How about those laser pointers? No doubt you've heard reports of mischief now that lasers have become commonplace. I myself have observed youths surreptitiously "dotting" girls out front of Tower Records; I understand that doing this to a policeman is a crime in some jurisdictions. Received this center-wide email today: To: Resident Staff From: Radiation Safety Office Subject: Laser Pointers
You may have noticed that everywhere you look these days the word "Laser" is popping up. This is because lasers are being used in a wide variety of applications in both the manufacturing and medical fields. Lasers are rated in a hazard classification system of 1 to 4 with 4 being the most dangerous. Laser pointers fall into a category 2 or 3a. This means that the laser has the potential to cause eye damage from a direct exposure. The damage can vary from being startled or "flash-blinded", to having an "after-image" on your retina for many days, to having permanent lesions on your retina. The effect is similar to that of staring at the sun or staring onto the flash from a flash bulb. The effect from the laser is many times greater though because of the intensity of the light. Just recently it was reported that a laser pointer may have been the cause of a deadly crash on Highway 101. If this was indeed the fact, the most likely scenerio was that the driver was flash-blinded for a moment and lost control of the vehicle. This is the effect of improper use of a tool. In my own way, I was a laser pioneer. For the enormous sum of $100 I bought the smallest Helium-Neon laser Edmund had, after I'd accumulated enough pay from my great summer job as a lab assistant in 1974. (This was at the U.S. Army's Night Vision Lab at Fort Belvoir - doing experimental research creating solid-state laser-light emitting diode chips.) Earlier I described what I did with this big chunky 3" x 4" x 11" of a laser at the beach the next summer; that Fall I got my first apartment and the fun continued. Along the laser's bottom surface was a socket like a camera's, so sometimes I mounted it on my Dad's tripod - but it was easier to just hold the thing and point. <1> Hitting the stop sign at the end of the street was a rewarding challenge; the reflective surface diffused a blaze of red light. In early evenings, I'd torment the neighbors and one old guy in particular - he could be found tottering around the grounds in the early evening. Suddenly noticing the red spot on the sidewalk, he'd freeze. B has a laser pointer and does the same thing with her cat - like my neighbor, both victims have no experience with coherent light, so it's a puzzle. Unfortunately some kids saw me beaming the laser around one night, and they all congregated beneath my window, three floors down, shouting about "the red light". I switched off all my of appliances and hunkered down for a long while, and thereafter only played the beam outside with extreme discretion. The HeNe unit only lasted another year or so, growing feeble - helium molecules are so small, they leak out of the glass tube containing the gas mixture.
On My Tube: Star Trek scene I'd like to see:
[The Transporter Room. The usual squad is
assembled and ready to beam down. The crew's
cool professionalism is evident.
[The surface of an alien planet.
quick cut back to |
Glossary: LASER - Light Amplification by Stimulated Emission of Radiation (one of our most durable acronyms, no longer requiring capitalization) |
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<1> Standing at the window, cradling this thing plugged into the wall, you felt kinda like that patent office guy in the Charles Adamms cartoon, standing with the inventor sitting nearby, pointing a fancy ray gun out the window with the caption