1. University of Oulu, Optoelectronics and Measurement Techniques Laboratory, P.O. Box 4500, Oulu 90014, Finland
2. National Yang-Ming University, Biophotonics and Molecular Imaging Research Center, Taipei 11221, Taiwan
3. University of Oulu, Optoelectronics and Measurement Techniques Laboratory, P.O. Box 4500, Oulu 90014, FinlandcSaratov State University, Research-Educational Institute of Optics and Biophotonics, Saratov 410012, RussiadInstitute of Precise Mechanics and Co