发明名称 |
MODAL DECOMPOSITION OF A LASER BEAM |
摘要 |
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. |
申请公布号 |
WO2014064636(A3) |
申请公布日期 |
2014.07.24 |
申请号 |
WO2013IB59611 |
申请日期 |
2013.10.24 |
申请人 |
CSIR |
发明人 |
FORBES, ANDREW;SCHULZE, CHRISTIAN;DUPARRÉ, MICHAEL RUDOLF;NGCOBO, SANDILE |
分类号 |
H01S3/00;G01J9/00 |
主分类号 |
H01S3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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