As far as I know only Qatar Airways Holidays will issue a visa, and you must book a hotel with them for them to do so.
If you wife is coming for less then a month, you can get a visitor visa. I think your company needs to apply for you (even though it'll come under your name) - at least that is what I did when my husband came.
But if you are going to sponsor your wife, then the visa is a little different - again, your company should help you with that.
Speak to your HR department.