2.7 W diffraction-limited yellow lasers by efficient frequency doubling of high-brightness tapered diode lasers

Vilera, M.; Christensen, Mathias; Hansen, Anders Kragh; Arulthasan, Paranitharan; Noordegraaf, Danny; Buss, Thomas; Jensen, Ole Bjarlin; Andersen, Peter E.; Skovgaard, Peter M. W.

doi:10.1016/j.optcom.2018.11.052

Cited by 13 publications

(3 citation statements)

References 27 publications

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“…Operation in QCW mode allows to overcome the thermal limitations in the amplifiers and to test the potential of the devices at higher powers as shown earlier in Figure 7. Additionally, CBC of tapered amplifiers operated in QCW mode can be useful for the development of modulated high power visible laser sources to address medical applications requiring millisecond and microsecond pulses 18,19 . The challenge of CBC in QCW is to control the turn-on dynamics in the amplifiers especially regarding the alignment and phase matching between the different beams in the CBC-interferometer.…”

Section: Cbc In Quasi Continous Wave Operationmentioning

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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Section: Cbc In Quasi Continous Wave Operationmentioning

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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“…Nowadays, yellow light lasers operating at 565-590 nm have attracted extensive attention in various fields, for example, in the biomedical area, where yellow light lasers can be used for the treatment of vascular diseases due to hemoglobin's high absorption of yellow light at wavelengths [1][2][3]. However, the output of a yellow laser is relatively difficult, since it is mainly based on high maintenance dye lasers or complex nonlinear frequency transformations such as a sum frequency generation [4], frequency doubling [5], four-wave mixing [6] and Raman conversion [7]. By contrast, direct access of a yellow laser by using a laser diode (LD) to pump rare-earth (RE)-ion doped fibers can leave out the complicated nonlinear optical processes for higher integration and has a high heat dissipation performance.…”

Section: Introductionmentioning

confidence: 99%

Efficient and Broadband Emission in Dy3+-Doped Glass-Ceramic Fibers for Tunable Yellow Fiber Laser

Chen

Xiong

et al. 2023

Nanomaterials

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Yellow lasers are of great interest in biology, medicine and display technology. However, nonlinear emission of near-infrared lasers at yellow still presents particularly complex optical alignment to date. Here, to the best of our knowledge, we demonstrate the fabrication of a NaLa(WO4)2: Dy3+ glass-ceramic fiber (GCF) for the first time. More importantly, the emission band of the GCF, which is around 575 nm, has a wide full-width half maximum (FWHM) of 18~22 nm, which is remarkably larger than that of the Dy3+-doped YAG crystal (<7 nm). The precursor fiber (PF) was drawn using the molten core drawing (MCD) method. In particular, benefiting from the in situ nanocrystals fabricated in the amorphous fiber core after thermal treatment, the resultant glass-ceramic fiber exhibits a five-times enhancement of luminescence intensity around 575 nm, compared with the precursor fiber, while retaining its broadband emission. Overall, this work is anticipated to offer a high potential GCF with prominent bandwidth for the direct access of a tunable yellow laser.

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“…However, for the smaller mode spacing of the relatively long wavelength stabilized high-power lasers, e.g., tapered laser diodes, small frequency perturbations from feedback can lead to mode hopping. This mode hopping can be detrimental, e.g., SHG, where a wavelength shift of tens of picometers can significantly change the conversion efficiency [10]. Some work has also concerned a more general description of the different effects seen at low feedback power ratios, both experimentally [11] and numerically [12,13].…”

Section: Introductionmentioning

confidence: 99%

Measuring the sensitivity to optical feedback of single-frequency high-power laser diodes

et al. 2021

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Laser diodes, in general, are sensitive to optical feedback, especially with regards to maintaining single-frequency operation. Until now, however, the feedback sensitivity of high-power devices such as single-frequency DBR tapered laser diodes has not been investigated in quantitative detail. In this paper, we analyze the impact of very weak optical feedback between −105 dB and −40 dB on a high-power DBR tapered laser diode. The measurement set-up is validated using a typical DFB laser diode. The results are in good agreement with theory at low feedback levels.

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2.7 W diffraction-limited yellow lasers by efficient frequency doubling of high-brightness tapered diode lasers

Cited by 13 publications

References 27 publications

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

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

Efficient and Broadband Emission in Dy3+-Doped Glass-Ceramic Fibers for Tunable Yellow Fiber Laser

Measuring the sensitivity to optical feedback of single-frequency high-power laser diodes

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