Open water release strategies for kokanee in Lake Roosevelt, 2003

PCT No. PCT/JP93/01718 Sec. 371 Date May 23, 1995 Sec. 102(e) Date May 23, 1995 PCT Filed Nov. 24, 1993 PCT Pub. No. WO94/12310 PCT Pub. Date Jun. 9, 1994A laser marking apparatus and method for laser marking workpieces to be marked, which are continuously fed without stopping the workpiece each time, thus raising production efficiency. Therefore, the laser marking apparatus comprises a laser oscillator (1); a first polarizer (3) for polarizing a laser beam from the laser oscillator (1) and raster-scanning the laser beam; a mask (6) capable of displaying a specified pattern which selects the laser beam to be raster-scanned by the first polarizer (3) and admits the laser beam to pass therethrough; and a second polarizer (9) for further polarizing the raster-scanned laser beam which has passed through the mask (6) and irradiating the pattern onto a surface of a workpiece to be marked, the second polarizer (9) being provided with a reflection mirror (10) for reflecting the laser beam which has passed through the mask (6), and a movable lens (13) for receiving the laser beam from the reflection mirror and irradiating the laser beam onto the workpiece (8) to be marked, the movable lens (13) being mounted on a moving mechanism (15). The laser beam is irradiated to perform marking on the workpiece (8) while moving the movable lens (13) in synchronism with the workpiece (8).