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51. 发明授权

US06466714B1 Method of producing phase mask for fabricating optical fiber and optical fiber with bragg's diffraction grating produced by using the phase mask 有权
$Method of producing phase mask for fabricating optical fiber and optical fiber with bragg's diffraction grating produced by using the phase mask$
标题翻译：使用相位掩模制造具有布拉格衍射光栅的制造光纤和光纤的相位掩模的方法
公开(公告)号：US06466714B1
公开(公告)日：2002-10-15
申请号：US09284613
申请日：1999-04-27
申请人： Masaaki Kurihara , Toshikazu Segawa , Tetsuro Komukai , Masataka Nakazawa
发明人： Masaaki Kurihara , Toshikazu Segawa , Tetsuro Komukai , Masataka Nakazawa
IPC分类号： G02B634
CPC分类号： G02B6/02138 , G03F1/34 , G03F7/001 , G03F7/70283 , G03F7/7035 , G03F7/704 , G03F7/70475 , H01J2237/31766
摘要： The invention relates to a method of fabricating an optical fiber-processing phase mask in which a stitching error ascribable to a deterioration in the wavelength selectivity of the optical fiber diffraction grating to be fabricated is reduced. At an exposure step, a writing stage 5 with a phase mask blank 10 placed thereon is continuously fed in one direction while portions of the phase mask blank corresponding to grooves 26 or strips 27 in a direction perpendicular to the direction of feeding are sequentially scanned with writing beams 14, whereby the entire area of the phase mask blank 10 to be written is continuously written.
摘要翻译：本发明涉及一种制造光纤加工相位掩模的方法，其中由于待制造的光纤衍射光栅的波长选择性的劣化导致的缝合误差降低。在曝光步骤中，在其上放置有相位掩模板10的写入阶段5沿着一个方向连续地馈送，而与垂直于馈送方向的方向对应于凹槽26或条带27的相位掩模毛坯的部分依次扫描写入光束14，从而连续写入要写入的相位掩模板10的整个区域。

52. 发明授权

US06333942B1 Atomic frequency standard laser pulse oscillator 有权
标题翻译：原子频率标准激光脉冲振荡器
公开(公告)号：US06333942B1
公开(公告)日：2001-12-25
申请号：US09461181
申请日：1999-12-14
申请人： Masataka Nakazawa , Eiji Yoshida
发明人： Masataka Nakazawa , Eiji Yoshida
IPC分类号： H01S310
CPC分类号： H01S3/06791 , G04F5/14 , H01S3/1109 , H01S3/1121 , H01S3/1394
摘要： An ultra-stable microwave output with less jitter than a prior art atomic oscillator is obtained and an ultra-short optical pulse train is generated with a repetition frequency stabilized at the same level as a time standard. The repetition frequency of a regeneratively mode-locked laser pulse oscillator with a superior low-jitter characteristic is locked directly to a resonance frequency of various atoms. The oscillator provides the means for detecting the frequency difference between the clock signal frequency and a predetermined atomic resonance frequency and outputting it as an error signal, a cavity length tuning device for varying the length of a laser cavity so that the clock signal frequency and the predetermined resonance frequency coincide, and a device for negatively feeding back the error signal output from the frequency difference detection device to the cavity length tuning device. This allows the generation of an optical pulse train (optical output) and a clock signal (microwave output) of a repetition frequency stabilized to the predetermined atomic resonance frequency.
摘要翻译：获得具有比现有技术的原子振荡器更少的抖动的超稳定微波输出，并且产生具有稳定在与时间标准相同水平的重复频率的超短光脉冲串。具有优异低抖动特性的再生锁模激光脉冲振荡器的重复频率直接锁定到各种原子的共振频率。振荡器提供用于检测时钟信号频率和预定原子共振频率之间的频率差并将其作为误差信号输出的装置，用于改变激光腔的长度的腔长调谐装置，使得时钟信号频率和预定的谐振频率一致，以及用于将从频差检测装置输出的误差信号负反馈给腔长调谐装置的装置。这允许产生稳定到预定原子共振频率的重复频率的光脉冲串（光输出）和时钟信号（微波输出）。

53. 发明授权

US5926492A Laser pulse oscillator 失效
标题翻译：激光脉冲振荡器
公开(公告)号：US5926492A
公开(公告)日：1999-07-20
申请号：US919354
申请日：1997-08-28
申请人： Eiji Yoshida , Masataka Nakazawa
发明人： Eiji Yoshida , Masataka Nakazawa
IPC分类号： G02B26/00 , G02F1/01 , H01S3/06 , H01S3/067 , H01S3/098 , H01S3/139 , H04B10/00 , H04B10/508 , H04B10/524 , H04B10/54 , H04B10/564 , H01S3/07 , H01S3/10
CPC分类号： H01S3/06791 , H01S3/1109 , H01S3/1121 , H01S3/1394
摘要： A harmonically and regeneratively mode-locked laser pulse oscillator having a clock extraction circuit for picking up from a fragment of a laser output a clock signal corresponding to a high-order integer multiple of the fundamental frequency determined by the cavity length of the laser, a phase shifter and an electric amplifier for driving an optical modulator disposed in the laser cavity at the frequency of the clock signal. The laser pulse oscillator has a phase-locked loop including a phase comparator for detecting the phase difference between the clock signal and an external signal fed from a synthesizer with its frequency fixed, a fiber stretcher for controlling the cavity length such that the repetition rate frequency of the laser pulse oscillator is locked to the external signal, and an electric filter and electric amplifier for expanding and contracting the fiber length by feeding back the phase difference detected by the phase comparator to the fiber stretcher. This makes it possible to lock the repetition rate frequency of the optical pulse train to the external signal, and to generate the stabilized, fixed frequency optical pulse train with a high repetition rate over a long time period.
摘要翻译：具有用于从激光片拾取的时钟提取电路的谐振和再生模式锁定激光脉冲振荡器输出对应于由激光器的腔体长度确定的基频的高次整数倍的时钟信号，移相器和用于以时钟信号的频率驱动设置在激光器腔中的光学调制器的电放大器。激光脉冲振荡器具有锁相环，该锁相环包括用于检测时钟信号与从其频率固定的合成器馈送的外部信号之间的相位差的相位比较器，用于控制腔体长度的光纤拉伸器，使得重复频率频率的激光脉冲振荡器被锁定到外部信号，以及电滤波器和电放大器，用于通过将相位比较器检测到的相位差反馈到光纤拉伸器来扩展和收缩光纤长度。这使得可以将光脉冲串的重复率频率锁定到外部信号，并且可以在长时间段内产生具有高重复率的稳定的固定频率光脉冲串。

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