System and method for combining laser arrays for digital outputs
Embodiments comprise a device that can efficiently produce a highly resolved intensity profile that can be easily switched to various specific configurations with binary word strings defining output intensities that after summation will be combined to form a single colors intensity depth. Arraying these devices allows an image line of single color pixels to be efficiently produced without gross scintillation effects. The non-coherent output is desirable in this application as it reduces scintillation effects on the screen or final image.
1. A system for combining the output of a plurality of semiconductor light devices to generate a digital output, comprising:
a first set of semiconductor light devices among the plurality of semiconductor light devices and operable to generate a plurality of first wavelengths, the first set of semiconductor light devices grouped in a first shape within at least one array of one or more sub-arrays;
a first binary string containing digital output data, each bit from the first binary string controlling a power of each sub-array from the one or more sub-arrays, wherein a wavelength intensity generated by each sub-array is determined by a position of a particular bit controlling each sub-array; and
a first beam combiner combining the plurality of first wavelengths to generate a first wavelength beam representative of the digital output.
2. The system as recited in claim 1 , further comprising:
a second set of semiconductor light devices among the plurality of semiconductor light devices and operable to generate a plurality of second wavelengths, the second set of semiconductor light devices grouped in a second shape within at least one second array of one or more second sub-arrays;
a second binary string containing second digital output data, each bit from the second binary string controlling a power of each second sub-array from the one or more second sub-arrays, wherein a second wavelength intensity generated by each second sub-array is determined by the position of the particular bit controlling each second sub-array;
a second beam combiner combining the plurality of second wavelengths to generate a second wavelength beam; and
a non-coherent beam combiner combining the first wavelength beam and a second wavelength beam to generate a plurality of data points corresponding to the digital output.
3. The system as recited in claim 1 , wherein the plurality of semiconductor light devices is selected from the group consisting of a top emitting vertical-cavity surface emitting laser (VCSEL), a bottom emitting VCSEL, a top emitting VCSEL with external cavities (VECSEL), and a bottom emitting VECSEL.
4. The system as recited in claim 1 , wherein the plurality of semiconductor light devices is selected from the group consisting of a light-emitting diode, an edge emitting laser, an organic light-emitting diode, an optically pumped light source, and an electrically pumped light source.
5. The system as recited in claim 1 , wherein a most significant bit sub-array among the one or more sub-arrays has a larger number of semiconductor light devices than a least significant bit array among the one or more sub-arrays.
6. The system as recited in claim 1 , wherein each semiconductor light device within a most significant bit sub-array among the one or more sub-arrays has a larger aperture size than each semiconductor light device within a least significant bit sub-array among the one or more sub-arrays.
7. The system as recited in claim 1 , wherein semiconductor light devices within a sub-array are connected in parallel and are driven by a single connection.
8. The system as recited in claim 7 , wherein the single connection acts as a thermal management heat sink for the semiconductor light devices within the sub-array.
9. The system as recited in claim 1 , wherein semiconductor light devices within a sub-array among the one or more sub-arrays have equal aperture sizes.
10. The system as recited in claim 1 , wherein the first shape is linear, wherein a first subset of semiconductor light devices within a sub-array among the one or more sub-arrays is arranged on a first row within the sub-array, and wherein a second subset of semiconductor light devices within the sub-array are arranged on a second row within the sub-array.
11. The system as recited in claim 1 , further comprising a ground plane substantially surrounding semiconductor light devices within a sub-array among the one or more sub-arrays and forming a coplanar waveguide lead.
12. The system as recited in claim 1 , wherein the first shape is linear, wherein the at least one array is arranged horizontally forming a first row, further comprising a plurality of linear arrays arranged horizontally and forming a plurality of rows beneath the first row.
13. The system as recited in claim 1 , wherein the first shape is linear, wherein the at least one array is arranged vertically forming a first column, further comprising a plurality of linear arrays arranged vertically and forming a plurality of columns adjoining the first column.
14. The system as recited in claim 1 , wherein the plurality of semiconductor light devices are vertical-cavity emitting lasers, further comprising one or more optical elements for converting the first wavelength beam to a frequency doubled wavelength, the one or more optical elements selected from the group comprising of a non-linear crystal, a beam splitter, a polarizing beam splitter, a wavelength filter, a reflector, a lens, a mirror, and an etalon.