical pulse at the output means of the optical delay 5 (this signal passes without delay; J'N-1...J'2, J'1signals N-1, the second and first optical pulses at the input of the optical means summation radiation 6; J'Jthe output signal of the optical means summation radiation 6.

The source of pulsed laser radiation works in the following way. The pulse signal from the oscillator 1 is fed to the input of the pulse laser 2 and manages its work. Pulses of optical radiation from the laser 2 is fed to the input of the optical switch 3. At the control input of the optical switch 3 receives the electrical pulses from the output specifies the GE is erator 1 frequency (1/T), equal to the frequency emitted by the laser 2 pulse of optical radiation. Upon receipt of the first control pulse from the master oscillator 1 optical switch 3 sends a pulse of optical radiation through the block matching tool optical delay 4 on the first element of the optical delay 5. On the second pulse from the master oscillator 1 optical switch 3 sends the optical radiation at the second element means of the optical delay 5 etc. Means optical delay comprises N-1 element. The N-th pulse laser 2 passes to the input of the optical means summation radiation 6 without delay. Outputs means of an optical delay 5 are connected with N-1 inputs optical means summation radiation 6. The N-th pulse of laser radiation is supplied to the N-th input optical means summation radiation directly. Elements of the medium optical delay 5 is designed so that all detainees pulses of laser radiation are received at the inputs of the optical means summation radiation 6 simultaneously with the N-th pulse. The output of the optical means of the summation of the radiation 6 is formed impulse J'Jequal to the sum of the intensities of the pulses of laser radiation.

Next, the resulting laser beam is focused focusing system 7. As a result, the output of the proposed device is istwa formed pulsed laser radiation J ofar superior to the intensity of the pulses of the laser radiation of the laser 2. Thus the repetition rate of the pulses at the output of the device is N times lower than the frequency (1/T) emitted by the laser pulse.

Thus, compared to known the closest analogue to the proposed technical solution is achieved a substantial increase in the output pulse (peak) optical power pulses of laser radiation due to the possibility of accumulation of energy at the same power sources as in the prototype and in the proposed device.

For example, if one source of laser radiation due to the possibility of energy storage in the proposed device can be obtained at the output is approximately N times more power pulses of laser radiation with the exception of optical radiation loss compared to power pulsed radiation of a single source with a pulse repetition frequency N times less than the pulse frequency of the laser.

Taking into account losses in the optical elements of the device, the intensity of the optical radiation Jothe output of the proposed device can be written in the following form:

where J0k- intensity pulsed radiation output of a pulsed laser;

δi- loss of intensity of the radiation is ment for each pulse when it passes through the optical system of the device.

The number N is determined by the set intensity of optical radiation Jo. Reduction of Jodue to the attenuation coefficient of the radiation in the optical elements of the medium delay.

The advantage of the proposed invention is the fact that to obtain pulses of high-intensity optical radiation requires a low power laser and power supply.

The source of pulsed laser radiation containing at least one pulsed laser, optical means summation radiation and a focusing system, wherein the inputs of the master oscillator, the output of which is connected to the input of a pulse laser, and the output of the pulsed laser optically connected in series with the optical switch unit approval, by means of an optical delay and optical means for summing the radiation and forth with the focusing system, and the output of the master oscillator is connected with the control input of the optical switch.



 

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