Method and system for powering and cooling semiconductor lasers
View Patent ↗A semiconductor laser system includes a diode laser tile. The diode laser tile includes a mounting fixture having a first side and a second side opposing the first side and an array of semiconductor laser pumps coupled to the first side of the mounting fixture. The semiconductor laser system also includes an electrical pulse generator thermally coupled to the diode bar and a cooling member thermally coupled to the diode bar and the electrical pulse generator.
1. A semiconductor laser system comprising:
a diode laser tile comprising:
a mounting fixture having a first side, a second side opposing and positioned below the first side, and a plurality of third sides extending between the first side and the second side; and
an array of semiconductor laser pumps coupled to the first side of the mounting fixture;
an electrical pulse generator coupled to the second side of the mounting fixture below the array of semiconductor laser pumps and thermally coupled to the diode laser tile; and
a cooling structure having a base and a set of sides extending from the base to form an opening, each of the set of sides having opposing indentations, wherein:
the electrical pulse generator is mounted to the base of the cooling structure, and
the plurality of third sides of the mounting fixture are positioned in the opening, above the base, and between the set of sides of the cooling structure with each of the plurality of third sides of the mounting fixture making contact with and fit between the opposing indentations in one of the set of sides of the cooling structure, wherein the cooling structure is thermally coupled to the diode laser tile and the electrical pulse generator.
2. The semiconductor laser system of claim 1 wherein the mounting fixture comprises a shelf extending over a lower portion of the mounting fixture.
3. The semiconductor laser system of claim 2 wherein further comprising electrical connections partially disposed under the shelf between opposing indentations of the set of sides of the cooling structure.
4. The semiconductor laser system of claim 1 wherein each semiconductor laser pump of the array of semiconductor laser pumps comprises an array of semiconductor lasers.
5. The semiconductor laser system of claim 1 further comprising a plurality of lenslet arrays coupled to the array of semiconductor laser pumps.
6. The semiconductor laser system of claim 1 wherein one or more components of the electrical pulse generator are mounted to the second side of the mounting fixture.
7. The semiconductor laser system of claim 6 wherein the one or more components comprise a FET in die form and a sense resistor.
8. A semiconductor laser pump unit comprising:
a diode laser tile comprising:
a mounting structure having a first side and an opposing second side spatially separated from the first side by a plurality of third sides;
a semiconductor laser source attached to the first side of the mounting structure;
a heat sink thermally coupled to the diode laser tile, wherein the heat sink includes a base and a set of sides extending from the base to form an opening, each of the set of sides having opposing indentations, wherein the plurality of third sides of the mounting structure are positioned in the opening between the set of sides, each of the plurality of third sides being in contact with one of the set of sides and fit within the opposing indentations in one of the set of sides; and
a pulse generator attached to the second side of the mounting structure below the semiconductor laser source and attached to the base of the heat sink between the set of sides, wherein the pulse generator comprises:
a sense resistor connected to a power supply; and
a field effect transistor connected to ground.
9. The semiconductor laser pump unit of claim 8 wherein the semiconductor laser source comprises an array of semiconductor laser bars.
10. The semiconductor laser pump unit of claim 8 wherein the heat sink is in thermal communication with a cooling fluid.
11. The semiconductor laser pump unit of claim 9 wherein the array of semiconductor laser bars comprise an array of semiconductor lasers.
12. The semiconductor laser pump unit of claim 8 wherein a first end of the sense resistor is connected to a first terminal of a current sense amplifier.
13. The semiconductor laser pump unit of claim 12 wherein a second end of the sense resistor is connected to a second terminal of the current sense amplifier.
14. The semiconductor laser pump unit of claim 8 wherein the field effect transistor is mounted in die form.
15. The semiconductor laser pump unit of claim 8 wherein the power supply comprises a DC power supply.
16. The semiconductor laser pump unit of claim 15 further comprising a capacitor coupled to the DC power supply.