## What is threshold condition for lasing?

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The lasing threshold is the lowest excitation level at which a laser’s output is dominated by stimulated emission rather than by spontaneous emission. Below the threshold, the laser’s output power rises slowly with increasing excitation. Above threshold, the slope of power vs. excitation is orders of magnitude greater.

### What is threshold gain in laser?

For any laser to function, there must be more gain inside the laser cavity than loss, and the point at which the laser gain is just large enough to overcome the cavity loss enabling lasing is called gain threshold.

What is the threshold small-signal gain needed for laser operation?

required to sustain a small-signal gain coefficient of 0.01/cm.

What is threshold current in laser diode?

Threshold currents lie typically in the range of 25 – 250 mA and the output powers are typically in the range of 1 – 10 mW. The P/I curve slope above threshold current is called a LD’s slope efficiency and is defined as dP/dI.

## What is threshold current?

The minimum current needed to cause a device to activate.

### What is gain threshold?

Gain Threshold (GT) can be defined as the amount of damage (=yield loss) to justify management, and calculated by dividing the management costs by the market crop price.

What is optic threshold?

The laser damage threshold (LDT) or laser induced damage threshold (LIDT) is the limit at which an optic or material will be damaged by a laser given the fluence (energy per area), intensity (power per area), and wavelength.

What is the typical threshold current of the laser at 25 C?

Laser efficiencies are typically about 0.3 mW/mA at 25°C, and drop about 0.01 mW/mA for every 10°C increase in temperature.

## What is threshold current density?

The current density corresponding to that saturation point is called threshold current density, above which the laser output is dominated by stimulated emission.

### What is transparency current?

The transparency current density is sensitive to material quality: defects, traps and other sources of non-radiative recombination. It is also dependent on the rate of thermionic emission from quantum wells.

What is lasing action?

Hint: The real phenomenon that takes place during the production of a beam of laser light is called a lasing process. The action which creates the laser light will occur within a few nanoseconds. The combination of spontaneous emission as well as the stimulated emission respectively will cause the laser to laser.

Which scattering phenomenon has the highest threshold optical power?

Brillouin scattering can occur spontaneously even at low optical powers. This is different than Stimulated Brillouin Scattering which requires optical power to meet a threshold high enough to happen.