In this paper, the physical model of the coherent polarization beam combination (CPBC) system is established by using Jones-matrix mathematics, and then the coherent-adding mechanisms between the sub-beams in temporal, spatial and spectral domains are analyzed. The intrinsic relationship between optical-field coherence decay and beam misalignment is established from temporal domain (optical-path deviation, phase-locking residual), spatial domain (beam-pointing deviation, spot-overlapping deviation, spot-width error) and spectral domain (B-integral imbalance, dispersion imbalance, central-wavelength drift, spectrum-width error) respectively. Furthermore, the dependence between the combining efficiency and the individual experimentally-measurable misalignment is quantified using numerical simulation, and the error tolerance of the each factor is calibrated separately for efficient combination, which provides quantitative guidance for the practical system. The results of this paper can be applied to the analysis of cascade extended array CPBC system after proper mathematical extension. In addition, this study also provides a feasible quantitative analysis method for the degradation of optical-field coherence between coherent beams, which can be applied to other research fields that require optical coherence management.
We demonstrate the output of femtosecond (fs) green and ultraviolet (UV) lasers through second-harmonic generation using type-I phase-matched K3B6O10Br (KBOB) nonlinear optical (NLO) crystals. The wavelengths of the fs green and UV lasers are 515 and 400 nm, respectively. The 1030-nm fs laser is used to pump the KBOB crystal to generate the green output. When the laser pump power reached 880 mW with a repetition rate of 1 kHz, an output power of 235 mW was obtained from the green laser with an optical conversion efficiency of 26.7%. When a pump power of 5.87 W was attained with repetition rate of 10 kHz, a green output power of 1.03 W was generated. The fs UV laser is pumped by an 800-nm fs laser, with 132-mW output power achieved when the pump power was 470 mW with an optical conversion efficiency of 28.1%. The experimental results indicate that the KBOB crystal is a promising NLO crystal for generating fs green and UV lasers because of its excellent NLO properties.
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