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| 10. |
- Baek, I. H., et al.
(författare)
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Passive mode-locking of a Ti: Sapphire laser using low-dimensional carbon nanostructures
- 2011
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Ingår i: Int. Quantum Electron. Conf., IQEC Conf. Lasers Electro-Opt., CLEO Pac. Rim. Incorporating Australas. Conf. Opt., Lasers Spec. - 9780977565771 ; , s. 1154-1155
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Konferensbidrag (refereegranskat)abstract
- We report on passive mode-locking of a Ti:sapphire laser employing novel saturable absorbers based on low-dimensional carbon nanostructures such as single-walled carbon nanotubes and monolayer graphene. The mode-locked operation with both saturable absorbers were characterized and compared to pure Kerr-lens mode-locking.
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| 11. |
- Baek, In Hyung, et al.
(författare)
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Single-walled carbon nanotube saturable absorber assisted high-power mode-locking of a Ti:sapphire laser
- 2011
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Ingår i: Optics Express. - 1094-4087. ; 19:8, s. 7833-7838
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Tidskriftsartikel (refereegranskat)abstract
- We report on passive mode-locking of a Ti:sapphire laser employing a single-walled carbon nanotube saturable absorber (SWCNT-SA) specially designed and fabricated for wavelengths near 800 nm. Mode-locked pulses as short as 62 fs were generated at a repetition rate of 99.4 MHz. We achieved output powers from the SWCNT-SA mode-locked laser as high as 600 mW with a slope efficiency of 26%. The characteristics of SWCNT-SA-assisted mode-locking were compared with those of Kerr-lens mode-locking without SWCNT-SA.
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| 12. |
- Bertani, Stefano, et al.
(författare)
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Stretching-tunable external-cavity laser locked by an elastic silicone grating
- 2006
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Ingår i: Optics Express. - 1094-4087. ; 14:25, s. 11982-11986
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate wavelength locking of a diode laser at 760 nm with feedback from an elastic transmission grating in the Littrow configuration. The laser was in a single longitudinal mode with a side-mode suppression of 20 dB. By stretching the grating the laser could be tuned over a few nm. The grating was fabricated in a silicone elastomer ( polydimethylsiloxane) by a moulding technique, and coated by a thin layer of Ti and Au to achieve an increased diffraction efficiency needed for efficient locking.
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| 14. |
- Bjurshagen, Stefan, et al.
(författare)
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Crystal growth, spectroscopic characterization, and eye-safe laser operation of erbium- And ytterbium-codoped KLu(WO4)2
- 2008
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Ingår i: Applied Optics. - 1559-128X. ; 47:5, s. 656-665
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Tidskriftsartikel (refereegranskat)abstract
- Erbium (Er)- and Ytterbium (Yb)-codoped monoclinic KLu(WO4) 2 single crystals were grown by top seeded solution growth-slow cooling method for several different doping concentrations. Growth parameters have been optimized to obtain macrodefect-free single crystals. Er energy levels involved in the 4I13/2 → 4I 15/2 were determined by 6 K polarized optical absorption. The maximum emission cross section for this electronic transition has been evaluated, being 2.85 × 10-20 cm2 for E||Nm at 1535 nm. Laser oscillation in the 1.5 μm range was obtained by pumping the Yb ion at 980 nm and sensitizing Er. The maximum output power achieved was 152 mW, with 1.2% slope efficiency.
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| 15. |
- Bjurshagen, Stefan, et al.
(författare)
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Fluorescence dynamics and rate equations analysis in Er3+,Yb3+ doped double tungstates
- 2006
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Ingår i: Applied Optics. - 1559-128X .- 2155-3165. ; 45:19, s. 4715-4725
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Tidskriftsartikel (refereegranskat)abstract
- The fluorescence dynamics in Er3+ and Yb3+ doped KGd(WO4)(2) and KY(WO4)(2) has been investigated. Lifetimes have been measured for the Yb(F-2(5/2)), Er(I-4(13/2)), and Er(S-4(3/2)) levels around 1, 1.5, and 0.55 mu m, respectively. The Yb(F-2(5/2)) lifetimes show a decreasing trend toward the limiting Er(I-4(11/2)) lifetime with increasing Er-to-Yb concentration ratio, whereas the Er(I-4(13/2)) lifetimes are mostly unaffected by the doping concentrations. A rate equation analysis has been performed to explain the observed behavior and gain is calculated for a continuous-wave laser at 1.53 mu m to find the optimum doping concentrations for high gain.
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| 16. |
- Bolanos, Western, et al.
(författare)
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Epitaxial layers of KY1-x-yGdxLuy(WO4)(2) doped with Er3+ and Tm3+ for planar waveguide lasers
- 2010
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Ingår i: Optical materials (Amsterdam). - : Elsevier BV. - 0925-3467 .- 1873-1252. ; 32:3, s. 469-474
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Tidskriftsartikel (refereegranskat)abstract
- Here we show the results we obtained in the fabrication of planar wave guide lasers based on monoclinic double tungstates doped with Er3+ and Tm3+. We have successfully introduced these ions into the lattice matched KY0.59Gd0.19Lu0.22(WO4)(2) epitaxial layers grown on KY(WO4)(2) substrates without loss of optical quality and keeping a high refractive index contrast between the epitaxial layer and the substrate. We characterized the waveguiding properties of these epitaxial layers at lambda = 632.8 nm by dark modes spectroscopy, and we showed that these waveguides can support several TE and TM modes. Spectroscopic characterization of the active lanthanide ions in these crystals is also presented.
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| 18. |
- Boyko, Andrey A., et al.
(författare)
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High-energy, narrowband, non-resonant PPKTP optical parametric oscillator
- 2022
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Ingår i: Nonlinear Frequency Generation and Conversion. - : SPIE - International Society for Optical Engineering.
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Konferensbidrag (refereegranskat)abstract
- We present a narrowband, non-resonant optical parametric oscillator based on 5-mm thick Rb-doped periodically-poled KTiOPO4 (PPKTP) operating in the high-energy/low repetition-rate regime. An uncoated volume Bragg grating (VBG) is employed as one of the cavity mirrors reflecting only the signal whereas the other cavity mirror is reflecting only the idler. Pumping by a Nd:YAG laser at 1.0642 mu m in a double-pass, the signal plus idler output energy reached almost 5 mJ at a repetition rate of 100 Hz corresponding to a conversion efficiency of similar to 26%. Both signal and idler are narrowband with full width at half maximum (FWHM) of 0.5 nm at 1942 nm and 0.76 nm at 2355 nm, respectively.
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| 19. |
- Boyko, A. A., et al.
(författare)
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Intracavity difference-frequency mixing of OPO signal and idler pulses in BaGa4Se7
- 2017
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Ingår i: Optics InfoBase Conference Papers. - : Optical Society of America. - 9781943580279
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Konferensbidrag (refereegranskat)abstract
- An overall quantum conversion efficiency of 7.8% is achieved by intracavity mixing the signal and idler of a 1.064-μm pumped Rb:PPKTP OPO in BaGa4Se7, generating >0.7 mJ pulse energy at ~7 μm and 100 Hz.
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| 20. |
- Boyko, Andrey A., et al.
(författare)
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Intracavity difference-frequency mixing of optical parametric oscillator signal and idler pulses in BaGa4Se7
- 2017
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Ingår i: Applied Optics. - : OPTICAL SOC AMER. - 1559-128X .- 2155-3165. ; 56:10, s. 2783-2786
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Tidskriftsartikel (refereegranskat)abstract
- An overall quantum conversion efficiency of 7.8% is achieved by intracavity mixing the signal and idler of a 1.064 mu m pumped Rb: PPKTP optical parametric oscillator in BaGa4Se7. In this way, a pulse energy of similar to 0.71 mJ is generated at similar to 7 mu m for a repetition rate of 100 Hz. Tuning of the mid-IR radiation is demonstrated by heating of the Rb: PPKTP crystal.
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| 21. |
- Boyko, Andrey A., et al.
(författare)
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Intracavity-pumped, cascaded AgGaSe2 optical parametric oscillator tunable from 5.8 to 18 mu m
- 2015
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Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 23:26, s. 33460-33465
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Tidskriftsartikel (refereegranskat)abstract
- A AgGaSe2 nonlinear crystal placed in a coupled cavity is intracavity pumped by the similar to 1.85-mu m signal pulses of a 1.064-mu m pumped Rb: PPKTP doubly-resonant optical parametric oscillator (OPO) operating at a repetition rate of 100 Hz. Using two samples cut for type-I and II phase-matching, the overall idler tunability of the singly-resonant AgGeSe2 OPO covers an unprecedented spectral range from 5.8 to similar to 18 mu m in the mid-IR.
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| 23. |
- Boyko, Andrey A., et al.
(författare)
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Optical parametric oscillator pumped at similar to 1 mu m with intracavity mid-IR difference-frequency generation in OPGaAs
- 2018
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Ingår i: Optical Materials Express. - : Optical Society of America. - 2159-3930 .- 2159-3930. ; 8:3, s. 549-554
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Tidskriftsartikel (refereegranskat)abstract
- Intracavity difference-frequency generation (DFG) between signal and idler pulses is investigated in orientation-patterned GaAs inside the cavity of a similar to 1 mu m pumped nanosecond optical parametric oscillator (OPO). Using two different samples and temperature tuning in the non-critical configuration, tunability between 7 and 9.2 mu m is demonstrated. The superior thermo-mechanical properties of OPGaAs enabled also for the first time operation of this cascaded scheme at kilohertz (1-3 kHz) repetition rates reaching average powers similar to 10 mW in the mid-IR.
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| 24. |
- Boyko, Andrey A., et al.
(författare)
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Rb:PPKTP optical parametric oscillator with intracavity difference-frequency generation in AgGaSe2
- 2016
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Ingår i: Optics Letters. - : Optical Society of America. - 0146-9592 .- 1539-4794. ; 41:12, s. 2791-2794
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Tidskriftsartikel (refereegranskat)abstract
- A 1.064 mu m pumped Rb:PPKTP optical parametric oscillator (OPO) generates mid-IR radiation by intracavity mixing the resonant signal and idler waves in AgGaSe2. The similar to 6 ns pulses at similar to 7 mu m have an energy of 670 mu J at 100 Hz, equivalent to an average power of 67 mW. The overall quantum conversion efficiency from 1.064 mu m amounts to 8%, and the power conversion efficiency is 1.2%.
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| 25. |
- Boyko, A., et al.
(författare)
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Intracavity-pumped, cascaded optical parametric oscillator based on BaGa2GeSe6
- 2018
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Ingår i: Optics InfoBase Conference Papers. - : Optics Info Base, Optical Society of America. - 9781557528209
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Konferensbidrag (refereegranskat)abstract
- We employ the new chalcogenide crystal BaGa2GeSe6 for the first time for frequency down-conversion into the mid-IR, in an optical parametric oscillator (OPO), intracavity pumped by the signal wave of a 1.064-μm pumped Rb:PPKTP OPO. .
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