In this research. a 1064 nm single-longitudinal-mode (SLM) vortex beam was generated from an annular-pumped Nd:YVO _4 microchip laser. in which a circular Dammann grating was used to reshape the 808 nm pump light into an annular intensity profile. As a result. https://fitnessgravesyardes.shop/product-category/reset-switch/