WO2006016410A1 - 基本波光源及び波長変換器 - Google Patents
基本波光源及び波長変換器 Download PDFInfo
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- WO2006016410A1 WO2006016410A1 PCT/JP2004/011613 JP2004011613W WO2006016410A1 WO 2006016410 A1 WO2006016410 A1 WO 2006016410A1 JP 2004011613 W JP2004011613 W JP 2004011613W WO 2006016410 A1 WO2006016410 A1 WO 2006016410A1
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- Prior art keywords
- laser diode
- semiconductor
- optical waveguide
- optical
- semiconductor laser
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/14—External cavity lasers
- H01S5/141—External cavity lasers using a wavelength selective device, e.g. a grating or etalon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/065—Mode locking; Mode suppression; Mode selection ; Self pulsating
- H01S5/0651—Mode control
- H01S5/0652—Coherence lowering or collapse, e.g. multimode emission by additional input or modulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/14—External cavity lasers
- H01S5/146—External cavity lasers using a fiber as external cavity
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/50—Amplifier structures not provided for in groups H01S5/02 - H01S5/30
Definitions
- the present invention relates to a high-output fundamental wave light source and a wavelength converter used as a light source for a laser printer, a laser display device, an optical memory device, and the like.
- This MOPA element is a master oscillator with a DBR (Distributed Bragg Reflector) structure that outputs single transverse mode and single longitudinal mode light, and a flare-type semiconductor optical amplifier that amplifies while maintaining the quality of the light beam.
- DBR Distributed Bragg Reflector
- Application examples include a combination with a wavelength conversion element equipped with a multimode optical waveguide, and a configuration example in which a diffraction grating is disposed on the back surface of a tapered semiconductor optical amplifier (see, for example, Patent Document 1).
- a conventional wavelength converter includes a master oscillator that oscillates in a single longitudinal mode by arranging a diffraction grating on the back surface of a semiconductor laser diode element, and returns light to the master oscillator.
- An optical isolator having a second optical isolator for preventing return light to the semiconductor optical amplifier and obtaining a stable optical output is disclosed.
- a master oscillator that oscillates in an injection-locked mode by arranging a diffraction grating in front of a semiconductor laser diode element to constitute a resonator and performing high frequency modulation on the semiconductor laser diode element is provided.
- a taper-type semiconductor optical amplifier is provided in the subsequent stage and oscillates in a pulse-like waveform is disclosed (for example, see Patent Document 3).
- a semiconductor laser diode is used as a gain medium by reducing the front reflectance, and a Bragg diffraction grating (hereinafter referred to as optical fiber grating) formed in an optical fiber is used as a semiconductor.
- optical fiber grating a Bragg diffraction grating formed in an optical fiber.
- the power to compose a laser diode element and an external resonator and oscillate in a single longitudinal mode There is also a disclosure of a configuration in which the output light is optically coupled with a wavelength conversion element.
- a single transverse mode of a semiconductor laser diode is supported by maintaining the polarization plane of the optical fiber (see, for example, Patent Document 4).
- Patent Document 1 USP5321718 (Column 6-12, Fig. 5, Fig. 7-8, Fig. 10)
- Patent Document 2 USP5745284 (3rd-8th columns, Fig. 1)
- Patent Document 3 USP5561676 (Column 3-5, Fig. 1, Fig. 7-10)
- Patent Document 4 JP-T 11-509933 (page 2-12, Fig. 1)
- a relatively small output light from the master oscillator is input to the optical isolator.
- a semiconductor optical amplifier has an active layer and an active layer formed by a slight reflected return light from external forces. Since the light distribution in the horizontal plane changes, there is still a problem that an expensive optical isolator for preventing reflected return light is also required at the output part of the semiconductor optical amplifier.
- a semiconductor laser diode element and a diffraction grating constitute a resonator, and an appropriate high-frequency signal is stored in the semiconductor laser diode element.
- an expensive optical isolator is not required, but on the other hand, a high-frequency generation circuit is required, or a pulsed optical output is generated in time, and a continuous wave cannot be obtained.
- the semiconductor laser diode element shown in the wavelength converter shown in Patent Document 4 maintains a lateral single mode in the optical waveguide incorporating the active layer, and therefore the lateral width is about 4 / m. It was the limit. In order to prevent light damage at the emission end face, a window structure is provided to lower the light density, but the light output is considerably small. There was a problem that the number of accidental failures due to optical damage caused by defects in the layer increased, and the lifetime was significantly shortened.
- an antireflection film is provided on the front surface of the semiconductor laser diode element to form a gain medium, and a resonator is constituted by a diffraction grating (hereinafter referred to as an optical fiber grating) provided in the optical fiber. Since single mode oscillation was used, there was still a problem that the spectrum would fluctuate if there was an external return light.
- the present invention has been made to solve the above-described problems, and it is possible to reduce optical output fluctuations and spectrum fluctuations with respect to external reflection to the master oscillator, and to reduce the laterality of the semiconductor optical amplifier with respect to external reflections.
- a fundamental light source that also reduces fluctuations in the light distribution in the direction
- the present invention provides an optical waveguide element that maintains the polarization of the semiconductor laser diode element and an optical waveguide element that is disposed in the optical waveguide element and that feeds back part of the light to the semiconductor laser diode element. And a semiconductor optical amplifier optically coupled to the optical waveguide element so that the semiconductor laser diode element oscillates in a coherent collapse mode.
- a fundamental wave light source is provided in which fluctuations in optical output and spectrum fluctuations due to external reflection to the master oscillator are reduced, and fluctuations in the lateral light distribution of the semiconductor optical amplifier with respect to external reflections are also reduced. There is an effect that can.
- FIG. 1 is a configuration diagram of a wavelength converter according to a first embodiment of the present invention.
- FIG. 2 is a vertical sectional view of a wavelength converter according to Embodiment 1 of the present invention.
- FIG. 3 is a configuration diagram of a wavelength converter according to a second embodiment of the present invention.
- FIG. 4 is a configuration diagram of a wavelength converter according to a third embodiment of the present invention.
- FIG. 5 is a configuration diagram of a wavelength converter according to a fourth embodiment of the present invention.
- FIG. 1 is a diagram showing the configuration of the wavelength converter according to the first embodiment of the present invention.
- a semiconductor laser diode element 1 is a Fabry-Perot resonator type laser diode element having an active layer of a single quantum well and a waveguide la.
- This semiconductor laser diode element 1 has a maximum gain value in the 900 nm band, which is twice the wavelength of 450 nm, which is blue, and has a highly reflective film with a reflectance of 90% on the back surface to increase the light extraction efficiency.
- a low reflection film having a reflectance of 0.5% is applied, and the semiconductor laser diode element 1 oscillates in a multi-longitudinal mode.
- the waveguide la is composed of an active layer, a light guide layer, and a cladding layer in the thickness direction, and oscillates in a single transverse mode.
- the confinement as a waveguide is loose, it is excited in the basic mode, that is, in the single transverse mode when the current injection is small, but when the current injection becomes large and the light density becomes high, the spatial hole burning effect increases.
- the next mode is characterized by being easily excited. still In general, the polarization extinction ratio is above the threshold, and it is generally close to 27 dB at the element output position.
- a polarization-maintaining fiber is employed as the optical waveguide element 2, and the wavelength selective reflection element 3 including a Bragg diffraction grating is arranged by irradiating the core portion with ultraviolet rays through a phase mask. What you set is manufactured.
- Polarization-preserving fiber prevents the coupling of both modes by changing the propagation speed of the HE11 even mode and HE1 1 odd mode, which are propagation modes. The linearly polarized wave is maintained.
- the equivalent refractive index of the optical waveguide 2a is slightly different between the first axis and the slot axis, the reflection peak wavelength of the reflective element 3 is shifted depending on the axial direction.
- the electric field direction is aligned with the slow axis so as to be resistant to bending loss.
- the polarization extinction ratio is 20 dB or more at the output end although it deteriorates due to the stress when the lens 5 and the optical waveguide element 2 are fixed.
- the outgoing beam 4a of the semiconductor laser diode element 1 has a flat waveguide la, it is optically coupled to the optical waveguide element 2 having the circular optical waveguide 2a having a large external ratio with a low loss.
- the aspect ratio is corrected by using the lens 5 as an asymmetric optical system.
- the gain band of the semiconductor laser diode element 1 has a single quantum well structure, so the wavelength dependence is relatively gentle. If the reflection peak wavelength of the reflection element 3 is set in this gain band, the vicinity of the reflection peak wavelength Gain is maximized, and the oscillation wavelength of the semiconductor laser diode element 1 is controlled.
- the longitudinal mode by this composite resonator is simply a longitudinal mode because of the relationship between the phase relationship of the optical length of the semiconductor laser diode element 1 and the reflecting element 3 and the amount of light returning from the reflecting element 3 to the semiconductor laser diode element 1. It is well known that it can oscillate in various states such as single mode, multimode, and coherent collapse mode.
- the back surface reflectance and the front surface reflectance of the semiconductor laser diode element 1 are respectively set to 90 so as to oscillate in a coherent collapse mode that is resistant to reflected return light from the outside. / o and 0.5%, resonator length 1.8 mm, reflection element 3 reflectivity 3%, reflection bandwidth 0.4 nm, coupling efficiency with lens 5 80%, and output light line width 0.3 nm.
- the coherent collapse mode is relaxed by the reflected return light from the reflective element. In addition, even if reflected return light comes from the outside, it is hardly affected.
- the transverse mode is set by setting the reflection peak wavelength of the reflection element 3 to be longer than the cutoff wavelength of the semiconductor laser diode element 1. Higher order can be prevented, and stable single transverse mode oscillation can be achieved up to a fiber end optical output of 600 mW.
- the optical output 4b of the semiconductor laser diode element 1 is detected by a monitoring photodiode 6 disposed on the rear surface, and a control circuit (not shown) controls the forward current of the semiconductor laser diode element 1 based on the monitor output. Then, the outgoing beam 4a is stabilized.
- the tapered semiconductor optical amplifier 7 has a mode field diameter of 50 xm in the horizontal direction with respect to the incident side surface, 500 ⁇ on the emission side, a flare angle of 6 degrees, a chip length of 1.6 mm, and IEEE PHOTONICS TECHNOLOGY LETTER, Vol. 5, No. 10, pp. 1179-11
- the optical waveguide 2a of the optical waveguide element 2 has a shape similar to that shown in FIG. However, a non-injection region for current is arranged near the end face, and an antireflection film is further applied. Since the light beam emitted from the optical waveguide 2a of the optical waveguide element 2 is circular, it is converted into a horizontally long beam shape by the cylindrical lens 8 to reduce the mode matching loss, and the semiconductor optical amplifier 7 Optically coupled to waveguide 7a.
- the light density in the lateral direction of the input section is about 1 mW / ⁇ ⁇ as a guideline. It is enough. Now, when the incident light 4c is about 300mW and the forward current is 7A, the light output 4d is about 5W.
- the semiconductor optical amplifier 7 has antireflection films on both end faces, so that the input light beam is amplified by traveling waves, so the device and operating conditions to prevent the lens effect due to carriers and heat are appropriately selected. This makes it possible to amplify while maintaining a beam quality close to that of diffraction-limited light.
- the amplification factor is set to 10 times to 100 times, but here the incident light quantity is adjusted in order to reduce the generation of spatial holging by reducing the electron density and photon density in the waveguide 7a. ing.
- the linearly polarized light of the optical waveguide element 2 is inputted to the active layer of the taper type semiconductor optical amplifier 7 in the horizontal direction, and the output maintains the linearly polarized light as it is.
- the semiconductor laser diode element 1 emits in the coherent collapse mode state. Since the oscillating light is incident, the semiconductor optical amplifier 7 amplifies the spectrum with a low coherence spectrum, so that it is less affected by reflected light from the outside. The characteristics of a semiconductor optical amplifier that easily forms a solid oscillation mode are significantly improved, and a high-output fundamental wave with good beam quality is obtained.
- the wavelength conversion element 9 is made of a non-linear optical crystal such as LiNbO to which MgO is added at 5% or more.
- a spontaneous periodic polarization reversal structure in which the fundamental wave and the second harmonic are quasi-phase-matched is formed.
- a clad layer and a support layer are provided so that both second harmonics can propagate in a single mode.
- the polarization direction of the semiconductor optical amplifier 7 and the polarization direction of the wavelength conversion element 9 coincide.
- the wavelength conversion element 9 has a slab-type waveguide structure 9a in which the refractive index is not confined in the horizontal direction of the surface. This is because light damage due to the photorefractive effect is a concern if the light density is too high. On the other hand, the higher the light density, the better the wavelength conversion efficiency. Optimization has been made in consideration of the above.
- the length of the wavelength conversion element is 10 mm
- the spectrum line width of the fundamental wave is 0.3 nm
- the peak light intensity is about 10 MW / cm 2
- the wavelength conversion efficiency is less than 50%.
- FIG. 2 is a view showing a vertical section of the wavelength converter according to the first embodiment of the present invention.
- the wavelength temperature characteristic of the fundamental wave of the semiconductor laser diode element 1 is mainly due to the temperature characteristic of the reflection element 3, and the wavelength temperature coefficient is 0.008 nm / ° C.
- the semiconductor laser diode element 1 has a gain peak wavelength temperature characteristic of 0.4 nm / ° C, a force S, and a single quantum well has a wide gain band. In an environment of about ° C, stable oscillation can be obtained without adjusting the temperature of the semiconductor laser diode element 1.
- the semiconductor optical amplifier 7 In addition, in the semiconductor optical amplifier 7, a fundamental wave output of 5 W is obtained at a current of 7 A, and about 6 W is generated. This waste heat is a very serious problem.At present, the semiconductor optical amplifier 7 has a junction-down structure, and heat is diffused by the heat sink 14 through the aluminum nitride substrate 13 having good thermal conductivity. Air cooled through. On the other hand, it is well known that the temperature characteristics of wavelength conversion efficiency due to the quasi phase matching condition of the wavelength conversion element 9 are large and require precise temperature control.
- the first temperature detecting means 15a is disposed in the vicinity of the reflecting element 3, and the second temperature detecting means is used for temperature control.
- the wavelength conversion efficiency is stabilized by arranging 15b near the wavelength conversion element 9 and adjusting the Peltier element 16 by an external electronic circuit (not shown).
- a thermistor element is used as the temperature detecting means 15a, 15b.
- the temperature of the semiconductor laser diode element 1 and the semiconductor optical amplifier 7 is not controlled is shown for power saving.
- the temperature may be controlled.
- the temperature control element of the wavelength conversion element 9 is the Peltier element 16, but the wavelength control element 9 may be operated at a high temperature using the temperature control element as a heater, and the photorefractive effect is achieved. You can expect the recovery of defects.
- a semiconductor laser diode element As described above, according to the first embodiment, as a fundamental wave light source, a semiconductor laser diode element, an optical waveguide element that maintains the polarization of the semiconductor laser diode element, and an optical waveguide element are disposed.
- the semiconductor laser diode element includes a reflective element that feeds back part of light to the semiconductor laser diode element, and a semiconductor optical amplifier optically coupled to the optical waveguide element.
- the semiconductor laser diode element oscillates in a coherent collapse mode. Reduces optical output fluctuations and spectrum fluctuations due to external reflections on the oscillator and prevents external reflections. Thus, it is possible to provide a fundamental light source in which the fluctuation of the light distribution in the lateral direction of the semiconductor optical amplifier is reduced.
- the semiconductor optical amplifier has the active layer that becomes wider in the horizontal direction in accordance with the light traveling direction. Therefore, it is possible to reduce the incident power to the semiconductor optical amplifier. S is effective, and the filament phenomenon hardly occurs.
- the optical waveguide element is made of a polarization-maintaining optical fiber, it can be guided to the optical amplifier while maintaining the linearly polarized light from the semiconductor laser diode element.
- a semiconductor laser diode element, an optical waveguide element that maintains the polarization of the semiconductor laser diode element, and the semiconductor laser diode are disposed in the optical waveguide element.
- a reflection element that feeds back a part of light to the element, a semiconductor optical amplifier optically coupled to the optical waveguide element, a periodically poled structure that is quasi-phase matched to the fundamental wave from the semiconductor optical amplifier, and at least a semiconductor optical It has a wavelength conversion element that has an optical waveguide that can propagate the fundamental wave from the amplifier, and the semiconductor laser diode element oscillates in a coherent collapse mode, which stabilizes a continuous wave of high output in the short wavelength band. Can be output.
- the optical density is optimized. Can be set to any value.
- the wavelength conversion element also has a large output of several W incident on the single-mode waveguide, it will deteriorate due to the optical refraction effect, etc., so the light density needs to be lowered.
- the wavelength conversion efficiency will deteriorate, so it is necessary to set the light density to an appropriate level.
- the slab waveguide confines light in the waveguide only in one direction, it is intermediate between the single mode waveguide and the balter (having no waveguide), and an optimum value can be obtained.
- At least one temperature detection unit and at least one temperature control unit are provided, the temperature of the reflection element is detected, and the temperature of the wavelength conversion element is controlled. Therefore, the temperature control of the wavelength conversion element is reliably performed, and as a result, desired characteristics can be obtained as the wavelength converter.
- FIG. 3 is a configuration diagram of a wavelength converter according to the second embodiment.
- a force obtained by mode conversion of the optical coupling between the optical waveguide element 2 and the semiconductor optical amplifier 7 using the cylindrical lens 8 is used instead of the cylindrical lens 8 as shown in FIG.
- a slab type waveguide element 8a made of a quartz waveguide may be used.
- the configuration other than the slab type waveguide element 8a is the same as that of the first embodiment shown in FIGS. Omitted.
- the slab-type waveguide element 8a has a high coupling efficiency by making the mode field diameter in the vertical direction substantially the same by making the relative refractive index difference between the core and the clad approximately the same as that of the optical waveguide element 2 at the incident end.
- the waveguide 7a of the semiconductor optical amplifier 7 and the mode field diameter are matched to the cylindrical processing of the vertical surface.
- the slab-type waveguide element 8a spreads in the spatial mode in the horizontal direction due to the refractive index waveguide structure, and has the same mode field diameter as the waveguide 7a of the semiconductor optical amplifier 7.
- the optical coupling between the optical waveguide element and the semiconductor optical amplifier is performed using the slab type waveguide element made of the quartz waveguide. The same effect as that of the wavelength converter having the cylindrical lens in 1 is obtained.
- FIG. 4 is a configuration diagram of a wavelength converter according to the third embodiment.
- the optical waveguide element 2 uses a polarization-maintaining fiber.
- the optical waveguide element 2 may be composed of an optical waveguide element 2b made of quartz. .
- the mode field diameter is matched with the waveguide 7a of the semiconductor optical amplifier 7. good.
- Other configurations are the same as those in the first embodiment or the second embodiment.
- the optical waveguide 2a of the optical waveguide element 2b is a linear one.
- the same effect can be obtained even if the optical waveguide 2a is reduced in size by using repeated reflection or bending waveguides. Needless to say, you can get it.
- the optical waveguide is changed to an optical waveguide element made of quartz. Since the optical waveguides are arranged, the same effects as the fundamental wave light source and wavelength converter in the first embodiment can be obtained.
- FIG. 5 is a configuration diagram of a wavelength converter according to the fourth embodiment.
- linearly polarized light of the optical waveguide element (or polarization-preserving fiber) 2 is input to the active layer of the tapered semiconductor optical amplifier 7 in the horizontal direction, and input.
- the output shows a linear array that maintains the linear polarization as it is and is coupled to the waveguide of the X-cut wavelength converter.
- a wavelength conversion element with a Z-cut substrate that can create a deep periodic domain-inverted layer can be considered easily.
- semiconductor laser diode elements have a higher end face reflectivity than TE mode, and are more confined.
- Many semiconductor optical amplifiers are designed for the TE mode because the gain of the mode is higher than that of the TE mode.
- TM mode gain can be increased by applying tensile strain to the quantum well.
- the optical waveguide 2a is arranged to propagate the linearly polarized wave of the semiconductor laser diode element 1, and the optical output from the optical waveguide 2a is a TM wave in the semiconductor optical amplifier 7. It is arranged to amplify.
- 2c and 2d denote the incident end face and the outgoing end face of the optical waveguide element 2
- 3a and 3b denote the electric field direction of the incident end face 2c and the electric field direction of the outgoing end face 2d, respectively.
- the TE (Transverse Electric) mode is an electric field (there is a magnetic field in the vertical direction and the traveling direction) in the horizontal direction of the active layer.
- the TM (Transverse Magnetic) mode is a magnetic field (in the vertical direction) in the active layer horizontal direction. And there is an electric field in the direction of travel).
- the TM wave is a TM mode polarization.
- the semiconductor optical amplifier 7 only needs to have some gain with respect to the TM mode. This is because the linearly polarized light of the optical waveguide element 2 (or polarization-maintaining fiber) is converted into the activity of the semiconductor optical amplifier 7. The polarization is input in the direction perpendicular to the layer, and the output remains linearly polarized, and is coupled to the waveguide of the Z-cut wavelength converter 9.
- the optical waveguide element is disposed so as to propagate the linearly polarized wave of the semiconductor diode element, and the optical output from the optical waveguide element is amplified by the semiconductor optical amplifier. Since it is arranged to amplify with a TM wave in the device, it is possible to use a Z-cut wavelength conversion element, and as a result, an effect of being easy to manufacture as a wavelength converter is obtained.
- the substrate of the wavelength conversion element is a Z-cut substrate, a large cross-sectional area (wide and deep) periodic polarization inversion region can be formed.
- the fundamental light source and the wavelength converter according to the present invention have a master oscillator in which fluctuations in light intensity and optical spectrum are small with respect to reflected return light, and reflection return when the light is amplified. It provides a high-power fundamental wave light source composed of a semiconductor optical amplifier that is not easily affected by light intensity distribution by light, and is suitable for use as a light source for laser printers, laser display devices, optical memory devices, etc. RU
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/011613 WO2006016410A1 (ja) | 2004-08-12 | 2004-08-12 | 基本波光源及び波長変換器 |
JP2006531093A JP4213184B2 (ja) | 2004-08-12 | 2004-08-12 | 基本波光源及び波長変換器 |
US11/597,360 US7693194B2 (en) | 2004-08-12 | 2004-08-12 | Fundamental-wave light source and wavelength converter |
CN2004800434575A CN1977430B (zh) | 2004-08-12 | 2004-08-12 | 基本波光源及波长变换器 |
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PCT/JP2004/011613 WO2006016410A1 (ja) | 2004-08-12 | 2004-08-12 | 基本波光源及び波長変換器 |
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US (1) | US7693194B2 (ja) |
JP (1) | JP4213184B2 (ja) |
CN (1) | CN1977430B (ja) |
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US7693194B2 (en) | 2010-04-06 |
CN1977430A (zh) | 2007-06-06 |
JPWO2006016410A1 (ja) | 2008-05-01 |
JP4213184B2 (ja) | 2009-01-21 |
CN1977430B (zh) | 2010-11-24 |
US20070230527A1 (en) | 2007-10-04 |
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