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Concepts for compact solid-state lasers in the visible and UV
KTH, School of Engineering Sciences (SCI), Physics.
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In many fields, scientific or industrial, optical devices that can be tailored in terms of spectral qualities and output power depending on the application in question are attractive. Nonlinear optics in combination with powerful laser sources provide a tool to achieve essentially any wavelength in the electromagnetic spectrum, and the advancement of material technology during the last decade has opened up new possibilities in terms of realising such devices.

The main part of the thesis deals with the development of compact functional lasers based on nonlinear interaction utilising diode-pumped solid-state lasers and also laser diodes. Efficient frequency conversion into the visible and ultraviolet part of the electromagnetic spectrum has been achieved, using both Nd:YAG and Nd:YVO4 lasers as well as a semiconductor laser as the fundamental light sources. For the nonlinear conversion, periodically poled potassium titanyl phosphate (PPKTP), bismuth triborate (BiBO) and beta barium borate (BBO) have been employed.

In the search for compact and reliable light sources emitting in the visible part of the spectrum, two different approaches have been explored. First, a scheme based on sum-frequency mixing of a diode-pumped solid-state laser and a laser diode of good beam quality. The idea of this approach is to take advantage of the individual strength of each device, which would be the flexibility in terms of wavelength for the laser diode and the possibility to reach high output power from the diode-pumped solid-state laser. Second, by mixing two different solid-state lasers substantially more output power could be generated albeit at a cost of less freedom in the choice of spectral output. As these two light sources had their central wavelength at 492 nm and 593 nm, respectively, they are highly interesting in biomedical applications since they correspond to the peak absorption of several popular fluorophores.

In applications such as lithography, material synthesis and fibre grating fabrication, laser sources emitting in the deep-UV spectrum are desired. An all solid-state 236 nm laser source with 20 mW of average power have been designed and constructed, by frequency-quadrupling a passively Q-switched Nd:YAG laser lasing on a quasi-three level transition.

Also, a novel concept for miniaturising solid-state lasers has been examined. Using a heat-conductive polymer carrier, a generic approach especially suited for mass-production of functional laser devices is presented.

Finally, it has been proven that GRIN lenses can provide a very compact beam shaping solution to standard laser diodes based on the beam twisting approach. This method offers several advantages such as compactness of the beam shaping system, automated assembly in solid-state laser manufacturing due to the shape of these lenses and polarisation preservation of the laser diode output.

Place, publisher, year, edition, pages
Stockholm: KTH , 2006. , xiii, 76 p.
Series
Trita-FYS, ISSN 0280-316X ; 2006:72
Keyword [en]
nonlinear optics, frequency conversion, visible lasers, ultraviolet lasers, KTiOPO4, BiBO, BBO, quasi phase-matching, birefringent phase-matching, solid-state lasers
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-4223ISBN: 978-91-7178-539-8 (print)OAI: oai:DiVA.org:kth-4223DiVA: diva2:11318
Public defence
2006-12-15, FB55, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100903Available from: 2006-12-11 Created: 2006-12-11 Last updated: 2015-03-30Bibliographically approved
List of papers
1. Generation of turquoise light by sum-frequency mixing of a diode-pumped solid-state laser and a laser diode in periodically poled PPKTP
Open this publication in new window or tab >>Generation of turquoise light by sum-frequency mixing of a diode-pumped solid-state laser and a laser diode in periodically poled PPKTP
2004 (English)In: Optics expresss, ISSN 1094-4087, Vol. 12, 4935-4940 p.Article in journal (Refereed) Published
Abstract [en]

We report a simple and efficient method to achieve visible light by sum-frequency mixing radiation from a diode-pumped solid-state laser and a laser diode in a periodically poled KTiOPO4 crystal. Since high-power laser diodes are available at a wide range of wavelengths, it is thereby possible to obtain essentially any wavelength in the visible spectrum by appropriate choice of lasers. For demonstration we choose to construct a light source in the blue-green region. A turquoise output power of 4.0 mW was achieved.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-6565 (URN)10.1364/OPEX.12.004935 (DOI)000224253900031 ()2-s2.0-9144272417 (Scopus ID)
Note
QC 20100903 QC 20110923Available from: 2006-12-11 Created: 2006-12-11 Last updated: 2015-03-30Bibliographically approved
2. Compact 492-nm light source based on sum-frequency mixing
Open this publication in new window or tab >>Compact 492-nm light source based on sum-frequency mixing
2005 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 13, no 7, 2590-2595 p.Article in journal (Refereed) Published
Abstract [en]

More than 27 mW of 492-nm power was generated in a compact design, using intra-cavity sum frequency mixing of a laser diode and a diode-pumped solid-state laser in a periodically-poled KTiOPO4 crystal.

Keyword
periodically poled ktp, blue-light, laser-diode, doubled nd, generation, cavity, yag, radiation, crystal, ktiopo4
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-6566 (URN)10.1364/OPEX.13.002590 (DOI)000228180800037 ()2-s2.0-21244463931 (Scopus ID)
Note
QC 20100903Available from: 2006-12-11 Created: 2006-12-11 Last updated: 2017-12-14Bibliographically approved
3. Efficient all solid-state continuous-wave yellow-orange light source
Open this publication in new window or tab >>Efficient all solid-state continuous-wave yellow-orange light source
Show others...
2005 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 13, 1188-1192 p.Article in journal (Refereed) Published
Abstract [en]

We present highly efficient sum-frequency generation between two CWIR lasers using periodically poled KTP. The system is based on the 1064 and 1342 nm laser-lines of two Nd:YVO4 lasers. This is an all solid-state light source in the yellow-orange spectral range. The system is optimized in terms of efficiency as well as stability. We compare the performance of a singly and a doubly resonant system, and find that the stability of the singly resonant system is superior to that of the doubly resonant system. We find that the overall conversion efficiency of the single resonant system is higher than for the doubly resonant configuration.

Keyword
Biomedical engineering, Dye lasers, Infrared radiation, Neodymium lasers, Nonlinear optics, Pumping (laser), Quantum well lasers, Resonance
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-6567 (URN)10.1364/OPEX.13.001188 (DOI)000227252700019 ()2-s2.0-14744296702 (Scopus ID)
Note
QC 20100903Available from: 2006-12-11 Created: 2006-12-11 Last updated: 2017-12-14Bibliographically approved
4. Polymer encapsulated miniature Nd:YAG lasers
Open this publication in new window or tab >>Polymer encapsulated miniature Nd:YAG lasers
Show others...
2003 (English)In: Electronics Letters, ISSN 0013-5194, E-ISSN 1350-911X, Vol. 39, no 20, 1446-1448 p.Article in journal (Refereed) Published
Abstract [en]

A continuation of the previously introduced microstructured silicon carrier concept for diode-pumped solid-state lasers is presented, using novel heat-conducting polymers as a carrier. The most prominent features of the silicon carrier concept are maintained, adding to the mass production possibilities of the inexpensive polymers. The first experiments, using a continuous wave Nd:YAG microchip laser, have given an output power of 2 W at 1064 nm, showing the potential of this new approach.

Keyword
Conductive plastics, Encapsulation, Heat conduction, Microstructure, Microchip lasers, Neodymium lasers
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-8891 (URN)10.1049/el:20030924 (DOI)000186031500014 ()
Note
QC 20100901Available from: 2005-12-08 Created: 2005-12-08 Last updated: 2017-12-14Bibliographically approved
5. Laser diode beam shaping with GRIN lenses using the twisted beam approach and its application in pumping of a solid-state laser
Open this publication in new window or tab >>Laser diode beam shaping with GRIN lenses using the twisted beam approach and its application in pumping of a solid-state laser
Show others...
2007 (English)In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 274, no 2, 403-406 p.Article in journal (Refereed) Published
Abstract [en]

We report a novel beam shaping method for laser diodes based on the concept of twisted Gaussian Schell-model beams using GRIN lenses. This method enables a more symmetric pump as well as a compact setup for pumping of solid-state lasers. In the experiment with a standard 2 W diode, the beam quality factors in the two orthogonal directions were equalized to M-x(2) approximate to 24 and M-y(2) approximate to 18, respectively, which pumped an intra-cavity frequency-doubled Nd:YAG laser at 946 run with an output of 28 mW at 473 nm.

Keyword
orbital angular-momentum, hermite-gaussian-beams, schell-model beams, transformation
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-6569 (URN)10.1016/j.optcom.2007.02.055 (DOI)000246541600021 ()2-s2.0-34247280444 (Scopus ID)
Note
Tidigare titel: Solid-state laser pumped by twisted beam shaped laser diode Uppdaterad till från submitted till published: 20100903 QC 20100903Available from: 2006-12-11 Created: 2006-12-11 Last updated: 2017-12-14Bibliographically approved
6. An all solid-state UV source based on a frequency-quadrupled, passively Q-switched 946 nm laser
Open this publication in new window or tab >>An all solid-state UV source based on a frequency-quadrupled, passively Q-switched 946 nm laser
Show others...
2007 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 15, no 2, 449- p.Article in journal (Refereed) Published
Abstract [en]

We report a 236 nm light source with 20 mW of average power based on critically phase-matched second-harmonic generation in a beta-barium borate crystal at room temperature. The fundamental light source was a passively Q-switched 946 nm Nd: YAG laser tunable from 10-38 kHz and with a pulse length of 16 ns. In the generation of 473 nm light, periodically poled KTP and BiBO was compared in terms of conversion efficiency and stability.

Keyword
periodically poled ktiopo4, nd-yag laser, generation, system, ktp
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-6570 (URN)10.1364/OE.15.000449 (DOI)000244680600022 ()2-s2.0-33846484931 (Scopus ID)
Note
Uppdaterad från submitted till published: 20100903 QC 20100903Available from: 2006-12-11 Created: 2006-12-11 Last updated: 2017-12-14Bibliographically approved

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