| 释义 |
Q-switch, n. Physics.|ˈkjuːswɪtʃ|
Also q-switch.
[f. Q III. 3 + switch n.]
A means of suddenly increasing or decreasing the Q of a laser by effectively unblocking or blocking the optical path to one of the mirrors.
1963Jrnl. Appl. Physics XXXIV. 1000/2 (heading) Faraday effect as Q-switch for ruby laser. Ibid., The Q-switch..was placed between the ruby and the separated end mirror. 1966New Scientist 20 Oct. 93 Q-switches are employed to obtain a very powerful pulsed output from a laser by allowing the laser to store up energy; when it reaches a maximum the blockage is quickly removed, and an intense pulse of radiation is emitted. 1973Jrnl. Appl. Physics XLIV. 4067/1 The oscillation of the laser with the cavity closed is sensed by a fast photodiode whose output signal opens the electro-optical Q switch. 1979Nature 5 July p. vii/2 A compact pulsed ruby laser, that incorporates a q-switch.
So Q-ˈswitching vbl. n., the process of pumping a laser that has a low Q, and so cannot oscillate, and then suddenly increasing the Q so that the stored energy is released in a single pulse of very high power; Q-switch v. trans., to subject (a laser) to this process; Q-ˈswitched ppl. a.
1963Jrnl. Appl. Physics XXXIV. 1000/2 We wish to report the successful application of the Faraday effect (magneto-optic shutter) as a Q-switching technique for a ruby laser. Ibid. 3407/1 (heading) Q-switched CaWO4: Nd3+ laser. Ibid., A CaWO4:Nd3+ laser was successfully Q-switched. 1965Wireless World July 351/3 The ruby laser is Q-switched by a rotating prism. 1968McGraw-Hill Yearbk. Sci. & Technol. 223 Saturable absorbers have recently been used very successfully to Q-switch ruby and neodymium-doped lasers. 1968New Scientist 24 Oct. 205/1 Q-switching is a technique for producing giant laser pulses by preventing lasing action until a large amount of energy has been pumped into the atoms responsible. 1970Sci. Amer. Mar. 41 They used the 104-inch telescope to transmit and detect pulses of 50-nanosecond duration produced by a ‘Q-switched’ (short-pulse) ruby laser. 1974Physics Bull. Jan. 13/1 A four stage Q switched ruby laser is used to fire a pulse every three seconds, with a pulse length of a few tens of nanoseconds and an output energy of about 3 J. |