1. A laser diode apparatus comprising:
a mounting block;
a plurality of diode lasers, each mounted to said mounting block and each capable of emitting a respective diode laser beam; and
a plurality of mirrors each for providing slow axis collimation and reflective direction of an incident corresponding one diode laser beam, each one of said plurality of mirrors optically coupled to at least one respective diode laser of said plurality of diode lasers and optically oriented therewith so as to be capable of reflectively providing the diode laser beams in a stacked arrangement;
wherein each of said mirrors is capable of providing slow axis and fast axis pointing correction of the respective diode laser beams via rotation, displacement, or rotation and displacement of said each mirror with respect to one or more axes associated therewith or associated with the respective diode laser beams.
2. The apparatus of claim 1 wherein each of said mirrors is made with two curved spherical or aspherical surfaces, providing three effective surfaces for spherical and comatic aberration correction.
3. The apparatus of claim 1 wherein each of said mirrors includes a highly reflective front surface.
4. The apparatus of claim 1 wherein each of said mirrors includes a front surface having an aspheric shape.
5. The apparatus of claim 1 wherein the stacked arrangement is aligned with a fast axis of the diode laser beams such that the laser beams point in the same direction in the fast axis.
6. The apparatus of claim 1 wherein said mounting block includes a plurality of adjacent flat mounting surfaces wherein each corresponding one of said plurality of diode lasers is mounted thereon, each one mounting surface of said plurality of mounting surfaces being vertically stepped with respect to each one adjacent mounting surface in a direction laterally perpendicular to the emission direction of said plurality of diode lasers.
7. The apparatus of claim 6 wherein the stacked arrangement of diode laser beams has a beam order corresponding to the order of said plurality of diode lasers mounted to said plurality of mounting surfaces.
8. The apparatus of claim 1 wherein said mounting block is heat dissipative.
9. The apparatus of claim 1 wherein each of said mirrors is cylindrical.
10. The apparatus of claim 1 wherein each of said mirrors is aspheric.
11. The apparatus of claim 1 further comprising:
a housing, including a bottom housing mounting surface;
wherein said mounting block is mounted to said bottom housing mounting surface, and;
wherein said plurality of mirrors is mounted to said bottom housing mounting surface.
12. The apparatus of claim 1 further comprising a plurality of fast axis collimators each optically coupled to a corresponding one of said plurality of diode lasers.
13. The apparatus of claim 1 further comprising a focusing optic for focusing the stacked arrangement of diode laser beams.
14. The apparatus of claim 13 further comprising a module output optically coupled to said focusing optic, wherein the stacked arrangement of diode laser beams is capable of becoming focused into said module output.
15. The apparatus of claim 14 wherein said module output is an optical fiber, a beam homogenization rod, beam homogenization optics, or free-space beam delivery optics.
16. The apparatus of claim 1 wherein said plurality of mirrors provides correction for off-axis aberrations.
17. A laser diode apparatus comprising:
a mounting block;
a plurality of diode lasers, each mounted to said mounting block and each capable of emitting a respective diode laser beam; and
a plurality of mirrors each for providing slow axis collimation and reflective direction of an incident corresponding one diode laser beam, each one of said plurality of mirrors optically coupled to at least one respective diode laser of said plurality of diode lasers and optically oriented therewith so as to be capable of reflectively providing the diode laser beams in a stacked arrangement;
wherein each of said mirrors includes an anti-reflective front surface and a highly reflective back-surface and an interior propagation region.
18. A laser diode apparatus comprising:
a mounting block;
a plurality of diode lasers, each mounted to said mounting block and each capable of emitting a respective diode laser beam; and
a plurality of mirrors each for providing slow axis collimation and reflective direction of an incident corresponding one diode laser beam, each one of said plurality of mirrors optically coupled to at least one respective diode laser of said plurality of diode lasers and optically oriented therewith so as to be capable of reflectively providing the diode laser beams in a stacked arrangement;
wherein each of said mirrors includes two cylindrical cuts defining a front surface and said reflective back surface, said front surface including one or more anti-reflection coatings applied thereto, said reflective back surface including one or more high reflection coatings applied thereto, and wherein said anti-reflection and high reflection coatings significantly reduce optical aberrations.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A digital watermark detection apparatus to detect the watermark information from an input image signal, comprising:
a first transformation unit configured to obtain an orthogonal transformation image signal by subjecting one of an input image signal embedded with watermark information and a first accumulated signal obtained by accumulating the input image signal over a period of time to orthogonal transformation;
a scaling unit configured to generate a scaled image signal by scaling the orthogonal transformation image signal;
a complex addition unit configured to produce a complex addition signal by subjecting the orthogonal transformation image signal and the scaled image signal to complex addition;
a second transformation unit configured to produce a transformation complex addition signal by subjecting the complex addition signal to orthogonal transformation or inverse orthogonal transformation; and
an estimation unit configured to estimate the watermark information based on a peak which appears at one of the transformation complex addition signal and a second accumulated signal obtained by accumulating the transformation complex addition signal over a period.
2. A digital watermark detection apparatus according to claim 1, further comprising a signal generation unit configured to generate the second accumulated signal by normalizing an amplitude of the transformation complex addition signal and accumulating the transformation complex addition signal having the normalized amplitude.
3. A digital watermark detection apparatus according to claim 1, which further comprises a division unit configured to divide the input image signal into at least two divided signals, and wherein the scaling unit scales the input image signal for each of the divided image signals.
4. A digital watermark detection apparatus according to claim 1, which further comprises a division unit configured to divide the input image signal into at least two divided signals, and wherein the first transformation unit subjects the input image signal for each of the divided image signals to orthogonal transformation.
5. A digital watermark detection apparatus according to claim 1, wherein the estimation unit estimates the watermark information by determining a level of the peak in accordance with a threshold value changing according to an accumulation period of the second accumulated signal.
6. A digital watermark detection apparatus according to claim 1, wherein the estimation unit detects the watermark information by at least first and second detection methods, and determining the watermark information when detection results given by the first and second detection methods coincide with each other.
7. A digital watermark detection apparatus according to claim 1, wherein the estimation unit estimates the watermark information by determining a polarity of the peak.
8. A digital watermark detection apparatus according to claim 1, which further comprises a pixel skipping unit configured to carry out pixel skipping of pixels of the input image signal, and wherein the scaling unit scales an input image signal obtained by the pixel skipping.
9. A digital watermark detection apparatus according to claim 1, which further comprises a pixel skipping unit configured to carry out pixel skipping of pixels of the input image signal, and wherein the first transformation unit subjects an input image signal obtained by the pixel skipping to orthogonal transformation.
10. A digital watermark detection apparatus according to claim 1, wherein the complex addition unit carries out the complex addition by compressing amplitude of the orthogonal transformation image signal.
11. A digital watermark detection apparatus according to claim 1, which further comprises an extraction unit configured to extract a specific frequency component arranged in a pre-stage of the scaling unit or a post-stage thereof.