WO2006061891A1 - レーザダイオード励起固体レーザ発振器および該発振器におけるレーザダイオード制御方法 - Google Patents
レーザダイオード励起固体レーザ発振器および該発振器におけるレーザダイオード制御方法 Download PDFInfo
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- WO2006061891A1 WO2006061891A1 PCT/JP2004/018291 JP2004018291W WO2006061891A1 WO 2006061891 A1 WO2006061891 A1 WO 2006061891A1 JP 2004018291 W JP2004018291 W JP 2004018291W WO 2006061891 A1 WO2006061891 A1 WO 2006061891A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/102—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1022—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/0602—Crystal lasers or glass lasers
- H01S3/061—Crystal lasers or glass lasers with elliptical or circular cross-section and elongated shape, e.g. rod
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/07—Construction or shape of active medium consisting of a plurality of parts, e.g. segments
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/09408—Pump redundancy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/101—Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/131—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1312—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06825—Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4018—Lasers electrically in series
Definitions
- the present invention relates to the configuration and control of a solid-state laser oscillator having a function of avoiding stoppage of a laser oscillator due to a failure of a laser diode (hereinafter referred to as LD) and a function of correcting output decrease.
- LD laser diode
- FIG. 9 is a diagram showing a configuration of an LD-pumped solid state laser oscillator.
- the solid laser oscillator is composed of one or two or more cavities 3 sandwiched between two mirrors, a partial reflection mirror 1 and a total reflection mirror 4, and a desired laser beam 5 It is a device to take out.
- Figure 10 shows a schematic diagram of the cavity.
- the cavity 3 is configured so that the solid excitation medium 7 is excited by the light emitted from the excitation light source LD6.
- FIG. 9 shows a laser oscillator having two cavities.
- the LDs 6 are arranged so that several tens and hundreds are connected in series according to the output of the laser oscillator, the output per LD, etc., and the solid excitation medium 7 is uniformly excited.
- the laser power that can be extracted from one solid-state excitation medium is the volume of the solid-state excitation medium 7 through which the laser beam in the resonance state can pass (the shaded portion in FIG. 10 and hereinafter referred to as the mode volume).
- the mode volume 21 increases and decreases as the output of LD6 increases and decreases.
- the excitation distribution of the solid excitation medium 7 is uniform, the mode volume exists substantially uniformly with respect to the central axis 10 of the solid excitation medium 7 as shown in FIG.
- the laser output with a cavity power is approximately proportional to the LD output
- the LD output is approximately proportional to the LD conduction current.
- a method of controlling the LD current is generally used.
- a solid-state laser oscillator that desires a high output employs a configuration in which a plurality of cavities are arranged between a partial reflection mirror and a total reflection mirror to obtain a laser output that is the sum of the respective cavities.
- the failure mode of LD6 has short circuit and open.
- the LD 6 does not emit light and a non-excited portion is generated in the solid excitation medium 7.
- the mode volume 21 is reduced, and the laser beam output from the laser oscillator is reduced.
- a method of compensating for the decrease in the laser beam output a method of correcting the laser beam output by increasing the LD energization current and exciting the solid excitation medium 7 as a whole more strongly is employed.
- Patent Document 1 Patent Document 2, etc.
- a method is generally used in which the LD6 is connected in series, a bypass circuit is provided in parallel with each LD6, and the LD6 forms a current path during an open fault. Since the bypassed LD6 is extinguished, the laser output decreases.
- Patent Document 1 Japanese Patent Laid-Open No. 10-284789
- Patent Document 2 Japanese Patent Application Laid-Open No. 59-103565
- Figure 11 (a) shows the mode volume when one LD is extinguished and the solid excitation medium is not uniformly excited.
- the laser beam 5 in the solid excitation medium 7 is strongly excited due to non-uniform excitation, curving in the opposite direction, and V ⁇ loose pointing Deviation occurs.
- the mode volume 21 cannot be uniformly distributed with respect to the central axis 10 of the solid excitation medium. Since the mode volume 21 cannot normally exist outside the solid excitation medium 7, when the output of the LD 6 is increased, the shape of the mode volume 21 as shown in Fig. 11 (b) is not obtained. The shape is as shown in Fig. 11 (a). Therefore, in FIG. 11 (b), the laser output is reduced by an amount substantially corresponding to the mode volume 21 protruding outside the solid excitation medium 7 and the excitation efficiency is deteriorated. Therefore, in order to obtain the original laser output, that is, to obtain the original mode volume 21, it is not necessary to supply the total power before the failure, and it is necessary to supply more power.
- FIG. 12 illustrates the case of a solid-state laser oscillator in which a plurality of cavities are arranged in series between mirrors in order to obtain a high output.
- the mode volume 21 of the cavity has a force similar to that shown in FIG. 11 (a) as shown in FIG.
- pointing deviation occurs as in the case of the cavity with the LD20 turned off.
- the mode volume 21 is shaped so as not to protrude from the solid excitation medium 7, so that the volume is reduced and the excitation efficiency is lowered.
- the degree of decrease is almost the same level as the decrease in excitation efficiency of the cavity whose LD is extinguished.
- Patent Document 3 Japanese Patent Laid-Open No. 59-113768
- the present invention has been made to solve the above-described problems, and is necessary for recovery of laser output even when a failure occurs in the LD and a decrease in excitation efficiency due to a pointing error occurs. It is possible to obtain an LD-excited solid-state laser oscillator that can suppress the increase in current flowing to the LD.
- a solid-state pump medium In the LD-pumped solid-state laser oscillator according to the present invention, a solid-state pump medium, a plurality of laser diodes arranged around the solid-state pump medium and irradiating the solid-state pump medium with pump light, and a defect of the laser diode
- a control unit that determines a position of a laser diode that has detected a defect by the detection unit and controls a supply current to another normal laser diode according to the position of the laser diode in which the defect has occurred. It is equipped with means.
- the present invention corrects the bias of the pumping distribution in the solid pumping medium by adjusting the output of another normal LD based on the position of the LD where the defect has occurred, thereby providing a predetermined laser. It is possible to suppress an increase in the LD energization current for obtaining output.
- FIG. 1 is a configuration diagram of an LD-pumped solid-state laser oscillator showing Embodiment 1 of the present invention.
- FIG. 2 is a flow chart of LD short-circuit control of the LD-pumped solid-state laser oscillator according to the first embodiment of the present invention.
- FIG. 3 is a diagram for explaining the number of directions in a general LD-pumped solid-state laser oscillator.
- FIG. 4 is another flowchart of LD short-circuit control of the LD-pumped solid-state laser oscillator according to the first embodiment of the present invention.
- FIG. 5 is another flowchart of LD short-circuit control of the LD-pumped solid-state laser oscillator according to the first embodiment of the present invention.
- FIG. 6 is a diagram for explaining the relationship between the LD energization current and the LD excitation light output in a typical LD excitation solid-state laser oscillator.
- FIG. 7 is a diagram for explaining the relationship between the number of LDs turned on and the laser output of the oscillator of the LD-pumped solid-state laser oscillator according to the first embodiment of the present invention.
- FIG. 8 is a diagram for explaining improvement of pointing deviation in the solid excitation medium in the first embodiment of the present invention.
- FIG. 9 is a schematic diagram of a general LD-pumped solid-state laser oscillator.
- FIG. 10 A schematic diagram of the cavity of a typical LD-pumped solid-state laser oscillator.
- FIG. 11 is a diagram for explaining a pointing deviation in a solid excitation medium.
- FIG. 12 is a diagram for explaining a pointing deviation in a solid excitation medium when two cavities are connected.
- FIG. 13 is a graph showing a correlation between an energization current and a life of an LD.
- FIG. 1 is a configuration diagram of an LD-pumped solid-state laser oscillator provided with an LD short-circuit control device as an embodiment of the present invention.
- a laser oscillator is shown in which a solid excitation medium is pumped by a total of 10 LDs from 5 directions to 2 directions in one cavity.
- LD6a-6j are connected in series, emit light by the direct current output from the power supply device 12, and the solid excitation medium 7 by the excitation light 22.
- a bypass circuit 15a-15j is connected in parallel with each LD6a-6j, and the drive of each bypass circuit 15a-15j is controlled by a control circuit 14a-14j.
- Each LD 6a-6j is provided with a detection circuit 13a-13j in parallel to detect a short circuit or open circuit failure of the LD by the voltage across the LD.
- this detection circuit for example, the method described in Patent Document 4 may be used.
- These detection circuits 13a-13 ⁇ 4 and control circuits 14a-14j are connected to the LD short-circuit control device 11 and exchange detection signals and control signals.
- the LD power control device 18 controls the ON / OFF of the oscillator and the laser output.
- Patent Document 4 Japanese Patent Application No. 2003-363040
- the configuration using the detection circuit that detects a short circuit or open circuit failure of the LD by the voltage across the LD as the detection means has been described.
- the detection circuit using the photodiode described in Patent Document 1 is used.
- the optical thyristor described in Patent Document 2 may be used. Any means for detecting an LD short-circuit or open-circuit failure is not particularly limited to these configurations.
- the LD short-circuit control device 11 is provided with a determination unit 8 and a control unit 9.
- the determination unit 8 receives a signal that the detection circuit 13 has detected that the LD has failed, determines which LD has failed, and then determines which LD to correct the bias of the excitation distribution in the solid excitation medium. It is determined whether the LD should be short-circuited, and the position information of each LD is sent to the control unit 9.
- the control unit 9 controls the control circuit 14 of the bypass circuit 15 to be driven to drive the bypass circuit 15 of the failed LD and the LD bypass circuit 15 to be short-circuited next based on the position information from the determination unit 8. Send a signal.
- the output of the laser beam is controlled as follows.
- a half mirror 16 is arranged on the optical path of the laser beam 5 emitted from the partial reflection mirror 1, and a part of the laser beam 5 reflected by the half mirror 16 is received by the power sensor 17, and the output is measured.
- the value detected by the power sensor 17 is sent to the LD power control device 18.
- the LD power controller 18 compares the actual output value of the laser beam 5 calculated from this detected value with the desired laser beam output value, and supplies the power to the LD so that the actual output value becomes the desired output value.
- the power supply 12 is controlled to adjust the power.
- the detection circuit 13a detects an open or short circuit failure of the LD 6a
- the detection signal force SLD is sent to the determination unit 8 of the short circuit control device 11.
- the determination unit 8 determines the position of the failed LD 6a and passes the position information of the failed LD 6a to the control unit 9. (S002)
- control unit 9 Based on the received location information of the failed LD 6a, the control unit 9 sends a short circuit signal to the control circuit 14a that bypasses the current of the LD 6a.
- control circuit 14a When the control circuit 14a receives the short circuit signal, the control circuit 14a operates the bypass circuit 15a to short-circuit the LD 6a. As a result, current flows through the bypass circuit 15a, and the other LD6b-6j continues to emit light without being turned off. (S003)
- the determination unit 8 determines whether the number of directions is even or odd. (S004)
- the number of directions is a numerical value indicating how many directions the LD 6 irradiates the solid excitation medium 7 with excitation light.
- Figures 3 (a) and 1 (d) show the cavity viewed from the optical axis direction of the laser beam, but Fig. 3 (a) shows a case where two-way force excitation light is applied and the number of directions is 2. is there. Similarly, Fig. 3 (b) shows the case of 3 directions, (c) shows 4 directions, and (d) shows 6 directions.
- the LDs 6 are arranged at equiangular intervals around the solid excitation medium 7 as shown in FIG.
- the determination unit 8 determines that the number is even.
- the judgment unit 8 selects the next LD to be short-circuited based on the position information of the failed LD 6a.
- Fig. 3 (e) shows the cavity viewed from the side.To improve the pointing deviation, the cavity is located on the same plane S perpendicular to the central axis 10 of the solid excitation medium with respect to the position of the failed LD20. A certain LD23 can be turned off.
- the number of directions is an even number, turn off the failed LD20 and the LD23 at the opposite position on the same plane perpendicular to the central axis 10 of the solid excitation medium.
- the number of directions 2, 4, and 6 it is fixed to the failed LD20 shown in Fig. 3 (e) in the shaded rows in Figs. 3 (a), (b), and (d).
- the determination unit 8 passes the position information of the LD 6f to the control unit 9.
- the control unit 9 Based on the received positional information of the LD 6f to be short-circuited, the control unit 9 sends a short-circuit signal to the control circuit 14f that bypasses the current of the LD 6f.
- control circuit 14f When the control circuit 14f receives the short circuit signal, the control circuit 14f operates the bypass circuit 15f to short-circuit the LD 6f. As a result, LD6f does not reach the threshold current and is extinguished, and LD6b-6e and LD6g-6j continue to emit light.
- the LD power control device 18 controls the power supply device 12 while feeding back the measured value of the power sensor 17 so as to recover the laser output reduced by turning off the LD to a desired laser output. Adjust the energizing current. (S007)
- steps S001 to S007 are repeated until the oscillator is stopped.
- step S005 when the number of directions is even, the LD facing the extinguished LD is extinguished. However, as in the case where the number of directions is odd, the central axis of the solid excitation medium including the facing LD Pointing deviation can be improved even if all LDs on the same plane perpendicular to are turned off. However, in this case, for example, in the direction number 4 shown in Fig. 3 (c), the four LDs including the failed LD are turned off, and the load on other normal LDs is large when returning the laser output. Become. If the number of directions is even, the pointing can be improved by turning off only the LD that faces the failed LD.
- the number of directions is determined by the determination unit 8.
- the number of directions is usually determined as a design value of each laser oscillator, the number of directions is also determined by the determination unit 8.
- the LD that is to be extinguished next is selected and the LD
- the power of the short-circuited circuit is as follows: First, determine the position of the failed LD and the next LD to be turned off, and then connect each failed control circuit to short-circuit the failed LD and the next turned-off LD. A signal may be sent.
- the operation flow in this case will be described with reference to FIG. In FIG. 5, the same step number is described for the step having the same contents as the operation of FIG.
- the detection circuit 13 While the oscillator is in operation, the detection circuit 13 always monitors the voltage across LD6 to check for the presence of an LD failure. (S001)
- the detection circuit 13a detects an open or short circuit failure of the LD 6a
- the detection signal force SLD is sent to the determination unit 8 of the short circuit control device 11.
- the judgment unit 8 judges the position of the failed LD 6a. (S002)
- the determination unit 8 determines whether the number of directions is an even number or an odd number. (S004)
- the judgment unit 8 selects the next LD to be short-circuited based on the position information of the failed LD 6a. If the number of directions is an even number, select LD23 at the position opposite to the failed LD22. (SO 11)
- LD6f is the LD that should be short-circuited.
- the determination unit 8 passes the position information of the LD 6a and LD 6f to be short-circuited to the control unit 9.
- the control unit 9 sends a short circuit signal to the control circuit 14a and the control circuit 14f that bypass the current of the LD6a and LD6f based on the received position information of the failed LD6a and the position information of the LD6f to be turned off.
- the control circuit 14a When the control circuit 14a receives the short circuit signal, the control circuit 14a activates the bypass circuit 15a to shorten the LD6a. Get involved.
- the control circuit 14f When the control circuit 14f receives the short circuit signal, the control circuit 14f operates the bypass circuit 15f to short-circuit the LD 6f. As a result, current flows through the bypass circuits 15a and 15f, the LD6f does not reach the threshold current, and is turned off. The LD6b-6e and LD6g-6j continue to emit light without being turned off. (S013)
- the LD power control device 18 controls the power supply device 12 while feeding back the measured value of the power sensor 17 so as to recover the laser output decreased by turning off the LD to a desired laser output. Adjust the energizing current. (S007)
- steps S001 to S007 are repeated until the oscillator is stopped.
- bypass circuit is operated even when the LD is short-circuited.
- a LD has a short-circuit fault
- current continues to flow, so it is not always necessary to operate a no-pass circuit that does not affect other normal LDs.
- FIG. Figure 6 is a correlation diagram of the LD current and LD output. LD also starts to output LD light with threshold current I force.
- ⁇ is the ratio of the LD output to the conduction current.
- Figure 7 is a correlation diagram of the number of LD lighting and laser output. If the number of currently lit LDs is n, the laser output P is as follows.
- the LD power control device sets the laser output LD to the power supply unit so that it follows the command value P.
- the value of the command current I is a constant in the second term on the right side, and the first term
- the LD is turned off by driving a bypass circuit provided in parallel with a normal LD so that the excitation balance is uniform. This suppresses an increase in the LD conduction current to obtain the original laser output, and suppresses a decrease in the LD life.
- the excitation distribution is biased.
- the beam is strongly excited and curves in the direction of the beam, causing a pointing shift on the opposite side of the extinguished LD. Therefore, as shown in FIG. 8, the failed LD 20 and the LD 23 arranged facing each other across the central axis 10 of the solid excitation medium are short-circuited by a bypass circuit. This eliminates the bias of the excitation distribution on the line connecting the failed LD20 and the center of the solid excitation medium as shown in Fig. 8, and the pointing deviation is reduced. Failure Since LD23 located opposite to LD20 is bypassed, the number of LD lighting is n-2, excitation efficiency is
- the energization current becomes small.
- the improvement in excitation efficiency is as follows. Before the LD fails, the excitation efficiency of all cavities is ⁇ . After the LD fails and goes out, the excitation efficiency of the cavity including the failed LD is
- the LD energization current required to maintain the cavity output was 42.42A.
- the LD bypass circuit at the position facing the extinguished LD was operated and extinguished, the LD energization current required to maintain the cavity output was 41.42A.
- the LD conduction current is compared to the normal case.
- the life of the LD is 10,000 hours when the current of the LD is 40A
- the current of the LD will be 40A force 42. Since the output of LD is proportional to (II) from equation (1), the LD lifetime is as follows:
- the LD life is as follows.
- the LD life is compared to the case where the LD at the symmetrical position is turned off. Therefore, compared to the case where the LD at the symmetrical position is turned off, the LD life is compared to the case where the LD at the symmetrical position is turned off.
- the power consumption is compared as follows. Failure If the LD at the symmetrical position of the LD is not extinguished, the number of LDs is 99, the LD ON voltage is 1.8 V, and the LD current power is 2.42 A.
- the number of LDs is 98
- the LD ON voltage is 1.8V
- the LD current is 41.42A.
- Approx. 270W is energy saving. A power reduction effect of about 4% can be obtained.
- a detection circuit that detects a failure in the LD, a bypass circuit that binos current that flows through the LD, and a bypass circuit that is controlled by a signal from the detection circuit to short-circuit a predetermined LD
- the specified LD bypass circuit operates based on the location of the failed LD. By turning it off, the pointing deviation can be improved and the excitation efficiency can be improved.
- the increase in power supply to the LD to obtain the original laser output can be suppressed, and the life of the LD can be extended and the power consumption of the LD can be reduced.
- the LD-pumped solid-state laser oscillator according to the present invention requires a plurality of laser oscillators that need to include a large number of LDs for the pumping light source or a plurality of cavities to obtain a high-power laser. It is particularly suitable for laser oscillators that are important.
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Abstract
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/587,306 US7701990B2 (en) | 2004-12-08 | 2004-12-08 | Laser diode pumped solid-state laser oscillator and laser diode control method of the oscillator |
PCT/JP2004/018291 WO2006061891A1 (ja) | 2004-12-08 | 2004-12-08 | レーザダイオード励起固体レーザ発振器および該発振器におけるレーザダイオード制御方法 |
JP2006546583A JP4274244B2 (ja) | 2004-12-08 | 2004-12-08 | レーザダイオード励起固体レーザ発振器および該発振器におけるレーザダイオード制御方法 |
DE112004002892T DE112004002892B4 (de) | 2004-12-08 | 2004-12-08 | Mit Laserdioden gepumpter Festkörper-Laseroszillator und Verfahren zum Steuern von Laserdioden eines Festkörper-Laseroszillators |
TW094103166A TWI254502B (en) | 2004-12-08 | 2005-02-02 | Laser diode excitation solid laser oscillator and laser diode control method of the same |
Applications Claiming Priority (1)
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PCT/JP2004/018291 WO2006061891A1 (ja) | 2004-12-08 | 2004-12-08 | レーザダイオード励起固体レーザ発振器および該発振器におけるレーザダイオード制御方法 |
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WO2006061891A1 true WO2006061891A1 (ja) | 2006-06-15 |
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US (1) | US7701990B2 (ja) |
JP (1) | JP4274244B2 (ja) |
DE (1) | DE112004002892B4 (ja) |
TW (1) | TWI254502B (ja) |
WO (1) | WO2006061891A1 (ja) |
Cited By (3)
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JP2010272607A (ja) * | 2009-05-20 | 2010-12-02 | Casio Computer Co Ltd | 投影装置 |
JP2020068312A (ja) * | 2018-10-25 | 2020-04-30 | パナソニックIpマネジメント株式会社 | レーザ装置 |
JP2021022593A (ja) * | 2019-07-24 | 2021-02-18 | パナソニックIpマネジメント株式会社 | レーザ加工装置 |
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DE102009005999A1 (de) * | 2009-01-23 | 2010-09-16 | Trumpf Laser Gmbh + Co. Kg | Verfahren zur Bestimmung der Degradation und/oder Effizienz von Lasermodulen und Lasereinheit |
CN102414621B (zh) * | 2009-03-06 | 2014-12-10 | 麦克罗尼克迈达塔有限责任公司 | 扫掠期间剂量可变的转子光学部件成像方法及系统 |
US9590388B2 (en) * | 2011-01-11 | 2017-03-07 | Northrop Grumman Systems Corp. | Microchannel cooler for a single laser diode emitter based system |
US8971366B2 (en) * | 2012-11-02 | 2015-03-03 | Symbol Technologies, Inc. | Killswitch arrangement for and method of regulating laser output power in electro-optical readers |
US20140226688A1 (en) * | 2013-02-11 | 2014-08-14 | Raytheon Company | Multiple output diode driver with independent current control and output current modulation |
WO2015145742A1 (ja) * | 2014-03-28 | 2015-10-01 | 株式会社島津製作所 | レーザダイオードの駆動回路及びレーザ装置 |
US10454244B2 (en) * | 2017-08-09 | 2019-10-22 | Lawrence Livermore National Security, Llc | Driver circuitry and systems for high current laser diode arrays |
CN117099276A (zh) | 2021-03-30 | 2023-11-21 | 昕诺飞控股有限公司 | 激光二极管照明电路 |
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JP2002050813A (ja) * | 2000-08-07 | 2002-02-15 | Toshiba Corp | 固体レーザ装置 |
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JPS59103565A (ja) | 1982-12-03 | 1984-06-15 | Hitachi Ltd | 発光ダイオ−ドの直列接続回路 |
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JP2001353897A (ja) | 2000-06-12 | 2001-12-25 | Ricoh Co Ltd | 画像形成装置 |
KR100453493B1 (ko) | 2000-12-27 | 2004-10-15 | 미쓰비시덴키 가부시키가이샤 | 고체레이저장치 |
JP3859455B2 (ja) * | 2001-03-07 | 2006-12-20 | レーザーフロントテクノロジーズ株式会社 | 半導体レーザ励起固体レーザ装置及び該装置の状態診断方法 |
WO2004062051A1 (de) * | 2002-12-27 | 2004-07-22 | Osram Opto Semiconductors Gmbh | Laserdiodenbarren mit parallel geschalteter diode zur elektrischen überbrückung des laserdiodenbarrens im fehlerfall |
DE10306312A1 (de) | 2002-12-27 | 2004-07-22 | Osram Opto Semiconductors Gmbh | Laserdiodenbauelement und elektronische Schaltungsanordnung mit einer Mehrzahl von seriell zueinander verschalteten Laserdiodenbarren |
JP2004259965A (ja) * | 2003-02-26 | 2004-09-16 | Orc Mfg Co Ltd | 電流駆動素子制御回路及びこの回路を用いた固体レーザ装置 |
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2004
- 2004-12-08 WO PCT/JP2004/018291 patent/WO2006061891A1/ja active Application Filing
- 2004-12-08 DE DE112004002892T patent/DE112004002892B4/de not_active Expired - Fee Related
- 2004-12-08 JP JP2006546583A patent/JP4274244B2/ja active Active
- 2004-12-08 US US10/587,306 patent/US7701990B2/en active Active
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JP2002050813A (ja) * | 2000-08-07 | 2002-02-15 | Toshiba Corp | 固体レーザ装置 |
JP2004014917A (ja) * | 2002-06-10 | 2004-01-15 | Nec Corp | 半導体レーザ励起レーザ装置 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010272607A (ja) * | 2009-05-20 | 2010-12-02 | Casio Computer Co Ltd | 投影装置 |
JP2020068312A (ja) * | 2018-10-25 | 2020-04-30 | パナソニックIpマネジメント株式会社 | レーザ装置 |
JP7199034B2 (ja) | 2018-10-25 | 2023-01-05 | パナソニックIpマネジメント株式会社 | レーザ装置 |
JP2021022593A (ja) * | 2019-07-24 | 2021-02-18 | パナソニックIpマネジメント株式会社 | レーザ加工装置 |
JP7312956B2 (ja) | 2019-07-24 | 2023-07-24 | パナソニックIpマネジメント株式会社 | レーザ加工装置 |
Also Published As
Publication number | Publication date |
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US20070160098A1 (en) | 2007-07-12 |
JP4274244B2 (ja) | 2009-06-03 |
JPWO2006061891A1 (ja) | 2008-06-05 |
US7701990B2 (en) | 2010-04-20 |
TW200620769A (en) | 2006-06-16 |
TWI254502B (en) | 2006-05-01 |
DE112004002892T5 (de) | 2007-10-25 |
DE112004002892B4 (de) | 2010-04-08 |
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