The laser is produced by the expansion of the stimulated emission, with good monochromaticity, spatial coherence and temporal coherence, good directionality and high brightness. These four characteristics of the laser show that the most powerful laser has a high coherent light intensity in a large coherent volume. Coherence is an important feature of the laser. Conventional laser and white laser, we exclude monochrome (because the white light is not monochromatic), all the laser must have good coherence, direction and high brightness characteristics, can be called laser.

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Solid lasers contain two key crystal-laser crystals and non-linear crystals. In practical applications, people need different wavelengths of laser, the laser provides the laser wavelength required for practical applications, depending on the nonlinear crystal; the laser crystal provides the excitation laser, by stimulating the nonlinear crystal to obtain the desired wavelength laser. Accordingly, we conclude that white laser as a separate laser light source, if produced by nonlinear crystals, then it must have all the characteristics of the laser.

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Through the three primary colors born, the lack of a lot of 100mw laser pointer excellent characteristics of the white laser gave a scientific name "quasi white laser". Quasi-white laser lacks many excellent features of the laser, does not belong to the perfect white laser, not the true sense of the white laser. We believe that the coherent lack of photonic crystal fiber laser generated by white laser, also belong to the "white laser".

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The white laser generated by the photonic crystal fiber laser has the characteristics of high power, broadband and supercontinence. However, the pulse is affected by the noise during the process of generating white laser light. The coherence of the resulting supercontinuum is also affected by influences. If the supercontinuum is used as a broadband light source for medical, metrological and optical pulse compression, it must have good coherence, so coherence is also an important aspect of measuring supercontinuum. It can be seen, although the photonic crystal fiber 300mw laser pointer can produce white laser, because of its coherence is destroyed, it can not be regarded as high-quality laser light source. This may be an important reason for its application is blocked.

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First of all, the true sense of the white laser, should have the traditional laser in addition to monochrome other than all the laser characteristics, but also should have the traditional laser does not have the excellent characteristics. Second, the white laser light source is white, so its spectrum is also consistent with the sun's rays into the sea level. We believe that the true sense of the white laser, should be consistent with the solar spectrum, with the coherence, super continuous, ultra-wideband, good direction, high brightness, covering ultraviolet, visible, infrared laser.

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The use of a complete nonlinear crystal, through the mid-infrared, or near-infrared red laser pointer incident, can produce a perfect solar spectrum laser, and this laser with a coherent, super continuous, ultra-bandwidth characteristics, really do a "laser Into the laser out "effect, is completely independent of the traditional three-color laser outside the independent laser. But also in the range of the band, can create any band of laser needed to make up for the traditional laser can not create any band of laser deficiencies.

Based on the traditional three-color laser developed white laser, and photonic crystal fiber laser, in the coherence of a serious lack of loss of many excellent characteristics of the laser, it can not be as an independent, true sense of the blue laser pointer light source, we can only It is classified as white laser category. When the white laser really have all the characteristics of the laser, and has the traditional laser does not have the advantages of the characteristics of time, in a wider range of scientific research, production applications play a white laser role.