Broadband continuous-wave laser

Kowalski, Frank V.; Hale, Paul D.; Shattil, S.

doi:10.1364/ol.13.000622

“…This was demonstrated first in a passive cavity [8] and later with an active cavity [9,10]. The group at Golden [11,12] was also the first to start characterizing the optical output spectrum of a FSF laser.…”

Section: The Fsf Laser Conceptmentioning

confidence: 99%

Ranging with frequency-shifted feedback lasers: from $$\upmu$$ μ m-range accuracy to MHz-range measurement rate

Kim¹,

Ogurtsov²,

Bonnet³

et al. 2016

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We report results on ranging based on frequency shifted feedback (FSF) lasers with two different implementations: (1) An Ytterbium-fiber system for measurements in an industrial environment with accuracy of the order of 1 µm, achievable over a distance of the order of meters with potential to reach an accuracy of better than 100 nm; (2) A semiconductor laser system for a high rate of measurements with an accuracy of 2 mm @ 1 MHz or 75 µm @ 1 kHz and a limit of the accuracy of ≥ 10 µm. In both implementations, the distances information is derived from a frequency measurement.The method is therefore insensitive to detrimental influence of ambient light. For the Ytterbium-fiber system a key feature is the injection of a single frequency laser, phase modulated at variable frequency Ω, into the FSFlaser cavity. The frequency Ω max at which the detector signal is maximal yields the distance. The semiconductor FSF laser system operates without external injection seeding. In this case the key feature is frequency counting that allows convenient choice of either accuracy or speed of measurements simply by changing the duration of the interval during which the frequency is measured by counting.

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“…The interferometer output intensity filtered near one of the frequencies given by Eq. (11) or Eq. (12) is the quasi-monochromatic signal…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Ranging with Frequency-Shifted Feedback Lasers: From μm-Range Accuracy to MHz-Range Measurement Rate

Kim¹,

Ogurtsov²,

Bonnet³

et al. 2018

Exploring the World With the Laser

0

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We report results on ranging based on frequency shifted feedback (FSF) lasers with two different implementations: (1) An Ytterbium-fiber system for measurements in an industrial environment with accuracy of the order of 1 µm, achievable over a distance of the order of meters with potential to reach an accuracy of better than 100 nm; (2) A semiconductor laser system for a high rate of measurements with an accuracy of 2 mm @ 1 MHz or 75 µm @ 1 kHz and a limit of the accuracy of ≥ 10 µm. In both implementations, the distances information is derived from a frequency measurement.The method is therefore insensitive to detrimental influence of ambient light. For the Ytterbium-fiber system a key feature is the injection of a single frequency laser, phase modulated at variable frequency Ω, into the FSFlaser cavity. The frequency Ω max at which the detector signal is maximal yields the distance. The semiconductor FSF laser system operates without external injection seeding. In this case the key feature is frequency counting that allows convenient choice of either accuracy or speed of measurements simply by changing the duration of the interval during which the frequency is measured by counting. 2 J. I. Kim et al.

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“…The lasing mechanism of a frequency-shifted feedback (FSF) laser (FSFL) is somewhat different from that of a conventional laser because it is formed by successive frequency shifts of the spectral components of the cavity modes [1]. This means that in terms of the spectral cavity mode, it cannot have a steady-state condition.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, one can obtain a variety of unique and distinctive lasing properties from these types of lasers. Therefore, FSFLs have been investigated as coherent light sources for various applications, such as broadband continuous-wave (CW) lasers [1,2], multiwavelength lasers [3][4][5], and pulsed lasers [6][7][8][9][10][11][12]. In general, the FSF mechanism is obtained by an acousto-optic modulator (AOM), either an upshifting or downshifting type, inserted in the laser cavity.…”

Section: Introductionmentioning

confidence: 99%

Power-Scalable, Sub-Nanosecond Mode-Locked Erbium-Doped Fiber Laser Based on a Frequency-Shifted-Feedback Ring Cavity Incorporating a Narrow Bandpass Filter

Vazquez-Zuniga

¹

,

Jeong

²

2013

Journal of the Optical Society of Korea

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We present an all-fiberized power-scalable, sub-nanosecond mode-locked laser based on a frequencyshifted-feedback ring cavity comprised of an erbium-doped fiber, a downshifting acousto-optic modulator (AOM), and a bandpass filter (BPF). With the aid of the frequency-shifted feedback mechanism provided by the AOM and the narrow filter bandwidth of 0.45 nm, we generate self-starting, mode-locked optical pulses with a spectral bandwidth of ~0.098 nm and a pulsewidth of 432 to 536 ps. In particular, the output power is readily scalable with pump power while keeping the temporal shape and spectral bandwidth. This is obtained via the consolidation of bound pulse modes circulating at the fundamental repetition rate of the cavity. In fact, the consolidated pulses form a single-entity envelope of asymmetric Gaussian shape where no discrete internal pulses are perceived. This result highlights that the inclusion of the narrow BPF into the cavity is crucial to achieving the consolidated pulses.

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Broadband continuous-wave laser

Cited by 100 publications

References 3 publications

Ranging with frequency-shifted feedback lasers: from $$\upmu$$ μ m-range accuracy to MHz-range measurement rate

Ranging with frequency-shifted feedback lasers: from $$\upmu$$ μ m-range accuracy to MHz-range measurement rate

Ranging with Frequency-Shifted Feedback Lasers: From μm-Range Accuracy to MHz-Range Measurement Rate

Power-Scalable, Sub-Nanosecond Mode-Locked Erbium-Doped Fiber Laser Based on a Frequency-Shifted-Feedback Ring Cavity Incorporating a Narrow Bandpass Filter

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