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If there is no link between base_link and Laser in the TF tree, then you need to publish your own static transform using the static transform publisher in TF.

To test this, try a transform publisher which places the laser 0.3 metres above the base_link:

rosrun tf static_transform_publisher 0 0 0.3 0 0 0 base_link Laser 100

The arguments are:x y z yaw pitch roll frame_id child_frame_id period_in_ms. If this works, it can be added to your launch file.