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Compact solid-state lasers in the near-infrard and visible spectral range
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The subject of this thesis is the exploration of new concepts for compact solid-state lasers in the visible and near-infrared spectral range using new components such as volume Bragg gratings for wavelength stabilisation and wavelength tuning. Also single-walled carbon nanotubes for mode-locking and Q-switching of lasers have been studied.We have developed a new method for the tuning of solid-state lasers by replacing a dielectric mirror with a transversally chirped volume Bragg grating, which allows smooth wavelength tuning without additional elements inside the laser cavity. The result is a more compact laser, since the tuning mechanism and output coupler are incorporated in one component. Another benefit is an increased efficiency, since additional elements inside the cavity will always add to the total loss of the laser. This has been demonstrated for a broadband ytterbium laser around 1 µm and a single-longitudinal-mode Nd:YVO4 laser around 1.06 µm. A volume Bragg grating has also been used to construct an efficient, narrow-linewidth ytterbium fiber laser and the employment of a volume Bragg gratingas the pump mirror of a solid-state laser for frequency-doubling has been investigated. Both lasers represent a practical solution, eliminating the use of additional intracavity elements.

Second-harmonic generation is an efficient way to access the visible spectral range using diode-pumped solid-state lasers. However, these lasers can suffer from large amplitude fluctuations, which has been analyzed in more detail for an optically-pumped semiconductor disk-laser and a volume Bragg grating locked ytterbiumlaser. The control of those amplitude fluctuations is very important, since many applications like fluorescence microscopy require a laser with a constant output power and as little noise as possible.

In addition to this, we have demonstrated, that saturable absorbers based on quan-tum dots and carbon nanotubes can be used to mode-lock compact laser at a wavelength around 1.03 µm. Those lasers have many interesting applications incommunications, clock generation, metrology and life sciences.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. , xii, 78, xi p.
Series
Trita-FYS, ISSN 0280-316X ; 2013:13
Keyword [en]
volume Bragg gratings, single-longitudinal-mode laser, laser tuning, Q-switching, mode-locking, carbon nanotubes, semiconductor lasers, neodymium, ytterbium, nonlinear optics, KTP
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-121976ISBN: 978-91-7501-764-8 (print)OAI: oai:DiVA.org:kth-121976DiVA: diva2:619905
Public defence
2013-05-30, FD5, Albanova, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20130507

Available from: 2013-05-07 Created: 2013-05-07 Last updated: 2015-03-30Bibliographically approved
List of papers
1. Tunable Yb:KYW laser using a transversely chirped volume Bragg grating
Open this publication in new window or tab >>Tunable Yb:KYW laser using a transversely chirped volume Bragg grating
2009 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 17, no 4, 2341-2347 p.Article in journal (Refereed) Published
Abstract [en]

We demonstrate a diode-pumped Yb:KYW laser, where the wavelength is controlled by a transversely chirped volume-Bragg-grating, also used as the laser output coupler. By translating the grating, the wavelength could be tuned from 997 nm to 1016 nm, with a spectral bandwidth of 13 GHz and a power up to 3.3 W. The laser cavity is simple and compact, and the tuning method is generally applicable to many other laser systems.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-32660 (URN)10.1364/OE.17.002341 (DOI)000263432500028 ()2-s2.0-60549097527 (Scopus ID)
Note
QC 20110418Available from: 2011-04-18 Created: 2011-04-18 Last updated: 2017-12-11Bibliographically approved
2. Tunable, passively Q-switched single-longitudinal-mode Nd:YVO4 laser using a chirped volume Bragg grating
Open this publication in new window or tab >>Tunable, passively Q-switched single-longitudinal-mode Nd:YVO4 laser using a chirped volume Bragg grating
Show others...
2012 (English)In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 109, no 1, 99-103 p.Article in journal (Refereed) Published
Abstract [en]

A Nd:YVO4 laser was locked with a chirped volume Bragg grating to achieve single-longitudinal-mode output. Tuning was performed from 1,063 to 1,065 nm by translating the grating and a maximum output power of 4 W was obtained. With a Cr 4+:YAG saturable absorber, Q-switched pulses with 4 ns and a pulse energy of 5.7 lJ were achieved which could be frequency doubled in PPKTP with a conversion efficiency exceeding 50 %.

Keyword
Maximum output power, Nd:YVO4 laser, Passively Q-switched, Pulse energies, Q-switched pulse, Single longitudinal mode, Volume Bragg gratings
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-106957 (URN)10.1007/s00340-012-5127-1 (DOI)000310743700015 ()2-s2.0-84868582756 (Scopus ID)
Funder
Swedish Research Council
Note

QC 20121205

Available from: 2012-12-05 Created: 2012-12-05 Last updated: 2017-12-07Bibliographically approved
3. Highly efficient temporally stable narrow linewidth cryogenically cooled Yb-fiber laser
Open this publication in new window or tab >>Highly efficient temporally stable narrow linewidth cryogenically cooled Yb-fiber laser
2009 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 17, no 10, 8433-8438 p.Article in journal (Refereed) Published
Abstract [en]

Cryogenic cooling is an effective way of increasing the efficiency in many solid-state lasers. In fiber lasers however, while the efficiency is increased, a reduced reabsorption in combination with reduced homogeneous broadening tends to broaden the linewidth, yielding a low spectral power density of the laser emission. In this work we lock a cryogenically-cooled Yb-doped fiber laser with a volume Bragg grating to overcome this problem and achieve a temporally stable narrow linewidth highly efficient laser. We extract 11.4-W of output power in spectral window of less than 0.4-nm with 14.5-W of launched pump light.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-11709 (URN)10.1364/OE.17.008433 (DOI)000266381900075 ()2-s2.0-66449133549 (Scopus ID)
Note
QC 20100721Available from: 2009-12-07 Created: 2009-12-07 Last updated: 2017-12-12Bibliographically approved
4. Gigahertz repetition rate mode-locked Yb:KYW laser using self-assembled quantum dot saturable absorber
Open this publication in new window or tab >>Gigahertz repetition rate mode-locked Yb:KYW laser using self-assembled quantum dot saturable absorber
Show others...
2013 (English)In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 110, no 3, 327-333 p.Article in journal (Refereed) Published
Abstract [en]

Fundamental mode-locking is achieved in a 1.036 GHz cavity using a semiconductor quantum dot saturable absorber mirror with a fast relaxation time component of down to 550 fs. The dispersive cavity delivers 1.7 ps wide pulses with spectra supporting sub-picosecond pulse durations and an MA(2) of 1.3. An average output power of up to 339 mW at wavelengths around 1,032 nm is achieved and the saturable absorber's damage threshold is identified as a limitation for further power scaling.

Keyword
Power, Ghz, Microscopy, Locking
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-120538 (URN)10.1007/s00340-013-5375-8 (DOI)000316198700009 ()2-s2.0-8489142439 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme, 224668Swedish Research Council
Note

QC 20130411

Available from: 2013-04-11 Created: 2013-04-11 Last updated: 2017-12-06Bibliographically approved
5. Experimental study of the output dynamics of intracavity frequency doubled optically pumped semiconductor disk lasers
Open this publication in new window or tab >>Experimental study of the output dynamics of intracavity frequency doubled optically pumped semiconductor disk lasers
Show others...
2008 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 92, no 10Article in journal (Refereed) Published
Abstract [en]

The dynamic behavior of the continuous wave output of an intracavity frequency doubled optically pumped semiconductor disk laser is described. These lasers typically exhibit stable emission. The reasons are found to be the tendency to single-mode operation and the high gain coupling of different modes due to an extremely short gain medium and the resonant periodic gain structure. A dependence of the fluctuation amplitude on gain decoupling of different fundamental modes is demonstrated. With the presented laser setup, more than 80% of conversion efficiency with respect to the available fundamental power has been achieved.

Place, publisher, year, edition, pages
American Institute of Physics, 2008
Keyword
Semiconductor Lasers, harmonic generation, nonlinear dynamics
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-109445 (URN)10.1063/1.2895642 (DOI)000253989300007 ()
Note

QC 20130507

Available from: 2013-01-03 Created: 2013-01-03 Last updated: 2017-12-06Bibliographically approved
6. Carbon nanotube mode-locked optically-pumped semiconductor disk laser
Open this publication in new window or tab >>Carbon nanotube mode-locked optically-pumped semiconductor disk laser
Show others...
2013 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, no 15, 17806-17813 p.Article in journal (Refereed) Published
Abstract [en]

An optically pumped semiconductor disk laser was mode-locked for the first time by employing a single-walled carbon nanotube saturable absorber. Stable passive fundamental mode-locking was obtained at a repetition rate of 613 MHz with a pulse length of 1.23 ps. The mode-locked semiconductor disk laser in a compact geometry delivered a maximum average output power of 136 mW at 1074 nm.

Keyword
Solid-State Lasers, Saturable Absorber, High-Power, Locking, Pulses
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-121987 (URN)10.1364/OE.21.017806 (DOI)000322366300042 ()2-s2.0-84880951935 (Scopus ID)
Funder
Swedish Research Council
Note

QC 20130930. Updated from submitted to published.

Available from: 2013-05-07 Created: 2013-05-07 Last updated: 2017-12-06Bibliographically approved
7. Intra-cavity frequency-doubled Yb: KYW laser using periodically poled Rb-doped KTP with a volume Bragg grating input coupler
Open this publication in new window or tab >>Intra-cavity frequency-doubled Yb: KYW laser using periodically poled Rb-doped KTP with a volume Bragg grating input coupler
Show others...
2014 (English)In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 115, no 2, 161-166 p.Article in journal (Refereed) Published
Abstract [en]

An Yb:KYW laser intra-cavity frequency doubled to the green at 514.7 nm using a periodically poled Rb:KTP crystal with an output power exceeding 1 W is presented. Spectral narrowing and locking at the fundamental wavelength has been achieved by using a volume Bragg grating as the input coupler.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2014
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-121986 (URN)10.1007/s00340-013-5587-y (DOI)000334493900003 ()2-s2.0-84899966004 (Scopus ID)
Funder
Swedish Research Council
Note

QC 20140516

Available from: 2013-05-07 Created: 2013-05-07 Last updated: 2017-12-06Bibliographically approved

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Output format
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