High power ultrafast lasers are widely used because of their short pulse duration and peak power. Ultrafast lasers are used in material processing applications, medical fiber lasers, microscopy and other fields. All the advantages of fiber lasers provide higher power. However, fiber laser technology is particularly sensitive to thermal lensing. Thermal lensing is a process that occurs in ultrafast laser gain media, especially at higher power levels. It greatly limits the quality and output power of the laser beam. These processes degrade the performance of ultrafast lasers and can also lead to mode-free and pulse generation. For high power ultra-fast lasers, thermal lenses may even cause the entire system to collapse. In addition, thermal lens effect can cause astigmatism of ultrafast laser cavity. Ultrafast lasers operate in continuous wave (CW) mode for cavity alignment. The ultrafast laser is then switched to a pulsed structure for practical use. But the thermal lensing effect can interfere with the work of ultra-fast laser systems. Ultrafast lasers are inefficient because pulsed laser beams cannot be used. However, there are some options available to help manipulate the inherent thermal properties of gain media and prevent thermal lensing. One of them is to choose a suitable dispersion mirror coating. With the help of highly dispersed endoscopy coatings, scientists have an opportunity to minimize thermal lensing. As a result of these achievements, they can produce better high-power ultra-fast lasers with intracavity optics that can ignore thermal effects. These ultrafast laser systems are suitable for both external optics and ultrafast laser cavity applications. Thermal lens confinement can monitor laser beam stability and pulse compression and minimize harmful thermal effects. Scientists can develop ultrafast mirrors with high dispersion for ultrafast lasers. These mirrors can maintain high reflectivity and ideal pulse compression while providing negligible thermal effects. These properties are achieved through careful management of different processes during coating deposition. However, some ultra-fast laser systems do not require this newly developed technology. The average power of some lasers is not high enough to produce a thermal lensing effect. So it's not a big deal for them. Some fiber laser systems do not include solid-state laser cavities, where thermal effects may have a place. However, in solid state high power ultrafast lasers, low thermal lens is very important.
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