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Red (635 nm), blueish violet (445 nm), and green (520 nm) laser pointers. A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.
Establishment of field of distance education Influence on open learning systems worldwide Charles A. Wedemeyer (1911–1999) was a pioneer in the field of independent and distance learning .
LE Systems, under the sponsorship of DARPA, developed a dazzler based on a DPSS laser, with green light output at 532 nm, essentially a higher-intensity version of a green laser pointer. 532 nm light interacts with human eyes well in both daylight and reduced light conditions.
Infrared & Red Light Therapy. As LifePro's cold laser therapy device proves, big things come in small packages and budgets.This gadget can easily hit in your desk drawer, but it certainly packs a ...
A green laser pointer is a frequency doubled Nd:YVO 4 diode-pumped solid state laser . [48] Nd:YAG can be also made to lase at its non-principal wavelength. The line at 946 nm is typically employed in "blue laser pointer" DPSS lasers, where it is doubled to 473 nm. [49] [50] [51]
Talk about a tale of two cities. A new report calls New York one of the best cities in the country for an active lifestyle — while a spot right across the Hudson River ranks as one of the worst ...
Lomak keyboards being used with a head-pointer and a hand-pointer. LOMAK is an acronym for Light Operated Mouse And Keyboard.It is an assistive technology device designed for use by people who cannot use a standard computer keyboard and mouse.
A common stomach bug is surging, according to new data from the US Centers for Disease Control and Prevention.. In the week of December 5, there were 91 outbreaks of norovirus reported, up from 69 ...
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