Radioactive Laser Mirrors?
So that newly acquired laser set off your Geiger counter. No, it’s not a terrorist plot. 🙂 (From: Bob.) Many coatings use thorium. Thorium fluoride or oxyfluoride is fairly common. I am not familiar with the current technique of depositing such films. Thorium oxide, such as used in gas mantles, is one of the highest, if not the highest, temperature melting oxides. Wavelength Selective Filters For many optics applications, a specific range of wavelengths needs to be passed or blocked. For example, to eliminate unwanted lasing lines in the beam of a multiline laser, or to eliminate the 808 nm and 1,064 nm residual IR from a 532 nm (green) DPSS laser. There are two major classes of optical filters: • Bulk absorbing filters: These are made with a material that absorb ranges of wavelengths through their entire thickness. Colored glass or plastic are examples of this type of filter. A colorless base material has some type of dopant mixed in when it is manufactured.
So that newly acquired laser set off your Geiger counter. No, it’s not a terrorist plot. 🙂 (From: Bob.) Many coatings use thorium. Thorium fluoride or oxyfluoride is fairly common. I am not familiar with the current technique of depositing such films. Thorium oxide, such as used in gas mantles, is one of the highest, if not the highest, temperature melting oxides. Wavelength Selective Filters For many optics applications, a specific range of wavelengths needs to be passed or blocked. For example, to eliminate unwanted lasing lines in the beam of a multiline laser, or to eliminate the 808 nm and 1,064 nm residual IR from a 532 nm (green) DPSS laser. There are two major classes of optical filters: • Bulk absorbing filters: These are made with a material that absorb ranges of wavelengths through their entire thickness. Colored glass or plastic are examples of this type of filter. A colorless base material has some type of dopant mixed in when it is manufactured. Many common household ite
