A Bessel Beam is a special kind of Non-diffracting beam that has a large depth of focus compared to a single mode Gaussian beam.

Holo/Or's DeepCleave module, which can be integrated into with existing laser systems, offers better performance compared to a single axicon Bessel beam generator, by creating a modified Bessel beam with an increased focal depth that is flat-top along the focal axis, unlike a standard Bessel Beam.

Holo/Or has many years of experience with Bessel Beam generation – we have a wide selection of single element Diffractive Axicon lenses, suitable for accurate, aberration free Bessel beam formation. We have also developed a more optimized focal shaping solution based on special Bessel-like beams, our DeepCleave glass cutting Module. This Module combines the performance of a High NA laser objective and a special Bessel beam DOF element, to achieve a Flat-Top focal region with very little energy outside the focal depth range. This makes it a more efficient solution compared to standard, single element Diffractive Axicons that generate a standard Bessel beam.

Analytically, the focal length is described by the lens maker's equation: 1/f = (n - 1)(1/R1 + 1/R2), where R1 and R2 are the radii of curvature, f is the focal ...

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After some Google research I found out that the white dot indicates the 28mm focal length and that there just wasn't enough room for "28" on the lens barrel.

Holo/Or's DeepCleave module, which can be integrated into with existing laser systems, offers better performance compared to a single axicon Bessel beam generator, by creating a modified Bessel beam with an increased focal depth that is flat-top along the focal axis, unlike a standard Bessel Beam.

An Axicon, also known as an Axicon lens to the optics community, refers to a family of optics often used to transform laser beams into Bessel-like beams, a family of nondiffracting beams with interesting and useful characteristics. Bessel beams, when focused by an external lens, create a region of elongated focus that has the same diffraction limited spot size as the lens, but can be many multiples of the Rayleigh Range. This allows one to bypass the built-in limit on the depth of focus of lenses, where the tighter one focuses the shorter the Depth of Focus (DOF) becomes.

Gaussian beam

Axicon Bessel beams are used in a variety of laser applications, where the focus media is transparent at the laser wavelength. One such field is laser glass cutting, often done with single mode ultrashort pulse lasers in the IR and green wavelengths. Glasses that must be cut are often 0.3-1.5mm thick, and process energy density often requires the laser to be tightly focused to spots of <10μm over the entire glass depth. This can only be achieved by two methods – mechanically moving the write head, thus reducing cut speed, or increasing the DOF using Bessel Beams. The Bessel Beam method is preferable both in throughput and reliability aspects, as it has no moving parts in Z direction.

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Bessel beam

The other type of axicon lens Bessel Beam generators are Diffractive Axicons. Diffractive Axicons are flat windows with a micron-deep etched pattern on their surface that generate the same function as a refractive axicon for the design wavelength. They have several advantages compared to the refractive option:

Another application for Bessel beams is in Light sheet fluorescent microscopy, where a large DOF Gaussian Bessel beam is scanned over the sample, creating a light sheet that can detect fluorescent-bound particles or cells that are flowing in a microfluidics channel. This method enables high resolution and flow rates, while maintaining good accuracy.

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Axicon

Bessel Beams are used for applications such as Laser Glass cutting and light-sheet fluorescent microscopy, to obtain large depth of focus and enable cutting of thick glass or measuring a large volume/ area.

There are generally two types of Bessel Beams generator: refractive Axicons and Diffractive Axicons. Refractive axicons are Glass cones that are ground at a certain angle. While simple and affordable, the grinding production process imposes severe limits to their usefulness as Bessel beam generators:

One of the factors that go into designing an objective lens is the magnification. The colored bands on the outside of the microscope indicate the magnification of the lens. The standard magnification bands are as follows: red band = 5x, yellow = 10x, green = 20x, blue = 40-60x, white = 100x. Thus, if a lens has a green and yellow band, the magnification would be 30x.

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A Bessel Beam is a special kind of Non-diffracting beam that has a large depth of focus compared to a single mode Gaussian beam.

Another factor to consider in designing an objective lens is the working distance (WD). This is defined to be the distance from the front of the objective to the sample when in sharp focus. Working distance is related to the numerical aperture (NA) which is calculated by the formula NA = n * sin(θa), where n is the index of refraction. When in air, n = 1. To obtain a greater refractive index and increase the numerical aperture, sometimes the objective is immersed in a liquid such as oil or water. While aberration, magnification, working distance, and numerical aperture are not the only variables to consider when designing a microscope, they are key characteristics that one should look for.

Bessel Beams are used for applications such as Laser Glass cutting and light-sheet fluorescent microscopy, to obtain large depth of focus and enable cutting of thick glass or measuring a large volume/ area.

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Microscope objective lenses are a classic example of optics in our lives. The function of the microscope is to enlarge objects our eyes cannot see. Unlike telescopes which enlarge far away objects, the sample observed by the microscope is close to the lens. Microscopes also correct aberration, which otherwise would lead to blurry images. Achromatic (doublet) lenses only correct for aberration of two wavelengths of light whereas apochromatic (triplet) lenses correct for 3 or more wavelengths.

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