CN1005371B - Pulse emission tube laser shutter driver - Google Patents
Pulse emission tube laser shutter driver Download PDFInfo
- Publication number
- CN1005371B CN1005371B CN87104394.7A CN87104394A CN1005371B CN 1005371 B CN1005371 B CN 1005371B CN 87104394 A CN87104394 A CN 87104394A CN 1005371 B CN1005371 B CN 1005371B
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- China
- Prior art keywords
- pulse
- laser
- tube
- electro
- shutter driver
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention relates to a laser shutter driver of a pulse transmitting tube, belonging to the technical field of laser modulation, solving the problems in the laser pulse modulation technology, and simultaneously having high switching speed (nanosecond level), high repeated switching speed (megahertz level) and high working voltage (7 KV). Because of using the ordinary commercial electronic tube element-pulse transmitting tube, the invention has the characteristics of high reliability, long service life and low cost.
Description
The invention belongs to the technical field of laser modulation.
A shutter is an electro-optical modulator with a modulation degree of 100%. When the laser is used in a laser cavity to generate short pulse radiation by the Q mutation principle, the laser is often called a Q switch. As is well known, the typical focal-length shutter is generally used at a switching voltage (half-wave voltage) of 3-7KV, which is dependent on the electro-optic crystal and the mode of operation, and requires a switching speed of the order of nanoseconds (ns), and in many applications, 10KH is requiredz(mostly continuous pulse lasers) or even 1MHzThe above switching rates (e.g., a sequential pulse laser). An optical shutter having these three properties has been a goal sought. There are three types of electro-optical crystal switch (also called pockels cell) driving circuits used in the prior art at home and abroad: one thyristor (including thyristor) circuit, which has response speed and repetition rate not meeting the above requirements, and two trigger tube circuit (like domestic cold cathode trigger tube and U.S. KN22 trigger tube), which has speed meeting the requirements, but is basically a one-time or low repetition rate device (up to several hundred H)z) The multi-stage avalanche transistor circuit can reach the speed of ns level, but works by means of a multi-stage serial or parallel MARX (MARX) circuit, so that the multi-stage avalanche transistor circuit is not suitable for high-voltage and high-speed work, and has strict requirement on the consistency of the transistor, low service life and poor reliability. Therefore, a practical optical switch having three technical indexes of high speed, high speed and high voltage has been one of the difficulties in the optoelectronic technology.
The invention solves the technical problems, fully develops the laser pulse light gate driver with high speed, high speed and high voltage technical indexes by utilizing a common commercial electron tube element, namely the pulse transmitting tube, and has the characteristics of high reliability, long service life and low cost.
The driver reachesThe core device of the three-high technical index (also the core device adopted by the invention) is a small-sized high-speed pulse oscillation tube, which is a pulse beam-emitting tetrode, has small interelectrode capacitance, is applied to the optimal state aiming at the load condition, and properly utilizes the volt-ampere characteristic and a proper pulse trigger circuit to develop the potential. For resistive loads, the technical indexes that can be achieved for capacitive loads within 100Pf are, not necessarily, that: the maximum switching speed is 1-2 ns, generally not more than 5ns, and the pulse repetition rate is 100KHz～1MHz(potential up to 10 MH)z) The driving voltage is 3-7KV, which is suitable for continuous repetitive pulse driving, single-side driving or double-side differential driving, and the common electro-optical crystal switch Pockels cell can be regarded as a capacitance load, generally < 10 Pf.
The ordinary pockels optical gate is composed of a voltage driver and an electro-optical crystal, and the optical switching action is realized by the pockels effect (linear electro-optical effect). The technical key is a driver, and the basic circuit forms of the driver are two types, which are respectively shown in a figure (1) and a figure (2).
The figure shows a single-side drive scheme, which is used in a pulse-reflection (PRM) Q-switched laser. (1) The device comprises a trigger circuit, (2) an electronic switch tube-pulse transmitting tube unit, (3) an isolator, (4) a capacitor, (5) an electro-optical crystal component-Pockels cell, and (6) a high-voltage direct-current power supply. Due to the rapid characteristic of the pulse transmitting tube (2), the electro-optic crystal component (equivalent to a capacitor) obtains a transmission rate function of a single-side rapid front edge, thereby playing a role of a rapid optical shutter.
The second diagram is a bilateral differential mode, which can be used in the cavity emptying technology of laser and the mode-locked optical pulse selector. (2) And (7) is an electronic switching tube-pulse transmitting tube unit, (3) and (8) are isolators, (4) and (11) are capacitors, (5) is an electro-optical crystal assembly, and (10) is a high voltage direct current power supply. The invention enables the electro-optic crystal component to obtain the transmittance function of a quick front edge and a quick back edge, such as rectangular pulse or single-side trapezoidal pulse, rectangular or single-side trapezoidal pulse with asymmetrical front and back edge amplitudes, and the like.
The driver is also suitable for forming square pulses using a transmission line or BLUMLEIN (BLUMLEIN) circuit.
Claims (2)
1. A laser shutter driver of a pulse transmitting tube is composed of a trigger (1), an electronic switching tube (2), an isolator (3), a capacitor (4) and an electro-optical crystal component (5), and is characterized in that the electronic switching tube (2) adopts a high-speed pulse oscillation tube, and the load of the high-speed pulse oscillation tube is an electro-optical or acousto-optical crystal equivalent to the capacitor.
2. Driver according to claim 1, the circuit being used in a differential dual-side drive, characterized by an access trigger (9), an electronic switch (7), an isolator (8), a capacitor (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87104394.7A CN1005371B (en) | 1987-06-25 | 1987-06-25 | Pulse emission tube laser shutter driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN87104394.7A CN1005371B (en) | 1987-06-25 | 1987-06-25 | Pulse emission tube laser shutter driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87104394A CN87104394A (en) | 1987-12-23 |
| CN1005371B true CN1005371B (en) | 1989-10-04 |
Family
ID=4814859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87104394.7A Expired CN1005371B (en) | 1987-06-25 | 1987-06-25 | Pulse emission tube laser shutter driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1005371B (en) |
-
1987
- 1987-06-25 CN CN87104394.7A patent/CN1005371B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN87104394A (en) | 1987-12-23 |
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| C10 | Entry into substantive examination | ||
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| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |