Femtosecond laser is a laser over the past 20 years, science developed one of the most powerful new tools. Femtosecond time domain pulse width is so short, the current has reached 4fs less. 1 femtosecond (fs), the 10-15s, only 10 million billionths of a second, if the 10fs to measure the universe as a geometric mean of its life, but only just 1min; femtosecond pulse is so strong, multi- class chirped pulse amplification (CPA) technique to obtain the maximum pulse peak power can reach 10 terawatts (TW, ie 1012W) even beat Watts (PW, ie 1015W) order of magnitude. The handy use of green laster pointer is very convenient.
Its focus to the intensity of solar radiation than on Earth will all be focused to a pinpoint of light after the size of the energy density is even higher. Femtosecond laser is completely a miracle of human creation. Past two decades, from the Kerr-lens mode-locked dye laser to a femtosecond laser Ti stones and, later, the femtosecond diode-pumped solid-state lasers and femtosecond fiber laser, although the pulse width and energy is constantly refresh the record , but the greatest progress than an ultra-femtosecond pulse becomes a breeze. Sandia National Laboratories R. Trebino said: "Over the past 10 years, (fast) technology has significantly improved. The handy feature of green laster pointer is very practical in use.
Titanium sapphire laser and fiber laser is now to make this (femtosecond) laser operation becomes simple and stable. This laser has been able to buy one now, but 10 years ago, but you must create. "For example, the famous manufacturer of femtosecond laser system Clark-MXR United States will produce high-power femtosecond pulses of all the components all integrated into a box, using erbium-doped fiber femtosecond laser as a seed source, with no adjustment (NO Tweak) of special design, forming the world's unique, ultra-stable, ultra-compact CPA2000 Series Titanium Gem chirped pulse amplification system does not require such a commercial femtosecond expert system to operate, can be widely used in scientific research and industrial in many areas on. The light size of 10mW blue violet laser pointer can save some transportation fee.
According to ultra-short femtosecond laser and superior features, in general, applied research can be divided into ultra-fast transient phenomenon and powerful phenomena. They are reduced as the laser pulse width and pulse energy increases to in-depth and continuous development. Femtosecond pulse laser is the most direct application people use it as a light source to form a variety of time-resolved spectroscopy and pump / probe techniques. Directly contributing to the development of its physical, chemical, biological, materials and information science research into the microscopic field of ultrafast process, and created some new areas of research. The use can carry 200mW Laser Pointer around due to the light weight.
Such as femtosecond chemistry, quantum control of chemical, semiconductor coherent spectroscopy. Femtosecond pulse laser and the combination of nano-microscopy, so that people can study semiconductor nanostructures (quantum wires, quantum dots and nanocrystals) in the carrier dynamics. In biology, the use of femtosecond laser technology are being provided by the difference absorption spectrum, the pump / probe techniques to study the photosynthetic reaction center of mass energy transfer with charge separation process. Ultrashort pulse laser is also used in information transmission, processing and storage areas. Some pubs need 100mW laser pointer to create the entertainment atmosphere.
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