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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.
Also used pulsed for marking and micromachining. A frequency doubled nd:YVO 4 laser is also the normal way of making a green laser pointer. Neodymium-doped yttrium calcium oxoborate Nd:Y Ca 4 O(BO 3) 3 or simply Nd:YCOB ~1.060 μm (~530 nm at second harmonic) laser diode
A long-range laser rangefinder is capable of measuring distance up to 20 km; mounted on a tripod with an angular mount. The resulting system also provides azimuth and elevation measurements. A laser rangefinder, also known as a laser telemeter, is a rangefinder that uses a laser beam to determine the distance to an object.
Lunar Laser Ranging stations Observatory Project Operating timespan Telescope Laser Range accuracy Ref. McDonald Observatory, Texas, US MLRS 1969–1985 1985–2013 2.7 m 694 nm, 7 J 532 nm, 200 ps, 150 mJ [29] [22] Crimean Astrophysical Observatory (CrAO), USSR 1974, 1982–1984 694 nm 3.0–0.6 m [30] Côte d'Azur Observatory (OCA), Grasse ...
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]
Very high frequency (VHF) two-frequency long range early warning radar: General Electric: AN/FPS-26: Height finder radar: AN/FPS-27: S-band Frequency Diverse (FD) search radar: Westinghouse Electronics: AN/FPS-30: Long range early warning radar: AN/FPS-35: Frequency diverse long range air defense search radar: Sperry Corporation: AN/FPS-41: S ...
Frequency-resolved optical gating (FROG) is a general method for measuring the spectral phase of ultrashort laser pulses, which range from subfemtosecond to about a nanosecond in length. Invented in 1991 by Rick Trebino and Daniel J. Kane, FROG was the first technique to solve this problem, which is difficult because, ordinarily, to measure an ...
Lidar (/ ˈ l aɪ d ɑːr /, also LIDAR, an acronym of "light detection and ranging" [1] or "laser imaging, detection, and ranging" [2]) is a method for determining ranges by targeting an object or a surface with a laser and measuring the time for the reflected light to return to the receiver.