40-fs Yb^3+:CaGdAlO_4 laser pumped by a single-mode 350-mW laser diode

Agnesi, Antonio; Greborio, Alessandro; Pirzio, Federico; Reali, G.; Au, J. Aus der; Guandalini, A.

doi:10.1364/oe.20.010077

Cited by 80 publications

(39 citation statements)

References 12 publications

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“…% doped crystal [16]. In low-power bulk modelocked lasers, pulses as short as 47 fs with 38 mW average output power [17] and 40 fs with 15 mW [18] were demonstrated. In both cases, extracavity dispersion management was required to reach the shortest pulses.…”

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confidence: 99%

SESAM mode-locked Yb:CaGdAlO_4 thin disk laser with 62 fs pulse generation

et al. 2013

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We present a semiconductor saturable absorber mirror (SESAM) mode-locked thin disk laser (TDL) based on Yb:CaGdAlO 4 (Yb:CALGO) generating 62 fs pulses, which is the shortest pulse duration achieved from mode-locked TDLs to date. The oscillator operates at a repetition rate of 65 MHz and delivers 5.1 W of average output power. The short pulse duration of our TDL in combination with the high intracavity peak power of 44 MW makes this oscillator attractive for intracavity table-top extreme nonlinear optics applications such as high harmonic generation and vacuum ultraviolet frequency comb generation. The current average power was limited by the quality of the Yb:CALGO disk. However, power scaling of Yb:CALGO TDLs to the multi-10-W range with short pulse durations (<100 fs) appears feasible in the near future by using thinner disks of better quality and further optimized SESAMs.OCIS One interesting aspect of TDLs is the high intracavity peak power which can be realized because the output coupler typically has values in the order of 10%. This intracavity peak power should allow for extreme nonlinear frequency conversion such as high harmonic generation (HHG). Realizing those experiments at a high repetition rate in the MHz regime, typically obtained with ultrafast TDLs, is highly desirable for an improved signal-to-noise ratio and to reduce acquisition times in high field laser physics. However, for efficient operation, HHG typically requires peak intensities of >10 13 W∕cm 2 (i.e., peak powers of >30 MW for a spot diameter of 25 μm) in combination with short pulse durations <100 fs [8][9][10] [ Fig. 1(c)]. State of the art mode-locked TDLs are typically based on the well-established gain material Yb:YAG, which has only reached the 200-fs-regime so far with a Kerr lens mode-locked TDL setup [ 11].Therefore, there is a strong research effort in extending the record performance of mode-locked TDLs to the sub-100-fs regime [ Fig. 1(a)], and overcoming the tradeoff between pulse duration and average output power [ Fig. 1(b)] with novel broadband thin disk gain materials that meet the spectroscopic and thermomechanical requirements [12 , 13]. In the past years, many Yb-doped gain materials have been investigated toward this goal. In particular, cubic sesquioxides have demonstrated their

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confidence: 99%

SESAM mode-locked Yb:CaGdAlO_4 thin disk laser with 62 fs pulse generation

et al. 2013

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“…A comparison of performance of the diode-pumped Yblasers in the sub-100 fs regime is shown in Figure 3. As can be seen, the generated 56 fs pulses with 450 kW of peak power in our work demonstrate more than one order of magnitude higher average and peak powers when compared to the previous sub-60 fs diode-pumped Yb-lasers [37][38][39][40][41][42]. We believe that such a powerful ultrashort pulse laser source will be attractive for nonlinear frequency conversion into the visible and near-infrared ranges [43][44][45].…”

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confidence: 57%

Diode-pumped ultrafast Yb:KGW laser with 56 fs pulses and multi-100 kW peak power based on SESAM and Kerr-lens mode locking

2017

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A high power sub-60 fs mode-locked diodepumped Yb:KGW laser based on hybrid action of an InGaAs quantum-dot saturable absorber mirror and Kerr-lens mode locking was demonstrated. The laser delivered a 56 fs pulse with 1.95 W of average power corresponding 450 kW of peak power. The width of the generated laser spectrum was 20.5 nm, which was near the gain bandwidth limit of the Yb:KGW crystal. To the best of our knowledge, these are the shortest pulses generated from the monoclinic double tungstate crystals (and Yb:KGW laser crystal in particular) and the most powerful in the sub-60 fs regime. At the same time, they are also the shortest pulses produced to date with the help of a quantum-dot-based saturable absorber. High power operation with a pulse duration of 90 fs and 2.85 W of average output power was also demonstrated.

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“…Shorter pulses (135 fs) could only be achieved at a moderate average power of 1.3 W. The available doping concentrations and thickness of the crystal limits the average power in this first experiment. Nevertheless, this material is one of the most interesting candidates for power scaling of modelocked TDLs with short pulses, in particular given the very promising results obtained with bulk modelocked lasers based on this material [89,90].…”

Section: State-of-the Art and Recent Experimental Resultsmentioning

confidence: 99%

Cutting-Edge High-Power Ultrafast Thin Disk Oscillators

et al. 2013

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A growing number of applications in science and industry are currently pushing the development of ultrafast laser technologies that enable high average powers. SESAM modelocked thin disk lasers (TDLs) currently achieve higher pulse energies and average powers than any other ultrafast oscillator technology, making them excellent candidates in this goal. Recently, 275 W of average power with a pulse duration of 583 fs were demonstrated, which represents the highest average power so far demonstrated from an ultrafast oscillator. In terms of pulse energy, TDLs reach more than 40 μJ pulses directly from the oscillator. In addition, another major milestone was recently achieved, with the demonstration of a TDL with nearly bandwidth-limited 96-fs long pulses. The progress achieved in terms of pulse duration of such sources enabled the first measurement of the carrier-envelope offset frequency of a modelocked TDL, which is the first key step towards full stabilization of such a source. We will present the key elements that enabled these latest results, as well as an outlook towards the next scaling steps in average power, pulse OPEN ACCESSAppl. Sci. 2013, 3 356 energy and pulse duration of such sources. These cutting-edge sources will enable exciting new applications, and open the door to further extending the current performance milestones.

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40-fs Yb^3+:CaGdAlO_4 laser pumped by a single-mode 350-mW laser diode

Cited by 80 publications

References 12 publications

SESAM mode-locked Yb:CaGdAlO_4 thin disk laser with 62 fs pulse generation

SESAM mode-locked Yb:CaGdAlO_4 thin disk laser with 62 fs pulse generation

Diode-pumped ultrafast Yb:KGW laser with 56 fs pulses and multi-100 kW peak power based on SESAM and Kerr-lens mode locking

Cutting-Edge High-Power Ultrafast Thin Disk Oscillators

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