The　maximal　tolerance　parameters　of　poling　period　and　phase-matching,　temperature　in　second　harmonic　generation　(SHG)　using　periodically　poled　RbTiOAsO4(PPRTA)　as　a　function　of　the　fundamental　wavelength　are　investigated　theoretically.　The　tolerance　of　the　poling　period　Lambda　A　of　PPRTA　is　found　larger　than　that　of　PPLN　and　PPKTP　when　the　fundamental　wavelength　is　beyond　2　mu　m,　which　reaches　its　maximum　Delta　Lambda(max)　for　PPRTA　at　a　fundamental　wavelength　of　2.7433　mu　m.　However,　the　tolerance　for　the　phase-matching　temperature　Delta　T　of　PPRTA　is　found　smaller　than　that　of　PPLN　and　PPKTP　with　an　exception　that　PPRTA　has　a　larger　tolerance　of　the　temperature　or　a　larger　temperature　phase-matching　bandwidth　at　fundamental　wavelength　of　2.2474　mu　m,　where　the　maximum　of　Delta　T(Delta　T-max)　is　obtained.　Furthermore,　the　tuning　characteristics　of　the　optical　parametric　processes　using　PPRTA　for　collinear　quasi-phase-matching　(CQPM)　is　analyzed.　The　combination　of　temperature　tuning　and　poling　period　tuning　enables　a　quasi-continuous　wavelength　tuning　range　of　1493.2-1593.7　nm　for　the　signal　and　3201.8-3699.2　nm　for　the　idler,　where　poling　period　of　39　mu　m,　39.5　mu　m　and　40　mu　m　and　a　temperature　between　20　and　120　degrees　have　been　employed　in　the　corresponding　theoretical　analysis.　(C)　2009　Elsevier　B.V.　All　rights　reserved.