System and method for wavelength beam combination on a single laser emitter
First Claim
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1. A diode pump comprising:
- a single diode emitter emitting a single multi-mode beam, the multi-mode beam comprising a plurality of discrete wavelengths and having a beam size;
a portioning element configured to portion the multi-mode beam into a plurality of partitions, each partition comprising only one of the wavelengths of the multi-mode beam and having a partition size smaller than the beam size, the beam size substantially equaling a sum of the partition sizes;
a combining element configured to receive and converge each partition onto a dispersive element, wherein the dispersive element transmits the converged partitions; and
a partially-reflective output coupler arranged to receive the converged partitions from the dispersive element, to reflect a portion of the converged partitions toward the dispersive element, and to transmit an output beam having (i) the plurality of wavelengths and (ii) a size substantially equal to one of the partition sizes.
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Abstract
A system and method for reducing the M2 value of a single asymmetric laser emitter while maintaining the power output of the emitter. In some embodiments the brightness of the output of such a system is equivalent to a portioned section of the single laser emitter. A WBC step is performed along a portioned or non-portioned single laser emitter to reduce the M2 value.
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Citations
10 Claims
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1. A diode pump comprising:
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a single diode emitter emitting a single multi-mode beam, the multi-mode beam comprising a plurality of discrete wavelengths and having a beam size; a portioning element configured to portion the multi-mode beam into a plurality of partitions, each partition comprising only one of the wavelengths of the multi-mode beam and having a partition size smaller than the beam size, the beam size substantially equaling a sum of the partition sizes; a combining element configured to receive and converge each partition onto a dispersive element, wherein the dispersive element transmits the converged partitions; and a partially-reflective output coupler arranged to receive the converged partitions from the dispersive element, to reflect a portion of the converged partitions toward the dispersive element, and to transmit an output beam having (i) the plurality of wavelengths and (ii) a size substantially equal to one of the partition sizes. - View Dependent Claims (2, 3, 4, 5)
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6. A diode pump comprising:
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a single diode emitter emitting a single multi-mode beam, the multi-mode beam comprising a plurality of discrete wavelengths and having a beam width; a combining element configured to receive and converge only the single multi-mode beam along a first dimension onto a dispersive element, wherein the dispersive element transmits a reduced beam having a width less than the beam width; and a partially-reflective output coupler arranged to receive the reduced beam from the dispersive element, to reflect a portion of the reduced beam toward the dispersive element, and to transmit an output beam having (i) the plurality of wavelengths and (ii) an M2 value less than 3.
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7. A method for reducing the emission M2 value of a single diode emitter that emits a single multi-mode beam having (i) a plurality of discrete wavelengths, (ii) a first M2 value along a first dimension of the multi-mode beam, and (iii) a second M2 value along a second dimension of the multi-mode beam, the first M2 value being greater than the second M2 value, the method comprising:
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along the first dimension of the multi-mode beam; causing only the multi-mode beam to converge onto a dispersive element and be dispersed, thereby forming a dispersed beam, and transmitting the dispersed beam onto a partially reflective output coupler, thereby (i) causing a first portion of the dispersed beam to reflect back towards the dispersive element and into the single diode emitter, and (ii) transmitting a second portion of the dispersed beam through the partially reflective output coupler, the second portion of the dispersed beam having (a) the plurality of wavelengths and (b) an M2 value less than the first M2 value.
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8. A method for reducing the emission M2 value of a single diode emitter that emits a single multi-mode beam having (i) a plurality of discrete wavelengths, (ii) a first M2 value along a first dimension of the multi-mode beam, and (iii) a second M2 value along a second dimension of the multi-mode beam, the first M2 value being greater than the second M2 value, the method comprising:
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along the first dimension of the multi-mode beam; portioning the multi-mode beam into a plurality of partitions, each partition comprising only one of the wavelengths of the multi-mode beam and having a partition size smaller than the beam size, the beam size substantially equaling a sum of the partition sizes; causing the partitions to converge onto a dispersive element and be dispersed, thereby forming a plurality of dispersed beams, and transmitting the plurality of dispersed beams onto a partially reflective output coupler, thereby (i) causing a first portion of the plurality of dispersed beams to reflect back towards the dispersive element and into the single diode emitter, and (ii) transmitting a second portion of the plurality of dispersed beams through the partially reflective output coupler, the second portion of the plurality of dispersed beams constituting an output beam having (a) the plurality of wavelengths and (b) an M2 value less than the first M2 value. - View Dependent Claims (9, 10)
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Specification