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We demonstrated a high average power, high beam quality, narrow linewidth, quasicontinuous wave (QCW) diode-pumped 1064-nm Nd:YAG amplifier. A narrow-linewidth QCW pulse Nd:YAG oscillator was employed as the seed laser, providing a maximum average power of 53.4 W at a pulse repetition frequency of 500 Hz and pulse width of 108 μ s with a beam quality factor M2 = 1.21. After that, a two-stage double-pass...
Periodic arrays of subwavelength apertures on Ag film are used as the substrates for nanohole-enhanced Raman spectroscopy. This study presents a rectangular bull's eye structure in an array. We demonstrate the quantitative features of the pattern by the finite-difference time-domain method. This structure is used to enhance the Raman spectroscopy of four DNA bases without labeling. The enhancement...
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