Study on energy loss compensation of back scattering conical cavity high-energy laser energy meter
2009
Because absolute quantity thermal laser energy meter based on conical cavity has some features, for example, wide
wavelength adaptation range, high laser damage threshold value, extensive measuring energy range and so on, it is often
used as the standard of high-energy laser energy meter, and is used extensively in the domain of high energy laser
measurement. But, laser energy will lose because of back scattering of conical absorption cavity. So, only after the loss is
compensated and amended, exact measurement of laser energy can be achieved. Aiming at energy loss compensation
problem of conical cavity high-energy laser energy meter, we firstly, according to speckle statistics optical theory,
analyze the back scattering of the conical absorption cavity in condition of uniform distribution laser incident on diffuse
reflection surface, and secondly, we aim at high power laser's output facula shape: round, based on optical principles of
interaction of the conical cavity inner face and the incident laser and utilize complexfication Simpson numerical method,
the mathematical models of optical power density distribution at open-end of conical cavity and back scattering gross
power are established. On this basis, the measured result is compensated and amended. The back scattering energy loss is
about 0.5% to 2.5%.High-energy laser energy measuring accuracy is improved effectively.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
0
References
0
Citations
NaN
KQI