Qinglei Ma

• PhD at University of Nebraska–Lincoln

This chapter focuses on the biological applications of optical-resolution photoacoustic Microscopy (OR-PAM) system in brain in vivo label-free imaging. The OR-PAM system is mainly composed of photoacoustic (PA) imaging system and laser source. The solid-state nanosecond laser is widely used as the pumping source to generate efficient signal for PA...

A model is developed to calculate the optimal pump position for end-pump configuration. The 808 nm wing pump is employed to spread the absorption inside the crystal. By the optimal laser cavity design, a high-energy high-efficiency Nd:YLF laser operating at 1053 nm is presented. In cw operation, a 13.6 W power is obtained with a slope efficiency of...

WSe 2 films have been fabricated using a low-temperature, two-step method involving the reaction of W(CO) 6 and elemental selenium in refluxing (110 ° C) toluene to form a nanocrystalline precursor consisting of amorphous tungsten and trigonal crystalline selenium. Drop cast or airbrush-deposited films of this precursor were annealed in an argon at...

An excellent candidate for an earth abundant absorber material is tungsten selenide (WSe2) which can be directly grown as a p-type semiconductor with a band gap value that matches well the solar spectrum. Although several fabrication methods were reported, further improvement is highly needed to make high quality WSe2 films. In addition, the numeri...

An excellent candidate for an earth abundant absorber material is WSe2 which can be directly grown as a p-type semiconductor with a band gap near 1.4 eV. In this work we present the structural, optical, and electrical properties of thin film WSe2 grown via the selenization of sputter deposited tungsten films. We will show that highly textured films...