Hydroxyapatite (Ha) is a bioceramic widely employed to produce implants and prosthesis due to its biocompatibility characteristics. Usually as thin layer, many techniques such as HVOF, Pulsed Laser Deposition (PLD) and electrochemical deposition process (EDP) may be employed to obtain these layers but, in all cases, the adhesion of Ha layers, homogeneity and porosity are not well optimized for applications. To improve these properties, ion implantation was carried out in order to (i) improve the density of the porous ceramic film and to (ii) modify the layer-substrate interface. In this work, Ha layers (750 and 1450 nm thick) are obtained by PLD on Ti6Al4V. After deposition, Ha coatings were implanted with 760 KeV ¹⁵N⁺ ions with different doses ranging from 5.10¹⁵ to 2.10¹⁶ ions/cm². The characterization of these implanted layers is carried out by RBS and NRA to obtain the Ca/P ratio and to determine with accuracy the concentration distribution of implanted ions, respectively. Dramatic roughness modifications of surface coatings are observed using AFM as a function of the implanted dose. Such modifications are not directly related to the studied domain of layers thickness. At least, evolution of mechanical properties as a function of implanted dose is achieved by nanoindentation techniques, illustrating an increase of hardness and elastic modulus until a dose of 1.10¹⁶ ions/cm².