Acta Photonica Sinica, Volume. 49, Issue 2, 0222001(2020)
Design and Experiments of Annular Beam Shaping Device with Low Speckle Noise
A design method of diffractive element that can effectively suppress speckle noise is proposed. Based on the traditional Gerchberg-Saxton algorithm, the uniformity of the light spot is effectively improved without reducing the diffraction efficiency by selecting a special initial phase. Taking the Gaussian beam shaped into an annular flat-top beam as an example, numerical simulation and optical experiments are carried out. The results show that the speckle contrasts of the annular flat-top beams obtained by using the proposed method and the traditional Gerchberg-Saxton algorithm are 11% and 34%, respectively, which verifies the proposed method can obtain a annular flat-top beam with low speckle noise.
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Wen-jing LIU, Hui PANG, A-xiu CAO, Li-fang SHI, Yong-qi FU, Qi-ling DENG. Design and Experiments of Annular Beam Shaping Device with Low Speckle Noise[J]. Acta Photonica Sinica, 2020, 49(2): 0222001
Received: Oct. 18, 2019
Accepted: Dec. 4, 2019
Published Online: Mar. 19, 2020
The Author Email: PANG Hui (wuli041@126.com)