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Being the most active field in modern physics, Optical Physics has developed many new branches and interdisciplinary fields overlapping with various classical disciplines. This series summarizes the advancements of optical physics in the past twenty years in the following fields: High Field Laser Physics, Precision Laser Spectroscopy, Nonlinear Optics, Nanophotonics, Quantum Optics, Ultrafast Optics, Condensed Matter Optics, and Molecular Biophotonics.

The theme of this book is the spectral properties of graphs. The book is divided into four chapters. Chapter 1 presents some basic terminologies and notations. Chapter 2 devotes to hyperenergetic graphs and the largest eigenvalue of non-regular graphs associated with the spectrum of graphs. Chapter 3 provides some results on the Laplacian spectrum of graphs, included Laplacian spread, Laplacian spectral ratio, Laplacian-energy-like, Kirchhoff index and the sum of Laplacian eigenvalues. The separator, spread and spectral radius on signless Laplacian spectrum of graphs are studied in Chapter...