The present invention discloses the use of ion implant recipe changes to control the effective channel length by compensating for any variation in the gate electrode width. CW light from a CW laser light source is input into an electroabsorption modulator to which a sine wave electrical signal is applied. Sections or joints of casing formed from the steel alloy may be installed within a wellbore and radially expanded during completion of the wellbore. The displacement of the piston is caused by the alternating introduction of pressurizing fluid into separate actuation chambers.