WO2002095885A1 - Laser a fibre optique - Google Patents

Laser a fibre optique Download PDF

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Publication number
WO2002095885A1
WO2002095885A1 PCT/JP2001/004282 JP0104282W WO02095885A1 WO 2002095885 A1 WO2002095885 A1 WO 2002095885A1 JP 0104282 W JP0104282 W JP 0104282W WO 02095885 A1 WO02095885 A1 WO 02095885A1
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WIPO (PCT)
Prior art keywords
fiber
wavelength
optical fiber
light
laser
Prior art date
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PCT/JP2001/004282
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English (en)
Japanese (ja)
Inventor
Yasuharu Koyata
Yoshihito Hirano
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
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Publication date
Application filed by Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to JP2002592239A priority Critical patent/JP3905479B2/ja
Priority to PCT/JP2001/004282 priority patent/WO2002095885A1/fr
Publication of WO2002095885A1 publication Critical patent/WO2002095885A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/35—Non-linear optics
    • G02F1/365—Non-linear optics in an optical waveguide structure
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/02—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 fibre
    • 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
    • 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
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
    • H01S3/109—Frequency multiplication, e.g. harmonic generation

Definitions

  • the present invention relates to a fiber laser device utilizing both the stimulated emission effect and the non-linear effect, and more particularly to a fiber laser device capable of increasing the efficiency of wavelength conversion in non-linear effects (stimulated Raman scattering, stimulated Brillouin scattering). It is. Background art
  • fiber laser devices that input pump light of an arbitrary wavelength and output laser light of a different wavelength from the pump light include rare-earth doped fiber lasers using the stimulated emission effect and Raman lasers that use the nonlinear effect.
  • the rare earth-doped fiber laser includes a rare earth doped fiber and a pair of reflecting means arranged with the rare earth doped fiber interposed therebetween.
  • a mirror or fiber grating that reflects light oscillating in the rare-earth-doped fiber is used as the reflection means, and is arranged with the rare-earth-doped fiber interposed therebetween to form a so-called Fabry 1.Perot resonator. .
  • rare-earth doped fibers rare-earth elements such as Nd, Ho, Er, Tm, and Yb are doped into the core that forms the center of optical fibers such as quartz, fluoride, and phosphoric acid. It is configured.
  • the excitation light is input to the rare earth doped fiber via a reflection means or a fiber power plug of WDM (wavelength division multiplexing).
  • WDM wavelength division multiplexing
  • the wavelength of light emitted by the stimulated emission effect is dropped into the optical fiber. Is determined by the inherent transition energy of the rare earth element.
  • rare earth elements For example, rare earth elements
  • a fiber grating is formed by forming a diffraction grating (grating) having an arbitrary reflectance with respect to light in an optical fiber. Therefore, the use of a fiber grating as a reflection means forms a fiber grating in the rare-earth doped fiber itself, so that a resonator can be simply composed of an optical fiber alone, and an oscillating laser The advantage is that the loss in light is small.
  • a core doped with a rare-earth element, a first cladding provided to cover the core, and a coating of the first cladding are provided.
  • the region surrounded by the second clad while the excitation light incident on the first clad is repeatedly reflected at the interface between the first and second clads.
  • the first cladding increases the light receiving area of the excitation light. Therefore, it is possible to apply an array LD with a large light emission area and high power characteristics as an excitation light source compared to a single active layer LD (Laser diode). As a result, a high-power pumping light excites the core, thereby realizing a multiport class high output as a rare-earth-doped fiber laser.
  • the Raman fiber laser includes a silica-based optical fiber and a pair of reflecting means disposed with the optical fiber interposed therebetween.
  • a pair of reflecting means sandwiches the optical fiber to form a flat Perot resonator.
  • the wavelength difference obtained by stimulated Raman scattering is called a Raman shift amount.
  • the maximum broadband gain is obtained at a Raman shift of 13.2THZ.
  • this Raman fiber laser has a feature that a laser beam having a desired wavelength shifted by the Raman shift amount can be oscillated by selecting the wavelength of the excitation light. For example, in the case of a silica-based optical fiber, laser beams having wavelengths of 1.12 ⁇ m and 1.66 zm are obtained by excitation light having wavelengths of 1.06 zm and 1.55 ⁇ , respectively.
  • the gain in stimulated Raman scattering increases, and the core is doped with P or B as an active substance. Then, the gain increases as the amount of Raman shift changes.
  • m (where m is an integer of 2 or more) stimulated Raman scattering can be generated in a cascade, and the desired Raman shift shifted by m times is desired.
  • a laser that can obtain a laser beam having a wavelength of is proposed in, for example, US Pat. No. 5,323,404.
  • FIG. 10 is a configuration diagram schematically showing a conventional Cascade-Dramman fiber laser described in, for example, US Pat. No. 5,323,404.
  • this conventional Cascade-Draman fiber laser 900 is composed of a silica-based optical fiber 920 and four pairs of fiber optic gratings formed on the silica-based optical fiber 920.
  • the fiber gratings 921 and 922 reflect light having a center wavelength of 1117 nm
  • the fiber gratings 931 and 932 reflect light having a center wavelength of 1175 nm and a fiber grating.
  • the fiber grating 913 is configured to reflect light having a central wavelength of 1064 nm. Note that the fiber gratings 9 13, 9 21, 9 22, 9 31, 9 32, 9 41, 9 42, and 9 51 have high reflectance (9 The fiber grating 952 has a low reflectance (for example, 15%) for light of the target wavelength.
  • the wavelengths 1117 nm, 1175, 1240 nm, and 1315 are the wavelengths of light generated in cascade by stimulated Raman scattering.
  • a laser beam having a wavelength of 1064 is input to an optical fiber 920 as excitation light, and the wavelength corresponding to the amount of Raman shift is obtained by the excitation light of the wavelength 1064 plate.
  • the laser beam of the 1117 plate is oscillated by reciprocating between the fiber gratings 9 21 and 9 22.
  • a laser beam having a wavelength of 1117 nm acts as excitation light, and a laser beam having a wavelength of 1175 nm corresponding to the amount of Raman shift is oscillated back and forth between the fiber gratings 931 and 932.
  • the laser light having a wavelength of 1175 nm acts as the excitation light
  • the laser light having a wavelength of 1240 nm corresponding to the amount of Raman shift is emitted back and forth between the fiber gratings 941 and 942.
  • a laser beam having a wavelength of 1240 nm acts as excitation light
  • a laser beam having a wavelength of 1315 nm is oscillated by reciprocating between fiber gratings 951 and 952.
  • a part of the oscillated laser light having a wavelength of 1315 nm is transmitted through a fiber grating 952 having a low reflectance, and is output to the outside as a laser light having a wavelength of 1315 nm.
  • the fiber grating 913 acts so as to reflect the excitation light having a wavelength of 1064 nm, and does not constitute a resonator.
  • a method of externally inputting the output of a rare-earth-doped fiber laser whose power has been increased is used as the pump light source of a conventional Cascade-Draman fiber laser. This makes it possible to obtain laser light of any wavelength that is difficult in the case of a rare-earth doped fiber laser.
  • laser light of an arbitrary wavelength can be obtained by stimulated Prillian scattering as a nonlinear effect, as in the case of stimulated Raman scattering described above.
  • Part of the excitation light has a Brillouin shift of about 10 GHz. It shifts to a lower frequency, and natural Brillouin scattered light is obtained. Then, due to stimulated Brillouin scattering (non-linear effect), natural Brillouin scattered light is amplified while reciprocating between a pair of reflecting means, and finally enters an oscillation state. Then, part of the light in the oscillation state (laser light) passes through the reflection means and is output as laser light of a desired wavelength.
  • stimulated Brillouin scattering since it is backscattering, it has a narrow band gain only in the opposite direction to the excitation light.
  • the wavelength conversion is performed by sequentially oscillating laser light inside the resonator by multiple times of stimulated Raman scattering.
  • the wavelength conversion efficiency as a whole will be greatly improved.
  • the longer the fiber length the greater the loss of oscillating laser light. Therefore, the silica fiber in the Raman fiber laser has an optimum fiber length (resonator length).
  • this conventional Raman fiber laser is composed of a rare-earth doped fiber 110, a silica-based optical fiber 102, and a rare-earth doped fiber.
  • the fiber gratings 110 1 and 110 2 reflect light having a center wavelength
  • the fiber gratings 110 2 and 102 2 emit light having a center wavelength of 2 .
  • the fiber gratings 941 and 942 are configured to reflect light having a center wavelength of 1240 nm
  • the fiber grating 1013 is configured to reflect light having a center wavelength of ⁇ .
  • the fiber gratings 1011, 101, and 1021 have a high reflectance (98% or more) for the light of the target wavelength
  • the fiber gratings 101 2, 1022 have a low reflectance (for example, 15%) with respect to light of a target wavelength.
  • excitation light having a wavelength of 0 is input to the rare-earth doped fiber 110, and spontaneous emission light is emitted.
  • the spontaneous emission light having the center wavelength is amplified in the resonator constituted by the pair of fiber gratings 110 1 and 110 2, and finally enters an oscillation state.
  • a part of the light in the oscillation state passes through the fiber grating 1 ⁇ 12, and is output as a long-wavelength laser beam.
  • the laser light having this wavelength is input to a silica-based optical fin 1020, and the laser light (excitation light) having this wavelength converts the laser light of wavelength ⁇ 2 corresponding to the Raman shift amount into a fiber grating 1. It oscillates back and forth between 0 2 1 and 1 0 2 2. Then, a part of the oscillated laser light of wavelength ⁇ 2 passes through the low-reflectance fiber grating 102 2 and is output to the outside as laser light of wavelength L 2 . Note that the fiber grating 103 acts so as to reflect light of the wavelength ⁇ i, and does not constitute a resonator.
  • a resonator that generates stimulated Raman scattering of the rare-earth doped fino “1010” as the excitation light source and the silica-based optical fino “102” is installed separately. Have been. Therefore, since part of the laser light oscillated inside the resonator is output due to the stimulated emission effect of the rare-earth doped fiber 110, the laser light immediately after being output to the outside is output inside the resonator. The power is much lower than the laser light immediately before In other words, high-power laser light oscillating inside the resonator due to the stimulated emission effect is not directly used as excitation light that causes stimulated Raman scattering.
  • the present invention utilizes both the stimulated emission effect and the non-linear effect, and directly uses laser light oscillated inside the resonator by the stimulated emission effect as excitation light for producing a non-linear effect, and provides laser oscillation due to the non-linear effect. It is an object of the present invention to obtain a fiber laser device capable of performing (wavelength conversion) with high efficiency.
  • the fiber laser device has a wavelength ⁇ .
  • a fiber laser device which receives the pumping light of the above and outputs laser light having a wavelength different from that of the pumping light, comprising: a stimulated emission optical fiber doped with an active medium for activating a stimulated emission effect by the pumping light of the wavelength 0.
  • a reflecting means for the non-linear effect which is spaced apart so as to form an optical resonator for the non-linear effect that oscillates a laser beam of wavelength i (input i ⁇ ⁇ .
  • At least a part of the stimulated emission optical fiber and at least a part of the nonlinear optical fiber are arranged between the pair of stimulated emission effect reflecting means; and at least a part of the nonlinear effect optical resonator. Are arranged inside the above-mentioned optical cavity for stimulated emission effect.
  • FIG. 1 is a configuration diagram schematically showing a fiber laser device according to the present invention.
  • FIG. 2 is a diagram showing a power distribution propagating through a stimulated emission optical fiber and a nonlinear optical fiber in the fiber laser device shown in FIG.
  • FIG. 3 is a configuration diagram schematically showing a fiber laser device according to Embodiment 1 of the present invention.
  • FIG. 4 is a configuration diagram schematically showing a fiber laser device according to Embodiment 2 of the present invention. is there.
  • FIG. 5 is a configuration diagram schematically showing a fiber laser device according to Embodiment 3 of the present invention.
  • FIG. 6 is a configuration diagram schematically showing a fiber laser device according to Embodiment 4 of the present invention.
  • FIG. 7 is a diagram for explaining the field distribution conversion effect of the TEC fiber in the fiber laser device according to the fourth embodiment of the present invention.
  • FIG. 8 is a configuration diagram schematically showing a fiber laser device according to Embodiment 5 of the present invention.
  • FIG. 9 is a configuration diagram schematically showing a fiber laser device according to Embodiment 6 of the present invention.
  • FIG. 10 is a schematic configuration diagram showing a conventional cascade Raman fiber laser device.
  • FIG. 11 is a schematic configuration diagram showing a conventional Raman fiber laser device.
  • FIG. 12 is a diagram showing a power distribution propagating through the stimulated emission optical fiber and the nonlinear optical fiber in the conventional Raman fiber laser device shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a configuration diagram schematically showing a fiber laser device according to the present invention
  • FIG. 2 is a diagram showing a power distribution propagating through a stimulated emission optical fiber and a nonlinear optical fiber in the fiber laser device shown in FIG. .
  • a fiber laser device 100 is connected in series to an optical fiber 110 for stimulated emission containing an active material for activating the stimulated emission effect, and an optical fiber 110 for stimulated emission, and is nonlinearly connected.
  • the pair of fiber gratings 1 1 1 and 1 1 2 have the incident central wavelength ⁇ .
  • the fiber gratings 111, 112, and 121 have a high reflectance with respect to the light having the target center wavelength
  • the fiber grating 122 has a high reflectance with respect to the light having the target center wavelength. It is configured to have low reflectance.
  • a resonator constituted by a pair of fiber gratings 111, 112 constitutes a laser oscillation region by the stimulated emission effect, and constituted by a pair of fiber gratings 121, 122.
  • the resonator thus formed constitutes a laser oscillation region due to the nonlinear effect.
  • the laser oscillation region caused by the non-linear effect is formed inside the laser oscillation region caused by the stimulated emission effect.
  • the stimulated emission optical fiber 110 for example, a rare earth doped fiber in which a rare earth element as an active material is doped into a core serving as the center of a silica-based optical fiber can be used.
  • the optical fiber 120 for example, a doping fiber in which a core serving as the center of a silica-based optical fiber is doped with a large amount of ⁇ as an active substance can be used.
  • the pumping light of this type enters the optical fiber 110 for guided emission through the fiber grating 111.
  • the active substance in the stimulated emission optical fiber 110 is brought into a population inversion state, and spontaneous emission light is emitted.
  • a pair of fiber gratings 1 disposed between the stimulated emission optical fiber 110 and the nonlinear optical fiber 120 in which spontaneous emission light having a center wavelength is connected in series are arranged. It is amplified while reciprocating between 11 and 1 12 and finally enters an oscillating state.
  • the light (laser light) having the center wavelength in this oscillation state acts as pump light when passing through the resonator constituted by the pair of fiber gratings 121 and 122. Due to the nonlinear effect, natural Raman scattered light shifted from the wavelength by a predetermined amount ( ⁇ 2 ) is emitted. The natural Raman scattered light having the center wavelength 2 is amplified while reciprocating between the pair of fiber gratings 121 and 122, and finally enters an oscillation state. Then, a part of the light in the oscillation state (laser light) passes through the fiber grating 122 and is output as laser light of the center wavelength 2 .
  • the laser oscillation region due to the non-linear effect is formed inside the laser oscillation region due to the stimulated emission effect.
  • a pair of fiber gratings 11 1 and 11 2 constituting a resonator for laser oscillation by the stimulated emission effect can both have a high reflectance, and the power of the laser light oscillated inside the resonator can be increased. Can be increased.
  • the optical fiber for nonlinearity 120 is described as including an active substance for activating the nonlinear effect, but it is not necessary to include the active substance.
  • a silica-based optical fiber alone can be used as a non-linear optical fiber.
  • a pair of fiber gratings 121 and 122 are formed in a nonlinear optical fiber 120 to form a set of resonators, and a single nonlinear
  • a plurality of pairs of fiber gratings are formed on the nonlinear optical fiber 120 to configure a plurality of resonators, and the laser oscillation is performed by the nonlinear effect a plurality of times. You may do it.
  • the fiber grating of each pair is formed between the fiber gratings that reflect the laser light of the center wavelength at least a part of the nonlinear optical fiber located between the fiber gratings that reflect the laser light of the center wavelength.
  • at least a part of the non-linear optical fiber located between the fiber gratings that reflects the laser light having the center wavelength 2 is a pair of guides that reflect the laser light having the center wavelength i.
  • the fiber grating as a reflection means for the emission effect is arranged so as to be located between 111 and 112.
  • the efficiency of the first laser oscillation in the nonlinear effect is improved, and the laser light oscillating inside the plural sets of resonators has high power. Therefore, compared with the conventional example in which a rare-earth doped fiber laser and a Cascade-Draman fiber laser are separately configured, it is possible to greatly improve the efficiency of laser oscillation (wavelength conversion) due to multiple nonlinear effects. it can.
  • a pair of fiber gratings 122 and 122 are formed in a nonlinear optical fiber 120 to form a pair of resonators, and Although it is described that laser oscillation is caused by the nonlinear effect, a plurality of pairs of fiber gratings are formed on a plurality of nonlinear optical fibers to configure a plurality of resonators, and laser oscillation caused by the nonlinear effect is performed a plurality of times. You may make it.
  • N is an integer greater than or equal to 2) which consists of a plurality of optical fibers that generate nonlinear effects using pump light as the pump light.
  • Each pair of fiber gratings has an optical fiber that generates nonlinear effects using the laser light of the center wavelength ⁇ as the pump light And a laser beam having a center wavelength of li.
  • a plurality of pairs of fiber gratings have a center wavelength; at least a part of the optical fiber located between the fiber gratings that reflects the laser light of the center wavelength; and a fiber grating that reflects the laser light of the center wavelength i + 1.
  • the efficiency of the first laser oscillation in the nonlinear effect is improved, so that the laser light oscillating inside the plural sets of resonators has a high power.
  • the efficiency of laser oscillation (wavelength conversion) due to multiple nonlinear effects can be greatly improved compared to the conventional example in which a rare-earth-doped fiber laser and a cascade Raman fiber laser are separately configured.
  • a fiber grating is used as the reflection means.
  • the reflection means is not limited to the fiber grating, and may be any as long as it can reflect light to be oscillated by a laser.
  • a mirror can be used.
  • FIG. 3 is a configuration diagram schematically showing a fiber laser device according to Embodiment 1 of the present invention.
  • the fiber laser device 200 is a double-clad rare-earth doped fiber 2 10 (Nd as an active substance is doped in the core serving as the center of a silica-based optical fiber).
  • An optical fiber for stimulated emission a P-doped fiber 220 (non-linear optical fiber) with a large amount of P as an active substance doped in the core that forms the center of a silica-based optical fiber, and a rare earth doped fiber.
  • a pair of fiber gratings 2 formed as a reflection means for the stimulated emission effect formed on the single fiber 210 and the P-doped fiber 220
  • a first resonator constituted by 1 1 and 2 1 2, and a pair of fiber gratings 2 2 1 and 2 formed as reflection means for nonlinear effects formed in the P-doped fiber 220
  • a second resonator composed of a pair of fiber gratings 231 and 232 as reflection means for nonlinear effects formed in the P-doped fiber 220 And three resonators.
  • the fiber gratings 2 1 1, 2 1 2, 2 2 1, 2 2 2 and 2 3 1 have a high reflectivity (99% or more) for the light of the target wavelength, and the fiber grating 2 3 2 is configured to have low reflectance (about 50%) for light of the target wavelength.
  • the rare earth-doped fiber 210 and the P-doped fiber 220 have almost the same mode field diameter, and are connected in series using a fusion splicing method.
  • a first resonator constituted by a pair of fiber gratings 2 1 1 and 2 1 2 constitutes a laser oscillation region (a rare earth doped fiber laser oscillation region) having a wavelength i due to the stimulated emission effect.
  • the second resonator composed of the fiber gratings 2 2 1 and 2 2 2 2 forms a laser oscillation region (Raman fiber laser oscillation region) with a wavelength of 2 due to stimulated Raman scattering, and a pair of fiber gratings.
  • the third resonator composed of 231 and 232 constitutes a laser oscillation region (Raman fiber laser oscillation region) with a wavelength of 3 due to stimulated Raman scattering.
  • the two-wavelength example by stimulated Raman scattering the laser oscillation region of the human 3 is configured in the interior of lasers oscillating region by stimulated emission effect, the laser oscillation wavelength range of lambda 3 by stimulated Raman scattering, wavelength by stimulated Raman scattering and it consists to overlap with a portion of lambda 2 lasing region.
  • an LD having high power characteristics is used as the pump light source, and the diameter of the pump light at the input end of the P-doped fiber 220 and the NA (
  • Numerical Aperture is a P-doped fiber 222 and rare-earth doped fiber.
  • the rare-earth doped fiber 210 having a double clad structure can input high-power excitation light, and can perform laser oscillation at high power by the stimulated emission effect.
  • the pumping light input to the rare earth doped fiber 210 propagates through the first clad of the rare earth doped fiber 210 and excites Nd when passing through the core.
  • a part of the record one laser light of Hachoe 3 is output from the P-doped fiber 2 2 0 through the fiber grating 2 3 2.
  • the rare-earth doped fiber 210 and the P-doped fiber 220 have almost the same mode field diameter, the fusion spliced part 2 of the rare-earth doped fiber 210 and the P-doped fiber 220
  • the field distribution mismatch loss of laser light oscillated by the stimulated emission effect in 51 is small. Therefore, high-power laser oscillation is performed inside the first resonator composed of the pair of fiber gratings 211 and 212, and laser oscillation by stimulated Raman scattering is performed with high efficiency.
  • the wavelength achieves high efficiency in the wavelength conversion from 1 0 excitation Okoshiko to the desired wavelength example 3 of the laser beam o Example 2.
  • FIG. 4 is a configuration diagram schematically showing a fiber laser device according to Embodiment 2 of the present invention.
  • the fiber laser device 300 is a rare-earth doped fiber 310 (double-clad structure) in which Yb as an active substance is doped in a core serving as the center of a silica-based optical fiber.
  • a pair of fiber gratings 3 1 1 and 3 1 2 have the wavelength ⁇ incident.
  • fiber gratings 311, 312, 321, 322, and 331 have high reflectivity (more than 99%) for the light of the target wavelength.
  • the grating 332 is configured to have a low reflectance (approximately 20%) for the light of the target wavelength.
  • the rare-earth doped fiber 310, the P-doped fiber 320, and the Ge-doped fiber 330 have almost the same mode field diameter, and the fusion splicing method is used. They are connected in series.
  • a first resonator composed of a pair of fiber gratings 311 and 312 forms a laser oscillation region (rare-earth fiber laser oscillation region) due to the stimulated emission effect.
  • the second resonator composed of the fiber gratings 32 1 and 32 2 forms a laser oscillation region (Raman fiber laser oscillation region) of wavelength ⁇ 2 by stimulated Raman scattering, and a pair of fiber gratings. 3 3 1, 3 3 2 third resonator formed by the, that make up the laser oscillation wavelength region of lambda 3 by stimulated Raman scattering (Raman fiber laser oscillation region).
  • the oscillation wavelength region of human 2 by stimulated Raman scattering is configured to overlap with a part of the record one
  • the oscillation wavelength region of human i by stimulated emission effects, laser of a wavelength lambda 3 by stimulated Raman scattering The oscillating region is configured to overlap with a part of the laser oscillating region of wavelength ⁇ 2 due to stimulated Raman scattering.
  • the rare-earth-doped fiber 310 having a double clad structure can input a high-power pumping light, Oscillation can be performed.
  • the pumping light input to the rare earth doped fiber 310 propagates through the first clad of the rare earth doped fiber 310 and excites Yb when passing through the core.
  • the pumping light of the wavelength i of the stimulated Raman scattering is propagating back through the P-doped fiber 320 with high power, the oscillation of the laser light of wavelength ⁇ 2 by the stimulated Raman scattering is highly efficient.
  • the excitation light having the wavelength 2 of the stimulated Raman scattering is reflected and propagated through the Ge-doped fiber 330 with high power, so that the laser light of the wavelength 3 is oscillated with high efficiency by the stimulated Raman scattering. .
  • a part of the laser light having the wavelength 3 passes through the fiber grating 332 and is output from the Ge-doped fiber 330.
  • the rare-earth-doped fiber 310, the P-doped fiber 320, and the Ge-doped fiber 330 have almost the same mode field diameter, stimulated emission at the fiber fusion spliced portions 351, 352 Effect and field distribution mismatch loss of laser light oscillated by stimulated Raman scattering are small. Therefore, high-power laser oscillation is performed inside the first resonator composed of the pair of fiber gratings 311 and 312, and laser oscillation by stimulated Raman scattering is performed with high efficiency.
  • FIG. 5 is a configuration diagram schematically showing a fiber laser device according to Embodiment 3 of the present invention.
  • the fiber laser device 400 is a rare-earth doped fiber 4100 (stimulated emission) having a double clad structure in which ⁇ ⁇ as an active material is doped in a core serving as a center of a silica-based optical fiber.
  • Resonator composed of a pair of fiber gratings 4 11 and 4 12 formed as reflection means for stimulated emission effect formed on rare earth doped fiber 4 10
  • a second resonator composed of a pair of fiber bug gratings 4 21 and 4 2 2 formed as reflection means for nonlinear effects formed in the rare earth doped fiber 4 10;
  • the fiber gratings 411, 412, 421, and 4003 have high reflectivity (99% or more) for the target wavelength of light, and the fiber grating 4222 It is configured to have low reflectance (approximately 30%) for light of the wavelength
  • a first resonator composed of a pair of fiber gratings 4 1 1 and 4 1 2 constitutes a laser oscillation region (rare-earth doped fiber laser oscillation region) by the stimulated emission effect, and a pair of fiber gratings.
  • the second resonator composed of 421 and 422 constitutes a laser oscillation region (Raman fiber laser oscillation region) of wavelength 2 due to stimulated Raman scattering.
  • the laser oscillation region is formed inside the laser oscillation region of wavelength 2 due to stimulated Raman scattering.
  • the rare earth-doped fiber 310 having a double clad structure can input a high-power pumping light, Laser oscillation can be performed.
  • the wavelength is long by providing a mirror. Since the pumping light propagates back through the rare-earth-doped fiber 410 with high power, laser oscillation by the stimulated emission effect is performed with high efficiency.
  • the silica-based rare-earth doped fiber 410 is inside the rare-earth-doped fiber laser oscillation region of wavelength i, the laser light of wavelength is used as excitation light for stimulated Raman scattering.
  • Laser light having a wavelength of ⁇ 2 is oscillated between the pair of fiber gratings 421 and 422 by stimulated Raman scattering. Since the excitation light of the stimulated Raman scattering wavelength is repeatedly propagated at high power through the rare-earth-doped fiber 410 acting as the nonlinear optical fiber, the laser light of the wavelength 2 due to the stimulated Raman scattering is obtained. Oscillation is performed with high efficiency.
  • the wavelength example 2 of a part of the laser beam> is output through the fiber grating 4 2 2.
  • FIG. 6 is a configuration diagram schematically showing a fiber laser device according to Embodiment 4 of the present invention.
  • a fiber laser device 500 is composed of a rare earth doped fiber 5100 (guided emission optical fiber) in which a core serving as the center of a silica-based optical fiber is doped with Yb as an active substance.
  • the silica-based optical fiber 520 (non-linear optical fiber) having a mode field diameter smaller than that of the rare-earth doped fiber 510, and the rare-earth doped fiber 510 and the optical fiber 520 TEC connected in series (
  • a second resonator composed of a pair of fiber gratings 52 1 and 52 2 formed as a reflection means for nonlinear effect formed in 52 0, and a rare earth doped fiber 51 1
  • fiber grating 503 As excitation light reflecting means for reflecting the excitation light.
  • the fiber gratings 511, 512, 521, and 503 have high reflectivity (99% or more) for the light of the target wavelength, and the fiber grating 5222 does not. It is configured to have low reflectance (about 50%) for light of different wavelengths.
  • the TEC fiber 530 is disposed between the rare-earth doped fiber 510 and the optical fiber 520, and the mode field diameter of the rare-earth doped fiber 510 and the mode field diameter of the optical fiber 520 Are field distribution conversion means that are mutually converted.
  • the TEC fiber 530 is an optical fiber that can expand the field distribution by partially expanding the refractive index distribution of the core by heat treatment. 0 and the optical fiber 520 are fusion-spliced.
  • a first resonator composed of a pair of fiber gratings 5 1 1 and 5 1 2 constitutes a laser oscillation region (a rare-earth-doped fiber laser oscillation region) by the stimulated emission effect.
  • the second resonator composed of 2 1 and 5 2 2 constitutes a laser oscillation region with a wavelength of 2 due to stimulated Raman scattering (Raman fiber laser oscillation region). Then, the laser oscillation region of wavelength 2 due to stimulated Raman scattering is formed inside the laser oscillation region of wavelength ⁇ i due to the stimulated emission effect.
  • the pump light is reflected by the fiber grating 503 and propagates back through the rare-earth-doped fiber 510 with high power, so that laser oscillation due to the stimulated emission effect is performed with high efficiency.
  • the pumping light input to the rare-earth doped fiber 510 propagates through the core of the rare-earth-doped fiber 510 and excites Yb when passing through the core.
  • This part of the wavelength example 2 single-laser light is output from the optical fiber 5 2 0 through the fiber grating 5 2 2.
  • the mode field diameter of the rare-earth-doped fiber 5100 and the mode field diameter of the optical fiber 520 are mutually converted by the TEC fino 5300, the fusion splicing of laser light by the stimulated emission effect is performed.
  • the field distribution mismatch loss at 551 and 552 is small, and laser oscillation at wavelength 2 by stimulated Raman scattering is performed with high efficiency.
  • the mode field diameter of the optical fiber 520 is small and the excitation light of stimulated Raman scattering propagates back through the optical fiber 520 at a high power density, laser oscillation due to stimulated Raman scattering is highly efficient. Done in
  • the wavelength; High efficiency has been realized in wavelength conversion from the excitation light of this type to the laser light of the desired wavelength 2 .
  • Embodiment 5 the wavelength; High efficiency has been realized in wavelength conversion from the excitation light of this type to the laser light of the desired wavelength 2 .
  • FIG. 8 is a configuration diagram schematically showing a fiber laser device according to Embodiment 5 of the present invention.
  • a fiber laser device 600 is a rare-earth doped fin-type optical fiber in which Yb / Er as an active substance is doped into a core serving as a center of a silica-based optical fiber.
  • the pair of fiber gratings 6 2 1 and 6 2 2 are configured to reflect light of wavelength ⁇ 2 (> 1550 nm) obtained by passing the excitation light of wavelength i. ing.
  • the fin gratings 6 1 1, 6 1 2, 6 2 1, and 6 3 have high reflectivity (99% or more) for the light of the target wavelength, and the fiber grating 6 2 2 It is configured to have low reflectance (about 50%) for the light of the target wavelength.
  • the rare-earth doped fiber 6 10 and the optical fiber 6 20 have substantially the same mode field diameter, and are connected in series using a fusion splicing method.
  • a first resonator constituted by a pair of fiber gratings 6 1 1 and 6 1 2 constitutes a laser oscillation region (a rare-earth-doped fiber laser oscillation region) by induced emission effect, and a pair of fiber gratings.
  • the second resonator composed of the gratings 62 1 and 62 2 constitutes a laser oscillation region (Brillouin fiber laser oscillation region) of wavelength 2 due to stimulated Brillouin scattering.
  • a laser oscillation region of wavelength ⁇ 2 due to stimulated Brillouin scattering is formed inside the laser oscillation region of wavelength ⁇ due to stimulated emission effect.
  • the pumping light is reflected by the fiber grating 603 and propagates back through the rare-earth-doped fiber 610 with high power, so that laser oscillation can be performed with high efficiency by the stimulated emission effect.
  • the excitation light input to the rare earth doped fiber 6 10 is the excitation light input to the rare earth doped fiber 6 10 .
  • Excitation of Yb occurs when the light propagates through the 10 cores and passes through the core, and Er is excited by energy transfer from Yb to Er.
  • the optical fiber 620 is inside the oscillation region of the rare-earth doped fiber laser having the wavelength, the laser light of the person having the wavelength propagates through the optical fiber 620 as excitation light for stimulated Prillian scattering.
  • gain is given at a frequency about 1 OGHz lower than the wavelength (wavelength 2 > 1550 nm).
  • laser light having a wavelength of 2 (> 1550 nm) is oscillated between the pair of fiber gratings 6 21 and 6 22 due to stimulated Prillian scattering.
  • the excitation light of the stimulated Brillouin scattering wavelength is propagating back through the optical fiber 62 with a high power, the oscillation of the laser light of the wavelength ⁇ 2 by the stimulated Brillouin scattering is highly efficient.
  • the oscillating region of Hachoe 2 is a silica-based Fai bus 6 2 0, a silica fiber 6 2 0 as excitation light for inducing Puriruan scattered laser light of Hachoe 2
  • the gain is given to a frequency lower than the wavelength 2 by about 1 OGHz.
  • laser light of multiple wavelengths is oscillated one after another at intervals of about 2 to 10 GHz between a pair of fiber gratings 6 21 and 6 22 by stimulated Brillouin scattering.
  • the excitation light of stimulated Brillouin scattering propagates back through the optical fiber 62 with high power, so that multi-wavelength laser oscillation by stimulated Brillouin scattering is performed with high efficiency.
  • the rare-earth doped fiber 610 and the optical fiber 620 have almost the same mode field diameter, the laser light oscillated by the stimulated emission effect at the fusion spliced portion 651 of the fiber. Low field distribution mismatch loss. Therefore, high-power laser oscillation is performed inside the first resonator composed of the pair of fiber gratings 611 and 612, and laser oscillation by stimulated Brillouin scattering is performed with high efficiency.
  • the wavelength is equal to the wavelength. In this case, high efficiency has been realized in the wavelength conversion from the excitation light to the laser light having a desired wavelength of 2 or more and multi-wavelength.
  • FIG. 9 is a configuration diagram schematically showing a fiber laser device according to Embodiment 6 of the present invention.
  • the fiber laser device 700 is a double-clad rare-earth doped fiber 710 (stimulated emission) in which E as an active substance is doped in the core that forms the center of a silica-based optical fiber.
  • the fiber gratings 731 and 732 are configured to reflect light of wavelength 3 (> 1660 nm) obtained by passing excitation light of wavelength 2 .
  • the fiber gratings 7 1 1, 7 1 2, 7 2 1, 7 2 2, 7 3 1 have a high reflectivity (99% or more) for the light of the target wavelength.
  • 32 is configured to have a low reflectance (about 50%) for light of the target wavelength.
  • the rare earth doped fiber 710 and the Ge doped fiber 720 have almost the same mode field diameter, and are connected in series using a fusion splicing method.
  • the first resonator composed of a pair of fiber gratings 7 1 1 and 7 1 2 constitutes a laser oscillation region (a rare-earth-doped fiber laser oscillation region) by the stimulated emission effect.
  • Consists of 2 1, 7 2 2 Second resonator, stimulated Raman scattering by wavelength constitute a laser oscillation region of L 2 (Ramanfa Ibare one The oscillation region), the third resonance constituted by a pair of fiber grating 7 3 1 7 3 2
  • the laser device constitutes a laser oscillation region (Brillouin fiber laser oscillation region) of wavelength 3 by stimulated Prillian scattering.
  • the laser oscillation region of wavelength 2 due to stimulated Raman scattering and the laser oscillation region of wavelength 3 due to stimulated Brillouin scattering partially overlap the laser oscillation region of wavelength due to the stimulated emission effect. It is configured inside.
  • the rare-earth-doped fiber 7100 having a double clad structure can input a high-power pumping light, and has a high efficiency and a laser due to the stimulated emission effect.
  • One-pulse oscillation can be performed.
  • the pumping light input to the rare earth doped fiber 7 10 propagates through the first cladding of the rare earth doped fiber 7 10 and excites Er when passing through the core.
  • laser light of wavelength 2 is oscillated between the pair of fiber gratings 72 1 and 72 2 by stimulated Raman scattering.
  • the excitation light having the wavelength i of stimulated Raman scattering is reflected and propagated through the Ge-doped fiber 720 at a high power, the oscillation of the laser light having a wavelength of 2 due to the stimulated Raman scattering occurs. Done with efficiency.
  • G e doped fiber 7 2 0 is inside the Raman fiber laser oscillation area of the wavelength example 2, as the excitation light of stimulated Brillouin scattering laser light Hachoe 2
  • a part of the laser light of wavelength 3 passes through the fiber grating 732 and is output from the Ge-doped fiber 720.
  • G e de one Pufaiba 7 laser beam having a wavelength lambda 3 is an excitation light of stimulated Brillouin scattering to have a gain in lower frequencies of the order of 1 0 GH z than the wavelength lambda 3 when propagating through the 2 0.
  • laser light of multiple wavelengths is oscillated one after another at intervals of about 2 to 10 GHz between a pair of fiber bug ratings 731 and 732 by stimulated prillian scattering.
  • the excitation light of stimulated Brillouin scattering propagates back through the Ge-doped fiber 720 with high power, so that multi-wavelength laser oscillation by stimulated Brillouin scattering is performed with high efficiency.
  • the rare-earth-doped fiber 710 and the Ge-doped fiber 7200 have almost the same mode field diameter, the laser light oscillated by the induced emission effect at the fusion spliced section 751 of the fiber is used. Low field distribution mismatch loss. Therefore, high-power laser oscillation is performed inside the first resonator composed of a pair of fiber gratings 7 1 K 7 12, and laser oscillation due to stimulated prilling scattering is performed with high efficiency.
  • the wavelength is human. High efficiency has been achieved in wavelength conversion from the excitation light of the above to a laser light of a multi-wavelength with a desired wavelength of 3 or more.
  • a silica-based optical fiber is used as the stimulated emission optical fiber and the nonlinear optical fiber.
  • the loss of laser light propagating through the silica-based optical fiber is small, and laser oscillation by stimulated Raman scattering and stimulated Prillian scattering is performed with high efficiency.
  • the fibers must be connected by fusion splicing.
  • the loss in the oscillating laser light is reduced, and laser oscillation by stimulated Raman scattering and stimulated Brillouin scattering is performed with high efficiency.
  • a silica-based optical fiber is used as the nonlinear optical fiber.
  • the nonlinear optical fiber is not limited to a silica-based optical fiber. Any substance that produces an effect may be used.
  • a substance in which an active substance is doped into a phosphoric acid-based optical fiber may be used.
  • a silica-based optical fiber having a mode field diameter substantially equal to the mode field diameter of the phosphoric acid-based optical fiber is used for the phosphoric acid-based optical fiber.
  • the resonator can be simply configured simply with optical fibers.
  • the silica-based optical fiber and the phosphoric acid-based optical fiber connected in series constitute a nonlinear optical fiber.
  • stimulated emission optical fiber induced emission effect by the excitation light active medium to activate doped and comprise at least a portion of said stimulated emission optical fiber, by the stimulated emission effects as the excitation light of the wavelength lambda 0
  • the above-mentioned stimulated emission optical fiber comprising: a nonlinear effect reflecting means which is spaced apart so as to constitute a nonlinear effect optical resonator for oscillating laser light of 1 person and 1 person. of At least a portion and at least a portion of the nonlinear optical fiber are disposed between the pair of reflection means for stimulated emission effect, and at least a portion of the optical resonator for nonlinear effect is constituted by the stimulated emission effect optical resonator. It is configured inside.
  • high-power laser light oscillated inside the stimulated emission effect resonator can be directly used as excitation light for the nonlinear effect resonator, so that laser oscillation due to the nonlinear effect can be performed with high efficiency.
  • a fiber laser device is obtained.
  • the at least one part of the non-linear optical fiber positioned between the pair of reflecting means for reflecting the laser light of the wavelength i is a pair of reflections for reflecting the laser light of the wavelength ⁇ i + i.
  • at least a part of the non-linear optical fiber positioned between the pair of reflecting means for reflecting the laser light of the wavelength 2 is located at a position between the means. Position between the pair of stimulated emission effect reflecting means for reflecting light Because it is arranged to so that it is possible to perform laser oscillation by nonlinear effect of multiple times with a high efficiency.
  • the reflecting means for nonlinear effect is configured to generate the above-described nonlinear effect by using the laser light having the wavelength i as excitation light. It comprises a plurality of pairs of reflecting means defined to include at least a part of the optical fiber and to reflect the laser light having the wavelength i.
  • At least a part of the optical fiber positioned between the pair of reflecting means for reflecting the laser light is positioned between the pair of reflecting means for reflecting the laser light of the wavelength I i + i. disposed, and the laser light of the wavelength e 2
  • at least a part of the optical fiber positioned between the pair of reflecting means for emitting light is disposed between the pair of stimulated emission effect reflecting means for reflecting the laser light having the wavelength i. Therefore, laser oscillation due to the nonlinear effect can be performed multiple times with high efficiency.
  • the stimulated emission optical fiber and the non-linear optical fiber are made of silica-based light. Since it is a fiber, the loss of laser light propagating through the optical fiber is reduced, and laser oscillation due to the nonlinear effect is performed with high efficiency.
  • the above-mentioned stimulated emission optical fiber has at least a double clad structure formed on the outer periphery of the core, it is possible to input a high-power excitation light to the stimulated emission optical fiber, and the stimulated emission effect is obtained. Laser oscillation is performed with high efficiency, and a highly precise laser beam can be obtained.
  • the stimulated emission optical fiber also serves as the nonlinear optical fiber, the configuration of the fiber laser device can be simplified.
  • the mode field diameter of the nonlinear optical fiber is formed to be equal to the mode field diameter of the stimulated emission optical fiber, the connection portion between the stimulated emission optical fiber and the nonlinear optical fiber is formed. Thus, the field distribution mismatch loss of the laser beam at the point is reduced.
  • Field distribution converting means is disposed between the stimulated emission optical fiber and the nonlinear optical fiber, and the mode field diameter of the stimulated emission optical fiber and the mode field diameter of the nonlinear optical fiber are different. Since the mutual conversion is performed by the field distribution converting means, the field distribution mismatch loss of the laser light at the connection between the stimulated emission optical fiber and the nonlinear optical fiber is reduced.
  • Excitation light reflecting means for reflecting the excitation light of the wavelength 0 is disposed on at least a part of the stimulated emission optical fiber.
  • the laser beam is stimulated by the stimulated emission effect at high power.
  • each resonator is controlled by an optical fiber. It can be composed only of fiber, and loss in oscillating laser light is reduced.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)

Abstract

L'invention concerne un laser à fibre optique dans lequel on peut réaliser l'oscillation laser (conversion de longueur d'onde) avec une grande efficacité par le biais d'un effet non linéaire en exploitant directement à la fois un effet d'émission induite et un effet non linéaire et en exploitant le faisceau laser en oscillation dans un résonateur comme lumière de pompage pour provoquer l'effet non linéaire. Dans le laser à fibre optique, une fibre optique pour émission induite est reliée en série avec une fibre optique pour l'effet non linéaire par épissurage par fusion. Des réseaux de fibres sont fournis dans la fibre optique pour émission induite ainsi que la fibre optique pour un effet non linéaire, ce qui permet de constituer une paire de dispositifs de réflexion pour un effet d'émission induite à distance l'un de l'autre, et les réseaux de fibres sont fournis dans la fibre optique pour un effet non linéaire et à distance les uns des autres pour constituer une paire de dispositifs de réflexion pour un effet non linéaire. Au moins une partie d'une région d'oscillation laser, dans laquelle l'oscillation laser est produite par un effet non linéaire constitué par la paire de dispositifs de réflexion pour un effet non linéaire, est formée dans une région d'oscillation laser, l'oscillation laser étant produite par un effet d'émission induite.
PCT/JP2001/004282 2001-05-22 2001-05-22 Laser a fibre optique WO2002095885A1 (fr)

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JP2006108426A (ja) * 2004-10-06 2006-04-20 Kansai Electric Power Co Inc:The 光ファイバラマンレーザ
JP2007103704A (ja) * 2005-10-05 2007-04-19 Nichia Chem Ind Ltd 発光装置、レーザディスプレイ、内視鏡
JP2008023262A (ja) * 2006-07-25 2008-02-07 Nichia Chem Ind Ltd 発光装置、レーザディスプレイ、内視鏡
JP2009016454A (ja) * 2007-07-02 2009-01-22 Advantest Corp モードロックレーザ装置
JP2011151223A (ja) * 2010-01-22 2011-08-04 Nikon Corp レーザ装置
JP2012204372A (ja) * 2011-03-23 2012-10-22 Olympus Corp 短パルス光源およびレーザ走査顕微鏡システム
JP2012527018A (ja) * 2009-05-11 2012-11-01 オーエフエス ファイテル，エルエルシー フィルター・ファイバーに基づくカスケード・ラマン・ファイバー・レーザー・システム
US11451006B2 (en) * 2018-03-30 2022-09-20 Fujikura Ltd. Fiber laser device, production method for fiber laser device, and setting method
WO2023141030A1 (fr) * 2022-01-19 2023-07-27 Ipg Photonics Corporation Procédé et appareil de réglage contrôlable de paramètres de faisceau

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006108426A (ja) * 2004-10-06 2006-04-20 Kansai Electric Power Co Inc:The 光ファイバラマンレーザ
JP2007103704A (ja) * 2005-10-05 2007-04-19 Nichia Chem Ind Ltd 発光装置、レーザディスプレイ、内視鏡
JP2008023262A (ja) * 2006-07-25 2008-02-07 Nichia Chem Ind Ltd 発光装置、レーザディスプレイ、内視鏡
JP2009016454A (ja) * 2007-07-02 2009-01-22 Advantest Corp モードロックレーザ装置
JP2012527018A (ja) * 2009-05-11 2012-11-01 オーエフエス ファイテル，エルエルシー フィルター・ファイバーに基づくカスケード・ラマン・ファイバー・レーザー・システム
JP2015084113A (ja) * 2009-05-11 2015-04-30 オーエフエス ファイテル，エルエルシー フィルター・ファイバーに基づくカスケード・ラマン・ファイバー・レーザー・システム
JP2017126088A (ja) * 2009-05-11 2017-07-20 オーエフエス ファイテル，エルエルシー フィルター・ファイバーに基づくカスケード・ラマン・ファイバー・レーザー・システム
JP2011151223A (ja) * 2010-01-22 2011-08-04 Nikon Corp レーザ装置
JP2012204372A (ja) * 2011-03-23 2012-10-22 Olympus Corp 短パルス光源およびレーザ走査顕微鏡システム
US11451006B2 (en) * 2018-03-30 2022-09-20 Fujikura Ltd. Fiber laser device, production method for fiber laser device, and setting method
WO2023141030A1 (fr) * 2022-01-19 2023-07-27 Ipg Photonics Corporation Procédé et appareil de réglage contrôlable de paramètres de faisceau

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