Spectrally stabilized high-power high-brightness DBR-tapered lasers in the VIS and NIR range

Sumpf, B.; Paschke, K.

doi:10.1117/12.2288425

Cited by 9 publications

(11 citation statements)

References 19 publications

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“…The CBC architecture demonstrated here relies only on off-the-shelf optical elements combined with state of art TPAs. As tapered amplifiers are now available at a wide range of wavelengths, from to the red to the NIR [7], our setup can easily be adapted for other applications. Besides its use for nonlinear frequency conversion towards the visible, our approach would also be effective to develop powerful pump sources for high-brightness pumping of fibre or bulk-crystal amplifiers.…”

Section: Discussionmentioning

confidence: 99%

“…TPL and TPA devices consist of a single mode ridge waveguide (RW) followed by flared gain-guided amplifier section. Spectrally stabilized TPL are available in the visible (VIS) and near-infrared (NIR) spectral range and reach output powers up to 15 W per device [7] and can be converted to multiple watts of VIS light [8] by making use of a cascade of two SHG crystals [9,10]. Further power scaling can be achieved using an increased NIR pump laser power enabled by research on highly efficient high power diode lasers [11].…”

Section: Introductionmentioning

confidence: 99%

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Coherent combining of high brightness tapered amplifiers for efficient non-linear conversion

Albrodt¹,

Jamal²,

Hansen³

et al. 2019

Opt. Express

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We report on a coherent beam combination of three high-brightness tapered amplifiers, which are seeded by a single-frequency laser at λ = 976 nm in a simple architecture with efficiently cooled emitters. The maximal combined power of 12.9 W is achieved at a combining efficiency of > 65%, which is limited by the amplifiers' intrinsic beam quality. The coherent combination cleans up the spatial profile, as the central lobe's power content increases by up to 86%. This high-brightness infrared beam is converted into the visible by second harmonic generation. This results in a high non-linear conversion efficiency of 4.5%/W and a maximum power over 2 W at 488 nm, which is limited by thermal effects in the periodically poled lithium niobate (PPLN).

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coherent combining of high brightness tapered amplifiers for efficient non-linear conversion

Albrodt¹,

Jamal²,

Hansen³

et al. 2019

Opt. Express

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“…4. We fitted the pump depletion approximation (1) where η is the nonlinear conversion efficiency, to the experimental values for pump powers < 6 W. The nonlinear conversion efficiencies in case A2 and A1+2+3 obtained by numerical fitting are 2.6 %/W and 4.5 %/W, respectively. This corresponds to an increase of up to 73 % enhanced by the beam clean-up and the scaled brightness.…”

Section: Single Pass Second Harmonic Generationmentioning

confidence: 99%

“…High brightness tapered lasers (TPL) and tapered amplifiers (TPA) combine an excellent beam quality with high powers 1 and are a promising building block for brightness scaling in beam combining architectures 2 for example by coherent beam combining (CBC). CBC is the superposition of multiple laser beams by constructive interference.…”

Section: Introductionmentioning

confidence: 99%

Recent progress in brightness scaling by coherent beam combining of tapered amplifiers for efficient high power frequency doubling

Albrodt

Jamal²,

Hansen³

et al. 2019

High-Power Diode Laser Technology XVII

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High brightness diode laser beam combining techniques are in demand for efficient high power nonlinear conversion. Coherent beam combining (CBC) is the only method that has the potential for brightness scaling by maintaining one single narrow spectral linewidth. CBC in a master oscillator power amplifier (MOPA) configuration using a small number of efficiently cooled tapered amplifiers is a promising approach for efficient brightness scaling in a simple architecture. We present the application of such a source based on CBC of three tapered amplifiers seeded by a DFB laser at λ = 976 nm for second harmonic generation (SHG). A maximum power of 2.1 W at 488 nm was generated by SHG in a MgO:PPLN bulk crystal limited by thermal effects. A clear benefit of the beam clean-up resulting from the CBC setup was documented leading to an improved nonlinear efficiency. As part of our ongoing studies into further brightness scaling in CBC architectures, we present an experimental analysis of the phase dynamics of tapered amplifiers in quasi continuous operation (QCW) at high currents. Furthermore, we are investigating different amplifier designs for improved beam quality at high powers and therefore improved combining efficiency.

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“…Diffraction-limited high-power diode lasers have been available from the red to the near infrared spectral range since the introduction of tapered diode laser technique, where a narrow-stripe ridge-waveguide (RW) section ensures a diffraction-limited emission, and a tapered amplifier (TA) section allows high output power [1][2][3]. The techniques to achieve narrow-linewidth emission by etching a grating in the semiconductor material, such as the distributed feedback (DFB) or distributed Bragg reflector (DBR) feedback techniques, are well developed for tapered diode lasers in the near infrared from 900 to 1200 nm [3][4][5]. These techniques are not mature around 808 nm, and no DBR or DFB tapered diode lasers around 808 nm are commercially available, to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Micro-integrated high-power narrow-linewidth external-cavity tapered diode laser at 808 nm

et al. 2020

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Spectrally stabilized high-power high-brightness DBR-tapered lasers in the VIS and NIR range

Cited by 9 publications

References 19 publications

Coherent combining of high brightness tapered amplifiers for efficient non-linear conversion

Coherent combining of high brightness tapered amplifiers for efficient non-linear conversion

Recent progress in brightness scaling by coherent beam combining of tapered amplifiers for efficient high power frequency doubling

Micro-integrated high-power narrow-linewidth external-cavity tapered diode laser at 808 nm

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