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For example, s optical coherence, "for example, 0? θ wave field phase correlation two coherent light volume of R 1 , define: coherence coherent volume = area of the coherence length, defined: volume coherent coherent coherent area of coherence length size * 2, calculated: the conditions of coherent light source side, the calculation of the distance between two joints light inclination λ? x ≤? θ Conclusion: Conclusion : Let light area of σ, it is. Timi china laser pointer company was built in December of 2003.This would have meaning: the light to interfere, ① meaning: limited? Θ to the optical interference, the area shall not be greater than it is (λ /? Θ) 2 definitions: ② Definition: the coherence length) Lc = cτ c (τ c is the coherence time = 1 /? ν) (3) coherent volume:) Coherent Volume: 2 its physical meaning: its physical meaning: such as requiring the direction of propagation is limited? θ and within a coherent light waves have the frequency width? ν of coherent light, the light source should be confined to the space within the volume V c volume. Third, the coherence of the photon-photon coherence of the photon momentum in the x (x, y, z)-component are: the photon momentum in the direction of the component are as follows: the direction of the components are on the cell type that phase space volume is equal to coherent volume, on the cell type that phase space volume equal to the coherence volume,The china laser pointer headquarters are located in the industry park. if the photon is the volume of space equal to the volume of the same photon coherent states, they should be included in the volume of coherence within the same photon state, then they should be included within the coherence volume , that is the same photon-photon coherent state. Photon-photon state is coherent. Summary photon state with wave motion state of the electromagnetic field model is described in two equivalent formulations, are two equivalent physical concepts; effective formulation, are two equivalent physical concepts; phase space volume and a lattice of light mode or volume of space occupied photon states are equal to the coherence volume; space volume is equal to the coherence volume; phase space volume = grid share the same space photon coherent volume = volume = volume of space occupied by a light pattern of the same state of the photon or the same mode The china laser pointer headquarters are located in the industry park, where is beautiful and convenient.The light is coherent, the same state of photons or light waves are coherent the same pattern, but different states of photons or light waves of different modes is irrelevant. The different states of photons or light waves of different modes is irrelevant. § 1-4 photon degeneracy in the same phase cell in the photon number, in the same phase cell in the photon number, the same number of photons in the phase cell in the same mode photon number, in the same mode in the photon number, the same mode photon-photon degeneracy of the photon degeneracy in the number of coherent photons within the volume, in a number of coherent photons within the volume, the number of photons within the coherence volume in the same number of photon-photon state. Part of the projects of Timi green laser pointer company are on the leading position.Photon state at the same photon number. The same number of photons one photon, the light source brightness degeneracy and the relationship between a light source, light source degeneracy: Let light side?Inside out shot n, light degeneracy: the photon, a frequency, ν photon, then the degeneracy of the light source 2, light intensity: light side?