APPARATUS AND METHODS FOR UNIFORM SAMPLE CLOCKING
First Claim
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1. A clocking method for optical coherence tomography, comprising the steps of coupling a swept source laser to a uniform frequency sample clock pathway and generating a clocking signal corresponding to the swept source laser.
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Abstract
A method and a system for Uniform Frequency Sample Clocking to directly sample the OCT signal with a temporally-non-linear sampling clock derived from a k-space wavemeter on the external sample clock input port of a digitizer.
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20 Claims
- 1. A clocking method for optical coherence tomography, comprising the steps of coupling a swept source laser to a uniform frequency sample clock pathway and generating a clocking signal corresponding to the swept source laser.
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17. A system for uniform frequency sample clocking comprising:
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a. a sampling circuit deriving an external sample clock signal from an auxiliary wavemeter during the limited duty cycle of a tunable laser source and a pre-locked voltage controlled oscillator during the non-sweeping segment of each duty cycle; b. a phase locked loop to sync the voltage controlled oscillator output with the auxiliary wavemeter output, at which time the external sample clock is switched from the optical wavemeter output to the output of the voltage controlled oscillator, wherein c. the lock is regained when the laser begins to sweep and the output is switched to the k-space auxiliary wavemeter output.
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18. An optical coherence tomographic system comprising:
a. a swept light source including a plurality of fiber optic couplers to subdivide the swept light source into a primary optical coherence tomographic interferometer, and a uniform frequency sample clock pathway to generate a clock signal allowing an acquisition of the optical coherence tomographic signal data directly in the wavenumber (k) space. - View Dependent Claims (19, 20)
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