Which technique is used to get femtosecond lasers?
The broader the spectrum of the laser light the more standing waves or modes exist inside a laser resonator. The number of these modes also depends on the spectral range of the gain medium of the femtosecond lasers. The actual technique used to generate a laser pulse within the resonator is called mode locking.
What is femtosecond laser used for?
In LASIK, the femtosecond laser is used on the cornea to create a corneal flap. Underneath that flap, the eye can be reshaped, and the flap serves to protect the eye as it heals. Since then, the technology has dramatically improved. Newer models of femtosecond lasers have an increased pulse frequency.
What does an Autocorrelator do?
The basic principle of an optical autocorrelator is to split an incoming pulse into two copies and to superimpose those with a variable temporal delay. A nonlinear interaction is used for obtaining a signal that depends on the pulse overlap, and the pulse duration can be retrieved from that signal.
Which of the following is used to measure width of an ultrashort laser pulse?
Several techniques are available to measure ultrashort optical pulses. Intensity autocorrelation gives the pulse width when a particular pulse shape is assumed. Spectral interferometry (SI) is a linear technique that can be used when a pre-characterized reference pulse is available.
What are femtosecond lasers used for?
It was approved in 2001 by the U.S. Food and Drug Administration for use in laser-assisted in situ keratomileusis, or LASIK eye surgery. In LASIK, the femtosecond laser is used on the cornea to create a corneal flap. Underneath that flap, the eye can be reshaped, and the flap serves to protect the eye as it heals.
Why are femtosecond lasers important?
Femtosecond lasers exhibit excellent capability in performing three-dimensional processing in transparent materials, especially glass, which makes them a powerful tool for micromachining optical fibers.