Externet
Well-Known Member
Several questions about laser diodes...
-When a laser diode is said to be a 30 mW, is that the optical power output or the power fed to it ?
-If the voltage across anode and cathode is 2.5Vf; a 100mW laser diode is to have 0.1 / 2.5 = 40mA current ?
-There was awell written tutorial article on the web about a clever simple method to determine the maximum safe operating current for an unknown/unmarked laser diode which I believe was based in perhaps observing a subtle 'knee' when plotting observed V I curves. I cannot find it now. Would you know about it ?
-A laser diode can focus to a few micrometers dot, but as seen on typical lasers, they project a spot of about a couple of millimetres diameter. What am I missing ? How to reduce the diameter of the beam ?
-Several same power laser diodes of different visible wavelenghts; which one is more dangerous, as to produce burns or retinal damage ? Red, green, blue... ?
-Laser diode dies do not use a mirror in one end as gas lasers? (**broken link removed**)
-Is there any passive goggles that allow seeing an infrared laser beam ? (not directly)
-Would a laser beam that can burn your skin do the same 500 yards away ?
-When a laser diode is said to be a 30 mW, is that the optical power output or the power fed to it ?
-If the voltage across anode and cathode is 2.5Vf; a 100mW laser diode is to have 0.1 / 2.5 = 40mA current ?
-There was awell written tutorial article on the web about a clever simple method to determine the maximum safe operating current for an unknown/unmarked laser diode which I believe was based in perhaps observing a subtle 'knee' when plotting observed V I curves. I cannot find it now. Would you know about it ?
-A laser diode can focus to a few micrometers dot, but as seen on typical lasers, they project a spot of about a couple of millimetres diameter. What am I missing ? How to reduce the diameter of the beam ?
-Several same power laser diodes of different visible wavelenghts; which one is more dangerous, as to produce burns or retinal damage ? Red, green, blue... ?
-Laser diode dies do not use a mirror in one end as gas lasers? (**broken link removed**)
-Is there any passive goggles that allow seeing an infrared laser beam ? (not directly)
-Would a laser beam that can burn your skin do the same 500 yards away ?