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    • 1. 发明申请
    • WAVELENGTH DETECTOR, WAVELENGTH STABILIZATION LASER DEVICE, AND IMAGE DISPLAY DEVICE
    • 波长检测器,波长稳定激光器件和图像显示器件
    • US20080225911A1
    • 2008-09-18
    • US12048561
    • 2008-03-14
    • Kenji NAKAYAMAShinichi Kadowaki
    • Kenji NAKAYAMAShinichi Kadowaki
    • H01S3/13G01J3/45
    • G01J1/4228G01J1/04G01J1/0407G01J1/0437G01J1/0448G01J9/00G02F1/1336H01S5/0687
    • A wavelength detector capable of distinguishing between the changes of a transverse mode and of a longitudinal mode of a laser light and thus detecting the change of the wavelength of the laser light with high accuracy is provided. In a wavelength detector 13: a diffraction grating 16 diffracts a laser light emerging from a laser light source 10; photodetectors 50a and 50b are positioned symmetrically with respect to a 0-order diffracted light diffracted by the diffraction grating 16; and light incidence surfaces 51a and 51b of the photodetectors 50a and 50b, respectively, have the same shape and are each divided into a plurality of areas. The wavelength detector 13 detects the change of the wavelength of the laser light based on a value obtained by dividing the difference value between the sum of light intensities measured by all of the plurality of divided areas of the photodetector 50a and the sum of light intensities measured by all of the plurality of divided areas of the photodetector 50b, by the sum of light intensities measured by all of the plurality of divided areas of the two photodetectors 50a and 50b.
    • 提供能够区分横模的变化和激光的纵向模式并因此以高精度检测激光的波长的变化的波长检测器。 在波长检测器13中:衍射光栅16衍射从激光光源10出射的激光; 光电检测器50a和50b相对于由衍射光栅16衍射的0级衍射光对称地定位; 并且光电检测器50a和50b的光入射表面51a和51b分别具有相同的形状并且被分成多个区域。 波长检测器13基于通过将由光检测器50a的所有多个分割区域测量的光强度的总和与测量的光强度之和之间的差值除以获得的值来检测激光的波长的变化 由光检测器50b的多个分割区域的全部由两个光电检测器50a和50b的所有多个分割区域测量的光强度的总和。
    • 7. 发明授权
    • Wavelength detector, wavelength stabilization laser device, and image display device
    • 波长检测器,波长稳定激光装置和图像显示装置
    • US07630426B2
    • 2009-12-08
    • US12048561
    • 2008-03-14
    • Kenji NakayamaShinichi Kadowaki
    • Kenji NakayamaShinichi Kadowaki
    • H01S3/08
    • G01J1/4228G01J1/04G01J1/0407G01J1/0437G01J1/0448G01J9/00G02F1/1336H01S5/0687
    • A wavelength detector detecting a change of a wavelength of a laser light with high accuracy, such that the wavelength detector includes a diffraction grating diffracting a laser light, photodetectors positioned symmetrically with respect to a 0-order diffracted light diffracted by the diffraction grating, and respective light incidence surfaces of the photodetectors that have a same shape and that are divided into a plurality of areas. The wavelength detector detects the change of the wavelength based on a value obtained by dividing a difference between (i) a sum of light intensities measured by all of the plurality of divided areas of a first photodetector and (ii) a sum of light intensities measured by all of the plurality of divided areas of a second photodetector, by a sum of light intensities measured by all of the plurality of divided areas of both photodetectors.
    • 波长检测器以高精度检测激光的波长变化,使得波长检测器包括衍射激光的衍射光栅,相对于由衍射光栅衍射的0级衍射光对称定位的光电检测器,以及 具有相同形状且被分成多个区域的光电检测器的各个光入射面。 波长检测器基于通过划分(i)由第一光电检测器的所有多个分割区域测量的光强度的总和和(ii)测量的光强度的总和之间的差异而获得的值来检测波长的变化 通过由两个光电检测器的所有多个分割区域测量的光强度的总和,由第二光电检测器的多个分割区域的全部。