WO2010047180A1 - ファイバ光学装置及びその駆動方法 - Google Patents
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- WO2010047180A1 WO2010047180A1 PCT/JP2009/065203 JP2009065203W WO2010047180A1 WO 2010047180 A1 WO2010047180 A1 WO 2010047180A1 JP 2009065203 W JP2009065203 W JP 2009065203W WO 2010047180 A1 WO2010047180 A1 WO 2010047180A1
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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
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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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
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/1001—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers 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
- H01S3/0014—Monitoring arrangements not otherwise provided for
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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
- H01S3/094076—Pulsed or modulated 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
- H01S3/09—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
- H01S3/09—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
- H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
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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
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1618—Solid materials characterised by an active (lasing) ion rare earth ytterbium
Definitions
- the present invention relates to a fiber optical device using an amplification optical fiber having a core containing a laser active substance, and a driving method thereof.
- an optical device such as a laser device or an optical amplification device
- a fiber optical device using an amplification optical fiber to which a laser active substance such as Yb is added is known.
- pump light for example, light having a wavelength of 975 nm
- seed light for example, light having a wavelength of 975 nm
- the seed light is amplified and output from the optical fiber as output light.
- the optical device is configured as a laser device, a resonator is provided for the amplification optical fiber, and output laser light is generated by causing the amplified light to oscillate in the resonator.
- fiber optical devices such as Yb-doped fiber laser devices are widely used in fields such as industrial continuous operation type (continuous oscillation type) laser light sources.
- an optical fiber deterioration phenomenon called photodarkening which occurs in a wide range from the ultraviolet region to the near infrared region due to the supply of excitation light to the amplification optical fiber, is a problem.
- photodarkening occurs, light transmission loss increases in the amplification optical fiber.
- Non-Patent Document 1 specifically describes a photobleaching phenomenon using the third harmonic of an Nd: YAG laser having a wavelength of 355 nm.
- the characteristics of the photobleaching can be recovered by supplying laser light (for example, laser light having a wavelength of 407 nm) from a small output blue LD to the amplification optical fiber as bleaching light. It has been reported that an effect can be obtained. As described above, the fact that the characteristics can be recovered by the blue LD having an output of about 10 mW with respect to the optical fiber in which the photodarkening has occurred has a great impact on the practical use of the pulse oscillation type fiber laser device. However, a sufficient method for applying the photo bleaching phenomenon to the fiber optical device has not been sufficiently studied so far.
- the present invention has been made to solve the above-described problems, and provides a fiber optic device capable of preferably performing characteristic recovery of an amplification optical fiber by photobleaching, and a driving method thereof. For the purpose.
- a fiber optical device includes (1) an amplification optical fiber having a core containing a laser active substance, and (2) a pulse seed light for the amplification optical fiber.
- the control means generates the first output light between the first output light pulse and the next second output light pulse. It is divided into a plurality of periods having at least a first period in which the inversion distribution in the amplification optical fiber is non-saturated, including immediately after the output of the pulse, and a second period including immediately before the output of the second output optical pulse. In the first period, the bleaching light from the bleaching light source is supplied to the amplification optical fiber, and the excitation light from the pumping light source is supplied in the second period.
- the fiber optical device driving method includes: (a) an amplification optical fiber having a core containing a laser active substance; and (b) a seed light source that supplies pulsed seed light to the amplification optical fiber. (C) an excitation light source for supplying excitation light to the laser active material to the amplification optical fiber; and (d) bleaching for reducing light transmission loss due to photodarkening to the amplification optical fiber. Applied to a fiber optic device including a bleaching light source for supplying light, and (e) supplying a pulse seed light to an optical fiber for amplification that is in an inverted distribution state by supplying pump light.
- a bleaching light source for supplying bleaching light to the optical fiber is provided for the fiber optical device constituted by the amplification optical fiber, the seed light source, and the excitation light source.
- the first output light is divided into a first period and a second period between the continuous first and second output light pulses.
- the bleaching light is supplied to the optical fiber and the characteristics of the optical fiber are recovered.
- the inventor of the present application has studied in detail the recovery of the characteristics of the optical fiber by photobleaching. If the pumping light and the bleaching light are continuously supplied to the amplification optical fiber, the photodarkness is reversed. The knowledge that ning progresses rapidly was acquired. In contrast, as described above, by supplying bleaching light in the first period in which the inversion distribution in the optical fiber is not saturated, the characteristic recovery of the amplification optical fiber by photobleaching is suitably executed. It becomes possible.
- the fiber optic device configured by the amplification optical fiber, the seed light source, and the excitation light source is provided with the bleaching light source that supplies the bleaching light to the optical fiber.
- the interval between successive first and second output light pulses is divided into a first period and a second period, and the inversion distribution in the optical fiber is unsaturated, including immediately after the output of the first output light pulse.
- the characteristic recovery of the optical fiber for amplification by photobleaching is preferably performed by supplying the bleaching light to the optical fiber and thereby recovering the characteristic of the optical fiber. Is possible.
- FIG. 1 is a diagram illustrating a configuration of an embodiment of a fiber optical device.
- FIG. 2 is a timing chart showing a first example of the operation of the fiber laser device.
- FIG. 3 is a timing chart showing the supply timing of pumping light and bleaching light, and the output timing of output light pulses together with the time variation of the inversion distribution density.
- FIG. 4 is a graph showing the change over time of the average output of the fiber laser device.
- FIG. 5 is a timing chart showing a second example of the operation of the fiber laser device.
- FIG. 6 is a timing chart showing the supply timing of pumping light and bleaching light, and the output timing of output light pulses together with the time variation of the inversion distribution density.
- FIG. 7 is a timing chart showing a third example of the operation of the fiber laser device.
- FIG. 1 is a diagram showing a configuration of an embodiment of a fiber optical device according to the present invention.
- the fiber optical device 1A according to the present embodiment includes an amplification optical fiber 10, a seed light source 15, excitation light sources 21 to 25, and a bleaching light source 40, and amplifies the optical fiber 10 for the pulse seed light supplied from the seed light source 15.
- the amplification optical fiber 10 is an optical fiber that includes a core containing a laser active substance and a clad provided on the outer periphery of the core and has an optical amplification function.
- seed light having a wavelength included in a wavelength band having a gain can be optically amplified by supplying excitation light having a wavelength capable of exciting the added laser active substance.
- an optical fiber 10 for example, an optical fiber made of quartz glass to which a rare earth element such as Yb or Er is added as a laser active material can be used.
- an optical fiber having a double clad structure in which an inner clad and an outer clad are provided on the outer periphery of the core can be used.
- the seed light source 15 is a pulse light source that supplies pulse seed light that is to be amplified to the amplification optical fiber 10.
- the seed light source 15 is preferably a pulse laser light source capable of supplying pulsed light having a predetermined wavelength and pulse width.
- the pulse seed light emitted from the seed light source 15 enters the optical fiber 16 through a condensing optical system such as a condensing lens, and is guided to the polarization-independent optical isolator 17 by the optical fiber 16. Is done.
- the pulse seed light is guided to the optical combiner 18 via the optical isolator 17 and the optical fiber 30.
- the optical fibers 16 and 30 for example, single mode fibers (SMF) can be used, respectively.
- SMF single mode fibers
- the amplification optical fiber 10 is provided with one or a plurality of excitation light sources for supplying excitation light to the laser active material included in the core of the optical fiber 10.
- excitation light sources 21 to 25 are installed.
- laser diodes (LD) are preferably used.
- excitation light having a predetermined wavelength emitted from the excitation light sources 21 to 25 is guided to the optical combiner 18 through the optical fibers 31 to 35, respectively.
- the optical fibers 31 to 35 for example, multimode fibers (MMF) can be used.
- a bleaching light source 40 is further provided.
- the light source 40 is a bleaching light source for supplying bleaching light for reducing light transmission loss due to characteristic deterioration in photodarkening to the amplification optical fiber 10.
- a laser diode (LD) such as a blue laser diode is preferably used.
- the bleaching light is preferably light having a wavelength in the range of 355 nm to 532 nm.
- bleaching light having a predetermined wavelength emitted from the light source 40 is guided to the optical combiner 18 by the optical fiber 45.
- the optical fiber 45 for example, a multimode fiber (MMF) can be used as in the case of the optical fibers 31 to 35.
- MMF multimode fiber
- the input side of the optical combiner 18 is connected to one optical fiber 30 preferably made of SMF, and preferably six optical fibers 31 to 35, 45 made of MMF, for a total of seven optical fibers.
- the input end of the amplification optical fiber 10 having a core containing a laser active substance is connected to the output side of the optical combiner 18.
- the pulse seed light from the seed light source 15, the excitation light from the excitation light sources 21 to 25, and the bleaching light from the bleaching light source 40 respectively correspond to the corresponding optical fibers 30, 31 to 35 and 45, and the optical combiner. 18 is supplied to the amplification optical fiber 10 via 18.
- the pulse seed light from the seed light source 15 is supplied to the amplification optical fiber 10 that is in an inversion distribution state by the supply of the excitation light from the excitation light sources 21 to 25.
- the pulse seed light is optically amplified in the optical fiber 10, and an output optical pulse that is amplified light is generated and output from the output end of the optical fiber 10 (output step).
- the fiber optical device 1A shown in FIG. 1 is configured as a fiber laser device, a resonator is provided for the amplification optical fiber 10, and the amplified light pulse is laser-oscillated in the resonator. A laser light pulse that is an output light pulse is generated.
- the resonator in this case can be configured using, for example, an end face of the optical fiber 10 or a fiber grating formed in the optical fiber 10. Further, when the fiber optical device 1A is configured as a fiber light amplifying device, a resonator structure is not necessary.
- a control device 50 for controlling the operations of the amplification optical fiber 10, the seed light source 15, the excitation light sources 21 to 25, and the bleaching light source 40 is provided.
- This control device 50 supplies the pulse seed light from the seed light source 15 to the amplification optical fiber 10, the pump light from the pump light sources 21 to 25, and the bleaching light from the bleaching light source 40.
- Control means for controlling timing are provided.
- the control device 50 includes a seed light source drive unit 51, an excitation light source drive unit 52, a bleaching light source drive unit 53, and a timing control unit 55.
- the light source driving units 51 to 53 are configured by, for example, a light source driving circuit, and drive-control the corresponding seed light source 15, excitation light sources 21 to 25, and bleaching light source 40, respectively.
- the timing control unit 55 is configured by, for example, a timing control circuit, and controls the light supply timing from each light source by instructing the drive timing to each of the light source driving units 51 to 53. Note that the pulse seed light supply timing from the seed light source 15 corresponds to the output timing of the output light pulse from the amplification optical fiber 10.
- the control device 50 includes a first output light pulse, a second output light pulse next to the first output light pulse, and a pulse train of output light pulses output in time series from the amplification optical fiber 10.
- a first period in which the inversion distribution in the amplification optical fiber 10 is in a non-saturated state including immediately after the output of the first output light pulse, and a second period including immediately before the output of the second output light pulse. are divided into a plurality of periods.
- the bleaching light from the bleaching light source 40 is supplied (bleaching step) to the amplification optical fiber 10 to recover the characteristics of the optical fiber 10, and in the second period, the excitation light is pumped.
- Excitation light from the light sources 21 to 25 is supplied (excitation step) to excite the laser active substance in the optical fiber 10.
- the optical fiber 10 is bleached with respect to the fiber optical device 1A constituted by the amplification optical fiber 10, the seed light source 15, and the pumping light sources 21 to 25.
- a bleaching light source 40 for supplying light is provided. Thereby, it is possible to reduce the light transmission loss generated in the amplification optical fiber 10 by photodarkening by using the photo bleaching phenomenon, and to recover the characteristics of the optical fiber 10.
- the first period between the first and second output light pulses with respect to the pulse train of the output light pulses from the optical fiber 10, and the second time Divided into periods are not saturated, and Recovery of the characteristics of the optical fiber 10 is performed.
- the inventor of the present application conducted an experiment to suppress the progress of photodarkening by simultaneously supplying bleaching light while operating a pulse oscillation type laser device to recover characteristics of an optical fiber by photobleaching in a fiber laser device.
- the photodarkening progressed more rapidly than the case where only the pumping light was supplied to the amplification optical fiber, and the amplification optical fiber was broken. This is considered to be because bleaching light was supplied to the amplification optical fiber whose inversion distribution density is high due to the supply of excitation light.
- the continuous oscillation type fiber laser device since the inversion distribution density is kept low, the optical fiber characteristic deterioration due to photodarkening does not occur in the first place.
- the progress of photodarkening is proportional to the square of the inversion distribution.
- the inversion distribution in the amplification optical fiber 10 is unsaturated and the inversion distribution density is sufficiently low. Is set to the first period, and in this first period, the bleaching light from the light source 40 is supplied to the optical fiber 10. Thereby, it is possible to suitably execute the characteristic recovery of the amplification optical fiber 10 by photobleaching and the reduction of the light transmission loss thereby.
- the setting of the bleaching light supply period for the amplification optical fiber 10 will be specifically described later.
- the wavelength of the bleaching light supplied from the bleaching light source 40 to the amplification optical fiber 10 is preferably light having a wavelength in the range of 355 nm to 532 nm, for example.
- the wavelength of the bleaching light supplied from the bleaching light source 40 to the amplification optical fiber 10 is preferably light having a wavelength in the range of 355 nm to 532 nm, for example.
- the wavelength range of the bleaching light described above indicates a wavelength range in consideration of a wavelength range of a light source that can be suitably introduced into an optical fiber in practice.
- the wavelength 355 nm indicates the wavelength of the third harmonic of the YAG laser.
- a wavelength of 532 nm indicates the wavelength of the second harmonic of the YAG laser.
- light in a particularly important wavelength range within the above wavelength range can also be supplied by a laser diode (LD). Examples of such bleaching light include light having a wavelength of 407 nm supplied from a blue LD.
- the laser active substance contained in the core of the amplification optical fiber 10 is preferably Yb (ytterbium).
- the optical fiber 10 for amplification can be comprised suitably.
- the pumping light is supplied to the amplifying optical fiber 10 so that the pumping light from the pumping light sources 21 to 25 is supplied to the amplifying optical fiber 10 in all periods including the first period and the second period. Also good.
- the first period in which the bleaching light is supplied is a period in which the inversion distribution is in an unsaturated state as described above in consideration of the temporal change in the inversion distribution density in the amplification optical fiber 10 due to the supply of the pumping light. Need to be set as.
- the excitation light may be supplied without supplying the excitation light in the first period. In this case, the non-saturated state of the inversion distribution in the amplification optical fiber is reliably maintained in the first period.
- the first pulse group includes a plurality of output light pulses in which a pulse train of output light pulses output from the amplification optical fiber 10 has the first output light pulse as the last output light pulse.
- a second pulse group including a plurality of output light pulses having the second output light pulse as the first output light pulse, and the time interval between the first output light pulse and the second output light pulse is the first pulse. You may use the structure set wider than the time interval of the output light pulse in a group and the 2nd pulse group.
- the bleaching light is not supplied between the output light pulses, and between the first output light pulse and the second output light pulse. It is preferable that bleaching light from the light source 40 is supplied to the amplification optical fiber 10 in the first period set between the first pulse group and the second pulse group.
- Such a configuration is effective, for example, in an industrial fiber laser device, in which the recovery of the characteristics of the optical fiber is performed by supplying bleaching light during the idle period of the laser device.
- a Yb-doped optical fiber manufactured by Nufern was used as the amplification optical fiber 10.
- the optical fiber 10 is a double clad type, and has a core diameter of about 10 ⁇ m and an inner clad diameter of about 130 ⁇ m.
- the length of the Yb-doped optical fiber 10 is about 8 m, and an end cap with an oblique polishing (about 8 degrees) finish is fused to the output end of the Yb-doped optical fiber 10 so that parasitic oscillation hardly occurs.
- the pulse seed light source 15 As the pulse seed light source 15, a laser oscillator manufactured by Hamamatsu Photonics Co., Ltd. using an LD-excited Q switch system using Nd: YAG as a laser medium was used.
- the laser wavelength of the oscillator is about 1064 nm, and the line width is about 2 nm.
- the pulse repetition frequency is variable from 1 Hz to 50 kHz.
- the pulse width of the pulse seed light supplied from the seed light source 15 depends on the excitation intensity and the repetition frequency. In an embodiment to be described later, as an example, the pulse width is set to about 250 ns (full width at half maximum). Further, the pulse energy also depends on the excitation intensity and the repetition frequency as well as the pulse width. In the embodiment, as an example, the pulse energy is set to about 230 nJ. Further, as the optical fiber 16 for guiding the pulse seed light, a single mode fiber HI1060 manufactured by Corning was used as the optical fiber 16 for guiding the pulse seed light. The pulse energy of the pulse seed light at the output end of the optical fiber 16 was about 110 nJ / pulse.
- the excitation light sources 21 to 25 fiber coupled LDs manufactured by Hamamatsu Photonics were used.
- the output wavelength of this LD is about 915 nm, and the maximum output is about 5 W.
- the number of pumping light sources for the amplification optical fiber 10 may be arbitrarily set according to the specific configuration of the fiber optical device 1A, but here it is set to five as described above.
- the bleaching light source 40 As the bleaching light source 40, a blue LD manufactured by Nichia Corporation was used. The output wavelength of this LD is 407 nm. Further, the blue LD and the optical fiber 45 were coupled using a condensing lens. The output of bleaching light at the output end of the optical fiber 45 was about 80 mW at the maximum.
- the pulse seed light, the excitation light, and the bleaching light are configured such that their output and timing can be freely controlled.
- an ITF combiner As the optical combiner 18, an ITF combiner was used. This combiner has six multimode fibers (MMF, core diameter of about 105 ⁇ m, clad diameter of about 125 ⁇ m) for introducing pump light and one single mode for introducing signal light (seed light) on the input side. These six MMFs and one SMF are provided with one double clad SMF on the output side (core diameter of about 6 ⁇ m, inner clad diameter of about 125 ⁇ m, outer clad diameter of about 300 ⁇ m). Further, the above-described amplification optical fiber 10 is further connected to the double-clad SMF on the output side.
- MMF multimode fibers
- the optical fibers 31 to 35 and 45 connected to the excitation light sources 21 to 25 and the bleaching light source 40 are used as the optical fibers 31 to 35 and 45 connected to the excitation light sources 21 to 25 and the bleaching light source 40. Further, as the optical fiber 30 connected to the seed light source 15 via the optical isolator 17, one SMF on the input side of the combiner was used.
- the fiber optical device according to the present invention and the driving method thereof will be further described along with specific examples of operation.
- a case where the fiber optical device is configured as a laser device will be described as an example, but the basic operation is the same even when the fiber optical device is configured as an optical amplification device.
- FIG. 2 is a timing chart showing a first example of the operation of the fiber laser device shown in FIG.
- the supply timing of pumping light and bleaching light to the amplification optical fiber 10 and the output timing of the output light pulse from the amplification optical fiber 10 are shown.
- the horizontal axis represents time (100 ⁇ s / div).
- the repetition frequency of the output laser light pulse is set to 2.5 kHz
- the pulse energy is set to 2 mJ
- the pulse width (FWHM) is set to 250 ns
- the bleaching light supply pulse width is set to 100 ⁇ s
- the excitation light supply pulse width is set to 300 ⁇ s. is doing.
- FIG. 3 is a timing chart showing the pump light and bleaching light supply timing and the output light pulse output timing together with the time variation of the inversion distribution density in the amplification optical fiber 10 for the operation example shown in FIG. It is a chart.
- FIG. 3 is for explaining the relationship between each operation period and the time variation of the inversion distribution density.
- the timing chart of FIG. 2 shows the pulse widths of the excitation light and the bleaching light. The conditions are different.
- the period between the first output light pulse P1 and the next second output light pulse P2 includes the time immediately after the output of the output light pulse P1 and the amplification optical fiber 10.
- the bleaching light is supplied to the amplification optical fiber 10 in the first period T1 in which the inversion distribution is in a non-saturated state.
- the pumping light is supplied to the amplification optical fiber 10, and the pulse seed light is supplied to the optical fiber 10 at the timing when the supply of the pumping light is finished, so that an output light pulse is generated.
- the supply timing of each light is set.
- FIG. 4 is a graph showing the time change of the average output of the fiber laser device, where the horizontal axis indicates the operating time (h) and the vertical axis indicates the average output (W).
- a graph A0 shows a time change of the output when the bleaching light is not supplied to the amplification optical fiber 10
- a graph A1 shows the first operation example shown in FIG. The time change of the output in is shown.
- the graph A2 shows the time change of the output in the second operation example described later
- the graph A3 shows the time change of the output in the third operation example.
- the graph A0 shows the time change of the output when the bleaching light is not supplied in the third operation example.
- the laser output gradually decreases with time, and after 500 hours, it decreases to about 20% of the initial value. is doing.
- the Yb-doped optical fiber used as the optical fiber 10 was taken out and its optical transmission loss was measured. As a result, an increase in loss was observed in a wide range from the visible range to the near infrared range. This is a typical photodarkening phenomenon.
- FIG. 3 shows that the characteristics of the amplification optical fiber 10 are restored by supplying bleaching light.
- the repetition frequency is set low, the average output value is relatively low.
- FIG. 5 is a timing chart showing a second example of the operation of the fiber laser device shown in FIG.
- the horizontal axis represents time (10 ⁇ s / div).
- the repetition frequency of the output laser light pulse is set to 50 kHz
- the pulse energy is set to 200 ⁇ J
- the pulse width (FWHM) is set to 250 ns
- the supply pulse width of the bleaching light is set to 1000 ns (1 ⁇ s)
- the supply of excitation light is set to continuous supply. is doing.
- FIG. 6 is a timing chart showing the pump light and bleaching light supply timing and the output light pulse output timing together with the time variation of the inversion distribution density in the amplification optical fiber 10 for the operation example shown in FIG. It is a chart.
- the period between the first output light pulse P1 and the next second output light pulse P2 includes the time immediately after the output of the output light pulse P1 and the amplification optical fiber 10.
- the bleaching light is supplied to the amplification optical fiber 10 in the first period T1 in which the inversion distribution is in a non-saturated state.
- the excitation light is continuously supplied to the amplification optical fiber 10 in the entire period including the first period T1 and the second period T2.
- a graph A2 shows a time change of the output in the second operation example shown in FIG.
- the bleaching light supply is performed according to the operation example of FIG. 5, as in the operation example of FIG. 2, no decrease in output was observed in the operation time of 500 hours.
- the inversion distribution density that is increasing due to the supply of pumping light remains at a sufficiently low value immediately after the output light pulse takes out the inversion distribution in the amplification optical fiber 10 as energy (see FIG. 3). 6)
- the characteristics of the amplification optical fiber 10 are recovered despite the fact that the excitation light is continuously supplied to the amplification optical fiber 10 by supplying the bleaching light. It is shown.
- FIG. 7 is a timing chart showing a third example of the operation of the fiber laser device shown in FIG.
- the horizontal axis represents time (1 s / div).
- the repetition frequency of the output laser light pulse is set to 50 kHz
- the pulse energy is set to 200 ⁇ J
- the pulse width (FWHM) is set to 250 ns.
- a pulse train composed of output optical pulses output from the amplification optical fiber 10 within an operation period of 4 seconds is defined as a pulse group.
- a pulse group including a plurality of output light pulses having the first output light pulse as the last output light pulse is referred to as a first pulse group G1, and the next pulse group including the second output light pulse.
- a pulse group including a plurality of output light pulses having a pulse as the first output light pulse is defined as a second pulse group G2.
- the time interval between the first output light pulse and the second output light pulse (1 s, coincident with the pause period) is the time interval between the output light pulses in the first pulse group G1 and the second pulse group G2 ( 20 ⁇ s).
- the first output light is not supplied between the output light pulses in the first pulse group G1 and the second pulse group G2, and the first output light is not supplied.
- a first period T1 set between the pulse and the second output light pulse (between the first and second pulse groups), bleaching light is supplied to the amplification optical fiber 10.
- the first period T1 includes about 1 second including almost immediately after the first output light pulse, which is the last output light pulse of the first pulse group G1, and almost all the rest period of the laser light source. Yes. Further, a predetermined period immediately before the output of the second output light pulse, which is the first output light pulse of the second pulse group G2, and an operation period of the laser light source in which each output light pulse of the second pulse group G2 is output. Four seconds is set as the second period T2.
- the bleaching light is supplied to the amplification optical fiber 10 in the first period T1 in which the inversion distribution is in a non-saturated state. Further, in the second period T2, excitation light is continuously supplied to the amplification optical fiber 10.
- a graph A3 shows a change in output over time in the third operation example shown in FIG. As shown in the graph A3, when the bleaching light supply is performed according to the operation example of FIG. 7, the output decrease is completely not observed in the operation time of 500 hours as in the operation example of FIG. 2 and the operation example of FIG. It was not seen. This indicates that the characteristics of the amplifying optical fiber 10 are recovered by supplying bleaching light in the first period T1 set within the suspension period of the laser device.
- the output of the excitation light is about 15 W, and the output of the bleaching light is about 50 mW.
- the laser output shown in the graph A3 of FIG. 4 is obtained by sampling the output only during the operation of the fiber laser device. Further, as described above, the graph A0 in FIG. 4 shows the time change of the output when the bleaching light is not supplied under the operation condition in the third operation example.
- the fiber laser device when used as an industrial laser device, it is often required to operate the laser device for 24 hours for the purpose of improving productivity. However, even in such a case, time for replacement or positioning of an object to be laser processed is necessary, and such time becomes a rest period of the laser device.
- the operation example shown in FIG. 7 is effective in the case where the characteristic recovery of the amplification optical fiber 10 is performed by supplying bleaching light during such a pause period of the laser apparatus.
- the fiber optical device and the driving method thereof according to the present invention are not limited to the above-described embodiments and configuration examples, and various modifications are possible.
- the configuration shown in FIG. 1 is an example, and various other configurations may be used.
- the supply of pumping light and bleaching light to the amplification optical fiber is configured to be supplied from the input end side to the optical fiber as in the case of the pulse seed light in the configuration of FIG.
- the pumping light and the bleaching light may be supplied from the side or both sides of the input end and the output end.
- the first period of supplying bleaching light to the amplification optical fiber depends on the specific configuration and operating conditions of the fiber optical device.
- the bleaching light supply period can be appropriately set so as to satisfy the condition that the inversion distribution in the amplification optical fiber is not saturated, including immediately after the output of the first output light pulse. It is.
- an amplification optical fiber having a core containing a laser active substance and (2) a seed light source that supplies pulse seed light to the amplification optical fiber, (3) an excitation light source for supplying excitation light to the laser active material to the amplification optical fiber; and (4) bleaching light for reducing light transmission loss due to photodarkening to the amplification optical fiber.
- mutual timing of the supply of pulse seed light from the seed light source to the amplification optical fiber, the supply of excitation light from the excitation light source, and the supply of bleaching light from the bleaching light source (6) The pulse seed light is increased by supplying the pulse seed light to the amplification optical fiber that is in the inverted distribution state by the supply of the pump light.
- the control means immediately after the output of the first output light pulse between the first output light pulse and the next second output light pulse.
- the amplification optical fiber is divided into a plurality of periods having at least a first period in which the inversion distribution in the amplification optical fiber is unsaturated and a second period including immediately before the output of the second output light pulse.
- a configuration is used in which bleaching light from the bleaching light source is supplied in the first period and excitation light from the excitation light source is supplied in the second period.
- an amplification optical fiber having a core containing a laser active substance, and (b) a seed light source for supplying pulse seed light to the amplification optical fiber. And (c) an excitation light source that supplies excitation light to the laser active material to the amplification optical fiber, and (d) a bleach for reducing light transmission loss due to photodarkening to the amplification optical fiber.
- a pumping step of supplying pumping light from a pumping light source to the amplification optical fiber is used.
- the bleaching light supplied from the bleaching light source is light having a wavelength in the range of 355 nm to 532 nm. preferable. By using light of such a wavelength as bleaching light, it is possible to suitably realize the characteristic recovery of the optical fiber.
- the laser active substance contained in the core of the amplification optical fiber is preferably Yb (ytterbium).
- the amplification optical fiber can be suitably configured.
- the excitation light from the excitation light source may be supplied to the amplification optical fiber in the entire period including the first period and the second period.
- the excitation light may be supplied without supplying the excitation light in the first period.
- the pulse train of the output optical pulses output from the amplification optical fiber includes a first pulse group including a plurality of output optical pulses having the first output optical pulse as the last output optical pulse, and the second output optical pulse first. And a second pulse group including a plurality of output light pulses, and the time interval between the first output light pulse and the second output light pulse is within the first pulse group and the second pulse group.
- the output light pulse is set to be wider than the time interval of the output light pulses. In the first pulse group and the second pulse group, the bleaching light is not supplied between the output light pulses, and the first output light is not supplied.
- the bleaching light from the bleaching light source may be supplied to the amplification optical fiber.
- Such a configuration is effective, for example, in an industrial fiber laser device, in which the recovery of the characteristics of the optical fiber is performed by supplying bleaching light during the idle period of the laser device.
- the present invention can be used as a fiber optic device capable of suitably executing characteristic recovery of an amplification optical fiber by photobleaching and a driving method thereof.
- SYMBOLS 1A Fiber optical apparatus, 10 ... Optical fiber for amplification, 15 ... Pulse seed light source, 16 ... Optical fiber, 17 ... Optical isolator, 18 ... Optical combiner, 21-25 ... Excitation light source, 30 ... Optical fiber, 31-35 ... Optical fiber, 40 ... bleaching light source, 45 ... optical fiber, 50 ... control device, 51 ... seed light source driving unit, 52 ... excitation light source driving unit, 53 ... bleaching light source driving unit, 55 ... timing control unit.
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Abstract
Description
Claims (10)
- レーザ活性物質を含有するコアを有する増幅用光ファイバと、
前記増幅用光ファイバに対してパルス種光を供給する種光源と、
前記増幅用光ファイバに対して前記レーザ活性物質への励起光を供給する励起光源と、
前記増幅用光ファイバに対して、フォトダークニングによる光透過損失を低減するためのブリーチング光を供給するブリーチング光源と、
前記種光源から前記増幅用光ファイバへの前記パルス種光の供給、前記励起光源からの前記励起光の供給、及び前記ブリーチング光源からの前記ブリーチング光の供給の相互のタイミングを制御する制御手段とを備え、
前記励起光の供給によって反転分布状態となっている前記増幅用光ファイバに対して、前記パルス種光を供給することで、前記パルス種光が増幅された出力光パルスを生成して出力するとともに、
前記制御手段は、
第1出力光パルスと、その次の第2出力光パルスとの間を、前記第1出力光パルスの出力直後を含み前記増幅用光ファイバでの反転分布が非飽和状態となっている第1期間と、前記第2出力光パルスの出力直前を含む第2期間とを有する複数の期間に区分し、
前記増幅用光ファイバに対して、前記第1期間において、前記ブリーチング光源からの前記ブリーチング光を供給するとともに、前記第2期間において、前記励起光源からの前記励起光を供給することを特徴とするファイバ光学装置。 - 前記ブリーチング光源から供給される前記ブリーチング光は、355nm~532nmの範囲内の波長を有する光であることを特徴とする請求項1記載のファイバ光学装置。
- 前記増幅用光ファイバのコアに含有される前記レーザ活性物質は、Ybであることを特徴とする請求項1または2記載のファイバ光学装置。
- 前記第1期間及び前記第2期間を含む全期間において、前記増幅用光ファイバに対して前記励起光源からの前記励起光を供給することを特徴とする請求項1~3のいずれか一項記載のファイバ光学装置。
- 前記増幅用光ファイバから出力される前記出力光パルスによるパルス列は、前記第1出力光パルスを最後の出力光パルスとする複数の出力光パルスを含む第1パルス群と、前記第2出力光パルスを最初の出力光パルスとする複数の出力光パルスを含む第2パルス群とを含み、
前記第1出力光パルスと前記第2出力光パルスとの時間間隔が、前記第1パルス群内及び前記第2パルス群内での出力光パルスの時間間隔よりも広く設定されており、
前記第1パルス群内及び前記第2パルス群内においては、各出力光パルスの間での前記ブリーチング光の供給を行わず、前記第1出力光パルスと前記第2出力光パルスとの間に設定された前記第1期間において、前記増幅用光ファイバに対して前記ブリーチング光源からの前記ブリーチング光を供給することを特徴とする請求項1~4のいずれか一項記載のファイバ光学装置。 - レーザ活性物質を含有するコアを有する増幅用光ファイバと、
前記増幅用光ファイバに対してパルス種光を供給する種光源と、
前記増幅用光ファイバに対して前記レーザ活性物質への励起光を供給する励起光源と、
前記増幅用光ファイバに対して、フォトダークニングによる光透過損失を低減するためのブリーチング光を供給するブリーチング光源とを備えるファイバ光学装置に適用され、
前記励起光の供給によって反転分布状態となっている前記増幅用光ファイバに対して、前記パルス種光を供給することで、前記パルス種光が増幅された出力光パルスを生成して出力する出力ステップと、
第1出力光パルスの出力直後を含み前記増幅用光ファイバでの反転分布が非飽和状態となっている第1期間において、前記増幅用光ファイバに対して前記ブリーチング光源からの前記ブリーチング光を供給するブリーチングステップと、
前記第1出力光パルスの次の第2出力光パルスの出力直前を含む第2期間において、前記増幅用光ファイバに対して前記励起光源からの前記励起光を供給する励起ステップと
を含むことを特徴とするファイバ光学装置の駆動方法。 - 前記ブリーチング光源から供給される前記ブリーチング光は、355nm~532nmの範囲内の波長を有する光であることを特徴とする請求項6記載のファイバ光学装置の駆動方法。
- 前記増幅用光ファイバのコアに含有される前記レーザ活性物質は、Ybであることを特徴とする請求項6または7記載のファイバ光学装置の駆動方法。
- 前記第1期間及び前記第2期間を含む全期間において、前記増幅用光ファイバに対して前記励起光源からの前記励起光を供給することを特徴とする請求項6~8のいずれか一項記載のファイバ光学装置の駆動方法。
- 前記増幅用光ファイバから出力される前記出力光パルスによるパルス列は、前記第1出力光パルスを最後の出力光パルスとする複数の出力光パルスを含む第1パルス群と、前記第2出力光パルスを最初の出力光パルスとする複数の出力光パルスを含む第2パルス群とを含み、
前記第1出力光パルスと前記第2出力光パルスとの時間間隔が、前記第1パルス群内及び前記第2パルス群内での出力光パルスの時間間隔よりも広く設定されており、
前記第1パルス群内及び前記第2パルス群内においては、各出力光パルスの間での前記ブリーチング光の供給を行わず、前記第1出力光パルスと前記第2出力光パルスとの間に設定された前記第1期間において、前記増幅用光ファイバに対して前記ブリーチング光源からの前記ブリーチング光を供給することを特徴とする請求項6~9のいずれか一項記載のファイバ光学装置の駆動方法。
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EP2522056A2 (en) * | 2010-01-05 | 2012-11-14 | KLA-Tencor Corporation | Alleviation of laser-induced damage in optical materials by suppression of transient color centers formation and control of phonon population |
JP2013197332A (ja) * | 2012-03-21 | 2013-09-30 | Fujikura Ltd | 光回路装置 |
CN107508122A (zh) * | 2017-09-05 | 2017-12-22 | 深圳市杰普特光电股份有限公司 | 一种mopa激光器的控制方法及装置 |
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JP5678759B2 (ja) * | 2011-03-25 | 2015-03-04 | 株式会社豊田中央研究所 | 距離測定装置 |
KR101447043B1 (ko) * | 2011-08-18 | 2014-10-08 | 김상준 | 고체 레이저 장치 및 그의 구동방법 |
JP2013098457A (ja) * | 2011-11-04 | 2013-05-20 | Toshiba Corp | レーザ装置 |
CN104993369B (zh) * | 2015-06-24 | 2018-03-09 | 华中科技大学 | 一种基于光纤激光器暗化维护的暗化漂白装置和方法 |
CN110247292B (zh) * | 2019-07-04 | 2021-04-13 | 华中科技大学鄂州工业技术研究院 | 一种抑制光子暗化和光子暗化漂白的装置、方法 |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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EP2522056A2 (en) * | 2010-01-05 | 2012-11-14 | KLA-Tencor Corporation | Alleviation of laser-induced damage in optical materials by suppression of transient color centers formation and control of phonon population |
EP2522056A4 (en) * | 2010-01-05 | 2013-09-25 | Kla Tencor Corp | MITIGATION OF LASER-INJURED LESIONS IN OPTICAL MATERIALS BY SUPPRESSION OF THE TRANSIENT TRAINING OF COLORED CENTERS AND REGULATION OF POPULATION IN PHONES |
US8711896B2 (en) | 2010-01-05 | 2014-04-29 | Kla-Tencor Corporation | Alleviation of laser-induced damage in optical materials by suppression of transient color centers formation and control of phonon population |
US9059560B2 (en) | 2010-01-05 | 2015-06-16 | Kla-Tencor Corporation | Alleviation of laser-induced damage in optical materials by suppression of transient color centers formation and control of phonon population |
US9461435B2 (en) | 2010-01-05 | 2016-10-04 | Kla-Tencor Corporation | Alleviation of laser-induced damage in optical materials by suppression of transient color centers formation and control of phonon population |
JP2013197332A (ja) * | 2012-03-21 | 2013-09-30 | Fujikura Ltd | 光回路装置 |
CN107508122A (zh) * | 2017-09-05 | 2017-12-22 | 深圳市杰普特光电股份有限公司 | 一种mopa激光器的控制方法及装置 |
CN107508122B (zh) * | 2017-09-05 | 2019-08-27 | 深圳市杰普特光电股份有限公司 | 一种mopa激光器的控制方法及装置 |
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