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Optical parametric amplification with periodically poled KTiOPO4
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis explores the use of engineered nonlinear crystals from the KTiOPO4 (KTP) family as the gain material in optical parametric amplifiers (OPAs), with the aim to achieve more knowledge about the benefits and limitations of these devices. The work aims further at extending the possible applications of OPAs by constructing and investigating several efficient and well performing amplifiers.

An OPA consists of a strong pump source, which transfers its energy to a weak seed beam while propagating through a nonlinear crystal. The crystals employed in this work are members of the KTP family, which are attractive due to their large nonlinear coefficients, high resistance to damage and wide transparency range. The flexibility of OPAs with respect to different wavelength regions and pulse regimes was examined by employing various dissimilar seed and pump sources.

The possibility to adapt an OPA to a specific pump and seed wavelength and achieve efficient energy conversion between the beams, originates from quasi-phasematching, which is achieved in periodically poled (PP) nonlinear crystals. Quasi-phasematched samples can be obtained by changing the position of certain atoms in a ferroelectric crystal and thereby reversing the spontaneous polarisation.

In this thesis several material properties of PP crystals from the KTP family were examined. The wavelength and temperature dispersion of the refractive index were determined for PP RbTiOPO4, which is essential for future use of this material. Another experiment helped to increase the insight into the volumes close to domain walls in PP crystals

Further, several OPAs were built and their ability to efficiently amplify the seed beam without changing its spectral or spatial properties was studied. Small signal gains of up to 55 dB and conversion efficiencies of more than 35 % were achieved for single pass arrangements employing 8 mm long PPKTP crystals. Apart from constructing three setups, which generated powerful nanosecond, picosecond and femtosecond pulses, the possibility to amplify broadband signals was investigated. An increase of the OPA bandwidth by a factor of approximately three was achieved in a noncollinear configuration.

Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , x, 75 p.
Series
Trita-FYS, ISSN 0280-316X ; 2005:62
Keyword [en]
nonlinear optics, optical parametric amplification, optical parametric generation, optical parametric oscillation
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-531ISBN: 91-7178-201-X (print)OAI: oai:DiVA.org:kth-531DiVA: diva2:14320
Public defence
2005-12-09, Sal FD5, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:15
Opponent
Supervisors
Note
QC 20101013Available from: 2005-12-02 Created: 2005-12-02 Last updated: 2010-10-13Bibliographically approved
List of papers
1. Broadband nondegenerate optical parametric amplification in the mid infrared with periodically poled KTiOPO4
Open this publication in new window or tab >>Broadband nondegenerate optical parametric amplification in the mid infrared with periodically poled KTiOPO4
2005 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 30, no 17, 2296-2298 p.Article in journal (Refereed) Published
Abstract [en]

We theoretically and experimentally demonstrate that the bandwidth in a nondegenerate optical parametric amplifier can be substantially increased by noncollinear interaction in a quasi-phase-matched single-periodicity structure. Broadband amplification of signals between 1540 and 1720 nm was realized in periodically poled KTiOPO4. The achieved signal bandwidth of 6.9 THz at 1680 nm is large enough to accommodate sub-100 fs optical pulses.

Keyword
Bandwidth, Infrared radiation, Light amplifiers, Parametric amplifiers, Signal processing, Noncolinear interaction, Optical pulses, Periodicity structures
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-8848 (URN)10.1364/OL.30.002296 (DOI)000231436900036 ()2-s2.0-25144525210 (Scopus ID)
Note
QC 20101013Available from: 2005-12-02 Created: 2005-12-02 Last updated: 2015-03-30Bibliographically approved
2. Optical parametric amplification of a gain-switched picosecond laser diode
Open this publication in new window or tab >>Optical parametric amplification of a gain-switched picosecond laser diode
2005 (English)In: Optics Express, ISSN 1094-4087, Vol. 13, no 17, 6482-6489 p.Article in journal (Refereed) Published
Abstract [en]

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.

Keyword
Laser optics, Laser pulses, Parametric amplifiers, Switching, Double stage set-up, Gain switched picosecond laser diode, Optical parametric amplification, Pulse energies
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-8849 (URN)10.1364/OPEX.13.006482 (DOI)000231375000019 ()2-s2.0-24144487435 (Scopus ID)
Note
QC 20101013. Uppdaterad från accepted till published (20101013).Available from: 2005-12-02 Created: 2005-12-02 Last updated: 2015-03-30Bibliographically approved
3. High-peak power nanosecond optical parametric amplifier with periodically poled KTP
Open this publication in new window or tab >>High-peak power nanosecond optical parametric amplifier with periodically poled KTP
2003 (English)In: Optics Express, ISSN 1094-4087, Vol. 11, no 11, 1297-1302 p.Article in journal (Refereed) Published
Abstract [en]

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.

Keyword
Crystal structure, Four wave mixing, Gain control, Noise abatement, Nonlinear optics, Optical cables, Optical radar, Parametric amplifiers, Raman scattering, Semiconductor lasers, Signal processing, Tissue, Parametric processes, Phase matching, Seed energy, Signal propagation, Single-mode telecommunication fiber
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-8850 (URN)10.1364/OE.11.001297 (DOI)000183248900007 ()
Note
QC 20101013Available from: 2005-12-02 Created: 2005-12-02 Last updated: 2015-03-30Bibliographically approved
4. Second-order nonlinearities in the domain walls of periodically poled KTiOPO4
Open this publication in new window or tab >>Second-order nonlinearities in the domain walls of periodically poled KTiOPO4
2004 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 85, no 3, 375-377 p.Article in journal (Refereed) Published
Abstract [en]

The domain wall regions in periodically poled KTiOPO4 crystals were examined and found to give rise to phasematched second harmonic generation in the Cerenkov directions. This phenomenon is caused by the nonlinear coefficients d(11) and d(12), which are not present in single domain regions, but are nonzero at and close to domain walls. The appearance of these nonlinearities is attributed to strain, produced by the domain inversion process and results in the creation of a dc piezoelectric field.

Keyword
Ferroelectricity, Laser beams, Optical waveguides, Q switched lasers, Refractive index, Second harmonic generation, Transmission electron microscopy, X ray diffraction, Electric field poling, Electrostatic energy, Ferroelectric domain, Spatial coherence
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-23575 (URN)10.1063/1.1775031 (DOI)000222680400009 ()2-s2.0-4043119651 (Scopus ID)
Note
QC 20100525 QC 20110926Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved
5. Frequency converters from visible to mid-infrared with periodically poled RbTiOPO4
Open this publication in new window or tab >>Frequency converters from visible to mid-infrared with periodically poled RbTiOPO4
Show others...
2003 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 83, no 15, 3090-3092 p.Article in journal (Refereed) Published
Abstract [en]

Electric-field poling has been used to fabricate quasi-phase-matched frequency converters in RbTiOPO4. A more accurate Sellmeier equation has been obtained for wavelengths between 0.43 and 3.4 mum. The dispersion of the thermo-optic coefficient for n(z) refractive index has been derived in the near- to mid-infrared spectral region. The nonlinear performance of periodically poled RbTiOPO4 obtained in the infrared optical parametric devices is comparable to that of periodically poled KTiOPO4.

Keyword
Bandwidth, Birefringence, Electric fields, Frequency converters, Refractive index, Thermo-optic coefficients
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-8852 (URN)10.1063/1.1619211 (DOI)000185832400034 ()
Note
QC 20101013Available from: 2005-12-02 Created: 2005-12-02 Last updated: 2015-03-30Bibliographically approved
6. Efficient all-diode-pumped double stage femtosecond optical parametric chirped pulse amplification at 1-kHz with periodically poled KTiOPO4
Open this publication in new window or tab >>Efficient all-diode-pumped double stage femtosecond optical parametric chirped pulse amplification at 1-kHz with periodically poled KTiOPO4
Show others...
2003 (English)In: Japanese Journal of Applied Physics, ISSN 0021-4922, E-ISSN 1347-4065, Vol. 42, no 11A, L1327-L1329 p.Article in journal (Refereed) Published
Abstract [en]

A practical efficient optical parametric chirped pulse amplification is demonstrated with periodically poled KTiOPO4. It provides a compact solution to amplify stretched pulses to the 100 muJ level (signal + idler) at 1 kHz. The amplified signal pulses near 1.57 mum are recompressed to 270 fs.

Keyword
femtosecond pulses, chirped pulses, optical parametric amplification, pulse compression, periodically poled KTP, generation
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-22998 (URN)10.1143/jjap.42.l1327 (DOI)000186948200012 ()
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved
7. Enhanced stimulated Raman scattering in optical parametric oscillators from periodically poled KTiOPO4
Open this publication in new window or tab >>Enhanced stimulated Raman scattering in optical parametric oscillators from periodically poled KTiOPO4
Show others...
2003 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 82, no 3, 325-327 p.Article in journal (Refereed) Published
Abstract [en]

Enhanced Raman scattering and concurrent Raman oscillation have been observed in nanosecond optical parametric oscillators in the near-infrared spectral region for certain periodicities of periodically poled KTiOPO4. The increased Raman activity is associated with direct excitation of the phonon overtone band by the idler wave. The decrease in efficiency of stimulated Raman scattering at crystal temperature above 80 degreesC is explained by higher dephasing rate of coherently driven lattice polarization due to interaction with thermally generated phonons.

Keyword
Crystal lattices, Light polarization, Oscillations, Phonons, Potassium compounds, Raman scattering, Optical parametric oscillators
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-8854 (URN)10.1063/1.1539923 (DOI)000180449100005 ()
Note
QC 20101013Available from: 2005-12-02 Created: 2005-12-02 Last updated: 2015-03-30Bibliographically approved

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