10 cm Yb3+ DFB fibre laser with permanent phase shifted grating

Asseh, A.; Storoy, H.; Kringlebotn, J.T.; Margulis, Walter; Sahlgren, Bengt; Sandgren, Simon; Stubbe, R.; Edwall, G.

doi:10.1049/el:19950672

Cited by 87 publications

(25 citation statements)

References 5 publications

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“…The pump threshold is as low as 1.8 W, which is more than 100 times less than the lowest published threshold to date for a Yb-doped laser [3]. The slope efficiency is as high as 18%.…”

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confidence: 69%

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Ultralow-threshold Yb^3+:SiO_2 glass laser fabricated by the solgel process

2007

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A Yb-doped silica microcavity laser on a silicon chip is fabricated from a solgel thin film. The high-Q microtoroid cavity, which has a finesse of 10,000, is evanescently coupled to an optical fiber taper. We report a threshold of 1.8 W absorbed power that is, to the best of our knowledge, the lowest published threshold to date for any Yb-doped laser. . In addition, the rare-earth aggregate emission spectrum spans many key wavelengths from 0.3 to 3 m that are important for imaging, sensing, medical treatment, and communications. While rareearth lasers have been built in large form factors for high-power laser cutting and defense applications, they can also be designed to be small, low power, and ultrasensitive to the environment. The laser resonator finesse, defined as the free spectral range (FSR) divided by the resonance linewidth, quantifies the loss and hence energy storage efficiency of a resonator. For a given cavity, higher finesse results in lower threshold for lasing. Lacovara et al. measured a 71 mW threshold for a Yb 3+

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“…The pump threshold is as low as 1.8 W, which is more than 100 times less than the lowest published threshold to date for a Yb-doped laser [3]. The slope efficiency is as high as 18%.…”

mentioning

confidence: 69%

“…For a given cavity, higher finesse results in lower threshold for lasing. Lacovara [3]. Recently, the ultrahigh-Q ͑Ͼ10 8 ͒ toroid whispering-gallery resonator was invented [4].…”

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confidence: 99%

Ultralow-threshold Yb^3+:SiO_2 glass laser fabricated by the solgel process

2007

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“…Functional block diagram of the MOR the NIF laser system. The oscillator design is a distributed feedback (DFB) laser made by imprinting linear Bragg gratings in a 2.8-micron core rare earth Ytterbium doped Silica fiber 10 . The Bragg gratings form distributed reflectors that define the laser cavity and allow only a single cavity mode to lase.…”

Section: Fib Er Ampmentioning

confidence: 99%

The injection laser system on the National Ignition Facility

et al. 2007

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The National Ignition Facility (NIF) is currently the largest and most energetic laser system in the world. The main amplifiers are driven by the Injection Laser System comprised of the master oscillators, optical preamplifiers, temporal pulse shaping and spatial beam formatting elements and injection diagnostics. Starting with two fiber oscillators separated by up to a few angstroms, the pulse is phase modulated to suppress SBS and enhance spatial smoothing, amplified, split into 48 individual fibers, and then temporally shaped by an arbitrary waveform generator. Residual amplitude modulation induced in the preamplifiers from the phase modulation is also precompensated in the fiber portion of the system before it is injected into the 48 pre-amplifier modules (PAMs). Each of the PAMs amplifies the light from the 1 nJ fiber injection up to the multi-joule level in two stages. Between the two stages the pre-pulse is suppressed by 60 dB and the beam is spatially formatted to a square aperture with precompensation for the nonuniform gain profile of the main laser. The input sensor package is used to align the output of each PAM to the main laser and acquire energy, power, and spatial profiles for all shots. The beam transport sections split the beam from each PAM into four main laser beams (with optical isolation) forming the 192 beams of the NIF. Optical, electrical, and mechanical design considerations for long term reliability and availability will be discussed. Work performed under the auspices of the U. S. Department of Energy under contract W-7405-Eng-48.

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“…Although there were unpublished demonstrations of these lasers as well as reported structures that were unlikely to be DFB action, the first reported DFB fiber laser that was unambiguously a distributed-feedback structure, which also employed UV-postprocessing, was by Asseh et al 6 Since this development, the field of research in DFB fiber lasers has been extensive. [7][8][9] The phase-shifted DFB structure is usually an UVwritten Bragg grating with an induced phase shift at or near the center.…”

Section: Introductionmentioning

confidence: 99%

A dual wavelength distributed-feedback fiber laser

Groothoff¹,

Martelli²,

Canning³

2008

Journal of Applied Physics

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An approach to accessing air holes in a structured optical fiber with a distributed-feedback ͑DFB͒ laser based on higher order mode lasing is proposed and demonstrated. A narrow linewidth DFB fiber laser is fabricated in rare-earth-doped structured optical fiber. A higher order mode is shown to lase. Dual laser operation in both fundamental and higher order modes is also achieved. Numerical simulation of the mode profiles within the fiber using the adjustable boundary conditions-Fourier decomposition method supports the experimental results. Laser performance for each mode is characterized including imaging the emission of pump and lasing mode intensity profiles.

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10 cm Yb3+ DFB fibre laser with permanent phase shifted grating

Cited by 87 publications

References 5 publications

Ultralow-threshold Yb^3+:SiO_2 glass laser fabricated by the solgel process

Ultralow-threshold Yb^3+:SiO_2 glass laser fabricated by the solgel process

The injection laser system on the National Ignition Facility

A dual wavelength distributed-feedback fiber laser

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