WO2005015304A1 - 青色レーザ光の発振方法および装置 - Google Patents
青色レーザ光の発振方法および装置 Download PDFInfo
- Publication number
- WO2005015304A1 WO2005015304A1 PCT/JP2004/011399 JP2004011399W WO2005015304A1 WO 2005015304 A1 WO2005015304 A1 WO 2005015304A1 JP 2004011399 W JP2004011399 W JP 2004011399W WO 2005015304 A1 WO2005015304 A1 WO 2005015304A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical waveguide
- crystal
- light
- blue laser
- slab
- Prior art date
Links
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
- G02F1/37—Non-linear optics for second-harmonic generation
- G02F1/377—Non-linear optics for second-harmonic generation 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
- G02F2202/00—Materials and properties
- G02F2202/20—LiNbO3, LiTaO3
Definitions
- the present invention relates to a method and an apparatus for oscillating blue laser light.
- High power blue laser light is demanded as a light source for laser displays and the like. Its output needs to be 1 W or more, depending on the size of the display. They must also be small and highly efficient.
- the desired wavelength is, for example, 450-460 nm.
- the output of a semiconductor laser device that directly oscillates blue laser light is only several tens of mW and is not generally available.
- the laser light oscillation device becomes large and the oscillation efficiency is low.
- a blue laser beam of 0.84 W is obtained from a pump power of 16.7 W, and the light-to-light conversion efficiency is 5%.
- the light-to-light conversion efficiency can be increased.
- the output of blue laser light is 250 mW, and it is difficult at present to obtain a pet-class output. For this reason
- a high-power fundamental wave is made incident on the ridge-type optical waveguide, the power density of the light confined in the optical waveguide becomes too high, and the output of the blue laser light becomes unstable.
- a lithium lithium niobate crystal has a slight absorption for blue light.
- a part of the blue light oscillated from the potassium lithium niobate crystal is absorbed in the device, and heat is generated in the device.
- the phase matching condition (phase matching wavelength) of a lithium niobate-based lithium crystal varies with the temperature of the device. For this reason, when the temperature of the device rises due to the heat generated in the device, the phase matching wavelength changes, the oscillation efficiency of the blue light decreases, and the output decreases. When the output of blue light decreases, no heat is generated inside the device, and the temperature of the device decreases.
- the phase matching wavelength in the device returns to the initial condition, the oscillation efficiency of blue light increases, and the output of blue light from the device increases.
- the output of the blue light from the device fluctuates and is considered to be unstable. Such output fluctuations are not found when the output of the fundamental wave is low, so it seems that this has not been a problem in the past.
- An object of the present invention is to provide a method and an apparatus for oscillating blue laser light, which have a relatively high conversion efficiency and can improve the output of blue laser light.
- the present invention provides a broadband semiconductor laser oscillating device A laser beam output from the slab optical waveguide by making the output light from the slab optical waveguide incident on the slab optical waveguide made of a nonlinear optical crystal as a fundamental wave.
- the present invention includes a Fabry-Perot type broad area semiconductor laser oscillation device and a slab optical waveguide made of a nonlinear optical crystal, and causes the laser beam oscillated from the oscillation device to enter the slab optical waveguide as a fundamental wave. Accordingly, the present invention relates to a blue laser light oscillation device, wherein blue laser light is output from a slab optical waveguide.
- the inventor has widened the ridge width of a wavelength conversion element using a ridge-type optical waveguide made of a nonlinear optical crystal to provide a slab optical waveguide and a laser beam from a Fabry-Perot-type broadband semiconductor laser. Input as a fundamental wave.
- a slab optical waveguide made of a nonlinear optical crystal was used instead of the polarization inversion method. Since the slab width cannot be increased in the domain-inverted optical waveguide for the above-mentioned reason, the optical power density cannot be reduced, and the allowable wavelength range of the convertible fundamental wave is very narrow. In the present invention, since a slab optical waveguide made of a nonlinear optical crystal is used, it is possible to increase the slab width and reduce the optical power density, and at the same time, to widen the allowable wavelength width of the fundamental wave. Can be.
- Fabry-Perot broad-area semiconductor lasers have a wide wavelength range but high output.
- a slab optical waveguide made of a nonlinear optical crystal with a wide allowable wavelength range a high-power fundamental wave can be used and the optical power density can be reduced.
- the slab width of the slab optical waveguide is not limited. The light coupling efficiency can be increased by matching the emission size of the mouth-type broad area semiconductor laser with the slab width of the slab optical waveguide. Therefore, it is possible to obtain a high-output blue laser beam and to reduce the decrease in light-to-light conversion efficiency.
- FIG. 1 is a schematic diagram showing a blue laser light oscillation device 1 of the present invention.
- FIG. 2 is a graph showing the relationship between the output of the fundamental wave and the output of the blue laser light.
- FIG. 1 is a schematic diagram showing an oscillation device 1 of the present invention.
- the output light A from the Fabry-Perot type broad area semiconductor laser 2 is condensed by the optical systems 3 and 4 and is incident on the wavelength conversion element 5.
- the wavelength conversion element 5 includes a substrate 7 and a slab optical waveguide 8.
- a harmonic B is output from the slab optical waveguide 8 as shown by an arrow B.
- the center wavelength of the blue laser light oscillated by the device of the present invention is, for example, 390 nm-540 nm.
- Devices that oscillate such short-wavelength light can be used in a wide range of applications such as optical disk memory, medical use, photochemistry, and various types of optical measurement.
- the nonlinear optical crystal is not particularly limited as long as it has the ability to convert the wavelength of light.
- the nonlinear optical crystal is preferably a crystal having a tungsten bronze structure containing potassium and lithium. Particularly preferred are lithium lithium diborate and lithium lithium niobate monolithium lithium tantalate solid solution.
- Nb, Ta, K, and Li can be substituted within a range that maintains the tungsten bronze structure.
- K and Li can be replaced by Na and Rb.
- the substitution ratio is preferably 10 atomic% or less, when potassium or lithium is 100 atomic%.
- An alkali metal or alkaline earth metal element can be added to the lithium lithium niobate or lithium lithium niobate solid solution. It is also possible to add a laser oscillation doping agent such as a rare earth element such as Cr, Er or ⁇ d.
- a slab-type optical waveguide is a waveguide that has a function of confining light in a specific direction (vertical direction in Fig. 1) when viewed in a cross section perpendicular to the direction in which light propagates. It has a function to propagate one or more guided modes.
- the slab mode propagating light refers to light propagating in a specific direction (up and down in the case of FIG. 1) in the slab type optical waveguide or the two-dimensional optical waveguide.
- the slab mode propagating light is usually a multimode propagating light propagating in a plurality of waveguide modes.
- the thickness of the slab-type optical waveguide is not particularly limited, but is set so that the optimum efficiency is obtained depending on the wavelength of the light to be used and the light condensing property of the light propagating through the slab waveguide.
- the thickness of the slab optical waveguide is preferably 10 m or less, and more preferably 5 m or less, from the viewpoint of light propagation efficiency. If the slab optical waveguide is too thin, the slab optical waveguide is cut off, and off-mode light may seep out. Therefore, from this viewpoint, the thickness of the slab optical waveguide is preferably 2 m or more.
- the material of the substrate 7 is not particularly limited, and examples thereof include lithium niobate, lithium tantalate, magnesium oxide, aluminum oxide, strontium titanate, and glass.
- the substrate 7 can be formed from a nonlinear optical crystal as described above.
- Thermal expansion coefficient C of nonlinear optical crystal and thermal expansion coefficient S of material constituting substrate 7 are preferably close to each other.
- the ratio (SZC) of the coefficient of thermal expansion S of each support material to the coefficient of thermal expansion C of the nonlinear optical crystal is preferably 0.6 to 1.4, and 0.85 to 1.4. More preferably, it is 15.
- the slab optical waveguide 8 can be formed in the surface region of the substrate 7 by a titanium diffusion method or a proton exchange method.
- the slab optical waveguide can be formed by bonding a plate made of a nonlinear optical crystal to the substrate 7 and then polishing the plate.
- the plate and the substrate 7 can be joined by the following method.
- an organic adhesive for example, epoxy resin, acrylic resin, polyurethane resin, polyimide resin, silicone resin.
- the plate and the substrate 7 are bonded by diffusion bonding, crimping, and optical contact.
- the slab optical waveguide can be formed by forming a thin film made of lithium niobate lithium crystal on a plate-like substrate.
- a forming method for example, a MOCVD method can be exemplified.
- the device of the present invention can further include a reflection grating section for fixing the wavelength of light incident on the optical waveguide layer, and a temperature control means for controlling the temperature of the optical waveguide layer.
- a reflection grating section for fixing the wavelength of light incident on the optical waveguide layer
- a temperature control means for controlling the temperature of the optical waveguide layer.
- a plate-shaped body made of Z-cut lithium niobate lithium with a length of 15 mm, a width of 15 mm, and a thickness of 0.5 mm was prepared. This plate was obtained by the micro-pull-down method. Further, a soda glass substrate 7 having a length of 20 mm, a width of 20 mm, and a thickness of l mm was prepared. Each joint surface between the plate and the substrate 7 was chemically and mechanically polished to a flatness of 0.5 m or less. Both were adhered at 150 ° C. using a heat-curable adhesive to obtain an adhesive sample. The thickness of the adhesive layer between the plate and the substrate 7 was about 0.5 ⁇ m.
- a lithium lithium niobate substrate was chemically and mechanically polished to form a slab optical waveguide 8 having a thickness of about 3 / m and a width of 100 ⁇ m.
- the adhesive sample was cut with a dicer to obtain a chip having a length of 3.5 mm, and both end surfaces of the chip were optically polished.
- the chip was further cut with a dicer to obtain a device 5 having a width of 2 mm, a thickness of 1.5 mm, and a length of 3 mm.
- An antireflection (AR) coat for light having a wavelength of 920 nm and a wavelength of 460 nm was applied to both end faces of the element 5, respectively.
- a second harmonic was generated.
- a Fabry-Perot broad-area semiconductor laser (emitter size 100 ⁇ mx 1 jm) oscillating at a wavelength of 920 nm was used. This laser was optically coupled to the slab optical waveguide using lenses 3 and 4.
- a second harmonic having a wavelength of 460 nm oscillated As a result, a second harmonic having a wavelength of 460 nm oscillated.
- the output of fundamental wave A was changed as shown in Fig. 2.
- the output of the second harmonic increased in proportion to the square of the fundamental power.
- the fundamental wave output was 3 W, a blue laser beam with an output of 500 mW oscillated.
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Semiconductor Lasers (AREA)
- Lasers (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04748286A EP1653278A4 (en) | 2003-08-06 | 2004-08-02 | BLAULAR BEAM OSCILLATION PROCESS AND EQUIPMENT |
US11/329,019 US20060120415A1 (en) | 2003-08-06 | 2006-01-10 | Blue laser beam oscillating method and system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003206366A JP2005055528A (ja) | 2003-08-06 | 2003-08-06 | 青色レーザ光の発振方法および装置 |
JP2003-206366 | 2003-08-06 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/329,019 Continuation US20060120415A1 (en) | 2003-08-06 | 2006-01-10 | Blue laser beam oscillating method and system |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005015304A1 true WO2005015304A1 (ja) | 2005-02-17 |
Family
ID=34131381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/011399 WO2005015304A1 (ja) | 2003-08-06 | 2004-08-02 | 青色レーザ光の発振方法および装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060120415A1 (ja) |
EP (1) | EP1653278A4 (ja) |
JP (1) | JP2005055528A (ja) |
CN (1) | CN1829940A (ja) |
WO (1) | WO2005015304A1 (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7403549B2 (en) | 2003-10-01 | 2008-07-22 | Mitsubishi Denki Kabushiki Kaisha | Wavelength conversion laser and image display |
JP4449976B2 (ja) | 2006-12-26 | 2010-04-14 | セイコーエプソン株式会社 | 外部共振型レーザ光源装置 |
WO2009107473A1 (ja) | 2008-02-27 | 2009-09-03 | 日本碍子株式会社 | 波長変換素子 |
JP5358224B2 (ja) | 2009-03-05 | 2013-12-04 | 日本碍子株式会社 | 波長変換素子の製造方法 |
JP5074436B2 (ja) | 2009-03-06 | 2012-11-14 | 日本碍子株式会社 | 高調波発生素子 |
JP2010224235A (ja) | 2009-03-24 | 2010-10-07 | Ngk Insulators Ltd | 波長変換素子 |
JP5534768B2 (ja) * | 2009-09-29 | 2014-07-02 | 富士紡ホールディングス株式会社 | 研磨パッド |
JP4862960B2 (ja) * | 2010-12-10 | 2012-01-25 | 三菱電機株式会社 | 波長変換レーザ装置および画像表示装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04337714A (ja) * | 1991-05-15 | 1992-11-25 | Fuji Photo Film Co Ltd | バルク型共振器構造の光波長変換装置 |
US5321718A (en) * | 1993-01-28 | 1994-06-14 | Sdl, Inc. | Frequency converted laser diode and lens system therefor |
JP2002250949A (ja) * | 2000-03-21 | 2002-09-06 | Matsushita Electric Ind Co Ltd | 光導波路素子、光波長変換素子および光導波路素子の製造方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4884277A (en) * | 1988-02-18 | 1989-11-28 | Amoco Corporation | Frequency conversion of optical radiation |
EP0784881A4 (en) * | 1994-10-03 | 1997-09-17 | Sdl Inc | TUNABLE BLUE LASER DIODE |
EP0961160B1 (en) * | 1998-05-27 | 2005-03-30 | Ngk Insulators, Ltd. | A second harmonic wave-generation device |
US6631231B2 (en) * | 2000-03-21 | 2003-10-07 | Matsushita Electric Industrial Co., Ltd. | Optical waveguide elements, optical wavelength conversion elements, and process for producing optical waveguide elements |
JP2003295244A (ja) * | 2002-04-02 | 2003-10-15 | Ngk Insulators Ltd | 青色レーザ光発生装置および青色レーザ光の発生方法 |
-
2003
- 2003-08-06 JP JP2003206366A patent/JP2005055528A/ja active Pending
-
2004
- 2004-08-02 EP EP04748286A patent/EP1653278A4/en not_active Withdrawn
- 2004-08-02 WO PCT/JP2004/011399 patent/WO2005015304A1/ja active Application Filing
- 2004-08-02 CN CNA2004800220896A patent/CN1829940A/zh active Pending
-
2006
- 2006-01-10 US US11/329,019 patent/US20060120415A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04337714A (ja) * | 1991-05-15 | 1992-11-25 | Fuji Photo Film Co Ltd | バルク型共振器構造の光波長変換装置 |
US5321718A (en) * | 1993-01-28 | 1994-06-14 | Sdl, Inc. | Frequency converted laser diode and lens system therefor |
JP2002250949A (ja) * | 2000-03-21 | 2002-09-06 | Matsushita Electric Ind Co Ltd | 光導波路素子、光波長変換素子および光導波路素子の製造方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1653278A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1653278A1 (en) | 2006-05-03 |
JP2005055528A (ja) | 2005-03-03 |
EP1653278A4 (en) | 2009-09-09 |
CN1829940A (zh) | 2006-09-06 |
US20060120415A1 (en) | 2006-06-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2008522432A (ja) | 耐久性高パワーレーザの波長変換用非線形水晶の改良 | |
US7164525B2 (en) | Wavelength converting devices | |
WO2004025363A1 (ja) | 波長変換モジュール | |
US20060120415A1 (en) | Blue laser beam oscillating method and system | |
JPWO2007032402A1 (ja) | レーザ光源、およびそれを用いたディスプレイ装置 | |
US7859743B2 (en) | Harmonics generating devices | |
US6807210B2 (en) | Systems and a method for generating blue laser beam | |
JP3129028B2 (ja) | 短波長レーザ光源 | |
US20120077003A1 (en) | Method of nonlinear crystal packaging and its application in diode pumped solid state lasers | |
JP3156444B2 (ja) | 短波長レーザ光源およびその製造方法 | |
US6628692B2 (en) | Solid-state laser device and solid-state laser amplifier provided therewith | |
JP2005057043A (ja) | 固体レーザ装置及び波長変換光学部材の製造方法 | |
US7911683B2 (en) | Harmonic generator | |
JP4657228B2 (ja) | 波長変換素子 | |
JPS61189686A (ja) | レ−ザ装置 | |
JP2921208B2 (ja) | 波長変換素子および短波長レーザ光源 | |
JP2003258341A (ja) | 直線偏光ファイバレーザー及び第二高調波出力共振器構造 | |
JPH07202309A (ja) | 短波長レーザ光源 | |
WO2013140432A1 (ja) | レーザ装置 | |
JPH04335586A (ja) | レーザーダイオードポンピング固体レーザー | |
JPH06265952A (ja) | 光波長変換素子 | |
Gan et al. | 61.1: watt level compact green laser module for laser display | |
JPH0499079A (ja) | レーザーダイオードポンピング固体レーザー | |
JP2006292942A (ja) | 第2高調波発生装置 | |
JP2008047775A (ja) | Shgレーザ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200480022089.6 Country of ref document: CN |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 11329019 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2004748286 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2004748286 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 11329019 Country of ref document: US |