Exam 16: Laser Technology and Devices

Injection lasers operating in smaller wavelengths are subjected to increased carrier losses.

The diode-cladding-pumped Erbium praseodymium-doped fluoride device operates at wavelength.

Lasing obtained in __________ when 191 mW of pump light at a wavelength of 0.477 ?m is launched into laser.

Fiber based lasers provide diffraction-limited power at higher levels than solid-state laser. State whether the given statement is true or false

The absence of _______________ in LEDs limits the internal quantum efficiency.

How many sections are included in a sampling grating distributed Bragg-reflector laser (SG-DBR)?

The mechanism which results from a refractive index change in the passive waveguide layer is called as

In a junction diode, an equilibrium condition occurs when

The parameters having a major role in determining threshold current of efficiency of injection laser are:

In a QC laser, a same electron can emit number of photons.

In QC lasers, it is possible to obtain different output signal wavelengths. This can be achieved by

The thulium doped fiber laser when pumped with alexandrite laser output at 0.786 ?m, the laser emits at

A technique based on inter-sub band transition is known as

A QC laser is sometimes referred as:

Replacing Sn with Eu, Cd or Ge in some _________________ the band gap.

The lasing line-width of Fox-smith resonator is ____________________

Determine the total carrier recombination lifetime of a double heterojunction LED where the radioactive and nonradioactive recombination lifetime of minority carriers in active region are 70 ns and 100 ns respectively.

The phenomenon resulting in the electrons to jump from one state to another each time emitting of photon is known as :

The hole concentration in extrinsic materials is _________ electron concentration.

An MQW cascaded laser is more advantageous because of: