Mode-locked fiber laser with improved life-time of saturable absorber
First Claim
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1. A mode locked fiber laser system arranged to have an output having a lasing bandwidth and having a linear cavity, said cavity comprising:
- a fiber gain medium,a saturable absorber having a saturation fluence, anda substantially uniform Bragg grating filter having a spectral response and a bandwidth of less than 3 nm, andwherein said mode locked fiber laser system is arranged so that substantial CW mode locked operation is obtainable when less than 3 times the saturation fluence is impinging on the saturable absorber, andthe spectral response of the filter is arranged to dampen a spectral broadening relative to the lasing bandwidth;
said system further comprises an output coupler arranged between said substantially uniform Bragg grating filter and said saturable absorber.
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Abstract
A mode locked fiber laser system is arranged to have a lasing bandwidth and having a linear cavity, the cavity including a gain medium, a saturable absorber having a saturation power, and a filter having a spectral response, wherein the mode locked fiber laser system is arranged so that substantial CW mode locked operation is obtainable with less than 3 times the saturation fluence impinging on the saturable absorber.
8 Citations
32 Claims
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1. A mode locked fiber laser system arranged to have an output having a lasing bandwidth and having a linear cavity, said cavity comprising:
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a fiber gain medium, a saturable absorber having a saturation fluence, and a substantially uniform Bragg grating filter having a spectral response and a bandwidth of less than 3 nm, and wherein said mode locked fiber laser system is arranged so that substantial CW mode locked operation is obtainable when less than 3 times the saturation fluence is impinging on the saturable absorber, and the spectral response of the filter is arranged to dampen a spectral broadening relative to the lasing bandwidth; said system further comprises an output coupler arranged between said substantially uniform Bragg grating filter and said saturable absorber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A mode locked fiber laser system arranged to have an output having a lasing bandwidth and a pulse peak power, said system having a linear cavity with a non-linear property, said cavity comprising:
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a fiber gain medium, a saturable absorber, and a substantially uniform Bragg grating filter having a spectral response and a bandwidth of less than 3 nm, wherein the spectral response of said filter is arranged to reduce spectral components outside said lasing bandwidth arising from self-phase modulation caused by said non-linear property and an increase in pulse peak power; said system further comprises an output coupler arranged between said substantially uniform Bragg grating filter and said saturable absorber.
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18. A mode locked fiber laser system arranged to have an output having a lasing bandwidth and a pulse power in CW mode-locked operation, said laser having a linear cavity, said cavity comprising:
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a fiber gain medium, a saturable absorber having a saturation fluence, and a substantially uniform Bragg filter having a spectral response and a bandwidth, wherein said filter is arranged to exhibit an increased loss outside the lasing bandwidth of less than 3 nm so that a spectral broadening relative to said lasing bandwidth due to an increase in optical pulse power is sufficiently penalized to stabilize the laser in CW mode-locking operation; said system further comprises an output coupler arranged between said substantially uniform Bragg grating filter and said saturable absorber. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification