JPS59500743A - Improved radio frequency laser pump system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Improved radio frequency laser pump system Technical field TECHNICAL FIELD This invention relates to a LADE system. In particular, this invention provides a radio frequency for high pressure gas lasers. Concerning wave pump systems.

Although the invention is described herein with reference to specific embodiments and specific applications, However, the present invention is not limited thereto. A person skilled in the art or using the disclosure of this invention If possible, please think of further variations and applications within the scope of this invention. Dew.

Background technology Early gas laser power supply 1rl Wattenbach (3,235,769) and Roebber (3,430,159). Sources and flood-cheap power sources were used. Goldsmith (3, 351, 8, 70), early systems were step-up transistors. rectifier circuits, vacuum tubes, pulsed collection networks and other inductors and switches. It was a high-voltage DC power supply with a power output of゛ Once the high-pressure gas radar was developed, this DC power source was used as a reliable source for starting the laser action. unsuitable in terms of reliability. In addition, modern high-pressure gas lasers can be used in outer space. They are inefficient, unreliable, and bulky for applications such as transportation. There was a drawback.

Radio frequency pumps are one approach to solving the problems associated with high pressure gas lasers. example For example, Laakmann (4,169,251) developed a gas laser using RF excitation. Disclosed. Typical RF pump high pressure laser has reliable laser action For example, a high electric field is required to perform the initiation. The electric field required at this start is It will also cost about three times as much.

Therefore, conventional RF pump structures require a constant element impedance matching circuit. This provides a high electric field at the start and impedance matching necessary for efficient operation. Adjustments are being made so that Such circuits typically have a 4:1 impedance The coil has a tapped LC resonant circuit to obtain a step-up. ing. In order to attempt such a configuration, these certain elements are present in the circuit at the beginning. In other words, optimization was not achieved in terms of efficiency. Therefore, the high electric field at the beginning and the constant Highly efficient energy transfer impedance between the power source and the lede medium during normal operation. - A high-pressure gas laser power source capable of dance matching was required.

Disclosure of invention The disadvantages of the prior art can be substantially overcome by the power supply of the present invention. As detailed below In addition to the high electric field required at start-up, this invention also requires high efficiency energy during steady-state operation. Laser action is initiated to obtain optimal impedance matching for transfer. It is designed to provide the ability to automatically readjust after

This invention matches the impedance of the laser cavity and the RF energy source. It has variable means for adjusting the temperature. Furthermore, changes in the impedance of the Rede cavity were detected. A means of release is provided. The detected change is the impedance of the matching circuit. is used to vary the irradiance and optimize the coupling between the laser cavity and the RF energy source. I'm trying to get it.

Brief description of the drawing This figure is an explanatory diagram of a preferred embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION This figure shows a laser 10 embodying the principles of the invention. That is, radio frequency (RF' ) It has an equivalent circuit 14 of a power source 12 and a Rede cavity 14. This RF turtle image source 1 It is an excellent type in the 2500 to 100 watt class.

A preferred embodiment of the invention is found between RFF source 12 and laser cavity 14. sand an amplifier coupled to receive the RF multiplied signal provided by the RFlli source 12; It has a coupler 16 that fits from the container 18. The output of the amplifier 18 is the one-turn inductor 2 0 and the negative winding inductor 20 is connected to the tap of the inductor 22.

Capacitor 24 is connected between the output of amplifier 18 and ground. amplifier 18, inductor 20, and capacitor 24, turnip 216 is a second winding. It has an inductor 26. This negative winding inductor 26 has one end connected through a resistor 28. and grounded. A capacitor 30 is connected between the other end of the inductor 26 and ground. It is connected. Coupler output at the connection point between inductor 26 and capacitor 30 is obtained. This coupler output is connected to one end of the RF choke 32, and the other end is connected to a negative voltage. connected to a power source (not shown). Furthermore, the coupler output has shot and keyed A diode or hot carrier detection diode 34 is connected. diode 34 The cathode of is connected to the resistor 36, the capacitor 38 and the second amplifier 40. Connected to a bond point. A second power supply to the amplifier 40 has one end connected to a positive potential source (not shown). ) and a variable resistor 42 whose other end is grounded. this amplifier The output of 40 connects a resistor 44 whose free end is grounded and a feedthrough capacitor 48. It is connected to the second RF station 46 via the second RF station 46. The resistor 44 is the D of the operational amplifier 40. C provides a return route. Resistor 42 provides the amplifier 400 reference potential. Feedsle - The free end of capacitor 48 is also grounded. The free end of the RF choke 46 is a series is connected to varactor diodes 50 and 52 of. Roses as shown The cathode of the cutter diode is connected to the coupling point with the RF choke 46. da The anode of the iode 5o is connected to the canopy 4-shita 54. Capacitor 54 The free end of the diode 52 and the anode of the diode 52 are connected across both ends of the inductor 22. be done. The anode of diode 52 and inductor 22 are further grounded. child The output of the power supply of the invention is taken from the intersection between the capacitor 54 and the inductor 22. be done. This output is connected to the level represented by capacitor 56°58 and resistor 60. is connected to the user equivalent circuit 14. Table 1 shows the parameters of each part shown.

20 and 26 1 volume 30 nH 22300~500nH 462,5μH 38200pf 48 200 pf 50 and 52 1 to 2 pf 56 2 to 3 pf 58 0.25 to 0.5pf resistance 2850Ω 363Ω 42 Ω to 10 44 Ω to 20 0 diode 34 zRF-50Ω amplifier 18 RF amplifier 50 to 100W 150MHz 40 High voltage DCOP amplifier During operation, no gas discharge is initiated, so the gas in the laser cavity 14 is not ionized. Instead, the laser tube becomes electrically equivalent in appearance to the capacitor 56. This canogu 56 is a function of laser length, electrode width, electrode separation, and dielectric material of the laser hole. Has capacitance.

Inductor 22, capacitor 54 and varactor diodes 50 and 52 The tuned circuit thus constructed includes a canister 54 and a varactor diode 50. As a result of the bias voltage +vB at the cathode junction between It is preset by the equivalent series capacitance of diodes 50 and 52. varactor The capacitance of diodes 50, 52 and capacitors 54 and 56 is It resonates with the inductor 22 of the RF frequency that drives the decoder. Resonance of circuit 21 The maximum voltage of radar 14 is guaranteed and radar 14 is turned on.

When laser action is initiated, circuits 58 and 60 are added in parallel with tuned circuit 2. This lowers the resonant frequency and reduces the load Q. The tank circuit 21 is removed from resonance. , impedance mismatch at RF#t12 in the tapping coil 22 occurs. Directional coupler 16 detects increased reflected waves due to misalignment. The reflected wave is this It is the object of the invention to exhibit return losses to be minimized. When a reflected wave is detected, the reflected wave identifies forward power and reflected power. The coupler receives the reflected power and outputs it. is supplied to the diode 34. Diode 34 and RF choke 32 negative D The connection with C potential is released. This diode 34 has a current of approximately 100 μA. Biased with current for controllable sensitivity and impedance. coupler 16 The output of turns on diode 34 and is provided by resistor 36 and capacitor 38. generates a signal to a low-pass filter. The filtered voltage representing the return p loss The air signal is supplied to an amplifier 4o and amplified. This signal is sent to the RF choke 462 and feed through capacitor 48 to varactor diode 50. It will be backed up. The RF tail 46 and feedthrough capacitor 48 provide RF isolation. The DC signal is passed through the varactor diode and disconnected from the AC. electric The voltage VB is the laser cavity with a capacitance of 14 of the varactor diodes 50 and 52. The increase in capacitance 58 from amplifier 40 is reduced by an amount equal to the increase in capacitance 58 of Increased by feedback. The circuit resonates again. RF source impedance is again with varactor diodes 50 and 52 clamped to the correct voltage +vB. Match. This circuit has a varactor in a direction that causes the tuning circuit 21 to resonate. Maintain correct bias on the diodes. Therefore, this circuit is a self-stabilizing circuit. By keeping the RF driving force constant, the laser output can be kept almost constant.

Although preferred embodiments have been described, the invention is not limited thereto. So A person of ordinary skill in the art who has access to the disclosure of this invention will understand the scope of this invention. Inside, you can come up with all the deformed sequences. For example, the decoupling circuit 16 is 1/ The present invention may be modified to a four-wavelength transmission line without departing from the scope of the invention. You can get the benefits of Furthermore, the Schottky or Hollow used in the embodiments of this invention A zero-pass diode can also be used instead of a zero-pass carrier diode. Ru. Obviously, other 0-z4 filters or other suitable filters may be used without departing from the scope of this invention. A variable resonance circuit can be used. Therefore, the present invention provides the above-mentioned modified sequence and and all other variant sequences contemplated by the attached claims. .

Procedural amendment February ρ, 1982 PCT/uS 83100677 2 Name of the invention Improved Wireless Layering - Deponging System 3. Person who makes corrections Relationship with the incident: Special: i-F Roto Nominal name/Fuse/Aircraft/Tampa 215 Date of amendment order 13s>January 31, 059 international search report Special table 59-500743 (5th edition)

Claims (1)

[Claims] 1. Variable impedance to match the impedance of the laser cavity with the RF energy source In a radar power supply that uses M as a pedance matching means, means for detecting impedance changes in the Rade cavity; and: said variable impedance in response to a detected change in impedance of said Rade cavity; means for changing the impedance of the dance matching means to enhance starting; the RF source is optimally coupled to the laser cavity to facilitate optimal energy transfer; An improved laser power supply featuring: 2. The variable impedance means has a variable capacitor. Rede power source according to scope 1 of the request. 3. The means for detecting the impedance change of the laser cavity has a directional coupler. The laser power source according to claim 2, characterized in that: 4. The means for changing the impedance of the variable impedance matching means marked with # is is amplified by the variable capacitor corresponding to the impedance change of the laser cavity. The apparatus according to claim 3, further comprising means for supplying an RF isolated C signal. Rade power supply included. 5. Set the impedance of the laser cavity to the variable capacitor/mother NL and the RF energy source. variable impedance matching means for matching; Means having a directional coupler and detecting changes in impedance of the Rede cavity and the torso. and; the variable capacitor corresponding to the detected impedance change of the laser cavity; means for supplying an RF-isolated DC signal amplified by the variable capacitor; The impedance of the matching means used to change the resistance to increase the reliability of starting and drive the gas laser. An improved RF laser pump system that efficiently performs 6. The means for matching the impedance of the Rade cavity includes an inductor and a key. The system according to claim 5, which is an FLJ circuit having a capacitor. Tem. 7. The means for detecting the impedance change of the laser cavity is a Rono or Nufilter. 7. The system according to claim 6, comprising: 8. Claim characterized in that the directional coupler is a one-turn inductor tax. The system described in 7. 9. The means for changing the impedance of the impedance matching means is amplification. RF choke and feed-through capacitor'kN The system according to claim 7. 10. The means for detecting the change in impedance of the Rede cavity includes the low 14th stage. further comprising means for controlling the sensitivity and impedance of the filter. The system according to claim 9. Book of exhortations (contents not changed)