Q-switchingn.

Brit.

/ˌkjuːˈswɪtʃɪŋ/, U.S.

/ˌkjuˈswɪtʃɪŋ/

Origin: Of multiple origins. Partly formed within English, by compounding. Partly formed within English, by derivation. Etymons: Q n., switching n.; Q-switch n., Q-switch v., -ing suffix¹.

Etymology: Partly < Q n. (compare Q n. 11) + switching n., and partly < either Q-switch n. or Q-switch v. + -ing suffix¹. Compare Q-switched adj., and also Q-spoiling n.

Physics.

The process of pumping a laser that has a low Q (degree to which it is undamped: see Q n. 11), 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; the use of a Q-switch.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > light > laser > [noun] > blocking mechanism > use of

Q-spoiling1963

Q-switching1963

1963 Jrnl. Appl. Physics 34 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.

1968 New 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.

2005 T. Amand & X. Marie in C. Rullière Femtosecond Laser Pulses (ed. 2) v. 142 The second approach to the generation of ultrafast optical pulses was to apply classical Q-switching techniques to semiconductor lasers.

This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).

单词	q-switching
释义	Q-switchingn. Brit. /ˌkjuːˈswɪtʃɪŋ/, U.S. /ˌkjuˈswɪtʃɪŋ/ Origin: Of multiple origins. Partly formed within English, by compounding. Partly formed within English, by derivation. Etymons: Q n., switching n.; Q-switch n., Q-switch v., -ing suffix¹. Etymology: Partly < Q n. (compare Q n. 11) + switching n., and partly < either Q-switch n. or Q-switch v. + -ing suffix¹. Compare Q-switched adj., and also Q-spoiling n. Physics. The process of pumping a laser that has a low Q (degree to which it is undamped: see Q n. 11), 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; the use of a Q-switch. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > laser > [noun] > blocking mechanism > use of Q-spoiling1963 Q-switching1963 1963 Jrnl. Appl. Physics 34 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. 1968 New 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. 2005 T. Amand & X. Marie in C. Rullière Femtosecond Laser Pulses (ed. 2) v. 142 The second approach to the generation of ultrafast optical pulses was to apply classical Q-switching techniques to semiconductor lasers. This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022). < n.1963
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