| 1. |
- 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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| 2. |
- 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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| 3. |
- 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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| 4. |
- Campbell, S., et al.
(författare)
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Frequency-doubling in femtosecond laser inscribed periodically-poled potassium titanyl phosphate waveguides
- 2007
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Ingår i: Optics Express. - 1094-4087. ; 15:25, s. 17146-17150
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Tidskriftsartikel (refereegranskat)abstract
- Frequency doubling has been achieved in femtosecond-laser-inscribed single-mode waveguides written in two periodically-poled potassium titanyl phosphate crystals. A conversion efficiency of 0.22 %W-1 was obtained for first-order quasi-phase matching at 980 nm and an efficiency of 0.02 %W-1 for third-order quasi-phase matching at 800 nm.
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| 5. |
- Chen, Weidong, et al.
(författare)
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Narrowband, intracavity-pumped, type-II BaGa2GeSe6 optical parametric oscillator
- 2024
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Ingår i: Optics Express. - : Optica Publishing Group. - 1094-4087. ; 31:2, s. 1728-1735
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Tidskriftsartikel (refereegranskat)abstract
- We present a tunable (6.62-11.34 µm), singly-resonant, cascade optical parametric oscillator with intracavity pumping of BaGa2GeSe6 in the second stage and spectral narrowing realized by a Volume Bragg Grating acting on the signal wave of the first stage which serves as a pump for the second stage. The maximum energy achieved near 8 µm in the narrowband regime is 1.1 mJ at 100 Hz (spectral width: ∼20 cm−1, pulse duration: ∼7 ns). The overall conversion efficiency from 1 to 8 µm for broadband and narrowband operation is 4.0% and 3.1%, respectively, corresponding to quantum efficiencies of 31% and 23%.
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| 6. |
- Fragemann, Anna, et al.
(författare)
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High-peak power nanosecond optical parametric amplifier with periodically poled KTP
- 2003
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Ingår i: Optics Express. - 1094-4087. ; 11:11, s. 1297-1302
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Tidskriftsartikel (refereegranskat)abstract
- A two-stage optical parametric amplifier generating 5 ns 208 kW peak power pulses in the spectral region at 1.535 mum in a diffraction-limited beam was realized in a single periodically poled KTP crystal. The maximum small-signal gain for the two stages reached 75dB and the total conversion efficiency was 30%. An analysis of the small-signal gain dependence on the M-2 of the pump beam is presented for the collinear and noncollinear OPA. Efficient spectral broadening of the signal was demonstrated in short pieces of single-mode telecommunication fiber.
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| 7. |
- Fragemann, Anna, et al.
(författare)
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Optical parametric amplification of a gain-switched picosecond laser diode
- 2005
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Ingår i: Optics Express. - 1094-4087. ; 13:17, s. 6482-6489
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Tidskriftsartikel (refereegranskat)abstract
- Optical parametric amplification, employing periodically poled KTiOPO4 as the gain medium, was used to amplify radiation emitted by a gain-switched laser diode. The pulses, which had durations between 20 ps and 2 ns, were amplified with up to 50 dB in a double stage set-up and reached pulse energies of 1 and 23 mu J, respectively.
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| 8. |
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| 9. |
- Hamperl, Jonas, et al.
(författare)
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Range-resolved detection of boundary layer stable water vapor isotopologues using a ground-based 1.98 mu m differential absorption LIDAR
- 2022
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Ingår i: Optics Express. - : Optica Publishing Group. - 1094-4087. ; 30:26, s. 47199-47215
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a first demonstration of range-resolved differential absorption LIDAR (DIAL) measurements of the water vapor main isotopologue H216O and the less abundant semi-heavy water isotopologue HD16O with the aim of determining the isotopic ratio. The presented Water Vapor and Isotope Lidar (WaVIL) instrument is based on a parametric laser source emitting nanosecond pulses at 1.98 mu m and a direct-detection receiver utilizing a commercial InGaAs PIN photodiode. Vertical profiles of H216O and HD16O were acquired in the planetary boundary layer in the suburban Paris region up to a range of 1.5 km. For time averaging over 25 min, the achieved precision in the retrieved water vapor mixing ratio is 0.1 g kg-1 (2.5% relative error) at 0.4 km above ground level (a.g.l.) and 0.6 g kg-1 (20%) at 1 km a.g.l. for 150 m range bins along the LIDAR line of sight. For HD16O, weaker absorption has to be balanced with coarser vertical resolution (600 m range bins) in order to achieve similar relative precision. From the DIAL measurements of H216O and HD16O, the isotopic abundance delta D was estimated as -51%0 at 0.4 km above the ground and -119%0 in the upper part of the boundary layer at 1.3 km a.g.l. Random and systematic errors are discussed in the form of an error budget, which shows that further instrumental improvements are required on the challenging path towards DIAL-profiling of the isotopic abundance with range resolution and precision suitable for water cycle studies.
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| 10. |
- Hellström, Jonas E., et al.
(författare)
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Quasi-two-level Yb:KYW laser with a volume Bragg grating
- 2007
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Ingår i: Optics Express. - 1094-4087. ; 15:21, s. 13930-13935
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Tidskriftsartikel (refereegranskat)abstract
- Using a volume Bragg grating as input coupler, we demonstrate an Yb:KYW laser with a very small quantum defect (1.6%) and an output power of 3.6 W. The laser was longitudinally diode-pumped at 982 nm and the laser wavelength was determined by the grating to 998 nm, with a laser bandwidth of 10 GHz (33 pm). Due to the low quantum defect, the laser should be readily scalable to 20 W or more without critical thermal effects.
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