Research on the optical properties of an easy-to-prepare beveled fiber

Optical fiber has become a very important optical transmission medium due to its excellent anti-interference ability, longdistance transmission and low loss characteristics, which is widely used in signal transmission, remote sensing, optical imaging fields. In order to obtain the specific image spot shape and size, the research of optical output and imaging performance of fiber is gradually increasing. At present, common optical fibers have weak imaging regulation ability, most of the optical fiber imaging probes mainly use light regulation ability of photonic crystal fiber or add microlens on the fiber end face to realize the regulation of light output and imaging ability, which used to light collimate, light focus and control the wavelength of light. However, photonic crystal fibers have the disadvantages of difficult preparation, high equipment requirements and high cost, the method of adding microlens on the fiber end face will cause the probe to be oversize. Here, we propose a simple-fast and cost-effective preparation method for beveled fiber, which can be prepared by beveling and grinding simply. The beveled angle of fiber is closely related to the incident angle and exit angle of the light, different bevel angles will have a huge impact on the propagation path of light and lead to different degrees of total internal reflection of light on the end face of fiber, which will ultimately affect the shape of image spot. The imaging performance of fiber is simulated and analyzed by Zemax software, results show that the shape of image can be control by changing the beveled angle of fiber end face. The experiments show that the actual effect of beveled fiber is consistent with the simulation results, specific imaging requirements can be met by optimizing beveled angle, which is expected to be combined with optical elements to build a compact optical path.