Abstract
Axicon is an optical element that can be used to produce high-quality Bessel beams efficiently. In general, the smaller the base angle of the axicon is, the longer the diffraction-free distance of the generated Bessel beam will be. Therefore, axicon with an extremely small base angle is important for the generation of Bessel beam. However, the measurement of an extremely small base angle is a challenge. Here, we applied the phase-shifting digital holography in the measurement of axicon angle. The errors of the three measured axicons with base angles of 0.5°, 1°, and 1° were 1.94%, 4.43%, and 1.63%, respectively.
Highlights
As proposed by Durnin [1], Bessel beams have been receiving much attention because of their interesting properties
Bessel beams are involved in the applications in strong-field science, laser machining, biomedical imaging, and confocal microscopy [10,11,12,13,14,15,16]
We introduced digital holography to measure the base angle of an axicon
Summary
As proposed by Durnin [1], Bessel beams have been receiving much attention because of their interesting properties. Bessel beams have long diffraction-free distance and can reconstruct in the presence of an obstacle (self-reconstructing) [2,3,4,5] Such properties make Bessel beams attractive for a broad range of applications, such as optical tweezers and particle trapping [6,7,8,9]. Given the specific properties and important applications, the generation of Bessel beams is of considerable importance Several techniques such as diffractive optical element, spatial light modulator (SLM), and axicon, have been used to generate Bessel beams [17,18,19,20,21]. The smaller the base angle of the axicon is, the longer the diffraction-free distance of the generated Bessel beam will be [22]. Results show that this method can precisely detect the extremely small base angle of an axicon
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