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A '''laser''' was, in a description posited by [[Leela]] and approved by the [[Fourth Doctor]], a very powerful light. ([[TV]]: ''[[Horror of Fang Rock (TV story)|Horror of Fang Rock]]'') Many lasers were harmless and used in some games, but others were used as deadly weapons. During their campaign to recruit warriors, the [[Uvodni]] utilised harmless laser weapons in their interactive laser-tag game [[Combat 3000]]. However, on board their ship, the [[Kudlak]] warriors carried deadly blaster rifles that fired a yellow laser burst. ([[TV]]: ''[[Warriors of Kudlak (TV story)|Warriors of Kudlak]]'') | A '''laser''' was, in a description posited by [[Leela]] and approved by the [[Fourth Doctor]], a very powerful light. ([[TV]]: ''[[Horror of Fang Rock (TV story)|Horror of Fang Rock]]'') The word "laser" was an acronym for '''Light Amplification by Stimulated Emission of Radiation'''. ([[PROSE]]: {{cs|Time Lord Technology (feature)|page=57}}) Many lasers were harmless and used in some games, but others were used as deadly weapons. During their campaign to recruit warriors, the [[Uvodni]] utilised harmless laser weapons in their interactive laser-tag game [[Combat 3000]]. However, on board their ship, the [[Kudlak]] warriors carried deadly blaster rifles that fired a yellow laser burst. ([[TV]]: ''[[Warriors of Kudlak (TV story)|Warriors of Kudlak]]'') | ||
Some weapons, such as [[Sontaran laser]]s, were called "lasers" despite travelling slower than light. ([[TV]]: ''[[The Sontaran Stratagem (TV story)|The Sontaran Stratagem]]'') | Some weapons, such as [[Sontaran laser]]s, were called "lasers" despite travelling slower than light. ([[TV]]: ''[[The Sontaran Stratagem (TV story)|The Sontaran Stratagem]]'') | ||
=== Uses of lasers === | === Uses of lasers === | ||
Lasers were frequently used in weaponry such as laser rays, beams, or guns. ([[TV]]: ''[[The Power of the Daleks (TV story)|The Power of the Daleks]]'' | Lasers were frequently used in weaponry such as laser rays, beams, or guns. ([[TV]]: ''[[The Power of the Daleks (TV story)|The Power of the Daleks]]'', etc.) | ||
Lasers could also be used for a defensive purpose to guard vaults or other secure locations. If the laser beams were interrupted by a person, they would trigger an [[alarm]]. This method of defense could be defeated by changing the refractive index of the air, or by using a [[prismatic beam]]. ([[TV]]: ''[[City of Death (TV story)|City of Death]]'') | Lasers could also be used for a defensive purpose to guard vaults or other secure locations. If the laser beams were interrupted by a person, they would trigger an [[alarm]]. This method of defense could be defeated by changing the refractive index of the air, or by using a [[prismatic beam]]. ([[TV]]: ''[[City of Death (TV story)|City of Death]]'') | ||
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* In [[surgery]], lasers were found in [[laser scalpel]]s ([[TV]]: ''[[Mindwarp (TV story)|Mindwarp]]'') and [[laser saw]]s. ([[TV]]:'' [[Children of Earth: Day One (TV story)|Children of Earth: Day One]]'') | * In [[surgery]], lasers were found in [[laser scalpel]]s ([[TV]]: ''[[Mindwarp (TV story)|Mindwarp]]'') and [[laser saw]]s. ([[TV]]:'' [[Children of Earth: Day One (TV story)|Children of Earth: Day One]]'') | ||
* They were also used for scientific purposes in material analysis, although the [[Third Doctor]] derided them as "primitive". ([[TV]]: ''[[Spearhead from Space (TV story)|Spearhead from Space]]'') | * They were also used for scientific purposes in material analysis, although the [[Third Doctor]] derided them as "primitive". ([[TV]]: ''[[Spearhead from Space (TV story)|Spearhead from Space]]'') | ||
* [[Hologram | * [[Hologram]]s were created using lasers to project light. ([[TV]]: ''[[The Talons of Weng-Chiang (TV story)|The Talons of Weng-Chiang]]'') | ||
* [[Laser scope | * [[Laser scope]]s were used by the [[Dalek]]s on [[Skaro]] as surveillance devices. ([[TV]]: ''[[The Daleks (TV story)|The Daleks]]'') | ||
* [[Animal | * [[Animal]]s and their habitats could be converted into [[Magnetic energy|magnetic]] signals and held within laser crystals using a [[Continuous Event Transmuter]]. ([[TV]]: ''[[Nightmare of Eden (TV story)|Nightmare of Eden]]'') | ||
* A laser cutter could be used to cut circuits or other objects. ([[TV]]: ''[[Earthshock (TV story)|Earthshock]]'') Similarly, lasers could be used to bore into the crust of a planet. ([[TV]]: ''[[The Runaway Bride (TV story)|The Runaway Bride]]'') | * A laser cutter could be used to cut circuits or other objects. ([[TV]]: ''[[Earthshock (TV story)|Earthshock]]'') Similarly, lasers could be used to bore into the crust of a planet. ([[TV]]: ''[[The Runaway Bride (TV story)|The Runaway Bride]]'') | ||
* The [[Tenth Doctor]] claimed to have owned a [[laser spanner]], ([[TV]]: ''[[Smith and Jones (TV story)|Smith and Jones]]'') which had a [[torch]]. ([[PROSE]]: ''[[The Mystery of the Haunted Cottage (short story)|The Mystery of the Haunted Cottage]]'') | * The [[Tenth Doctor]] claimed to have owned a [[laser spanner]], ([[TV]]: ''[[Smith and Jones (TV story)|Smith and Jones]]'') which had a [[torch]]. ([[PROSE]]: ''[[The Mystery of the Haunted Cottage (short story)|The Mystery of the Haunted Cottage]]'') | ||