Ralf G. Niemann

4 Questions 7 Answers 0 Followers

Questions related from Ralf G. Niemann

How to remove a titanium (Ti) layer from a LaSFN9 optical glass substrate? - without etching the glass?

I have optical glass substrates (LaSFN9) that have a 2nm Ti contact layer and 50nm Au layer, those need to be cleaned. The gold comes easily off with a solution of I2 and KI in water. The Ti is...

05 May 2016 1,664 2 View

Is there a dependence of light absorption due to particle size, especially if the absorbing particles are in the range of the light-wavelength?

The sintering of particles with a size of a few µm with a 1064 nm laser shows unpredictable results, there is either no reaction or evaporation and ablation of material. My suggestion is that I...

08 August 2012 8,044 1 View

Is there a dependence of particle size on light absorption, especially if the light-wavelength is in the range of the particle size?

The sintering of particles with a size of a few µm with a 1064 nm laser shows unpredictable results, there is either no reaction or evaporation and ablation of material. My suggestion is that I...

08 August 2012 3,096 16 View

Why are plants green?

And I do not mean the biochemical answer! Sure, plants are green because their cells contain chloroplasts which have the pigment chlorophyll which absorbs deep-blue and red light, so that the rest...

08 August 2012 2,055 94 View