Recently, the method of multipoint interferometer (MI) was proposed to detect the orbital angular momentum (OAM), which could be used for measuring OAM of light from astronomical sources. However, this method is limit to low topological charge, because the interference pattern can repeat periodically. In order to solve this problem, we proposed an improved multipoint interferometer method (IMI) capable of measuring the OAM of optical vortex with arbitrary topological charge. However, the method of IMI is limited by complex interference patterns detection difficult. To overcome these disadvantages of MI and IMI, we proposed a method called DRI using screen plate with a binary ring slit and two pinholes. This method is demonstrated viability theoretically
A new type of direct transmission visibility measuring device is developed. The device can obtain the visibility by measuring the atmosphere transmittance ratio of laser beam in sampling space. The measuring principle and the design scheme of the device are described. The measuring comparison experiments of this device and the reference transmittance meter are carried out. The experiment results verify the correction of test theory and technique scheme. The relative measurement error is under 20% within the test range of 10 km.
A experimental method measuring laser energy and energy distributing of large-aperture beam is presented. The experimental equipment is established. The energy and energy distribution of beam, the beam size is Φ100mm and Φ360mm, are measured. The result show measuring error for laser energy is less than 8%. The energy distribution is basically consistent.
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