The　output　performance　characteristics　of　all-solid-state　lasers　end-pumped　by　a　diode　laser　have　been　theoretically　analyzed.　Furthermore,　the　optic　properties　of　laser　crystals　and　nonlinear　optical　materials　employed　in　all-solid-state　lasers　have　been　studied　and　compared　by　computer　numerical　simulation.　The　theoretical　analysis　and　numerical　simulation　of　optical　parameters　of　laser-diode-end-pumped　Nd:YVO4　and　Nd:YAG　lasers　were　carried　out　on　the　basis　of　theory　of　crystal　level　structure　and　rate　equation.　The　good　output　properties　of　high　efficiency　Nd:YVO4　Solid-state　laser　end-pumped　by　a　diode　laser　are　superior　to　of　Nd:YAG　compared　in　the　same　conditions.　Therefore,　Nd:YVO4　crystal　has　been　demonstrated　as　an　ideal　laser　gain　medium　in　solid-state　lasers　with　account　of　its　high　laser　gain　and　low　pump　threshold,　etc.　The　conversion　efficiency　of　40%　of　Nd:YVO4　crystal　has　been　presented　with　ail　input　pump　power　of　15W　and　a　crystal　length　of　1mm.　Furthermore,　on　the　basis　of　phase-matching　for　the　nonlinear　optical　crystal,　the　angular　tuning　curves　of　KTiOAsO4　and　RbTiOAsO4　crystals　for　type-I　and　type-II　phase-matching　have　been　simulated　by　computer,　respectively.　The　tunable　wavelengths　of　RbTiOASO(4)　crystal　from　1.320　mu　m　to　5.484　mu　m　in　type-1,　from　1.324　mu　m　to　5.424　mu　m　in　type-II　were　both　wider　than　that　of　KTiOAsO4　crystal　in　the　mid-infrared　bandwidth.　Therefore.　RbTiOAsO4　crystal　is　an　excellent　nonlinear　optical　crystal　of　which　tuning　range　is　wider　than　that　of　KTiOAsO4　crystal　in　the　mid-infrared　band.　As　new　crystals,　the　emerging　of　RTA　and　KTA　has　shown　a　promise　for　nonlinear　frequency　generation　throughout　the　1-5　mu　m　spectral　region.　Consequently,　all-solid-state　lasers　capable　of　generating　high　quality　near　mid　-infrared　light　have　strong　use　value.