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THRESHOLD LASER [7 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2024-02-21

English

Subject field(s)
  • Lasers and Masers
CONT

Under thermodynamic equilibrium conditions, almost all atoms or molecules are in the ground state and so it requires more than half of this number to be excited out of the ground state to achieve laser action. This implies that a much larger pumping input would be required to exceed population inversion threshold.

French

Domaine(s)
  • Masers et lasers
CONT

Le seuil d'inversion de population est d'autant plus bas que la fréquence du rayonnement est faible.

Spanish

Save record 1

Record 2 2012-04-17

English

Subject field(s)
  • Lasers and Masers
CONT

The current threshold for lasing in GaAs is strongly temperature-dependent,... At low temperature(up to approximately 30 °K) the threshold is fairly constant. Above 100 °K, the threshold current density for laser operation increases rapidly with increasing temperature.

French

Domaine(s)
  • Masers et lasers
DEF

Densité minimale de courant électrique nécessaire pour provoquer un effet laser à une température spécifique.

CONT

L'avantage des lasers à points quantiques tiendrait à une nette augmentation d'intensité en fonction du courant d'excitation. Les meilleurs résultats jusqu'à ce jour, qui ne font toujours pas l'unanimité, indiquent qu'un laser à PQ d'InGaAs sur GaAAs, fonctionnant à une température de 77 K, présente une densité de courant de seuil de 120 A/cm2, soit environ cinq fois le rendement à température ambiante des lasers à puits quantiques actuels les plus perfectionnés.

Spanish

Save record 2

Record 3 2011-01-05

English

Subject field(s)
  • Lasers and Masers
  • Optics
  • Navigation Instruments
DEF

The phenomenon exhibited by laser gyros that is characterized by frequency locking of the clockwise and counterclockwise beams at low input rates.

CONT

Lock-in is a fundamental physical phenomenon associated with all oscillating devices. Laser gyros exhibit the same phenomenon, in that the coupling mechanism is the reflection of light from one laser beam back along the path where it interacts with the oppositely traveling beam. This is called backscatter and is caused primarily by imperfect mirrors.

OBS

[Lock-in] is caused by the coupling of energy between the laser beams and results in a threshold error near zero input angular rate unless a corrective means, such as biasing, is used.

Key term(s)
  • lock-in phenomena

French

Domaine(s)
  • Masers et lasers
  • Optique
  • Instruments de navigation
CONT

L'origine physique [du] blocage des oscillations [gyromètre laser] tient à ce qu'une partie de chacun des rayonnements se déplaçant dans un sens donné est renvoyée dans l'autre sens; ce renvoi est notamment dû aux irrégularités de surface des miroirs et aux variations d'indice de ces miroirs.

CONT

La structure simple du gyrolaser lui confère une excellente fiabilité et une bonne précision [...] Les défauts de surface des miroirs, même infimes, provoquent la rétrodiffusion d'une partie de chaque rayon qui se couple alors avec le rayon se propageant dans l'autre sens. Il se crée ainsi un couplage (lock-in) entre les faisceaux lasers et une zone aveugle pour les vitesses angulaires faibles.

Key term(s)
  • blocage des oscillations

Spanish

Save record 3

Record 4 2010-12-29

English

Subject field(s)
  • Physics
DEF

The minimum level of some input quantity needed for some process to take place.

CONT

... as threshold energy for a reaction, or the minimum level of pumping at which a laser can go into self-excited oscillation.

French

Domaine(s)
  • Physique
DEF

Valeur d'un paramètre dont dépend un phénomène [...] au-dessous de laquelle celui-ci ne se produit pas.

PHR

Appareil, dispositif, système à seuil.

Spanish

Save record 4

Record 5 2001-08-17

English

Subject field(s)
  • Lasers and Masers
DEF

The discharge current at which the gain of the laser just equals the losses.

DEF

The lowest excitation level at which a laser’s output is dominated by stimulated emission rather than spontaneous emission.

CONT

Light radiates from the laser in a narrow-angled cone. As the current increases, the optical amplifier gain increases. When the amplifier gain equals the mirror loss, the lasing threshold is reached; the laser begins to oscillate above threshold current.

French

Domaine(s)
  • Masers et lasers
DEF

seuil laser : Énergie minimum d'excitation nécessaire pour le fonctionnement de l'oscillateur laser.

Spanish

Save record 5

Record 6 1989-02-07

English

Subject field(s)
  • Lasers and Masers
DEF

A conventional laser diode(LD) that is biased just below its threshold.

French

Domaine(s)
  • Masers et lasers

Spanish

Save record 6

Record 7 1985-04-30

English

Subject field(s)
  • Lasers and Masers
CONT

threshold current of the laser section versus modulator current.

French

Domaine(s)
  • Masers et lasers

Spanish

Save record 7

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