Remarkable advantages of the hottest infrared lase

2022-08-05
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Remarkable advantages of infrared laser thermal imaging

(1) open room operation performance

(2) the imaging energy threshold is obvious (that is, there is no energy accumulation effect in the imaging process)

(3) technically mature high-power solid-state infrared laser light source (ir-ld10, compared with other low global warming potential refrigerants, the price of steel billets in China is lower and YAG), but the fatal weakness is that the sensitivity (sensitivity) is very low

most of the thermal imaging material systems rely on the change of physical state to realize imaging records, such as thermal melting, thermal vaporization, thermal phase change, thermal chemical reaction, etc. the temperature must be above the corresponding temperature of physical state change. Therefore, the physical stimulation source (laser or heating head) must have sufficient strength (power) to make it possible for the energy absorbed by the plate to contribute to the temperature rise (similar to the adiabatic condition), so as to reach the temperature sufficient to cause the change of state. Otherwise, the absorbed energy will disappear in the heat exchange with the environment, and the temperature of the plate cannot reach the temperature sufficient to cause the change of state

this is the reason why the thermal imaging system generally has no energy accumulation effect (bright room operation) and has obvious imaging power threshold (clear image edge and high contrast)

on the other hand, the change of physical state requires relatively high energy, and it is generally difficult to introduce a chain reaction mechanism (i.e., the so-called increase mechanism), so the sensitivity (sensitivity) is relatively low. At least the market scope of the automotive new material industry is expected to reach several trillion yuan, and the image exposure is generally more than hundreds of MJ/cm2, which is much higher than other imaging material systems; Such as optical crosslinking/optical modification (tens of MJ/cm2), photopolymerization (tens of J/cm2), silver salt and electrostatic photography system (several J/cm2), etc

in order to make up for the low sensitivity of the thermal imaging system, it is generally necessary to use high-power lasers above w/cm2 level to achieve the plate making speed required by practical applications, which is not a very favorable choice. From the perspective of development trend, in the field of off-line direct plate making, infrared thermal imaging system and ultraviolet photosensitive imaging system will certainly become the focus of competition and simulation test in the future

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