公开(公告)号：WO2014064636A2

公开(公告)日：2014-05-01

申请号：PCT/IB2013/059611

申请日：2013-10-24

Applicant: CSIR

Inventor： FORBES, Andrew ,  SCHULZE, Christian ,  DUPARRÉ, Michael Rudolf ,  NGCOBO, Sandile

IPC: H01S3/00

CPC classification number: G01J1/4257 ,  G01J1/0407 ,  G01J1/0411 ,  G01J1/0437 ,  G01J1/4228 ,  G01J9/00 ,  G01J2009/004 ,  H01S3/0014 ,  H01S3/005 ,  H01S3/08054 ,  H01S3/0815 ,  H01S3/09415

Abstract: A method and apparatus for performing a modal decomposition of a laser beam are disclosed. The method includes the steps of performing a measurement to determine the second moment beam size (w) and beam propagation factor (M2) of the laser beam, and inferring the scale factor (wO) of the optimal basis set of the laser beam from the second moment beam size and the beam propagation factor, from the relationship: wO = w/M2. An optimal decomposition is performing using the scale factor wO to obtain an optimal mode set of adapted size. The apparatus includes a spatial light modulator arranged for complex amplitude modulation of an incident laser beam, and imaging means arranged to direct the incident laser beam onto the spatial light modulator. A Fourier transforming lens is arranged to receive a laser beam reflected from the spatial light modulator. A detector is placed a distance of one focal length away from the Fourier transforming lens for monitoring a diffraction pattern of the laser beam reflected from the spatial light modulator and passing through the Fourier transforming lens. The apparatus performs an optical Fourier transform on the laser beam reflected from the spatial light modulator and determines the phases of unknown modes of the laser beam, to perform a modal decomposition of the laser beam.

Abstract translation: 公开了一种用于执行激光束的模态分解的方法和设备。 该方法包括以下步骤：执行测量以确定激光束的第二矩光束尺寸（w）和光束传播因子（M2），并且从激光束的最佳基组集合中推断最优基础集合的比例因子（w0） 第二时刻光束大小和光束传播因子的关系：w0 = w / M2。 使用比例因子wO执行最优分解以获得适应大小的最优模式集合。 该设备包括布置成用于对入射激光束进行复合幅度调制的空间光调制器以及布置成将入射激光束引导到空间光调制器上的成像装置。 傅里叶变换透镜被布置成接收从空间光调制器反射的激光束。 检测器被放置在离傅里叶变换透镜一焦距的距离处，以监测从空间光调制器反射并穿过傅里叶变换透镜的激光束的衍射图案。 该设备对从空间光调制器反射的激光束执行光傅立叶变换，并确定激光束的未知模式的相位，以执行激光束的模态分解。

公开(公告)号：WO2010125534A1

公开(公告)日：2010-11-04

申请号：PCT/IB2010/051880

申请日：2010-04-29

Applicant: CSIR ,  LITVIN, Ihar, Anatolievich ,  FORBES, Andrew

Inventor： LITVIN, Ihar, Anatolievich ,  FORBES, Andrew

IPC: H01S3/08 ,  H01S3/106

CPC classification number: H01S3/08045 ,  H01S3/08 ,  H01S3/106 ,  H01S2301/206

Abstract: The invention relates to an optical resonator, laser apparatus and a method of generating a laser beam inside an optical resonator. The optical resonator (10) includes an optical cavity (12) and an optical element (104.1, 104.2) at either end thereof, operable to sustain a light beam (108) therein, characterised in that each optical element (104.1, 104.2) is a phase-only optical element operable to alter a mode of the beam (108) as it propagates along the length of the optical resonator (10), such that in use the beam (108) at one end of the optical resonator (10) has a Gaussian profile while the beam (108) at the other end of the optical resonator (10) has a non-Gaussian profile.

Abstract translation: 本发明涉及光学谐振器，激光装置和在光学谐振器内部产生激光束的方法。 光学谐振器（10）在其任一端包括光学腔（12）和光学元件（104.1,104.2），可操作以在其中维持光束（108），其特征在于每个光学元件（104.1,104.2）是 一个仅相位光学元件，其可操作以在沿着光学谐振器（10）的长度传播时改变光束（108）的模式，使得在使用中在光学谐振器（10）的一端处的光束（108） 具有高斯分布，而在光学谐振器（10）的另一端的光束（108）具有非高斯分布。

公开(公告)号：EP3332496A1

公开(公告)日：2018-06-13

申请号：EP16757969.7

申请日：2016-08-05

Applicant: University Of The Witwatersrand, Johannesburg ,  CSIR

Inventor： FORBES, Andrew ,  DUDLEY, Angela ,  GUZMÁN, Carmelo Guadalupe Rosales

IPC: H04J14/00 ,  H04J14/02 ,  H04J14/04

CPC classification number: H04J14/00 ,  H04J14/02 ,  H04J14/04

Abstract: The invention relates to optical communication methods and systems. In particular, the invention relates to an optical communication method and system which is configured to create a multiplexed beam from an incident beam, wherein the multiplexed beam comprises a predetermined number of spatial modes simultaneously generated and multiplexed together in a fashion that is independent of wavelength. The spatial modes have two degrees of spatial freedom. The multiplexed beam is de-multiplexed downstream from multiplexing thereof in the communication system in a simultaneous fashion independent of wavelength to yield the predetermined number of spatial mode. The modes are used in optical communication as channels or as bits in a bit (de) encoding scheme.

公开(公告)号：EP2425505A1

公开(公告)日：2012-03-07

申请号：EP10720032.1

申请日：2010-04-29

Applicant: CSIR

Inventor： LITVIN, Ihar, Anatolievich ,  FORBES, Andrew

IPC: H01S3/08 ,  H01S3/106

CPC classification number: H01S3/08045 ,  H01S3/08 ,  H01S3/106 ,  H01S2301/206

Abstract: The invention relates to an optical resonator, laser apparatus and a method of generating a laser beam inside an optical resonator. The optical resonator (100) includes an optical cavity (102) and an optical element (104.1, 104.2) at either end thereof, operable to sustain a light beam (108) therein, characterized in that each optical element (104.1, 104.2) is a phase-only optical element operable to alter a mode of the beam (108) as it propagates along the length of the optical resonator (100), such that in use the beam (108) at one end of the optical resonator (100) has a Gaussian profile while the beam (108) at the other end of the optical resonator (100) has a non-Gaussian profile.