公开(公告)号：US3976957A

公开(公告)日：1976-08-24

申请号：US576004

申请日：1975-05-09

申请人： Albert Le Floch ,  Guy Stephan

发明人： Albert Le Floch ,  Guy Stephan

IPC分类号： G02F1/09 ,  H01S3/137 ,  H01S3/139 ,  H01S3/13

CPC分类号： H01S3/137 ,  G02F1/092 ,  H01S3/1398

摘要： In a method for stabilizing the frequency of the stimulated radiation emitted by a laser, the radiation is subjected to a first rotation of its direction of polarization by applying a magnetic field to a material which exhibits the phenomenon of magnetic rotatory polarization and is placed in a two-mirror resonator. Anisotropic losses are introduced in the resonator so as to produce a second rotation of the direction of polarization, part of the radiation contained in the resonator is extracted and its direction of polarization D is measured. The direction D is held in a reference direction D.sub.O by measuring the difference between the two directions, by reducing this difference to zero and by modifying the value of the resonant frequency of the resonator.

摘要翻译： 在用于稳定由激光器发射的受激辐射的频率的方法中，通过对表现出旋转极化现象的材料施加磁场并将辐射放置在其中，使辐射经受其偏振方向的第一旋转 双镜面谐振器。 在谐振器中引入各向异性损耗以产生偏振方向的第二旋转，提取包含在谐振器中的部分辐射，并测量其偏振方向D. 通过测量两个方向之间的差异，通过将该差减小到零并通过修改谐振器的谐振频率的值来将方向D保持在参考方向DO。

公开(公告)号：US11355087B2

公开(公告)日：2022-06-07

申请号：US16764737

申请日：2018-08-03

申请人： Université de Rennes 1 ,  Albert Le Floch

发明人： Albert Le Floch ,  Guy Ropars

IPC分类号： G09G5/30 ,  G09B17/00

摘要： A method for displaying graphical content in a playback device (DISP), the graphical content being displayed and erased periodically on the display device according to successive cycles that take place at a predetermined frequency (Fd) and in that the successive display periods each have a duration (T1) comprised in an interval of values ranging from 15 to 30% of the duration (T) of the cycles that have taken place.

公开(公告)号：US11604361B2

公开(公告)日：2023-03-14

申请号：US16765278

申请日：2018-08-03

申请人： UNIVERSITÉ DE RENNES 1 ,  Albert Le Floch

发明人： Albert Le Floch ,  Guy Ropars

IPC分类号： G02B27/02 ,  G02C7/10 ,  G02C7/12

摘要： The invention relates to an optical device (FILT) for filtering light received, by polarisation or mechanically, from a medium presenting a graphic and/or textual content, characterized in that cycles of opening and closing a vision space, in a visible light spectrum, are realized periodically using the optical device (FILT) at a preset frequency Fd and in that the successive open periods each have a duration (T1) comprised in an interval of values ranging from 15 to 35% of the duration (T) of the realized cycles.

公开(公告)号：US20190159324A1

公开(公告)日：2019-05-23

申请号：US15883233

申请日：2018-01-30

申请人： Albert Le Floch ,  Université de Rennes 1

发明人： Albert Le Floch ,  Guy Ropars

IPC分类号： H05B37/02 ,  A61B5/16

摘要： The invention relates to a lighting device (LIGHT) of a graphic and/or textual content represented on any support and in particular of the paper type, characterized in that a light beam generated in a visible light spectrum is activated and periodically deactivated from the lighting device (LIGHT) according to successive cycles operated at a predetermined frequency (Fd) and in that the successive illumination periods each have a duration (T1) within a range of values from 15 to 30% of the duration (T) of the operated cycles.

公开(公告)号：US11134550B2

公开(公告)日：2021-09-28

申请号：US16765085

申请日：2018-08-03

申请人： Université de Rennes 1 ,  Albert Le Floch

发明人： Albert Le Floch ,  Guy Ropars

IPC分类号： H05B45/37 ,  H05B47/16 ,  H05B45/305 ,  G02B27/02 ,  A61B5/16 ,  F21Y115/10

摘要： The invention relates to a device (LIGHT) for lighting a graphic and/or textual content present on any medium and in particular on a paper medium. The lighting device (LIGHT) is configured to periodically activate and deactivate said lighting beam in successive cycles carried out at a preset frequency Fd. Each cycle has a duration T and comprises a period of activation of the light beam of duration T1 followed by a period of deactivation of the light beam of duration T2 or vice versa. The frequency Fd is comprised in an interval of values ranging from 60 to 90 Hz and the duration T1 of the periods of activation of the light beam is comprised in an interval of values ranging from 15 to 30% of the duration T of the cycles.

公开(公告)号：US5091912A

公开(公告)日：1992-02-25

申请号：US653636

申请日：1991-02-12

申请人： Fabien Bretenaker ,  Albert Le Floch

发明人： Fabien Bretenaker ,  Albert Le Floch

IPC分类号： H01S3/08 ,  H01S3/106 ,  H01S3/137 ,  H01S3/139

CPC分类号： H01S3/137 ,  H01S3/106 ,  H01S3/1396 ,  H01S3/08054 ,  H01S3/0809

摘要： A laser for use in all fields of measurement using a heterodyne effect delivers two waves at different frequencies, having mutually orthogonal linear polarizations. It comprises a lasing medium placed in a laser resonating cavity defined by mirrors and a birefringent crystal placed on the path of the two waves. The lasing medium is located in the resonating cavity in a zone where the two waves are separated spatially. Two quarter wave plates, one of which has neutral lines at substantially 45.degree. from the polarization axes of the birefringent means, are placed in the common path of the two waves so as to give a helical polarization to the two waves between the plates.

摘要翻译： 在使用外差效应的所有测量领域中使用的激光器以不同的频率提供具有相互正交的线性偏振的两个波。 它包括放置在由反射镜限定的激光谐振腔中的激光介质和放置在两个波的路径上的双折射晶体。 激光介质位于两个波在空间上分离的区域中的谐振腔中。 其中一个具有与双折射装置的偏振轴大致45度的中性线的两个四分之一波片被放置在两个波的共同路径中，从而给板之间的两个波形提供螺旋偏振。

公开(公告)号：US4305046A

公开(公告)日：1981-12-08

申请号：US54908

申请日：1979-07-05

申请人： Albert Le Floch ,  Roger Le Naour

发明人： Albert Le Floch ,  Roger Le Naour

IPC分类号： G02B27/28 ,  H01S3/083 ,  H01S3/098 ,  H01S3/13 ,  H01S3/08

CPC分类号： H01S3/08036 ,  G02B27/288 ,  H01S3/083 ,  H01S3/13

摘要： Selective optical resonator comprising at least two mirrors and a selective means disposed between two of these mirrors, said means being constituted by:an at least partial linear polarization means for the light in a direction P,a first birefringent plate having two neutral lines, one forming an angle .alpha..sub.1 =0 with direction P,an optically active substance having a birefringence with dispersion and which rotates the light polarization direction by an angle .theta. dependent on the wavelength of the .lambda. light,a second plate which is identical to the first having two neutral lines, one forming the angle .alpha..sub.2 =.theta. with the direction P, whereby the resonator is then selective for said wavelength .lambda..

摘要翻译： 选择性光学谐振器包括至少两个反射镜和设置在这些反射镜中的两个之间的选择性装置，所述装置由以下部分构成：用于沿方向P的光的至少部分线性偏振装置，具有两根中性线的第一双折射板， 与方向P形成角度α1 = 0，具有色散双折射并使光偏振方向旋转取决于λ光波长的角度θ的光学活性物质，与第一板的第一板相同的第二板 两个中性线，一个与方向P形成角度α2 =θ，从而谐振器然后对于所述波长λ是选择性的。