RU2265938C1 - Laser pumping device - Google Patents

Abstract

FIELD: pulse engineering; laser initiating pulse shapers.

SUBSTANCE: proposed device has power supply, flash transformer, flash lamp, N circuits set up of series-connected diode and capacitor, N thyristors, isolating diode, shunt capacitor, and choke. Isolating diode is connected in parallel with flash lamp and secondary winding of flash transformer. Flash lamp and secondary winding of flash transformer are interconnected and connected to each of N series-connected capacitor and thyristor circuits. Power supply is made in the form of storage capacitor. Switch is made in the form of thyristor.

EFFECT: enhanced effectiveness of laser lamp pumping due to enhanced output power of laser.

4 cl, 3 dwg

Description

The present invention relates to the field of pulsed technology and can be used in the formation of pulses of laser ignition.

A laser technological device is known, which contains a capacitor for storing a constant charge, several circuits for selecting the reactance value, a capacitor that is charged by the capacitor through the circuit, a lamp that, under the action of the charge accumulated by the capacitor, causes the laser radiation of the generator, when the circuit is selected, the charge accumulated by a capacitor, and the power of laser radiation [1].

A device for exciting a laser is known, comprising a generator generating pulses A for starting the thyristor switch of a lamp power source for pumping a laser, a delay circuit delaying the output pulses of the generator by a set time interval and giving pulses B for igniting the lamp, a logic circuit with two inputs pulses A, B and which gives output signals only if only pulse B is introduced into the circuit [2].

A disadvantage of the known devices is the low efficiency when operating in the frequency mode.

The closest technical solution (prototype) to the proposed invention is a pulse generator containing a power supply connected in series, a charging circuit with a high-voltage valve and a drive, the output of which is connected to a load through a controlled discharge lamp, and a voltage trailing edge voltage level control unit is connected to the drive output drive, and its output is connected to the control electrode of the discharge lamp [3].

A disadvantage of the known device is its low efficiency when operating in the frequency mode with the formation of a pump pulse of a given duration with a decrease in the lamp turn-off time.

Using the proposed technical solution, a new technical result is achieved, which consists in increasing the efficiency of the use of pumping of the OKG lamp by increasing the output power of the OKG.

In accordance with the invention, the technical result is achieved in that the device for pumping the laser, containing a power source, an ignition transformer and a pulsed lamp, further comprises N circuits from a diode and a capacitor connected in series, and N thyristors connected between the pulsed lamp and the cathode of the corresponding diode of each of the N circuits, as well as a parallel-connected isolation diode, a capacitor shunting and interconnected key and inductor, while the diode is isolated and connected in parallel with the lamp and the secondary winding of the pulse transformer ignition interconnected, and each of the N series-connected capacitor and a thyristor circuit.

In addition, the power source is made in the form of a capacitive storage.

In addition, the power source is made in the form of a battery.

In addition, the key is made in the form of a thyristor.

Figure 1 presents a block diagram of the proposed device for pumping laser, figure 2 - electrical diagram of the device, figure 3 is a timing diagram of the voltage pulse on the load.

The OKG pumping device comprises a power source 1, an ignition transformer 2, the secondary winding of which is connected to a pulse lamp 3; N circuits, each consisting of a series-connected capacitor 4 and diode 5 and each connected in parallel to the power source 1; N thyristors 6, each of which is installed between the cathode of the corresponding diode 5 and the pulsed lamp 3; as well as series-connected key 7 and inductor 8, connected in parallel to the shunt capacitor 9, parallel to the isolation diode 10 and parallel to the lamp pulse and secondary winding of the ignition transformer.

The device for pumping the laser works as follows.

Each of the N capacitors 4 is charged from a power source 1 to their nominal value. Using the pulse generated by ignition transformer 2, the pulsed lamp 3 is brought into a conducting state, the first of N thyristors 6 is opened and the first of N capacitors 4 dumps the energy of the first capacitor to the pulsed lamp 3, pumping.

After a certain time delay, the second of N thyristors 6 is turned on, connecting the second of N charged capacitors 2 to the pulsed lamp 3 and disconnecting the first capacitor. Thus, by alternately turning on the thyristors 6, the charged capacitors 4 are alternately connected to the pulsed lamp 3, forming an ignition pulse on it of the required duration and power.

When the key 7 is opened, the lamp 3 is shunted by current and the capacitors 4 are recharged. As a result of changing the polarity of the voltage across the thyristors, they quickly close, and the trailing edge of the pump pulse is shortened. This can significantly reduce the discharge time of the capacitors on the flash lamp, therefore, increase the repetition frequency of the inclusion of the generation of the lamp, which leads to an increase in the output power of the laser. In addition, the discharge of the first capacitor 4 is carried out not to zero, but to the U _threshold. ~ 1.5 kV, which allows it to start its subsequent charge not from zero, but from the U _threshold , thereby saving the power consumption of power source 1. To pump an OKG lamp, you need a power source with a capacity of several megawatts (depending on the type of lamp), which can be built on the basis of chemical current sources according to a combined scheme using molecular capacitors as a power sharpener and a high-voltage voltage source, acting as a buffer source of energy for the charge of molecular ondensators. Molecular capacitor batteries are created on the basis of capacitive storage devices of the type MNE - 3/60 or 24PP - 30 / 0.003; rechargeable batteries - 10NKB - 90, as a buffer source of energy.

Diodes 5 provide mutual isolation of capacitors 4 when operating from a single power source, thereby eliminating the need for a second power source. To implement the proposed pump circuit, diodes D133-400-40 can be used. As thyristors - T273-1250-40. Ignition transformer 2 is a pulse transformer, on the primary winding of which a pulse U1 = 4.5 kV with a duration of 3.4 μs is supplied, and an ignition pulse U2 = 30-35 kV of the same duration is formed on the secondary winding. The circuit is protected from a high-voltage ignition pulse using a shunt capacitor 9, which can be made on the basis of the capacitor KVI-4700-12 kV. As capacitors 4, K75-40 type capacitors can be used.

The proposed pump circuit of the OKG lamp allows the operation of a pulsed lamp with a frequency of 25-30 Hz, while the known schemes allow you to work with a frequency of 2-3 Hz.

From the above it follows that the proposed technical solutions have the following advantages compared to the known ones.

1. Ensuring the frequency mode of operation of the laser by reducing the time off the lamp with an increase in the frequency of repetition of the generation of the lamp.

2. An increase in the output power of the laser.

3. The economical consumption of energy from the power source due to the incomplete discharge of capacitors.

4. The formation of pump pulses of the required duration and power.

Therefore, the proposed device when used gives a new technical result, which consists in increasing the efficiency of the use of the pumping device for a pulsed laser lamp.

Based on the application materials, a prototype device was manufactured at the enterprise at the time, which, when tested, confirmed the achievement of the above technical result.

SOURCES OF INFORMATION

1. Japan, application No. 58-45839, MKI H 01 S 3/092, 1983

2. Japan, application No. 56-52473, MKI H 01 S 3/092, 1981

3. Copyright sv. USSR No. 785962, MKI N 03 K 3/53, 1980 (prototype).

4. Belostotsky B.R. et al. "Fundamentals of Laser Engineering", ed. Ak. Prokhorova A.M., Moscow: Sov. Radio, 1972

5. Shmelev KD, Korolev GV "Laser Power Supplies" ed. Vakulenko V.M., Moscow: Energy Publishing House, 1981

Claims (4)

1. A device for pumping laser gas containing a power source, a pulsed lamp and an ignition transformer, characterized in that N circuits from a diode and a capacitor connected in series are connected to the power source, N thyristors are connected between the pulsed lamp and the cathode of the corresponding diode each of N circuits, as well as a parallel-connected isolation diode, a capacitor shunting and interconnected key and inductor, while the isolation diode is connected in parallel to a connected lamp pulse and secondary winding ransformatora ignition. 2. The device according to claim 1, characterized in that in it the power source is made in the form of a capacitive storage. 3. The device according to claim 1, characterized in that in it the power source is made in the form of a battery. 4. The device according to any one of claims 1 to 3, characterized in that in it the key is made in the form of a thyristor.

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