CN2456340Y

CN2456340Y - Voltage regulating power supply for laser regulating Q value

Info

Publication number: CN2456340Y
Application number: CN 00266297
Authority: CN
Inventors: 汪建业; 岳古明
Original assignee: Anhui Institute of Optics and Fine Mechanics of CAS
Current assignee: Anhui Institute of Optics and Fine Mechanics of CAS
Priority date: 2000-12-29
Filing date: 2000-12-29
Publication date: 2001-10-24
Anticipated expiration: 2010-12-29

Abstract

The utility model discloses a voltage regulating power supply for laser switching Q values. The utility model comprises an electro-optical crystal in a laser oscillation circuit and a Q-switching power supply which is composed of a switching power supply control circuit and a voltage doubling circuit and is electrically connected with the electro-optical crystal, and particularly, the Q-switching power supply is also provided with a time delay circuit and a subsequent boosted circuit, wherein, the time delay circuit is electrically connected with the switching power supply control circuit, and the boosted circuit is electrically connected with a voltage reducing switch. Both ends of the electro-optic crystal are connected in parallel with the voltage reducing switch, and a current-limiting resistor is connected in series between the Q-switching power supply and the electro-optic crystal. The utility model has the characteristics that the utility model has simpleness and reliability and can effectively improve the service life of the electro-optical crystal.

Description

Laser Q-switching voltage regulating power supply

The utility model relates to a kind of laser Q-switching voltage regulating power supply.

In the Solid State Laser technology, for the squeezed light pulse duration, improve the peak power of laser, generally use electric-optically Q-switched technology at present.It is in the laser generation loop electrooptic crystal to be set, and by regulating the output voltage of the accent Q power supply be connected with this crystal current, laser generation is formed and exports a giant pulse.Now the high voltage pulse circuit be made up of switching power source control circuit and voltage-multiplying circuit of Chang Yong accent Q power supply constitutes.Its weak point is, electrooptic crystal is in entire work process, and the overwhelming majority times have been coupled with half-wave voltage, and this voltage is general all up to several kilovolts, because high pressure makes its electrical insulation capability variation and very easily damages for a long time.

The purpose of this utility model provides a kind of laser Q-switching voltage regulating power supply that only just pressurizes to electrooptic crystal when needed.

For achieving the above object, the utility model comprises electrooptic crystal in the laser generation loop and the accent Q power supply that is made of switching power source control circuit and voltage-multiplying circuit that is electrically connected with it, particularly transfer the Q power supply also with delay circuit and follow-up booster circuit, described delay circuit is electrically connected with switching power source control circuit, described booster circuit is electrically connected with moving back to compress switch, the two ends of electrooptic crystal are connected in parallel to move back and compress switch, and transfer between Q power supply and electrooptic crystal and are connected in series current-limiting resistance.

As further improvement of the utility model, described delay circuit be delay integrated circuit piece IC1 4., the pin meets Tin, 2., the pin meets power supply V1 with the  pin respectively behind resistance R 1, R2,1., pin ground connection, capacitor C 1, C2 respectively cross-over connection 1., 2. between pin, , pin, 10. pin connects switching power source control circuit, and 7. pin connects the grid of the field effect transistor Q2 in the booster circuit through resistance R 4; Described booster circuit is that the grid of power field effect pipe Q2 connects delay circuit, source ground, drain electrode and meets power supply V2 through resistance R 9, the elementary parallel diode D1 of transformer Tr2 is after the source of capacitor C 4 cross-over connection field effect transistor Q2, drain electrode two ends, and a secondary end ground connection, the other end meet output Tout through resistance R O.

After adopting such structure, owing to transfer the Q power supply also with delay circuit and follow-up booster circuit, make after laser pulse signal arrives, can trigger the high voltage pulse circuit work that constitutes by switching power source control circuit and voltage-multiplying circuit earlier, in the extremely short time, to add high pressure to electrooptic crystal, afterwards, trigger booster circuit by delay circuit again and promote to move back the closure that compresses switch, simultaneously the turn-off pulse high-tension circuit; Be connected in parallel on the two ends of electrooptic crystal owing to moving back to compress switch again, when it is closed, just can decorporate moment and be added in high pressure on the electrooptic crystal, both export the Q-switch laser giant pulse, disconnected the high voltage that is added on the electrooptic crystal again, prolonged the useful life of electrooptic crystal effectively; Again because the employing of current-limiting resistance, make and moving back when compressing switch closure that output current that can the paired pulses high-tension circuit is contained, has avoided the damage to it.

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.

Fig. 1 is a kind of basic structure schematic diagram of the present utility model.

Fig. 2 transfers Q power principle figure among Fig. 1.

With reference to Fig. 1, Fig. 2, the output Hv that transfers Q power supply 1 behind current-limiting resistance R with moving back 2 cross-over connections that compress switch in the two ends of electrooptic crystal 3, its another output Tout with move back 2 the actuating coil of compressing switch and be electrically connected.The input termination Tin, the output that are connected the delay circuit 11 that the back constitutes with resistance R 1, R2, R4, capacitor C 1, C2 by delay integrated circuit piece IC1 (label is 4538) connect respectively by integrated circuit block IC2 (label is 3525) and are main warp switching power source control circuit 12 that connects and composes and the booster circuit 14 that is made of after being connected power field effect pipe Q2, resistance R 9, R0, capacitor C 4, diode D1, transformer Tr2, wherein, be connected to voltage-multiplying circuit 13 behind the switching power source control circuit 12, the output of this voltage-multiplying circuit 13 is Hv, and the output of booster circuit 14 is Tout.

During use, after laser pulse signal Tin arrives, elder generation's trigger impulse high-tension circuit work, make it add high pressure Hv in 1 millisecond time, for electrooptic crystal 3, simultaneously, this signal Tin triggers to move back via delay circuit 11 time-delay back and compresses switch 2 and the high voltage pulse circuit, successively makes and moves back 2 closures that compress switch, instantaneous decorporating is added in high pressure on the electrooptic crystal 3, and disconnects high pressure HV.

Claims

1, a kind of laser Q-switching voltage regulating power supply comprises electrooptic crystal (3) in the laser generation loop and the accent Q power supply (1) by switching power source control circuit (12) and voltage-multiplying circuit (13) formation that is electrically connected with it, it is characterized in that:

1.1 transfer Q power supply (1) also with delay circuit (11) and follow-up booster circuit (14), described delay circuit (11) is electrically connected with switching power source control circuit (12), described booster circuit (14) is electrically connected with moving back compress switch (2),

1.2 being connected in parallel, the two ends of electrooptic crystal (3) move back compress switch (2),

1.3 transfer between Q power supply (1) and electrooptic crystal (3) and be connected in series current-limiting resistance R.

2, power supply according to claim 1, it is characterized in that delay circuit (11) for delay integrated circuit piece IC1 4., the pin meets Tin, 2., the pin meets power supply V1 with the  pin respectively behind resistance R 1, R2,1., pin ground connection, capacitor C 1, C2 respectively cross-over connection 1., 2. between pin, pin, 10. pin connects switching power source control circuit (12), and 7. pin connects the grid of the field effect transistor Q2 in the booster circuit (14) through resistance R 4.

3, power supply according to claim 1, it is characterized in that booster circuit (14) meets power supply V2 for the grid of power field effect pipe Q2 connects delay circuit (11), source ground, drain electrode through resistance R 9, the elementary parallel diode D1 of transformer Tr2 is after the source of capacitor C 4 cross-over connection field effect transistor Q2, drain electrode two ends, and a secondary end ground connection, the other end meet output Tout through resistance R O.