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    • 23. 发明申请
    • EXTERNAL RESONATOR TYPE WAVELENGTH VARIABLE SEMICONDUCTOR LASER
    • 外部谐振器类型波长可变半导体激光器
    • US20100111119A1
    • 2010-05-06
    • US12593513
    • 2008-02-06
    • Kenji SatoKenji MizutaniShinya SudoKoji Kudo
    • Kenji SatoKenji MizutaniShinya SudoKoji Kudo
    • H01S5/06H01S5/14
    • H01S5/141
    • In an external resonator type semiconductor wavelength tunable laser apparatus using a wavelength tunable mirror or a wavelength tunable filter which uses a refractive index change of liquid crystal, a resonant frequency is set as FR, when a response of the refractive index change to a drive voltage frequency of liquid crystal becomes maximum. A frequency F1 of a drive AC power supply voltage to control the refractive index of liquid crystal is set to a frequency largely different from FR. A wavelength tunable mirror or a wavelength tunable filter is driven with a signal in which a dither AC signal F2 of a frequency close to the FR and an AC power supply voltage are superimposed. A PD to monitor a light output from the laser controls an amplitude of the drive AC power voltage such that an amplitude of the dither AC signal F2 become minimum. Thus, high laser mode stability is realized.
    • 在使用波长可调镜或使用液晶的折射率变化的波长可调滤波器的外部谐振器型半导体波长可调激光装置中,当折射率的响应变化为驱动电压时,共振频率被设定为FR 液晶的频率变得最大。 控制液晶的折射率的驱动交流电源电压的频率F1被设定为与FR大不相同的频率。 波长可调谐镜或波长可调滤波器由其中叠加了频率接近FR的频率抖动交流信号F2和交流电源电压的信号驱动。 用于监视来自激光器的光输出的PD控制驱动AC电源电压的幅度,使得抖动AC信号F2的幅度变得最小。 因此,实现了高激光模式的稳定性。
    • 24. 发明授权
    • External resonator type wavelength-variable laser
    • 外部谐振器型波长可变激光器
    • US07656911B2
    • 2010-02-02
    • US11632213
    • 2005-05-25
    • Kenji MizutaniKoji KudoKenji SatoJan De Merlier
    • Kenji MizutaniKoji KudoKenji SatoJan De Merlier
    • H01S5/10
    • H01S5/141H01S3/1062H01S5/005H01S5/02216H01S5/02248H01S5/02415H01S5/02438H01S5/02446H01S5/02492H01S5/0625H01S5/1039
    • To facilitate phase adjustment in an external resonator type wavelength-variable laser. An external resonator type wavelength-variable laser (50) includes a semiconductor light amplifier (1), a wavelength selection filter (3) having periodic frequency characteristics, an external resonator (6), and a wavelength-variable filter (4). Δf is divided into one or more regions. The following conditions are satisfied for one Δfi region: mj=(j×Δffs)/ΔfFP where Δffs: a period of the wavelength selection filter, ΔfFP: a Fabry-Perot mode interval dependent on a length of the external resonator, j: an integer not smaller than 1 and not larger than (Δfi/Δffs). A coefficient Mj is an integer obtained by rounding off the first digit after decimal point of the coefficient mj. A coefficient Ni,j is an integer obtained by discarding the first digit after decimal point of Δfi/(j×Δffs). In this regard, a relation of (|Ni,j×2π(Mj−mj)|
    • 为了促进外部谐振器型波长可变激光器的相位调整。 外部谐振器型波长可变激光器(50)包括半导体光放大器(1),具有周期性频率特性的波长选择滤波器(3),外部谐振器(6)和波长可变滤波器(4)。 Deltaf分为一个或多个区域。 对于一个Deltafi区域,满足以下条件:mj =(jxDeltaffs)/ DeltafFP其中Deltaffs:波长选择滤波器的周期,DeltafFP:取决于外部谐振器长度的法布里 - 珀罗模式间隔,j:不整数 小于1并且不大于(Deltafi / Deltaffs)。 系数Mj是通过舍入系数mj的小数点后的第一位数而获得的整数。 系数Ni,j是通过丢弃Deltafi /(jxDeltaffs)小数点后的第一位数获得的整数。 在这方面,对于一个j,满足(| Ni,jx2pi(Mj-mj)|
    • 26. 发明申请
    • External Resonator Type Wavelength-Variable Laser
    • 外部谐振器类型波长可变激光器
    • US20080025349A1
    • 2008-01-31
    • US11632213
    • 2005-05-25
    • Kenji MizutaniKoji KudoKenji SatoJan De Merlier
    • Kenji MizutaniKoji KudoKenji SatoJan De Merlier
    • H01S5/14
    • H01S5/141H01S3/1062H01S5/005H01S5/02216H01S5/02248H01S5/02415H01S5/02438H01S5/02446H01S5/02492H01S5/0625H01S5/1039
    • To facilitate phase adjustment in an external resonator type wavelength-variable laser. An external resonator type wavelength-variable laser (50) includes a semiconductor light amplifier (1), a wavelength selection filter (3) having periodic frequency characteristics, an external resonator (6), and a wavelength-variable filter (4). Δf is divided into one or more regions. The following conditions are satisfied for one Δfi region: mj=(j×Δffs)/ΔFP where Δffs: a period of the wavelength selection filter, ΔfFP: a Fabry-Perot mode interval dependent on a length of the external resonator, j: an integer not smaller than 1 and not larger than (Δfi/Δffs). A coefficient Mj is an integer obtained by rounding off the first digit after decimal point of the coefficient mj. A coefficient Ni,j is an integer obtained by discarding the first digit after decimal point of Δfi/(jΔffs). In this regard, a relation of (|Ni,j×2π(Mj−mj)|
    • 为了促进外部谐振器型波长可变激光器的相位调整。 外部谐振器型波长可变激光器(50)包括半导体光放大器(1),具有周期性频率特性的波长选择滤波器(3),外部谐振器(6)和波长可变滤波器(4)。 Deltaf分为一个或多个区域。 对于一个Deltaf 区域满足以下条件:m(j)=(jxDeltaf&lt; fs)/ Delta&lt;&lt;&lt; Deltaf :波长选择滤波器的周期,DeltafFP:取决于外部谐振器的长度的法布里 - 珀罗模式间隔,j:不小于1且不大于(Deltaf < SUB>我 / Deltaf fs )。 系数M N是通过舍入系数m≠j的小数点后的第一数位而获得的整数。 系数N i,j是通过丢弃Deltaf i(jDeltaf&lt; fs&gt;)的小数点之后的第一位获得的整数。 在这方面,满足(| N 1,j 2 x 2 pi(M 1 -j j 2)|π2)的关系 一个j。
    • 27. 发明授权
    • Method for screen position correcting in screen printing
    • 丝网印刷中屏幕位置校正方法
    • US06205925B1
    • 2001-03-27
    • US09289853
    • 1999-04-12
    • Hiroyuki OhiraShinichi ArayaKoji Kudo
    • Hiroyuki OhiraShinichi ArayaKoji Kudo
    • B41L302
    • B41F15/10H05K3/1216
    • Methods and apparatus for adjusting the position of a printing screen having a center of rotation mounted on a screen frame for use in screen printing processes are disclosed. The apparatus includes a screen frame with a printing screen mounted thereon, a screen frame holder, a plurality of first arcuate guides mounted on the screen frame defining an arc with a predetermined circumference defined by a predetermined radius, a plurality of guide rollers mounted on the screen frame holder and corresponding to the plurality of first arcuate guides whereby the plurality of guide rollers movably supports the plurality of first arcuate guides and an adjustment mechanism adapted to urge the screen frame around the center of rotation of the printing screen.
    • 公开了用于调整安装在屏幕框架上的旋转中心的打印屏幕的位置用于丝网印刷处理的方法和装置。 该装置包括安装有印刷屏幕的屏幕框架,屏幕框架保持器,安装在屏幕框架上的多个第一弧形引导件,其限定具有由预定半径限定的预定周长的圆弧;多个安装在 并且对应于所述多个第一弓形导向件,由此所述多个导辊可移动地支撑所述多个第一弓形引导件,以及调节机构,其适于围绕所述印刷丝网的旋转中心推动所述筛网框架。
    • 28. 发明授权
    • Laser diode array and fabrication method thereof
    • 激光二极管阵列及其制造方法
    • US5953359A
    • 1999-09-14
    • US946766
    • 1997-10-08
    • Masayuki YamaguchiHiroyuki YamazakiKoji Kudo
    • Masayuki YamaguchiHiroyuki YamazakiKoji Kudo
    • H01S3/082H01S5/00H01S5/026H01S5/12H01S5/20H01S5/227H01S5/40H01S3/19H01L21/20H01S3/08
    • H01S5/0265H01S5/4031H01S5/12H01S5/1215H01S5/2077H01S5/2272H01S5/4087
    • First to n-th single-axial-mode LDs are arranged on a semiconductor substrate, where n.gtoreq.2. Each of the first to n-th LDs has a stripe-shaped semiconductor active layer formed on or over the substrate, a stripe-shaped semiconductor guiding layer formed on one side of the active layer, and a stripe-shaped semiconductor cladding layer formed on the other side of the active layer. The guiding layers of the first to n-th LDs have first to n-th diffraction gratings, respectively. The (k+1)-th period is equal to a sum of the k-th period and an increment, where 1.ltoreq.k S (n-1). The active layers of the first to n-th LDs have first to n-th gain peak wavelengths, respectively. The (k+1)-th gain peak wavelength is equal to a sum of the k-th gain peak wavelength and an increment. The first to n-th LDs have first to n-th oscillation wavelengths with first to n-th wavelength differences from the first to n-th gain peak wavelengths, respectively. The first to n-th wavelength differences are within a specific acceptable range for low threshold currents and low wavelength chirping. The lasing characteristic fluctuation is limited within the acceptable range independent of an oscillation wavelength span of the LDs.
    • 第一至第n单轴模式LD布置在半导体衬底上,其中n≥2。 第一至第n LD中的每一个具有形成在基板上或上方的条状半导体有源层,形成在有源层的一侧上的条形半导体引导层和形成在有源层的一侧上的条形半导体包层 活动层的另一面。 第一至第n LD的引导层分别具有第一至第n衍射光栅。 第(k + 1)个周期等于第k个周期和一个增量的和,其中1≤kS(n-1)。 第一至第n LD的有源层分别具有第一至第n增益峰值波长。 第(k + 1)个增益峰值波长等于第k个增益峰值波长和增量的和。 第一至第n LD分别具有从第一至第n增益峰值波长的第一至第n波长差异的第一至第n振荡波长。 对于低阈值电流和低波长啁啾,第一至第n波长差在特定的可接受范围内。 激光特性波动受限于可接受的范围,与LD的振荡波长跨度无关。