RDWorks Learning Lab 203 The Russ Theory of Laser Lenses Part1 @SarbarMultimedia

Uploaded March 2021 | Updated September 2026, 1 week ago

For about 2 years I have been wrestling with two major "truths" about lenses and laser beams that do not stand up to practical tests. The first was focal length/spot size/energy density. It is well documented that you need more watts to use a 4" lens because its energy density is low due to its larger spot size. That implies that shorter focal lengths with smaller spot sizes cut better with the same power. It was when I discovered this "truth" to be incorrect, that I began my quest to understand how lenses work. At the same time I noted that lens theory takes us as far as the focal point and then dumps us without explaining how it is possible to get a parallel cut BELOW the focal point ( and for very long distances) . After the focal point the beam is diverging and losing it damage capability so how is such material damage possible? It seems to be something that is taken for granted and never been researched.
My search for a long compound lens may have ended in failure but some of the data I collected during that search has accidently unlocked the answer to both the questions above.

RDWorks Learning Lab 203 The Russ Theory of Laser Lenses Part1

$Diode Lasers....Under the Hood 22 With 20 watts of power it should be possible to damage some types of metal ,so in this session I investigate which metals may be susceptible to 455nm wavelength light. With my beam analysis technique, I had already discovered that stainless steel would accept some of the light energy, thus the special oxidization propreties of stainless steel offered the potential for creating the range of oxidizing clours in a controlled manner. We see colours as combination of lightwaves that make up all the colours of the rainbow. When ALL the colours are present we see that as white and when NONE of the colours are present we perceive that as black. We are used to seeing colours as refelections from objects that absorb some of those rainbow wavelengths and reflect the remaining mix for our eye to respond to. That is what I will call pigment colour. There are two other types of colour that nature creates. One you can see in soap bubbles where the colours are created by a process called thin film interference. The second happens when light falls on a uniform micro machined surface (imagine a ploughed field at the molecular level). This causes white light to seperate into its constituent rainbow colors by a process called diffraction. However, depending on the manner and direction of the micro machining, you may see only some of those diffracted colours. This is the way in which nature colours butterfly wings, peacock feathers and beetle shells. Is a diode laser capable of recreating either of these of natural colouring techniques?? It is certainly not a pigment painter.$

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