Phase　locking　of　the　output　beam　and　in-phase　mode　selection　with　the　amplitude　compensator　at　a　high　injection　current　were　achieved　experimentally　by　a　quarter-Talbot　cavity.　The　linear　array　used　in　the　experiment　consisted　of　49　wide-aperture　diodes　with　a　diode　width　of　a=100　mu　m　and　a　spacing　period　of　d=200　mu　m.　Increasing　output　beam　intensity　in　the　far-field　central　lobe　was　demonstrated,　and　1.46　W　of　output　power　distributed　on　the　multilobes　was　concentrated　on　the　single　lobe　and　changed　to　0.92　W　by　the　amplitude　compensator.　The　far-field　divergence　of　the　phase-locked　beam　was　1.69　mrad,　and　the　spectral　full　width　at　half　maximum　of　the　output　beam　was　suppressed　from　1.7　to　0.13　nm.　(c)　2006　American　Institute　of　Physics.