Abstract
For the paper, experimental studies were performed on the damage of the Ge- and Si-based flat window by lasers out-of-band. The experimental results showed that lasers out-of-band can cause film damage and substrate damage to Ge and Si windows. The high-energy laser damage window mechanism mainly manifested as thermal effects. The composite laser damage thresholds for the substrate were an Si window of 21.6 J/cm2 and a Ge window of 3 J/cm2. Compared with continuous laser and long pulse laser experimental results, it was found that the use of long pulse-continuous composite constitution could effectively reduce the damage threshold. Compared to the long-pulse laser, the composite laser could achieve similar damage effects with a smaller energy density.
Highlights
Laser-induced damage to optical components is a key research issue in high-energy laser emission systems, and it is one of the key technologies that need to be resolved for the development of high-power optoelectronic countermeasure systems
Starting from the basic principle of the interaction between lasers and matter, a laser can interact with optical systems and optical elements through the laser thermal effect and laser–electron interactions
Researchers generally believe that the damage mechanism of “in-band damage” comprises the semiconductor band structure theory, thermoelectric effect, etc., and “in-band damage” has been widely used in contemporary optoelectronic countermeasures
Summary
Laser-induced damage to optical components is a key research issue in high-energy laser emission systems, and it is one of the key technologies that need to be resolved for the development of high-power optoelectronic countermeasure systems. Starting from the basic principle of the interaction between lasers and matter, a laser can interact with optical systems and optical elements through the laser thermal effect and laser–electron interactions This provides a theoretical basis for a single-band laser to achieve full-band photoelectric loading. Some researchers have found that out-of-band lasers can damage window mirrors in experiments of laser interference effects on optical systems. Existing research believes that the key to “out-band damage” lies in whether the laser source has a sufficient damage ability, and the multi-mode composite laser has this characteristic. A multi-mode composite laser consists of lasers with different wavelengths, different systems, and different frequency changes that act on the target at the same time or alternately to obtain a better damage effect than a single continuous-wave or Pulsed-laser. Si-based flat window to provide technical support for the design of high-power laser emission systems
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