Integrated optical systems for generating an array of beam outputs
An optical system for producing an array of single transverse mode laser beam output includes a monolithic laser array ( 23 ) having a plurality of outputs ( 5 ) in which each laser ( 4 ) is adapted for operation so as to produce a single transverse mode output; and an array of waveguides ( 10 ), the waveguide array being positioned in relation to the laser array such that each laser output from the laser array couples into an input of a respective waveguide ( 11 ) in the waveguide array, the waveguide array maintaining the single transverse mode of each laser output at a respective waveguide output to provide a single transverse mode beam output. Multiple laser arrays ( 23 ) be coupled to a single waveguide array ( 10 ) enabling the formation of very large arrays and arrays with beam pitch smaller than otherwise possible.
1 . An optical system comprising:
a monolithic laser array having a plurality of outputs in which each laser is adapted for operation so as to produce a single transverse mode output;
an array of waveguides, the waveguide array being positioned in relation to the laser array such that each laser output from the laser array couples into an input of a respective waveguide in the waveguide array, the waveguide array maintaining the single transverse mode of each laser output at a respective waveguide output to provide a single transverse mode beam output.
2 . The optical system of claim 1 further including a plurality of monolithic laser arrays each having a plurality of outputs in which each laser is adapted for operation so as to produce a single mode output, and each laser output of the plural monolithic arrays couples into an input of a respective waveguide in the waveguide array.
3 . The optical system of claim 1 in which the or each monolithic laser array and the waveguide array are mounted on a common package substrate.
4 . The optical system of claim 1 further including means, in the waveguide array for independently controlling the power output of at least some of the waveguides.
5 . The optical system of claim 1 in which the waveguide inputs of the waveguide array have a first pitch and the waveguide outputs of the waveguide array have a second pitch.
6 . The optical system of claim 5 in which the first pitch is greater than the second pitch.
7 . The optical system of claim 1 in which the number of laser outputs optically coupled to a single waveguide output is greater than one.
8 . The optical system of claim 7 in which at least some of the laser outputs are separately switchable.
9 . The optical system of claim 1 further including a lens element optically coupled to each waveguide output.
10 . The optical system of claim 1 in which each waveguide in the waveguide array splits such that each waveguide input corresponds to plural waveguide outputs while capable of maintaining a single mode output at each waveguide output.
11 . The optical system of claim 1 in which each waveguide in the waveguide array splits such that plural waveguide inputs correspond to a single waveguide output while capable of maintaining a single mode output at each waveguide output.
12 . The optical system of claim 1 in which the waveguide array includes a mode filter in at least some of the waveguides.
13 . The optical system of claim 1 in which the waveguide array includes a beam shaper in at least some of the waveguides.
14 . The optical system of claim 1 in which the waveguide array includes a photodiode associated with at least some of the waveguides adapted to monitor power output from the respective waveguide.
15 . The optical system of claim 1 in which the inputs of the waveguides in said waveguide array include a tapered section such that the or a diameter of the waveguide input is greater than the or a diameter of the output.
16 . The optical system of claim 1 in which each waveguide in the waveguide array has at least a portion thereof having a lateral dimension transverse to the direction of beam propagation which is 1 micron or less.
17 . The optical system of claim 1 in which the waveguide array is formed on a single semiconductor substrate.
18 . The optical system of claim 17 in which each waveguide in the array is formed by locally varying the refractive index in the semiconductor substrate using photolithographic techniques.
19 . The optical system of claim 18 in which each waveguide in the array is formed using quantum well intermixing.
20 . The optical system of claim 1 further including a plurality of waveguide arrays, each waveguide array being positioned in relation to the laser array such that each laser output couples into an input of a respective waveguide in the plurality of waveguide arrays, each waveguide maintaining the single transverse mode of each laser output at a respective waveguide output to provide a single transverse mode output thereat.
21 . The optical system of claim 1 in which the laser array is a laser diode array.
22 . The optical system of claim 14 further including a feedback loop between the or each photodiode and a drive circuit controlling the laser array.
23 . A method for producing an array of laser output beams each having a single transverse mode comprising the steps of:
providing a monolithic laser array having a plurality of outputs in which each laser is adapted for operation so as to produce a single transverse mode output;
positioning an array of waveguides in relation to the laser array such that each laser output from the laser array couples into an input of a respective waveguide in the waveguide array,
the waveguide array maintaining the single transverse mode of each laser output at a respective waveguide output to provide a single transverse mode beam output.
24 .- 25 . (canceled)