What Is a Femtosecond?

Femtosecond (femtosecond) is also called femtosecond, or fs for short. A femtosecond is only one trillionth of a second, which is 1e15 seconds or 0.001 picoseconds (1 picosecond is 1e12 seconds). Even light in a vacuum flying 300,000 kilometers per second can only travel 300 nanometers in one femtosecond. Visible light has an oscillation period of 1.30 to 2.57 femtoseconds. The extremely short time laser pulse is called femtosecond laser, and the extremely short time molecular vibration detection is femtosecond detection. The extremely short time physical process is femtosecond physics. In various scientific fields, the femtosecond time period is becoming a research hotspot. ^[1] .

Femtosecond (femtosecond) is also called femtosecond, referred to as fs, which is a unit of measurement for measuring the length of time. A femtosecond is only one trillionth of a second, which is 1e15 seconds or 0.001 picoseconds (1 picosecond is 1e12 seconds). Even light in a vacuum flying 300,000 kilometers per second can only travel 300 nanometers in one femtosecond. Visible light has an oscillation period of 1.30 to 2.57 femtoseconds. The extremely short time laser pulse is called femtosecond laser, and the extremely short time molecular vibration detection is femtosecond detection. The extremely short time physical process is femtosecond physics. In various scientific fields, the femtosecond time period is becoming a research hotspot. .

In addition to revealing the mysteries of natural science, the study of femtoseconds has promoted a new type of "

As we all know, the molecules and atoms that make up matter move fast every moment, this is microscopic matter

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Compared with mechanical corneal laminectomy, femtosecond lasers are used to make corneal flaps in LASIK myopia surgery. The biggest advantage or feature is that it makes very accurate corneal flap thickness and its accuracy (average fluctuations in: 10 to 15um) is 3 times the accuracy of the lamellar knife (average fluctuation is 30 to 45um), and the actual probability of corneal flap complications is tens of thousands of times lower. In addition, the negative pressure (approximately 35mmHg) of the suction ring used when making a corneal flap with a femtosecond laser is significantly lower than the negative pressure (approximately 65mmHg) when a corneal flap is made with a mechanical corneal laminar blade. Therefore, the use of femtosecond laser to make corneal flaps can greatly improve the surgical safety of excimer laser treatment of myopia, especially for patients with thin cornea, large corneal curvature variation, and high myopia.