The condition of minimum deviation (MD) by a transparent optically isotropic prism is re-derived, and expressions for the intensity transmittances Tp(θ) and Ts(θ) of an uncoated prism of refractive index n and prism angle α for incident p- and s-polarized light and their derivatives with respect to the internal angle of refraction θ are obtained. When the MD condition (θ=α/2) is satisfied, Ts is maximum and Tp is maximum or minimum. The transmission ellipsometric parameters ψt,Δt of a symmetrically coated prism are also shown to be locally stationary with respect to θ at θ=α/2. The constraint on (n,α) for maximally flat transmittance (MFT) of p-polarized light at and near the MD condition is determined. The transmittance Tp of prisms represented by points that lie below the locus (n,α) of MFT exhibits oscillation as a function of θ. No similar behavior is found for the s polarization. Magnitudes and angular positions of the maxima and minima of the oscillatory Tp-versus-θ curves are also calculated as functions of α for a ZnS prism of refractive index n=2.35 in the visible.

Polarization oflightnotes PDF

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Linearlypolarized light

That looks like it’s made to ride on some kind of V rail with those rollers on the back side. Wouldn’t mount to his linear rail block. ??

Difference betweens and p polarized light

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Planepolarized light

The lens getting damaged is one of the drawbacks of the design. The Beam Buddy high resolution laser head I sell does not flat pack the lenses like Russ’s, and uses custom manufactured USA ZnSe AR coated meniscus lenses that have an air gap between them in a solid aluminum housing. The lenses are rated for 150W power handling and stay very cool with the air assist on and the air gap between lenses.

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S-polarizedlight

Have you taken the head off to see how your round tube is attached to the bottom of the block? Possible to maybe just replace the tube? What’s the bottom side look like?

Ellipticallypolarized light

Like the HeNe laser, these gas lasers are typically pumped by a high-voltage dc electric discharge directed down the bore of a gas-filled tube. However, the ...

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The condition of minimum deviation (MD) by a transparent optically isotropic prism is re-derived, and expressions for the intensity transmittances Tp(θ) and Ts(θ) of an uncoated prism of refractive index n and prism angle α for incident p- and s-polarized light and their derivatives with respect to the internal angle of refraction θ are obtained. When the MD condition (θ=α/2) is satisfied, Ts is maximum and Tp is maximum or minimum. The transmission ellipsometric parameters ψt,Δt of a symmetrically coated prism are also shown to be locally stationary with respect to θ at θ=α/2. The constraint on (n,α) for maximally flat transmittance (MFT) of p-polarized light at and near the MD condition is determined. The transmittance Tp of prisms represented by points that lie below the locus (n,α) of MFT exhibits oscillation as a function of θ. No similar behavior is found for the s polarization. Magnitudes and angular positions of the maxima and minima of the oscillatory Tp-versus-θ curves are also calculated as functions of α for a ZnS prism of refractive index n=2.35 in the visible.

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S and p polarized lightformula

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Circularlypolarized light

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Our two head big Green Machine is due to arrive in Los Angeles Port from China Tuesday and with a bit of luck we should get it delivered in Portland 3.28. I am very interested in upgrading the engraving head so I’m doing research on the nozzles. Until your post @Grumpy_Old_Man I did not know that there was another option over the Russ/CloudRay upgrade.

I saw it on one of his videos, shortly after he installed the compound lens (which did give him excellent results) he noticed the focus abruptly changed badly. When he took the lens out to inspect, he saw that the lower lens had a large circular dark spot in its center that could not be cleaned. He guessed the beam power entering the second lens was just to much for the lens material to handle.

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Fresnel produced six sizes of lighthouse lenses, divided into orders based on their size and focal length. In modern use, these are classified as first through ...

My problem is I have 12 mm lens. HARD to find but I did, at Cloudray Laser and ordered a 12 mm CVD ZnSe meniscus lens, until I can find a new laser head that I can use. My laser head attaches different than most, it’s a Samger 80 watt. LightObject was no help at all, here is a picture picture20200318_1344023024×4032 2.29 MB anybody know of a replacement head I could use so I can get a larger lens?

“Meniscus lenses are designed to minimize spherical aberration producing a minimum focal spot size for incoming collimated light.”

I use ii-iv lenses exclusively in my lasers, and we have been using custom manufactured lenses from ii-vi infrared for the Beam Buddy high resolution laser heads that we sell. I can not speak highly enough about the quality of the i-vi lenses.

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I thought he had a problem with the lower lens being damaged by the reduced beam size from the first lens. Has that problem been solved?

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Have any of you guys tried Russ’s SarbarMultimedia compound lens system? Cloudray Compound Engraving Nozzle Set Lens Diameter 18mm 20mm with Compound lens for Laser Engraving Machine https://www.amazon.com/dp/B07KC58TDQ/ref=cm_sw_r_cp_tai_lxACEbR7RFSKH image2388×1523 824 KB image926×954 115 KB