Snippet para subir archivos via AJAX a laravel.

Ajax-load-files-laravel

<script>
            //Enviar el formulario via FormData
            var data = new FormData($('#form-nuevo')[0]);
            console.log(data);

            $.ajax( {
                url: myApp.url.rest+'sistema/imagen',
                type: 'POST',
                data: data,
                processData: false,
                contentType: false
            }).done(function(datos){
                console.log(datos);
            });
</script>



<?php
//Recuerda 

Route::post('/upload_file', function()
{
    $rules = array(
        'file' => 'required|mimes:doc,docx,pdf',
        );
    $validator = Validator::make(Input::all(), $rules);
    if($validator->fails())
    {
        //Enviar errores
    }
    else
    {
        if(Input::hasFile('file'))
        {
            $f = Input::file('file');
            $att = new Attachment;
            $att->name = $f->getClientOriginalName();
            $att->file = base64_encode(file_get_contents($f->getRealPath()));
            $att->mime = $f->getMimeType();
            $att->size = $f->getSize();
            $att->save();
            //Return success
        }
    }
});
?>