CARRIER-ENVELOPE-PHASE STABILIZATION OF A MASTER OSCILLATOR OPTICAL AMPLIFIER SYSTEM
First Claim
Patent Images
1. A laser system comprising:
- a laser generating modelocked pulses;
a stretcher for stretching the modelocked pulses;
an optical amplifier for amplifying the modelocked pulses;
a pulse compressor for compressing the amplified pulses;
a detector for measuring the carrier envelope phase of the compressed pulses and generating an output signal corresponding thereto;
a first controller generating a first feedback signal in response to changes in the output signal, said first feedback signal for controlling the modelocked laser, said first feedback signal having a first frequency range; and
a second controller for generating a second feedback signal in response to changes in the output signal, said second feedback signal having a second frequency range lower than the first frequency range, said second feedback signal for controlling one of the pulse stretcher or pulse compressor.
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Abstract
A laser and amplifier combination delivers a sequence of optical pulses at a predetermined pulse-repetition frequency PRF. An interferometer generates a signal representative of the carrier-envelope phase (CEP) of the pulses at intervals corresponding to the PRF. The signal includes frequency components from DC to the PRF. The signal is divided into high and low frequency ranges. The high and low frequency ranges are sent to independent high frequency and low frequency control electronics, which drive respectively a high-frequency CEP controller and a low frequency controller for stabilizing the CEP of pulses in the sequence.
13 Citations
22 Claims
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1. A laser system comprising:
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a laser generating modelocked pulses; a stretcher for stretching the modelocked pulses; an optical amplifier for amplifying the modelocked pulses; a pulse compressor for compressing the amplified pulses; a detector for measuring the carrier envelope phase of the compressed pulses and generating an output signal corresponding thereto; a first controller generating a first feedback signal in response to changes in the output signal, said first feedback signal for controlling the modelocked laser, said first feedback signal having a first frequency range; and a second controller for generating a second feedback signal in response to changes in the output signal, said second feedback signal having a second frequency range lower than the first frequency range, said second feedback signal for controlling one of the pulse stretcher or pulse compressor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15, 22)
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9. A laser system comprising:
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a laser generating modelocked pulses; a stretcher for stretching the modelocked pulses; an optical amplifier for amplifying the modelocked pulses; a pulse compressor for compressing the amplified pulses; a detector for measuring the carrier envelope phase (CEP) of the compressed pulses and generating an output signal corresponding thereto; a first controller generating a first feedback signal in response to changes in the output signal, said first feedback signal for controlling the CEP of the pulses delivered from the modelocked laser to the optical amplifier, the first feedback signal having a first frequency range; and a second controller for generating a second feedback signal in response to changes in the output signal, said second feedback signal for controlling one of the pulse stretcher or pulse compressor, said second feedback signal having a second frequency range lower than the first frequency range, said second feedback signal controlling the CEP of the compressed pulses. - View Dependent Claims (10, 11, 12, 13, 14)
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16. A method of operating a laser system including a modelocked laser generating laser pulses that are is supplied to a stretcher, followed by an amplifier and followed by a compressor, said method comprising:
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monitoring the carrier envelope phase (CEP) of the pulses exiting the compressor and generating an output signal corresponding thereto; creating separate first and second feedback signals based on the monitored CEP, said first and second feedback signals having respectively first and second frequency ranges with the first frequency range being higher in frequency than the second frequency range; adjusting the CEP of the modelocked laser based on the first feedback signal; and supplying the second feedback signal to one of the stretcher or compressor to adjust the CEP of the compressed pulses. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification