Green-pumped, picosecond MgO:PPLN optical parametric oscillator

Kienle, Florian; Lin, Di; Alam, Shaif-ul; Hung, H.S.S.; Gawith, C.B.E.; Major, Huw E.; Richardson, David J.; Shepherd, D.P.

doi:10.1364/josab.29.000144

Cited by 25 publications

(16 citation statements)

References 35 publications

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“…Here, we exploit the quasi-phase-matched material, MgO-doped periodically poled LiNbO 3 (MgO:PPLN) crystal, to build a single resonant OPO pumped by a frequency-doubled fiber laser at 532 nm with pump powers less than 800 mW. MgO:PPLN offers large nonlinear coefficient ( ) and phase matching can be tuned both by temperature tuning and grating period tuning [15]. Periodically poled LiTaO 3 (PPLT) is another widely used nonlinear material to realize OPOs for the visible and NIR, which offers higher damage threshold than MgO:PPLN for its increased resistance to photorefractive damage and greeninduced infrared absorption [16].…”

Section: Introductionmentioning

confidence: 99%

Femtosecond OPO based on MgO:PPLN synchronously pumped by a 532 nm fiber laser

Cao¹,

Shen²,

Zheng³

et al. 2017

Laser Phys.

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With the rapid progress in fiber technologies, femtosecond fiber lasers, which are compact, cost-effective and stable, have been developed and are commercially available. Studies of optical parametric oscillators (OPOs) pumped by this type of laser are demanding. Here we report a femtosecond optical parametric oscillator (OPO) at 79.6 MHz repetition rate based on MgO-doped periodically poled LiNbO 3 (MgO:PPLN), synchronously pumped by the integrated second harmonic radiation of a femtosecond fiber laser at 532 nm. The signal delivered by the single resonant OPO is continuously tunable from 757 to 797 nm by tuning the crystal temperature in a poling period of µ 7.7 m. The output signal shows good beam quality in TEM 00 mode profile with pulse duration of 206 fs at 771 nm. Maximum output signal power of 71 mW is obtained for a pump power of 763 mW and a low pumping threshold of 210 mW is measured. Moreover, grating tuning and cavity length tuning of the signal wavelength are also investigated.

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Section: Introductionmentioning

confidence: 99%

Femtosecond OPO based on MgO:PPLN synchronously pumped by a 532 nm fiber laser

Cao¹,

Shen²,

Zheng³

et al. 2017

Laser Phys.

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“…Many OPO architectures have been developed (Kienle et al, ; Fischer and Kulevskii ), the most spread ones being free‐space based. Given that such sources are subject to mechanical drifts and photodamages caused by dust, for example, intense research aims at developing fiber‐based OPO systems, as much on for the pumping laser (Cleff et al, ) as well as for the OPO structure itself (Südmeyer et al, ).…”

Section: Introductionmentioning

confidence: 99%

Application of a high power Yb fiber‐based laser compatible with commercial optical parametric oscillator for coherent anti‐stokes raman scattering microscopy

Hage¹,

Boisset²,

Ibrahim

et al. 2014

Microscopy Res & Technique

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Coherent anti-Stokes Raman scattering (CARS) microscopy is a powerful tool for chemical analysis at a subcellular level, frequently used for imaging lipid dynamics in living cells. We report a high-power picosecond fiber-based laser and its application for optical parametric oscillator (OPO) pumping and CARS microscopy. This fiber-based laser has been carefully characterized. It produces 5 ps pulses with 0.8 nm spectral width at a 1,030 nm wavelength with more than 10 W of average power at 80 MHz repetition rate; these spectral and temporal properties can be slightly modified. We then study the influence of these modifications on the spectral and temporal properties of the OPO. We find that the OPO system generates a weakly spectrally chirped signal beam constituted of 3 ps pulses with 0.4 nm spectral width tunable from 790 to 930 nm optimal for CARS imaging. The frequency doubling unconverted part is composed of 7-8 ps pulses with 0.75 nm spectral width compatible with CARS imaging. We also study the influence of the fiber laser properties on the CARS signal generated by distilled water. In agreement with theory, we find that shorter temporal pulses allow higher peak powers and thus higher CARS signal, if the spectral widths are less than 10 cm(-1) . We demonstrate that this source is suitable for performing CARS imaging of living cells during several hours without photodamages. We finally demonstrate CARS imaging on more complex aquatic organisms called copepods (micro-crustaceans), on which we distinguish morphological details and lipid reserves.

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“…Here tensor symmetry (2) (2) χ χ ijl ilj = is taken into account and (2) χ 2 im ijl d = is effective nonlinearity with indices , , 1,3 i j l = 1, 6 m = .…”

Section: Introductionmentioning

confidence: 99%

“…Then the second harmonic intensity I 2ω will be proportional to the squares of L, χ (2) and first harmonic intensity I ω :…”

Section: Introductionmentioning

confidence: 99%