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Experimental Investigation of Power-Scaled Dissipative Soliton Generation
摘要： We conduct a power scaling study for the femtosecond dissipative soliton generation with a 10-μm core diameter, ?ber-based, compact-sized, and low-cost all-normal-dispersion laser con?guration. Laser performance, in terms of spectra distribution, temporal characteristic, average power, and stability in 8 h, for different ?ltering bandwidths has been investigated. The obtainable highest output power and shortest pulse duration are 4.5 W and 85 fs, respectively. To our best knowledge, this is the shortest pulse duration among the reported all-?ber pumped Watt-level mode-locked ?ber lasers.
关键词： mode-locking,pulse-shaping,dissipative soliton,laser performance,power-scaling
更新于2025-09-23 15:19:57
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Coherent Beam Combining by Noncollinear Sum-Frequency Generation
摘要： Despite rapid development of fiber laser technologies, highest pulse peak power achievable from fiber lasers eventually approaches limits which are not easy to overcome. Therefore, there is growing interest in methods, which would allow to combine outputs from multiple pulsed fiber lasers into single diffraction-limited beam, and by this enable further scaling. For this reason, numerous coherent and incoherent beam combining methods are being proposed and investigated. Not so well investigated class of beam combining methods is beam combing based on nonlinear interaction. In our earlier work, we have demonstrated beam combining by multiplexing pulses in time, using second-order nonlinear crystal set in noncollinear phase-matching configuration. However, such configuration allows to scale only average power of the beam, leaving pulse energy unchanged (in case of 50 % conversion efficiency). In order to scale pulse energy and peak power, pulses have to be also combined in time, and for this, phase control is needed. Such approach was first proposed by Michailovas et al. and first proof of concept demonstrated by Zhang et al.. However, in previous demonstrations, low-power beams were combined with very low combining efficiency (<0.4 % for 4 beams). Here we apply this method to more realistic scenario and demonstrate combining of pulsed beams from 4 high-power fiber amplifiers with efficiency up to 49 %. Moreover, we demonstrate pulse energy and peak power improvement in the combined beam, exceeding peak-power limitations of single fiber amplifier.
关键词： noncollinear sum-frequency generation,fiber lasers,pulse energy scaling,peak power scaling,coherent beam combining
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Design Strategies for Power Scaling of GaSb-Based Superluminescent Diodes for 2 – 3 μm Wavelength Range
摘要： Mid-infrared semiconductor light sources emitting around 2–3 μm wavelength are instrumental for an increasing number of applications, such as molecular spectroscopy, trace-gas sensing, medical diagnostics and eye-safe LIDAR. For example, the monitoring of greenhouse gases (C2H2, CO2, CO and N2O) can be done with higher sensitivity using their molecular fingerprints in this wavelength range [1]. On the other hand, for a wider penetration to applications other important aspects, such as cost, power efficiency, portability and reproducibility are the key enablers. To this end, mid-IR silicon-photonics technology has emerged as a developed platform, yet so far relaying on the use of extended-cavity tunable laser concepts [2]. Alternatively, we have proposed the use of high power, spectrally broadband ridge waveguide (RWG) GaSb-based superluminescent diodes (SLDs) exhibiting single-transverse mode for efficient coupling to silicon photonics waveguide and enabling the development of spectral-programmable broadband light sources [3]. While 2–3 μm GaSb-based laser diodes have shown a good level of performance, yet the development of SLDs devices has seen little progress, owing to the peculiarity of GaSb material system, which is less spread as optoelectronics platform, and physics consideration, for example linked to increased Auger recombination. Most recent developments in the performance of GaSb gain-chips at room temperature (RT) include the demonstration of output powers of up to 60 mW at 1.9 μm [4], 10 mW at 2.25 μm, and 5 mW at 2.38 μm [5] for continuous-wave (CW) operation, and 3.2 mW average power at 2.55 μm [6] for pulse operation. Here we report a comparative study of using novel single- and double-pass SLED designs employing a cavity suppression (CS) element, shown in Fig.1. The active region consists of compressively strained GaInSb/AlGaAsSb double QWs [4]. We operated the devices under CW at RT. The double-pass approach has produced an output power up to 120 mW, which is 100% more than our previous single-pass demonstration. The high power is achieved due to the double-pass light amplification and better material quality. The cavity suppression element enabled high current injection with a broad spectrum having a spectral full width at half maximum (FWHM) of 70 nm and 40 nm for single- and double-pass SLDs, respectively. In conclusion, we reported the highest power GaSb-based SLD demonstrated so far, reaching a power level as high as 120 mW and a spectral bandwidth of 40 nm in a single-transvers mode-operation.
关键词： cavity suppression,single-transverse mode,mid-infrared,power scaling,GaSb-based superluminescent diodes
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Power-Scaling Nonlinear-Mirror Modelocked Thin-Disk Lasers
摘要： High-power ultrafast laser sources constitute a key technology to a wide variety of scientific and industrial applications that benefit from the combination of high average power and sub-ps pulse duration. While coherently combined amplifier systems now deliver kW-level average powers, ultrafast thin-disk lasers (TDLs) remain of considerable interest as compact, low-noise laser sources delivering multi-hundred-Watts with excellent beam quality. These oscillators are usually modelocked using either of two well-established techniques: SESAM or Kerr-lens modelocking (KLM). Recently, we demonstrated the first TDL modelocked using the frequency-doubling nonlinear mirror (NLM). This technique relies on the combination of an intracavity χ(2) crystal used for second-harmonic generation (SHG) and a dichroic output coupler mirror (OC) that is highly reflective for the second harmonic (SH) and partially reflective for the fundamental wave (FW). The NLM device (SHG crystal + dichroic OC) thus provides a saturable reflectivity enabling modelocked operation. Our first NLM-modelocked TDL delivered <30 W with pulse durations >323 fs at a repetition rate of 17.8 MHz. Here we present a power-scaled NLM-modelocked TDL delivering 66 W and 430 fs pulses at 9.3 MHz, and up to 87 W and 586 fs pulses at 8.9 MHz. We thereby improve the output average power by a factor ≈3 and the peak power by a factor ≈5. This corresponds to 3 orders of magnitude more peak power than NLM results based on bulk-crystal lasers. We furthermore identify stable modelocking regimes that avoid Q-switching instabilities.
关键词： modelocking,thin-disk lasers,ultrafast lasers,nonlinear mirror,power scaling
更新于2025-09-11 14:15:04
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A power scalable 2–10?Gb/s PI-based clock data recovery for multilane applications
摘要： This paper presents a power scalable clock data recovery (CDR) suitable for multilane and multirate applications. To make the power consumption scale with the data rate and guarantee appropriate edge overlaps for the phase interpolation, a delay-locked loop-based global biasing strategy is proposed to automatically adjust the bandwidth of the current-mode logic buffers and phase interpolator (PI). The I, Q clocks are generated by a local clock conditioner, which employs an open-loop voltage-controlled delay line to produce the evenly spaced multiple phases and adopts a two-stage timing averaging to correct the duty cycle distortion and I, Q mismatch. Additionally, a phase-compensating technique is adopted in the PI to optimize its linearity. Implemented in a 65-nm CMOS process with an area occupation of 0.12 mm2, the presented CDR can operate from 2 to 10 Gb/s with a scalable power consumption from 11 to 42 mW. When it operates at 10 Gb/s, the maximum tolerable amplitude of the sinusoidal jitter at 50 MHz is 0.52 UIpp, and the total jitter of the recovered clock is 16.6 ps at a BER of 1e-12.
关键词： Clock data recovery (CDR),Timing averaging (TA),Local clock conditioner,Voltage-controlled delay line (VCDL),Power scaling,Phase interpolator (PI),Global biasing strategy
更新于2025-09-10 09:29:36