Cylindrical lenses can gather or diffuse light in a single radial direction. Cylindrical mirrors are used in many manufacturing industries and industries, such as electron optics metrology, laser scanners, spectroscopy, laser diode output light shaping and beauty, and light sheet illumination microscope imaging, with versatility.
The output beam of a laser diode diverges in an asymmetric manner, making its collimation work more challenging. For example, for divergence angles θ 1x θ A diode light source with 2=10 ° x40 ° can only be collimated in one direction and diverges or converges in the other direction if a standard cylindrical mirror is used. Using a cylindrical mirror can decompose the problem into two one-dimensional directions. By combining two orthogonal cylindrical mirrors, both directions can be collimated simultaneously.
The selection of cylindrical mirrors and the construction of optical paths must follow the following rules:
In order to make the reconstructed light spot uniform and symmetrical, the focal length ratio of the two cylindrical mirrors should be approximately equal to the divergence angle ratio.
Laser diodes can be considered as point light sources. In order to obtain collimated output, the distance between two cylindrical mirrors and the light source is equal to the focal length of both.
The window lens processing manufacturer tells you that the distance between the main planes of two cylindrical mirrors should be equal to the difference in focal lengths between the two f2-f1 lenses, and the actual distance between the two lens surfaces should be equal to BFL2-BFL1. Like a spherical lens, the convex surface of a cylindrical mirror should face the collimated beam to greatly reduce aberration.
Due to the rapid divergence of the output beam of the laser diode, it is necessary to ensure that the size of the light spot on each cylindrical mirror does not exceed the effective aperture of the lens. Since the distance between the cylindrical mirror and the diode is equal to its focal length, it is necessary to follow the larger spot width at each cylindrical mirror position. The application of window chips and window chip processing is also increasing and gradually appearing in the public’s vision.