Femtosecond lasers, what are femtosecond lasers, femtosecond lasers introduced

A femtosecond laser is a laser that operates in the form of pulses, with a very short duration, only a few femtoseconds, and one femtosecond is 10 to the minus 15th power, that is, 1,1000 trillion seconds, which is thousands of times shorter than the shortest pulse obtained by electronic methods, and almost the shortest pulse that human beings can obtain under experimental conditions at present. This is the first feature of femtosecond lasers. The second feature of femtosecond lasers is that they have a very high instantaneous power, which can reach one trillion watts, which is 100 times more than the total power generated in the world at present.

A third feature of femtosecond lasers is that they can focus into areas of space smaller than the diameter of a human hair, making the electromagnetic field several times stronger than the force exerted by the nucleus on the surrounding electrons.

Judging from your description, considering that it may be related to long-term sleep deprivation, unreasonable eye use, and lack of movement caused by the change of the eye axis, the above two types of myopia laser surgery are currently the types of myopia laser surgery, they both change the refraction through the change of corneal thickness, but neither can completely restore myopia, only change the refraction. In general, femtosecond laser surgery uses femtosecond laser throughout the operation, while femtosecond laser surgery mainly uses laser when making corneal flaps and excimers when cutting corneas.

Germany's Menlo Systems GmbH was founded by Theodor, winner of the 2005 Nobel Prize in Physics, and Hal & Hansh has made significant contributions to the accurate measurement of frequencies using frequency combs The technology can accurately calculate the time with an accuracy of 10-14. Optical frequency filtering can now be used to accurately measure the frequency of light of various colors. This technology has made it possible to study the stability of natural constants over a given period of time, to develop very accurate clocks and to improve global positioning techniques.

German scientist Hansh Menlo Systems GmbH from Germany offers you C-Fiber T-Light doped fiber femtosecond lasers (1560nm and 780nm optional), Titanium-sapphire femtosecond ** (1GHz), M-Comb FC1500 femtosecond optical frequency synthesizer, XPS800 femtosecond phase stabilizer, APS800 ultrafast amplification phase stabilizer and high sensitivity photodetectors.

Hello, are you talking about the surgical equipment used by femtosecond laser, the equipment currently used by Quanfei is German Zeiss, Semi-Flying Image, Nuctech, Eagle Vision, Da Vinci and Armas 1050.

A phase stabilizer in Germany.

There are three types of femtosecond laser myopia surgery:

Femtosecond flap LASIK: Half femtosecond laser, femtosecond laser to make corneal flap, excimer laser to eliminate corneal stroma.

Flap full femtosecond laser: get rid of the excimer laser and corneal lamellar knife, femtosecond laser makes corneal flap, femtosecond laser eliminates corneal stroma, and the surgical process is all done by femtosecond laser.

Flapless ReLEx Laser: The highest level of laser myopia surgery, the corneal incision is less than 4 mm, the best degree of corneal saving, the postoperative visual quality is perfect, and various symptoms are avoided after surgery, and the surgical process is also completed by femtosecond laser.

Femtosecond equipment: German Zeiss VISUMAX full femtosecond laser, American intralase FS femtosecond laser, Da Vinci LDV femtosecond laser, German Eagle vision femtosecond laser.

German Zeiss VISUMAX full femtosecond laser: the above three femtosecond laser surgical methods can be done, and personalized cutting can also be done according to different needs.

American Intralase FS femtosecond laser, Da Vinci LDV femtosecond laser, German Eagle femtosecond laser: only femtosecond flap LASIK can be carried out.

At present, the femtosecond laser is carried out, full femtosecond, Jingdiao green femtosecond, and half femtosecond, which are all relatively mainstream surgical methods, you can go to a professional ophthalmology hospital to check first, and choose the most suitable surgical method according to your corneal condition.

There are many surgical methods for myopia, which are generally divided into two categories according to different surgical methods; The first type is laser surgery**, also known as corneal refractive surgery, including excimer laser surgery and femtosecond laser surgery; The second type is intraocular refractive surgery, including phakic intraocular lens implantation and lens exchange, and different surgical methods are suitable for different people and different degrees of myopia.

There are three types of femtosecond laser surgery: full femtosecond laser surgery, Jingdiao green femtosecond laser surgery, and aerospace femtosecond laser surgery, which are all mainstream surgical methods at present, and you need to choose the surgical method that suits you according to the preoperative examination results such as corneal condition and corneal thickness.

At present, the more common ones are Zeiss Germany, Eagle Vision FS200, Intralase, etc.

Hello, there are many kinds of myopia surgery, and the femtosecond laser you said indicates a device for making a flap, not a surgical device, because if it is an experienced doctor who makes a flap, it is the same as a machine flap, and the femtosecond is very expensive, and the ** for a corneal flap is 8000-10000 yuan. Our hospital uses excimer laser corneal refraction** technology, which is the beam of the excimer laser precisely controlled by the computer, so that the anterior surface of the eyeball is slightly flattened, so that the external light can accurately converge into an image in the fundus, so as to achieve the purpose of correcting myopia.

The ophthalmology experts of the 254 Hospital of the People's Liberation Army are good at personalized myopia laser surgery and non-surgical myopia with orthokeratology lenses, with nearly 40,000 successful clinical cases, and have American Nuctech surgical equipment, which is highly praised and trusted by myopia patients.

Lasers were once regarded as mystical lights and have been widely used by humans. In recent years, scientists have discovered a more peculiar laser femtosecond laser, femtosecond (femtosecond) is also called femtosecond, referred to as FS, is a unit of measurement for the length of the scale, femtosecond laser is the shortest pulse that human beings can obtain under laboratory conditions. The huge power emitted by femtosecond laser in an instant is greater than the total power of power generation in the world, and has been applied, and scientists will play an important role in the generation of new energy in the next century.

Femtosecond lasers are divided into femtosecond lasik and individualized femtosecond lasik.

Femtosecond LASIK is a femtosecond laser technique used to perform LASIK surgery.

And the so-called individualization, in layman's terms, is tailor-made. Before the operation, the information of the eye and corneal surface is collected by wavefront aberration meter and corneal topographer, and the obtained information is analyzed and processed, so that more specific and individualized examination data can be obtained, and then individualized cutting can be designed and carried out with the excimer laser system.

What are the benefits of individual cutting? In life, the vast majority of people do not need to make clothes by body, as long as they can buy suitable clothes according to their body type and according to the regular large, medium and small sizes. There are only a very small number of people who have a special body shape, and clothes are only suitable if they are tailor-made.

The same is true for individualized laser cutting, which is only suitable for a very small number of patients, such as patients with irregular astigmatism and complications of laser cutting surgery, and these patients are less than 5% of the total number of surgeries.

Individualized cutting has the advantages of significantly improving postoperatively corrected visual acuity, significantly improving visual sensitivity, significantly improving night vision, better astigmatism correction, and reducing the incidence of glare and halos, resulting in refractive correction of optimal visual acuity.

The latest femtosecond laser surgery combination in 2013 is the new Eagle Vision femtosecond laser FS200 and excimer laser EX500 device combination, which takes less than 50 seconds on the operating table.

Steps of femtosecond laser myopia surgery.

The surgery consists of two steps: one is to make a corneal flap; The second is to perform corneal stromal layer cutting. There are also two types of femtosecond laser surgical equipment: one is "traditional excimer laser technology" and the other is "femtosecond laser combined with excimer laser technology".

Traditionally, LASIK is a lap of the cornea that is manually made by the surgeon with a lamellar knife and then cut the stromal layer of the cornea with an excimer laser. With the advancement of medical technology, a femtosecond laser device used to make corneal flaps has appeared, replacing the manual corneal flap procedure in the surgical process, and there is a "ordinary femtosecond" surgical method. Euroeyes introduced that ordinary femtosecond laser surgery is first made by femtosecond laser equipment to make a flip-open corneal flap, and then the corneal is cut with an excimer laser.

Since the excimer laser performs the corneal stromal cutting in an "ablative" manner, there will be a burnt smell during the procedure. Because the femtosecond laser plays the role of flap control in this surgical modality, this method is also called "femtosecond".

ReLEx laser surgery.

In the whole process of ReLEx laser surgery, there is no need to make an open corneal flap or an excimer laser, but to use the ReLEx laser to completely shape the corneal matrix through two interlaminar blasts of different depths in the cornea, and then remove it through a small incision of 2-4mm to complete the operation. Since the "ReLEx" surgery does not require the production of a flip-open corneal flap, it is truly a "cutting" method for corneal refractive adjustment. Therefore, "full femtosecond" is more precise, safer, more comfortable than "half femtosecond" surgery, and the postoperative recovery is faster.