Ultrafast, solid-state oscillators based on broadband, multisite Yb-doped crystals

Pirzio, Federico; Kemnitzer, M.; Guandalini, A.; Kienle, Florian; Veronesi, S.; Tonelli, M.; Au, J. Aus der; Agnesi, Antonio

doi:10.1364/oe.24.011782

Cited by 22 publications

(13 citation statements)

References 19 publications

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“…The PVBs are distinct from the vortex beams with patterns of spots arrays located on the triangle-, square-, and parallelogram-shaped routes [namely polygonal-spotsarray vortex beams (PSA-VBs)] in normal degenerate states as reported before [27][28][29]. In order to obtain a stable QFD state, Yb:CALGO crystal is used as the gain medium in our resonator for its extremely broad emission band [34][35][36]. The profile of PVB or PSA-VB as well as the OAM can be controlled by adjusting the cavity length and the position of pump spot.…”

Section: Introductionmentioning

confidence: 85%

Generation of polygonal vortex beams in quasi-frequency- degenerate states of Yb:CALGO laser

Shen

Wan

Meng

et al. 2018

Laser Congress 2018 (ASSL)

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We originally demonstrate the vortex beams with patterns of closed polygons [namely polygonal vortex beams (PVBs)] generated by a quasi-frequency-degenerate (QFD) Yb:CALGO laser resonator with astigmatic transformation. The PVBs with peculiar patterns of triangular, square, and parallelogram shapes carrying large orbital angular momentums (OAMs) are theoretically investigated and experimentally obtained in the vicinity of the SU (2) degenerate states of laser resonator. The PVBs in QFD states are compared with the vortex beams with patterns of isolated spots arrays located on the triangle-, square-, and parallelogram-shaped routes [namely polygonalspots-array vortex beams (PSA-VBs)] under normal SU(2) degenerate states. Beam profile shape of PVB or PSA-VB and OAM can be controlled by adjusting the cavity length and the position of pump spot. The simulated and experimental results validate the performance of our methodto generate PVB, which is of great potential for promoting novel technologies in particle trapping and beam shaping.

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Section: Introductionmentioning

confidence: 85%

Generation of polygonal vortex beams in quasi-frequency- degenerate states of Yb:CALGO laser

Shen

Wan

Meng

et al. 2018

Laser Congress 2018 (ASSL)

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“…The success of optical frequency combs in the nearinfrared has strongly been tied to the advancement of modelocked lasers in that wavelength range [1][2][3][4][5]. Wellestablished gain media include Ti:sapphire [6] emitting around 800 nm, and various host crystals doped with Ytterbium (Yb) or Erbium (Er) emitting in the 1 µm and 1.5 µm region, respectively [7][8][9]. Various approaches have recently been pursued to extend the spectral coverage of frequency combs into the mid-infrared [10].…”

Section: Introductionmentioning

confidence: 99%

Offset-Free Gigahertz Midinfrared Frequency Comb Based on Optical Parametric Amplification in a Periodically Poled Lithium Niobate Waveguide

et al. 2016

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We report the generation of an optical frequency comb in the mid-infrared with 1-GHz comb line spacing and no offset with respect to absolute zero frequency. This comb is tunable from 2.5-4.2 µm and covers a critical spectral region for important environmental and industrial applications such as molecular spectroscopy of trace gases. We obtain such a comb by highly efficient frequency conversion of a near-infrared frequency comb based on a compact diode-pumped SESAM-modelocked Yb:CALGO laser operating at 1 µm. The frequency conversion process is based on optical parametric amplification (OPA) in a periodically-poled lithium niobate (PPLN) chip containing buried waveguides fabricated by reverse proton exchange (RPE). The laser with a repetition rate of 1 GHz is the only active element of the system. It provides the pump pulses for the OPA process as well as seed photons in the range of 1.4-1.8 µm via supercontinuum generation (SCG) in a silicon nitride (Si3N4) waveguide. Both the PPLN and Si3N4 waveguides represent particularly suitable platforms for low-energy nonlinear interactions; they allow for mid-IR comb powers per comb line at the microwatt-level and signal amplification levels up to 35 dB with 2 orders of magnitude less pulse energy than reported in OPA systems using bulk devices. Based on numerical simulations, we explain how high amplification can be achieved at low energy using the interplay between mode confinement and a favorable group velocity mismatch configuration where the mid-IR pulse moves at the same velocity as the pump.

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“…In this Letter, we originally exploit the multi-frequency emission and spectral modulation effects coupled with TML in an FDC. A new crystal Yb:CaGdAlO 4 (Yb: CALGO) was used as the gain medium in a plano-concave FDC for allowing a broadband spectrum output, taking advantage of its extremely large gain bandwidth [13,14] . Besides the large gain bandwidth, Yb:CALGO also possess advantages of high thermal conductivity and low refractiveindex-temperature gradient [13,15] , which are beneficial to the laser performance and stability.…”

mentioning

confidence: 99%

“…A new crystal Yb:CaGdAlO 4 (Yb: CALGO) was used as the gain medium in a plano-concave FDC for allowing a broadband spectrum output, taking advantage of its extremely large gain bandwidth [13,14] . Besides the large gain bandwidth, Yb:CALGO also possess advantages of high thermal conductivity and low refractiveindex-temperature gradient [13,15] , which are beneficial to the laser performance and stability. When the cavity was adjusted to the FDS jΩ ¼ 1∕4i, the output spectrum could transform from a smooth peak with a bandwidth of 6.2 nm to a multi-peak shape; meanwhile, the transverse pattern transformed to an exotic wave-packet profile under certain off-axis displacement.…”

mentioning

confidence: 99%

Observation of spectral modulation coupled with broadband transverse-mode-locking in an Yb:CALGO frequency-degenerate cavity

Shen

Wan

et al. 2019

中国光学快报

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A frequency-degenerate cavity (FDC) is the resonator that the ratio of transverse and longitudinal mode frequency spacings is a simple rational number. When an optical resonator is close to the FDC, transverse-mode-locking (TML) takes place with drastic changes of laser mode. We report for the first time, to the best of our knowledge, the multi-frequency emission and spectral modulation effects coupled with TML in FDC. The Yb:CaGdAlO 4 (Yb:CALGO) crystal with large gain bandwidth was used as a gain medium in an off-axis-pumped hemispherical FDC for realizing broadband emission. Interestingly, the spectrum can transform from a single smooth packet shape to a multi-peak structure; meanwhile, the transverse pattern accordingly transforms into some exotic wave-packet profiles through controlling off-axis displacement in a special degenerate state.

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Ultrafast, solid-state oscillators based on broadband, multisite Yb-doped crystals

Cited by 22 publications

References 19 publications

Generation of polygonal vortex beams in quasi-frequency- degenerate states of Yb:CALGO laser

Generation of polygonal vortex beams in quasi-frequency- degenerate states of Yb:CALGO laser

Offset-Free Gigahertz Midinfrared Frequency Comb Based on Optical Parametric Amplification in a Periodically Poled Lithium Niobate Waveguide

Observation of spectral modulation coupled with broadband transverse-mode-locking in an Yb:CALGO frequency-degenerate cavity

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