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    • 3. 发明授权
    • Apparatus and method for controlling tracking servo in near field optics
    • 用于控制近场光学中的跟踪伺服的装置和方法
    • US07656765B2
    • 2010-02-02
    • US11285208
    • 2005-11-23
    • Jeong Kyo SeoYun Sup ShinJin Yong Kim
    • Jeong Kyo SeoYun Sup ShinJin Yong Kim
    • G11B7/00
    • G11B7/0903
    • Disclosed are an apparatus and a method for controlling a tracking servo in a near field optics. Gap error signals are detected in a divided state, and a push pull signal is compensated based on the detected gap error signals. A photo detector detecting the gap error signals is divided into two areas such that movement of an image formed on the photo detector can be detected. The push pull signal is compensated by subtracting a value proportional to a difference value between the two gap error signals detected in the photo detector. The difference value between the two gap error signals is proportional to a dc offset component included in the push pull signal. Accordingly, it is possible to simply remove a dc offset included in a push pull signal without largely modifying the near field optics, so that it is possible to exactly perform a tracking servo operation.
    • 公开了一种用于控制近场光学器件中的跟踪伺服的装置和方法。 在分割状态下检测间隙误差信号,并且基于检测到的间隙误差信号来补偿推挽信号。 检测间隙误差信号的光电检测器被分成两个区域,使得可以检测在光电检测器上形成的图像的移动。 通过减去与光检测器中检测到的两个间隙误差信号之间的差值成比例的值来补偿推挽信号。 两个间隙误差信号之间的差值与包括在推挽信号中的直流偏移分量成比例。 因此,可以简单地去除包括在推挽信号中的直流偏移,而不会大幅度地修改近场光学元件,使得可以精确地执行跟踪伺服操作。
    • 6. 发明授权
    • Highly repetitive laser employing a rotating wedge
    • 使用旋转楔的高度重复的激光
    • US5790584A
    • 1998-08-04
    • US673679
    • 1996-06-25
    • Hong-Jin KongHyun-Su KimYun-Sup Shin
    • Hong-Jin KongHyun-Su KimYun-Sup Shin
    • H01S3/00H01S3/04H01S3/10H01S3/08
    • H01S3/10076H01S3/005H01S3/0401
    • The present invention relates to a highly repetitive laser employing a rotating wedge, and more specifically, a laser employing a rotating wedge which can provide a laser beam having a uniform spatial intensity profile with a high repetition rate. The highly repetitive laser of the invention is characterized by positioning a rotating wedge between a main resonator and a focusing lens to change the point in which a laser beam emitted from the main resonator is focused, in a laser which comprises a main resonator consisting of a laser medium, a passive Q-switching material and partially reflective mirrors and an auxiliary resonator consisting of a focusing lens and a cell. The present invention can improve the efficiency of high-power conventional lasers; and, therefore, it can be applied in advanced experiments such as second harmonic generation and amorphous silicon annealing and in the precision industry which requires a highly repetitive laser, since it can provide a laser beam having a uniform pattern and high directional properties.
    • 本发明涉及一种使用旋转楔的高度重复的激光,更具体地,涉及一种采用旋转楔的激光,其可以提供具有高重复率的均匀空间强度分布的激光束。 本发明的高度重复的激光器的特征在于,在主谐振器和聚焦透镜之间定位旋转楔,以改变从主谐振器发射的激光束聚焦的点,激光器包括主谐振器,该主谐振器由 激光介质,无源Q开关材料和部分反射镜以及由聚焦透镜和单元组成的辅助谐振器。 本发明可以提高大功率常规激光器的效率; 因此,可以应用于二次谐波生成和非晶硅退火等高精度工业以及需要高度重复激光的精密工业中,因为能够提供具有均匀图案和高方向性的激光束。