Open an application page using pop up window..

Open an application page using pop up window..

function AddTopics() {
        var options = {
            width: 500,
            height: 320,
            url: /applicationpage.aspx, //Here your application page url
            title: "Manage Meeting Topics"
        };
        SP.UI.ModalDialog.showModalDialog(options);
        return false;

    }

This will help you to work with pop up window