Uniformity adjustment method for a diode-laser line-projector
In a line projector a diode-laser beam having an elliptical cross-section is projected onto a Powell lens which spreads the beam to form a line of light. Distribution of power along the line of light is adjusted by rotating the diode-laser beam with respect to the Powell lens.
1. A diode laser line projector device comprising:
an elongated housing having first and second sections, said sections being rotatable with respect to each other along the longitudinal axis of the housing;
a diode laser mounted within the first section of the housing, said diode laser generating a beam of radiation having orthogonal fast and slow axes mutually perpendicular to the longitudinal axis of the housing;
a first lens mounted within the second section of the housing, said first lens having an acylindrical surface including a vertex lying along a first axis perpendicular to the longitudinal axis the housing; and
means for selectively locking the first and second sections of the housing together to prevent rotation after the vertex of the acylindrical surface of the first lens has been preferentially aligned with respect to the axes of the diode laser.
2. A device as recited in claim 1 wherein said locking means is defined by set screws extending through a wall of the housing.
3. A device as recited in claim 1 wherein said first lens is a Powell lens.
4. A device as recited in claim 1 further including a second lens mounted in the housing and positioned between the diode laser and the first lens.
5. A device as recited in claim 4 wherein said housing further includes a means for adjusting the spacing between the second lens and the diode laser.
6. A diode laser line projector device comprising:
an elongated housing having a longitudinal axis;
a diode laser mounted within the housing, said diode laser generating a beam of radiation having orthogonal fast and slow axes mutually perpendicular to the longitudinal axis of the housing; and
a first lens mounted within the housing and spaced from the diode laser for projecting the beam of radiation generated therefrom along a line, said first lens having an acylindrical surface including a vertex lying along a first axis perpendicular to the longitudinal axis the housing and aligned between the fast and slow axes of the diode laser at a position so that the uniformity of the intensity distribution of light along the projected line is greater than 80 percent.
7. A device as recited in claim 6 wherein said first lens is a Powell lens.
8. A device as recited in claim 6 further including a second lens mounted in the housing and positioned between the diode laser and the first lens.
9. A device as recited in claim 8 wherein said housing further includes a means for adjusting the spacing between the second lens and the diode laser.