A femtosecond laser is a laser which emits optical pulses with a duration well below 1 ps (→ ultrashort pulses), i.e., in the domain of femtoseconds (1 fs = 10−15 s). It thus also belongs to the category of ultrafast lasers or ultrashort pulse lasers.
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1 5-nJ Femtosecond laser Ti3+:sapphire laser pumped with a single 1 W green diode.
In optics, an ultrashort pulse of light is an electromagnetic pulse whose time duration is of the order of a picosecond (10−12 second) or less. Such pulses have a broadband optical spectrum, and can be created by mode-locked oscillators. They are commonly referred to as ultrafast events. Amplification of ultrashort pulses almost always requires the technique of chirped pulse amplification, in order to avoid damage to the gain medium of the amplifier.
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Applications for Femtosecond Laser.
Femtosecond laser-assisted cataract surgery has been shown to have no visual, refractive or safety benefit over manual phacoemulsification
Femtosecond (FS) laser is an infrared laser with a wavelength of 1053nm. FS laser like Nd: YAG laser works by producing photodisruption or photoionization of the optically transparent tissue such as the cornea. Application of either FS laser or Nd:YAG laser results in the generation of a rapidly expanding cloud of free electrons and ionized molecules. The acoustic shock wave so generated results in disruption of the treated tissue. However, the two lasers differ significantly in the amount of collateral damage they cause. Nd:YAG laser has a pulse duration in the nanosecond range (10-9 second) where as FS laser has pulse duration in the femtosecond range (10-15 second). Reducing the pulse duration reduces the amount of collateral tissue damage. In fact, collateral damage with FS laser is 106 times less than with the Nd:YAG laser. This makes FS laser safe for use in corneal surgeries which require exquisite precision
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Need Femtosecond Laser ?
Thorlabs‘ family of femtosecond lasers consists of the tunable Ti:Sapphire Tiberius® laser, <8 fs Octavius® laser, a Supercontinuum Generation Kit that spectrally broadens fs pulses near 800 nm, and our MIR Supercontinuum Source, which uses a dispersion-engineered InF3 fiber to generate a single-spatial-mode supercontinuum from 1.3 µm to 4.5 µm (7700 cm-1 to 2200 cm-1).