A slab laser amplifier with parasitic oscillation suppression has a plurality of angled pump faces related to one another in order to decrease likelihood of parasitic oscillations, with internal beam incidence angles at total internal reflection that alleviate need for reflective coatings. Two molding shells and a closure member form a mold with a molding cavity. The matrix code reader may obtain the user information andor the instruction to perform the social networking service function from information included in the matrix code, from a non-transitory storage medium of the matrix code reader, from a user, and so on. The interior is preferably lined with removable padding, such as gel packs, visco-elastic material in order to apply light pressure to the hand and stabilize the position of surgical device on the hand.