System and method of multiplexing laser triggers and optically selecting multiplexed laser pulses for laser assisted device alteration testing of semiconductor device
First Claim
1. A pulse laser test system, comprising:
- a conditioning pulse circuit having an output that provides a plurality of asynchronous conditioning trigger pulses at a selected rate;
a probe pulse circuit having an output that provides a synchronized probe trigger pulse;
a pulse laser having a pulse trigger input and a laser output providing a laser pulse for each trigger pulse provided to said pulse trigger input;
a trigger mode controller that provides selected trigger pulses to said pulse trigger input of said pulse laser, wherein said trigger mode controller selects said output of said probe pulse circuit while said synchronized probe trigger pulse is provided causing said pulse laser to provide a synchronized probe laser pulse, and wherein said trigger mode controller otherwise selects said output of said conditioning pulse circuit causing said pulse laser to provide a plurality of asynchronous conditioning laser pulses; and
a laser pulse modulator having an optical input coupled to said laser output of said pulse laser, having a gating input receiving a gate signal from said trigger mode controller, and having an optical output that provides laser pulses passed from said pulse laser while said gate signal is asserted.
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Abstract
A pulse laser test system including a conditioning pulse circuit, a probe pulse circuit, a pulse laser, a trigger mode controller, and a laser pulse modulator. The conditioning pulse circuit provides asynchronous conditioning trigger pulses at a selected rate. The probe pulse circuit provides a synchronized probe trigger pulse. The trigger mode controller selects the probe pulse circuit while the synchronized probe trigger pulse is provided causing the pulse laser to provide a synchronized probe laser pulse, and otherwise selects the output of the conditioning pulse circuit causing the pulse laser to provide asynchronous conditioning laser pulses. The laser pulse modulator has an optical input coupled to the laser output of the pulse laser, has a gating input receiving a gate signal from the trigger mode controller, and has an optical output that provides laser pulses passed from the pulse laser while the gate signal is asserted.
92 Citations
20 Claims
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1. A pulse laser test system, comprising:
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a conditioning pulse circuit having an output that provides a plurality of asynchronous conditioning trigger pulses at a selected rate; a probe pulse circuit having an output that provides a synchronized probe trigger pulse; a pulse laser having a pulse trigger input and a laser output providing a laser pulse for each trigger pulse provided to said pulse trigger input; a trigger mode controller that provides selected trigger pulses to said pulse trigger input of said pulse laser, wherein said trigger mode controller selects said output of said probe pulse circuit while said synchronized probe trigger pulse is provided causing said pulse laser to provide a synchronized probe laser pulse, and wherein said trigger mode controller otherwise selects said output of said conditioning pulse circuit causing said pulse laser to provide a plurality of asynchronous conditioning laser pulses; and a laser pulse modulator having an optical input coupled to said laser output of said pulse laser, having a gating input receiving a gate signal from said trigger mode controller, and having an optical output that provides laser pulses passed from said pulse laser while said gate signal is asserted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of generating laser pulses for laser assisted device alteration testing, comprising:
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providing a plurality of asynchronous conditioning trigger pulses at a selected rate; providing a synchronized probe trigger pulse while the plurality of asynchronous conditioning trigger pulses are provided; selecting the synchronized probe trigger pulse when provided and otherwise selecting the plurality of asynchronous conditioning trigger pulses and providing selected trigger pulses to a pulse trigger input of a pulse laser; generating, by the pulse laser, multiplexed laser pulses in response to the selected trigger pulses including a plurality of asynchronous conditioning laser pulses before and after a synchronized probe laser pulse; and modulating the multiplexed laser pulses to pass at least the synchronized probe laser pulse for laser assisted device alteration testing. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification