Femtosecond SESAM-modelocked Cr:ZnS laser

Sorokin, Evgeni; Tolstik, Nikolai; Schaffers, Kathleen I.; Sorokina, Irina T.

doi:10.1364/oe.20.028947

Cited by 47 publications

(32 citation statements)

References 25 publications

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“…The mid-infrared part of the optical spectrum is of paramount importance for molecular spectroscopy as the fundamental rotovibrational bands of most light molecules lie in this spectral range, with absorption strength orders of magnitude higher than in the visible or near-infrared 10 . Different approaches have been pursued to obtain mid-infrared frequency combs 11 , directly using transition metals incorporated into chalcogenide hosts 12,13 or Thulium-doped silica fibre lasers 14 , or indirectly using nonlinear conversion of nearinfrared frequency combs [15][16][17][18][19][20] . However, these techniques tend to lead to relatively large set-up footprints, with the exception perhaps of microresonator-based combs that recently achieved operation in the mid-infrared [21][22][23] .…”

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Dual-comb spectroscopy based on quantum-cascade-laser frequency combs

et al. 2014

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Dual-comb spectroscopy performed in the mid-infrared-where molecules have their strongest rotovibrational absorption lines-offers the promise of high spectral resolution broadband spectroscopy with very short acquisition times (ms) and no moving parts. Recently, we demonstrated frequency comb operation of a quantum-cascade-laser. We now use that device in a compact, dual-comb spectrometer. The noise properties of the heterodyne beat are close to the shot noise limit. Broadband (15 cm À 1 ) high-resolution (80 MHz) absorption spectroscopy of both a GaAs etalon and water vapour is demonstrated, showing the potential of quantum-cascade-laser frequency combs as the basis for a compact, all solid-state, broadband chemical sensor.

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Dual-comb spectroscopy based on quantum-cascade-laser frequency combs

et al. 2014

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“…Combination of anomalous dispersion of ZnS, normal dispersion of sapphire and a chirped mirror [1,11,19] allowed to obtain relatively flat GDD curve with total net GDD per cavity roundtrip about -450 fs 2 at central wavelength (Fig. 3).…”

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Kerr-lens mode-locked Cr:ZnS laser

Tolstik¹,

Sorokin²,

Sorokina³

2013

Opt. Lett.

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Received Month X, XXXX; revised Month X, XXXX; accepted Month X, XXXX; posted Month X, XXXX (Doc. ID XXXXX); published Month X, XXXX We report the soft-aperture Kerr-lens mode-locked Cr:ZnS laser, generating 550 mW of 69-fs nearly transform-limited pulses at 2.39 µm wavelength. The pulse energy reached 3.8 nJ at 145 MHz repetition rate, limited by the onset of doublepulsing. This corresponds to the shortest-pulse and highest-energy direct femtosecond laser source in the mid-IR. Dispersion compensation was achieved by a single chirped mirror and a thin sapphire plate, making the laser design simple, compact and very stable, operating at ambient air and room temperature. The superb thermal and mechanical properties of Cr:ZnS, exceeding those of Cr:ZnSe and many established femtosecond laser crystals should allow further scaling of output power.

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“…This technique is well-established in fiber [4] and Ti-sapphire lasers [5,6], and has recently been demonstrated with the Cr:YAG [7] and Yb-doped thin-disk lasers [8,9]. For Cr:ZnSe the analytical theory [10] predicts pulse energies up to 0.5 µJ [11] and initial demonstration of CPO technique has already been performed for Cr:ZnSe as well as Cr:ZnS lasers [12]. In the mid-IR, pulses with 8 nJ energy have been demonstrated recently in a KLM mode-locked Cr:ZnS laser [13].…”

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confidence: 99%