Ultrafast second-Stokes diamond Raman laser

Murtagh, Michelle; Lin, Jipeng; Trägårdh, Johanna; McConnell, Gail; Spence, David J.

doi:10.1364/oe.24.008149

Cited by 11 publications

(12 citation statements)

References 18 publications

(24 reference statements)

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“…It can be seen from Figure 8a,b that SRS generation was observed only in a narrow range of the positive cavity length detuning from 0 up to +50 µm while the detuning range was essentially wider at the negative cavity length detuning (from 0 down to −220 µm). It is similar as in other synchronously pumped Raman lasers [65][66][67][68][69][70][71][72][73][74][75][76][77][78] and can be explained by non-efficient interaction between the pump and SRS pulses when only the leading edge of the SRS pulse is amplified at positive detuning. However, namely positive detuning (up to +50 µm) of the cavity length has allowed to obtain the strongest SRS pulse shortening, as can be seen from Figure 8c,d.…”

Section: Experimental Results Of Srs Lasingsupporting

confidence: 81%

“…The individual pump pulses can be shorter than τ c and even ultra-short realizing transient SRS in a cavity. Such systems are synchronously pumped Raman lasers [67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82]. If we use a train of ultra-short pulses with the pulse train duration of t p at the individual pulse duration of τ p , the extracavity synchronously pumped SRS oscillation threshold will be defined by expression (12) where τ p should be replaced with t p and p = 1 for both ring and linear cavities (at τ p < τ c we have gain only in the forward direction) but the SRS gain G (and its threshold value G th in expression (12)) is defined by τ p as before by expression (8).…”

Section: Theoretical Approachmentioning

confidence: 99%

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Stimulated Raman Scattering in Alkali-Earth Tungstate and Molybdate Crystals at Both Stretching and Bending Raman Modes under Synchronous Picosecond Pumping with Multiple Pulse Shortening Down to 1 ps

et al. 2019

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Comparative investigation of characteristics of spontaneous and stimulated Raman scattering (SRS) in different alkali-earth tungstate and molybdate crystals at both high and low frequency anionic group vibrations is presented. It has been found that, among these crystals, the SrMoO4 and SrWO4 crystals are the most perspective for SRS generation on both stretching and bending modes of internal anionic group vibrations with the strongest SRS pulse shortening under synchronous laser pumping because of not only highly intense stretching mode Raman line for efficient primary extra cavity long-shifted SRS conversion but also the widest bending mode Raman line for the strongest SRS pulse shortening down to the inverse width of the widest Raman line (~1 ps) at secondary intracavity short-shifted SRS conversion. The strongest 26-fold pump pulse shortening down to 1.4 ps at the Stokes component with the combined Raman shift in the synchronously pumped extra cavity SrMoO4 and SrWO4 Raman lasers has been demonstrated. It was found that synchronously pumped cascade SRS with combined Raman shift is more efficient in the SrWO4 crystal because the bending mode Raman line is more intense relative to the stretching mode Raman line than that in SrMoO4.

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Section: Experimental Results Of Srs Lasingsupporting

confidence: 81%

Section: Theoretical Approachmentioning

confidence: 99%

Stimulated Raman Scattering in Alkali-Earth Tungstate and Molybdate Crystals at Both Stretching and Bending Raman Modes under Synchronous Picosecond Pumping with Multiple Pulse Shortening Down to 1 ps

et al. 2019

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“…The spectra were measured using an optical spectrum analyzer (HP 86,140 A). The second-Stokes wavelength was not always exactly two Stokes shifts longer than the pump center wavelength owing to spectral broadening of the Stokes field by self-phase modulation (Murtagh et al, 2015 b ). The output power of the second-Stokes emission is shown in Figure 2b and was up to 80 mW, making the laser suitable for two-photon imaging of biological specimens.…”

Section: Methodsmentioning

confidence: 99%

“…The laser described allows tuning of the second-Stokes emission to 1,200 nm, for a pump wavelength of 900 nm. Femtosecond (fs) diamond Raman lasers emitting first-Stokes (Murtagh et al, 2015; Lin & Spence, 2016) and, more recently, second-Stokes (Murtagh et al, 2015 b ) radiation have been demonstrated, but have, to our knowledge, not been used for imaging. Analogous synchronously pumped fiber Raman lasers have also recently been developed (Churin et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Two-Color, Two-Photon Imaging at Long Excitation Wavelengths Using a Diamond Raman Laser

et al. 2016

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“…The majority of these studies were carried out in the steady-state mode, when the pump pulse duration is longer than the dephasing time in diamond. Less work has been done on the transient mode, when the pulse duration is shorter than the dephasing time: DRLs under femtosecond (fs) pumping in synchronously-pumped cavities has been demonstrated [2], and supercontinuum (SC) generation in diamond under fs pumping has been reported [3]. The major mechanism for SC generation under fs laser pumping is believed to be self-phase modulation (SPM).…”

mentioning

confidence: 99%

Femtosecond frequency conversion in diamond under Gaussian and Bessel beam pumping

Savitski

Birch

Reilly

et al. 2017

2017 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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Diamond Raman lasers (DRLs) have been the subject of extensive research in the recent years. Continuouswave and pulsed, intra-and extra-cavity DRLs emitting from UV to IR have been demonstrated [1]. The majority of these studies were carried out in the steady-state mode, when the pump pulse duration is longer than the dephasing time in diamond. Less work has been done on the transient mode, when the pulse duration is shorter than the dephasing time: DRLs under femtosecond (fs) pumping in synchronously-pumped cavities has been demonstrated [2], and supercontinuum (SC) generation in diamond under fs pumping has been reported [3]. The major mechanism for SC generation under fs laser pumping is believed to be self-phase modulation (SPM). It has been shown before that this effect can be significantly reduced when using the Bessel beam pumping. In this work we present a first comparison study of the effect of Gaussian and Bessel pump beams on the spectral properties of nonlinear frequency conversion in diamond in transient mode.Laser pulses at 800 nm with duration of 150 fs with the maximum pulse energy of 1 mJ were used as a pump. An uncoated diamond crystal with a length of 6.5 mm along the <110> axis and an absorption coefficient at 1064 nm measured to be ~0.03 cm -1 was placed either at the focus of a 50 mm focal length spherical lens or ~1.3 cm from the tip of an axicon with 20° wedge angle. The pump spot diameter of the Gaussian / Bessel beam was calculated to be ~ 5 m / ~3.6 m in each case. Pulse energy of the output was measured after a long pass filter with a cut-on wavelength of 850 nm.Under Gaussian beam pumping SC generation was observed, similar to the results in [3], with the cut off wavelength of ~525 nm ( Fig. 1 (a)). On the long wavelength side the measurements were limited to 1025 nm by the available spectrometer. A peak, corresponding to the 1 st Raman Stokes at ~895 nm, appeared in the emission spectra at pump pulse energies >2.5 J. The output pulse energy had an almost linear dependence on the pump energy ( Fig. 1 (a), inset).In case of Bessel beam pumping the output spectrum consisted mainly of Raman Stokes and anti-Stokes lines ( Fig. 1 (b)). 1 st and 2 nd Stokes lines were concentrated in the centre of the beam emitted by the diamond, while anti-Stokes emission propagated in the first and second rings. The output pulse energy saturated at ~55 J of pump pulse energy ( Fig. 1 (b), inset). This dependence is similar to the one observed under the impulsive stimulated Raman scattering, when the pump pulse duration is shorter than the vibrational period in a crystal, although in our case the pulse duration was 6 times longer than the vibrational period in diamond.Significantly lower conversion efficiencies of the pump emission with the Bessel beam (0.6%) in comparison with that with the Gaussian beam (~33%) can be attributed to the fact that according to our calculations the central maximum of the Bessel beam contained only 0.3% of the total pump power. The difference in spectral characteristics ...

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Ultrafast second-Stokes diamond Raman laser

Cited by 11 publications

References 18 publications

Stimulated Raman Scattering in Alkali-Earth Tungstate and Molybdate Crystals at Both Stretching and Bending Raman Modes under Synchronous Picosecond Pumping with Multiple Pulse Shortening Down to 1 ps

Stimulated Raman Scattering in Alkali-Earth Tungstate and Molybdate Crystals at Both Stretching and Bending Raman Modes under Synchronous Picosecond Pumping with Multiple Pulse Shortening Down to 1 ps

Two-Color, Two-Photon Imaging at Long Excitation Wavelengths Using a Diamond Raman Laser

Femtosecond frequency conversion in diamond under Gaussian and Bessel beam pumping

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