In this paper, we present a complete overview of the optical and noise performances of a high power single-frequency
and single-mode fiber laser system operating at 780 nm. It provides up to 1.8W of linearly polarized output power at 780
nm, with 150 kHz linewidth and a perfect diffraction limited Gaussian beam. This newly developed fiber laser source is
dedicated to trapping and cooling of Rb atoms for Bose-Einstein condensation or gravimetric applications. A great
attention was paid to the laser intensity and frequency noises, linewidth and beam characterization of this all-fiber
system.
We report our developments of a 3-visible-wavelengths (Green, Yellow, Red) CW fiber laser system providing more
than 3W of output power per colour on a single output path, in a simple and robust design. The system is based on three
infrared narrow linewidth linearly polarized all-fiber lasers, combined into the same output PM fiber by a fused-fiber PM
multiplexer. This component has been specially developed for the wavelengths of interest and to sustain high powers in
CW operation. The common polarized infrared output is sent into a non linear optical stage to generate visible
wavelengths, using periodically-poled non linear crystals and single-pass frequency doubling configuration. The system
provides either 4W at 532 nm, 3W at 577 nm or 3.5W at 633 nm with a perfect beam quality and a free-space output.
We present in this paper second-harmonic generation (SHG) results of narrow-linewidth continuous-wave 1064 nm fiber
lasers in periodically-poled crystals. We particularly compare SHG efficiencies that can be obtained in PPLN with
single-frequency linearly-polarized fiber lasers and with narrow linewidth longitudinally multimode linearly-polarized
fiber lasers. Both infrared lasers can provide around 4.5W at 1064nm. Due to the high number of modes, sum-frequencies
between modes enhance the efficiency of multimode SHG by a factor of roughly 2 compared to single-frequency,
but green generated radiation suffers from important intensity noise. Conversely, single-frequency SHG is
less efficient, but intensity noise is greatly improved.
We present in this paper multi-watts CW operation of an Ytterbium-doped fiber laser directly emitting at wavelengths
above 1150 nm for frequency-doubling in the yellow spectral range. A maximum output power of more than 15W has
been obtained at 1154 nm in CW linearly polarized operation with a linewidth of less than 0.20 nm (FWHM) in an all-fiber
configuration. Multi-watts second-harmonic generation (SHG) in the yellow spectral range with periodically-poled
non linear crystals is presented.
This work reports single-frequency laser oscillation at λ = 1003.4 nm of an optically pumped external cavity semiconductor laser. By using a gain structure bonded onto a high conductivity substrate, we demonstrate both theoretically and experimentally the strong reduction of the thermal resistance of the active semiconductor medium, resulting in a high power laser emission. The spectro-temporal dynamics of the laser is also explained. Furthermore, an intracavity frequency-doubling crystal was used to obtain a stable single-mode generation of blue (λ = 501.5 nm) with an output power around 60 mW.
Single-frequency IR and visible lasers are of a great interest in many research and application fields. We present in this paper, what we believe to be, to the best of our knowledge, the first diode-pumped Ytterbium-doped solid-state laser emitting at 1003.4 nm in single-frequency operation and first results obtained in the blue-green region by second harmonic generation (SHG).
The laser is based on an diode-pumped Yb:YSO (Yb:Y2SiO5) crystal. The choice of an Yb-doped crystal, pumped at 978 nm, involves two main constraints. First, the small difference, between pump and laser wavelengths, prevents the use of suitable standard dichroic mirrors. Secondly, due to the quasi-three level transition, reabsorption is significant around 1 μm and pump-absorption has to be highly saturated all along the crystal length.
The pump source is a single-emitter laser diode providing a maximum power of 4 W at 978 nm. The resonator is a six-mirror ring-cavity containing a Faraday rotator to obtain unidirectional operation. A thin Fabry-Perot etalon at Brewster angle is used to maintain linear polarization as well as finely tune the laser wavelength.
More than 300 mW of single-frequency radiation at 1003.4 nm has been obtained for 3.2 W of incident pump power. First intracavity SHG results are also presented using a KNbO3 nonlinear crystal at 76.5 °C to operate in non-critical phase-matching. In this configuration, 300 mW of IR radiation and 14 mW of aquamarine wavelength (501.7 nm) have simultaneously been obtained at room temperature in single-frequency operation.
We present here the first CW high power laser operation obtained under diode-pumping with an Yb3+:CaF2 crystal. This crystal exhibits good thermo-optical properties and can easily be grown in bulk crystals or in thin films. A maximum power of 5.8 W in a diffraction limited beam has been obtained with a 5% ytterbium-doped crystal of 4 mm-long. Moreover, the laser wavelength has been tuned over 54 nm, between 1018 and 1072 nm, and the double-pass small-signal gain has been measured to be more than 1.8, showing the great potential of Yb3+:CaF2 as a gain media for ultra-short pulses operation or as amplifier.
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