Znse lens

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znse lens

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znse lens

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ZnSe Lenses

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znse lens

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However, you can change your cookie settings at any time. Zinc Selenide is one of the materials of choice for CO 2 laser optics operating at Open source for use with acknowledgement. To download this data or our MSDS safety data sheet as a pdf, please click on the links at the top of the page. To expand the transmission graphs, please click on the image. Zinc Selenide is produced by synthesis from Zinc vapour and H 2 Se gas, forming as sheets on Graphite susceptors.

Zinc Selenide is microcrystalline in structure, the grain size being controlled to produce maximum strength. Single crystal ZnSe is available, but is not common but has been reported as having lower absorption and thus more effective for CO 2 optics.

Polycrystalline To download this data or our MSDS safety data sheet as a pdf, please click on the links at the top of the page. Find out moreChoose products to compare anywhere you see 'Add to Compare' or 'Compare' options displayed. Optical Post Assemblies 0. Optical Pedestal Assemblies 1. Optical Post Assemblies 1.

Zinc Selenide lenses are an excellent choice of materials for IR lenses for application between nm to 16 microns wavelengths. Collimating a point light source coming from the planar surface or focusing a collimated light source which is incident on the curved surface will help to minimize the spherical aberration. Plano-Convex lenses are the best choice for focusing parallel rays of light to a single point. They can be used to focus, collect and collimate light.

The asymmetry of this lens shape minimizes spherical aberration in situations where the object and image are located at unequal distance from the lens. The optimum case is where the object is placed at infinity with parallel rays entering lens and the final image is a focused point. This Hene laser has a beam diameter of 0. Use LT-WR series spanner wrench for easy lens installation. Industrial Motion.

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ZnSe lenses are commonly used as collimators in biomedical and military applications. The lenses below are also particularly well suited for use with high-power CO 2 lasers. Additionally, they provide enough transmission in the visible region to allow the use of a red alignment beam.

Usage To minimize the introduction of spherical aberrations, light should be bent gradually as it propagates through the lens. Therefore, when using a plano-convex lens to focus a collimated light source, the collimated light should be incident on the curved surface. Similarly, when collimating a point source of light, the diverging light rays should be incident on the planar surface of the lens.

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When handling optics, one should always wear gloves. This is especially true when working with zinc selenide, as it is a hazardous material. For your safety, please follow all proper precautions, including wearing gloves when handling these lenses and thoroughly washing your hands afterward. Thorlabs will accept all ZnSe lenses back for proper disposal.

Please contact Tech Support to make arrangements for this service. The specifications to the right are measured data for Thorlabs' E3-coated ZnSe lenses.

ZnSe CO2 Laser Focus Lens

Damage threshold specifications are constant for all Thorlabs' E3-coated ZnSe lenses, regardless of the size or focal length of the lens. The following is a general overview of how laser induced damage thresholds are measured and how the values may be utilized in determining the appropriateness of an optic for a given application.

The LIDT for an optic greatly depends on the type of laser you are using. Continuous wave CW lasers typically cause damage from thermal effects absorption either in the coating or in the substrate. Pulsed lasers, on the other hand, often strip electrons from the lattice structure of an optic before causing thermal damage. Note that the guideline presented here assumes room temperature operation and optics in new condition i. Because dust or other particles on the surface of an optic can cause damage at lower thresholds, we recommend keeping surfaces clean and free of debris.

For more information on cleaning optics, please see our Optics Cleaning tutorial. The optic is exposed in 10 locations to this laser beam for 30 seconds CW or for a number of pulses pulse repetition frequency specified.

This process is repeated until damage is observed. A histogram such as that below represents the testing of one BB1-E02 mirror. According to the test, the damage threshold of the mirror was 2. Please keep in mind that these tests are performed on clean optics, as dirt and contamination can significantly lower the damage threshold of a component.

While the test results are only representative of one coating run, Thorlabs specifies damage threshold values that account for coating variances. When an optic is damaged by a continuous wave CW laser, it is usually due to the melting of the surface as a result of absorbing the laser's energy or damage to the optical coating antireflection [1].

Absorption is either due to an intrinsic property of the optic or due to surface irregularities; thus LIDT values are only valid for optics meeting or exceeding the surface quality specifications given by a manufacturer. While many optics can handle high power CW lasers, cemented e.

These lower thresholds are due to absorption or scattering in the cement or metal coating. LIDT in linear power density vs. For long pulses to CW, linear power density becomes a constant with spot size. This graph was obtained from [1]. Unfortunately, this is highly dependent on factors such as absorption and thermal diffusivity, so there is no reliable method for determining when a high PRF laser will damage an optic due to thermal effects.

For beams with a high PRF both the average and peak powers must be compared to the equivalent CW power. In order to use the specified CW damage threshold of an optic, it is necessary to know the following:.

Average linear power density can be calculated using the equation below. The calculation above assumes a uniform beam intensity profile. You must now consider hotspots in the beam or other non-uniform intensity profiles and roughly calculate a maximum power density.Raw material properties Only lasergrade ZnSe is used in the fabrication of lenses.

See section M1. Dimensions ZnSe lenses can be fabricated in diameters from 4. Price List Sections dealing with standard types are:- 4.

For special applications, non-standard sizes can be made to order. Focal length : Designed and fabricated within 0. Absorption : 0. This factor remains constant for a very wide range of laser powers. For any standard lens, the information indicated in Fig 4.

Refurbishment of used lenses See Technical Data Section 6. Thermal lensing is kept to a minimum by the use of Lasergrade ZnSe, smooth polished finish and low absorption coatings.

Zinc Selenide Plano-Convex Lenses, AR Coated: 7 - 12 µm

Plano-convex lenses Plano-convex lenses are generally inferior in performance to the optimum meniscus type for focusing a CO2 laser beam, although they may be less expensive in quantity requiring less raw material to manufacture.

Umicore Laser Optics offer as standard the superior meniscus type, usually made in quantity to reduce unit costs. Centre thickness is relevant to the lens design and focal length. Edge thickness is relevant to maximum assist gas pressures, and mounting arrangements. Where an enquiry states a thickness, but without other qualification, then this will be taken to refer to the lens centre thickness. Standard products The lenses listed below are designed for use at normal processing gas pressures.

Notes 4. Go to Top.Small, focused spot size is important for a couple of reasons: cutting, welding and heat treating generally call for high-power density, and power density is a strong function of spot size. Also, many jobs demand narrow kerf widths and heat affected zones, which can only be achieved with a tightly focused beam. The design variables that will affect the performance of a CO2 laser lens are: focal length, diameter, shape, material and coating.

Focal length affects both spot size and depth of focus. In general, a shorter focal length will produce a smaller focused spot and a shorter depth of focus. Usually, the specified focal length is a compromise between desired spot size, penetration depth and workpiece clearance. Higher power lasers require larger diameter lenses to prevent thermal overload. At any given focal length, a larger diameter lens will yield a smaller focused spot if the incoming beam is expanded to fill the larger lens.

Plano-convex is the simplest and least expensive lens shape. It is used in such applications as welding where achieving the smallest spot size is not critical, or at relatively long focal lengths when more complex shapes would not be beneficial.

A plano-convex lens should be oriented with the flat side toward the workpiece and the convex side toward the laser. Meniscus lenses have a concave curve on one side and a convex curve on the other.

At relatively short focal lengths, a meniscus lens will yield a smaller focused spot than a plano-convex lens.

Zinc Selenide Lenses

However, meniscus lenses are more expensive to manufacture than plano-convex lenses because both sides are curved. A meniscus lens should be oriented with the concave curve toward the workpiece. Zinc Selenide ZnSe has the lowest absorption of the common CO2 transmitting materials and is, therefore, the material of choice for high-power applications.

It is also the only material that transmits visible light, a requirement for the use of a HeNe alignment laser. Gallium Arsenide GaAs is the material of choice in dirty or high- splatter environments.

It has relatively high hardness which helps repel debris particles. It also has high thermal conductivity which helps transmit heat away from imbedded particles. Germanium Ge can only be used in low power applications because it is subject to thermal runaway. As temperature increases, its absorption increases, which leads to thermal failure in high power applications.

Ge used to be the lowest cost CO2 lens material because its widespread use in the semiconductor industry created a large supply. However, the demand for ZnSe for high power laser applications has increased the supply of ZnSe so greatly that Ge is not always the least expensive lens material. When high pressure assist gases are employed to increase laser cutting speeds, extra thick lenses must be used to prevent lens distortion or breakage.

ZnSe is the preferred substrate material for extra thick lenses because most applications requiring high pressure assist gas also require high laser power.

Focal Length Focal length affects both spot size and depth of focus.If you continue to use our services, we will assume that you agree to the use of such cookies. Zinc selenide ZnSe is the most popular material for infrared applications. Due to a very wide transmission range covering 0. Limited quantity is available in US warehouse for express delivery. For details please write to sales.

About Us Go back. About Us Catalogues News. Your cart. There are no items in your cart. Add items to your cart and request an official quote or order online. Print my shopping cart. Products categories. Go back. Zinc Selenide ZnSe Lenses. Choose product Send request for custom product.

Express delivery Limited quantity is available in US warehouse for express delivery. Low absorption in the red end of the visible spectrum Not hygroscopic Quite stable in the laboratory environment Zinc selenide ZnSe is the most popular material for infrared applications. Large Aperture Optical Mount T. Variable Lens Holder Eksma Optics.

15 watt co2 laser with ZnSe lens , handheld kinda :P

I agree with Privacy policy. All rights reserved. External Transmission of ZnSe lens of 10 mm thickness. Request Express delivery Limited quantity is available in US warehouse for express delivery.


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