Abstract
Coherent combination of laser beam is an important and challenging area of high power laser science. And how to evaluate the high power laser by coherent beam combination is a new research spot. Formulas for the radiated intensity distributions of coherent combined Gaussian beam array are derived via Fraunhofer scalar diffraction model by utilizing representations of the cross-spectral density of the far field. Effects of beam array numbers and separate distances etc. on far field radiated profiles are shown and analyzed. A new conception named power in the bucket of the main lobe (PIMm) is advanced to measure the beam quality of combined beams. This evaluation method is useful for efficiently determining the peak irradiance and power in the bucket for single emitting apertures of general shape.
Highlights
Achieving high optical power and high brightness has always been the major goals in the development of laser technologies
What we consider is the relative distribution of light intensity on far field, so we investigated the sensitive factors of array arrangement, coherence degree factor and the laser beam number which may influence the far field intensity distribution pattern
We have presented formulas for the radiated intensity distributions of coherent combined Gaussian beam array via Fraunhofer scalar diffraction model
Summary
Achieving high optical power and high brightness has always been the major goals in the development of laser technologies. Beam quality and divergence angle of laser arrays in the far field have been investigated, and how to evaluate the high power laser by coherent beam combination is a new research hotspot [1] [2]. In this paper, based on the representations of the cross-spectral density of the far field, the radiated intensity distributions of coherent and incoherent combined Gaussian laser arrays are formulated and depicted. PIBm is the ratio of the power in the main lobe to the total power of the array in the far filed intensity distribution. On this basis, a new conception is advanced to measure the beam quality of combined beams
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