May 20, 2020
Since it came out in the 1960s, the laser has become a "conventional weapon" in people's production and life: in the industrial field, the laser can easily be competent for drilling, cutting and welding; in medicine, using high energy of laser can treat surgery such as retinal detachment; in the military, improving laser energy can be made into a powerful light weapon.
According to the working mode of laser, the laser can be divided into continuous laser and pulse laser. Take the flashlight as an example. Always closing the button means continuous work. A quick switch on or off is equivalent to sending out a "light pulse".
The output power of the continuous laser is generally low, which is suitable for laser communication, laser surgery, and other occasions; pulse laser has a large output power, which is suitable for cutting and ranging. In recent years, the ultrashort pulse laser has become the first development trend in the laser field.
Considering the current situation of ultrashort pulse laser from the application point of view, it can be roughly divided into the following three categories.
1. Laser for physical science research.
This is the first established application field of the ultrashort pulse laser device. Because this application puts forward various requirements for pulse characteristics, such as wavelength, pulse width and pulse energy, a variety of lasers can be used, including dye laser and excimer laser.
In the case of focusing on performance and not considering cost, solid-state lasers are often used. The performance of solid-state laser is flexible (the tunable range of parameters such as pulse energy or repetition frequency is relatively wide), such as the laser used for fusion ignition or the large-scale laser system developed and utilized in various research equipment.
2. It is expected to be used as a laser for industrial equipment. It is mainly used in the field of measurement and processing. The ideal machining results can be obtained by using the short-pulse laser, but the reliability, maintainability, and cost of the equipment should be considered.
In recent years, with the improvement of the reliability of mode-locked solid-state lasers and the emergence of high-power fiber lasers, people place great hopes on the development of this field.
3. Semiconductor laser and fiber laser as an optical information communication system devices. As far as the application of this industry is concerned, the social benefits are the greatest, but it is also vulnerable to the influence of market conditions, information and communication policies, and other social conditions. The industry slump brought about by the collapse of the IT bubble is fresh.
In addition to the performance of the device, the reliability, cost, environmental protection, and other issues must be considered, and the technical requirements are strict. In the long run, the field of communication is the one with the highest expectation.