Always hate to answer a question with a question, but sometimes it helps..
Why would you want to do that & what does it get you??
Laminate has a stain proof surface and the Polyurethane wont stick long term, My belief & experience is that what you propose wont work..
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Yes you can, however, ensure that this is the best option before executing. I do this to reinforce the self-stick vinyl tile and laminate flooring in my basement and it works great. I got tired of dropping a knife or something creating a huge gash requiring replacement. The polyurethane layer has protected my floors for years. Occasional reapplication of polyurethane in spots where needed making it look new brand new again versus cutting out and re-sticking a piece of the laminate floor that will never look as good as new...I use the former. There are a lot of nay-sayers out there about polyurethane on vinyl tiles and laminate floors, but I've always had great success.
Polyurethane will give a long lasting easy to apply finish. Use a water based polyurethane ans clean up will be much easier. You should get years of wear from a good polyurethane finish.
Pergo flooring is considered to be some of the best available.
Floors can be made of a number of materials, such as hardwood, stone, ceramic tiles, plywood covered with carpet or laminated or veneer tiles. In homes with concrete foundations the floors are concrete, but are covered with carpet, laminate, or tiles.
Laminate floors are manufactured, a thin layer of wood or Formica is glued to a backer. The surface is only about 1/16th of an inch thick and the whole board is about 3/8 inch thick. Hardwood floors are all wood and 5/8 to 3/4 inch thick. Oak is the most common but there are many different types of wood available. They can be sanded and refinished several times over a long period of time. Laminate can not be sanded and had a hard factory coating that resists staining more than hardwood.