What does the excellent use of cylindrical Lenses have?
Cylindrical lenses can gather or emit light in a single radial direction, and it has been widely used in several manufacturing industries and industries, such as electronic optical metrology verification, laser scanner, spectroscopy, laser diode output light plastic surgery, and microscope imaging of optical lighting lamps.
The collimating light source is formed into a linear light source
This is the most widely used Cylindrical lenses.As shown in the figure below, a collimating light source with radius r0 is shot into a plano-concave cylindrical lens with focal length of -f (the picture enlarges the beam radius to illustrate the principle more clearly).The beam diverges in half theta (theta =r0/f).At this point, it can also be approximately regarded as the divergence of the point source at the focal point -f.
Collimation of diode output beam
Laser diode output beam diverge in asymmetric form, so its collimation is challenging.For example, for a diode light source that diverges theta 1x theta 2=10°x40°, if only standard spherical lenses are used, colation can only occur in one direction and divergence or convergence in the other.The problem can be decomposed into two one-dimensional directions by using cylindrical mirrors, and collimation in both directions can be achieved by combining two orthogonal cylindrical mirrors.
The selection and construction of cylindrical lenses must follow the following rules:
1) the focal length ratio of two cylindrical lenses should be approximately equal to the ratio of divergence Angle in order to ensure uniform and symmetrical light spots after shaping.
2) the laser diode can be approximately regarded as a point light source. In order to obtain collimation output, the distance between the two cylindrical mirrors and the light source is equal to the focal length of the two respectively.
3) the distance between the two cylindrical lenses on the main plane should be equal to the difference in focal lengths of f2 -- f1, while the actual distance between the two lenses' surfaces is equal to BFL2 -- BFL1.Like a spherical lens, the convex surface of a cylindrical lenses should be oriented toward the collimating beam to minimize aberrations.
4) because the laser diode output beam diverts rapidly, we need to pay attention to ensure that the size of the light spot on each cylindrical lenses is not beyond the effective light transmission aperture of the lens.Since the distance from the cylindrical lenses to the diode is equal to its focal length, the maximum spot width of each cylindrical lenses position should be followed
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