{!! Form::open([
    'url' => action('Admin\ReportsController@exportXls', Input::all()),
    'method' => 'POST'
]) !!}
    {!! Form::hidden('export', 'xls') !!}
    {!! Form::hidden('kind', $kind) !!}
    {!! Form::hidden('kind_name', $kind_name) !!}
    <div class="text-right">
        <button type="submit" class="btn btn-primary">
            <span class="glyphicon glyphicon-download"></span> Descargar excel
        </button>
    </div>
{!! Form::close() !!}