What is chirped Gaussian pulse?

What is chirped Gaussian pulse?

The chirped Gaussian input pulses are the pulses which are usually produced from directly modulated semiconductor lasers. As in SOA gain saturation—Gaussian pulses, we will consider the pulses with a pulse width much shorter than the carrier lifetime. The carrier wavelength of the Gaussian pulse is 1.55 mm.

What is chirped pulse amplification used for?

Chirped-pulse amplification, or CPA, is a technique for creating ultrashort, yet extremely high-energy laser pulses necessary in a variety of applications—including the manufacturing of glass for cellphone screens.

What is chirp effect?

Chirp is a sudden change of the center wavelength of a laser, caused by laser instability. A chirp is a signal frequency that increases over time, called “up-chirp,” or decreases, called “down-chirp.” In some sources, the term chirp is used interchangeably with sweep signal.

What is electronic chirp?

A chirp is a signal in which the frequency increases (up-chirp) or decreases (down-chirp) with time. In some sources, the term chirp is used interchangeably with sweep signal.

What is SPM in optical fiber?

Self-phase modulation (SPM) is a nonlinear optical effect of light–matter interaction. An ultrashort pulse of light, when travelling in a medium, will induce a varying refractive index of the medium due to the optical Kerr effect.

What is a transform limited pulse?

A bandwidth-limited pulse (also known as Fourier-transform-limited pulse, or more commonly, transform-limited pulse) is a pulse of a wave that has the minimum possible duration for a given spectral bandwidth. Bandwidth-limited pulses have a constant phase across all frequencies making up the pulse.

What is a chirped laser?

Chirped pulse amplification (CPA) is a technique for amplifying an ultrashort laser pulse up to the petawatt level, with the laser pulse being stretched out temporally and spectrally, then amplified, and then compressed again.

What does getting chirped mean?

Chirp. verb. to chirp somone is to insult them or talk badly about that person or people. possibly originated from cearcian old english chirkin which means “to twitter” which is from “creak, gnash” which means to strike somthing together in anger.

What is the process of compression of a chirped pulse?

The chirp pulse compression process transforms a long duration frequency-coded pulse into a narrow pulse of greatly increased amplitude. It is a technique used in radar and sonar systems because it is a method whereby a narrow pulse with high peak power can be derived from a long duration pulse with low peak power.

What is chirp bandwidth?

The chirp bandwidth can be straightforwardly computed as the product of βr times the duration of the pulse, i.e., the chirp rate can be expressed as. (5.74) where Br is the transmitted bandwidth and Tp is the duration of the pulse. A linear instantaneous frequency results in a quadratic phase, i.e., (5.75)

What is self steepening?

For a laser pulse travelling through an optical fiber, its intensity is highest at its peak, so the Kerr effect will be strongest there. This means that the peak travels slightly slower than the rest of the pulse, leading to self-steepening of its trailing edge.