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Laser diode beam shaping with GRIN lenses using the twisted beam approach and its application in pumping of a solid-state laser
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.ORCID iD: 0000-0002-2508-391X
KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.ORCID iD: 0000-0001-7688-1367
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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.

Place, publisher, year, edition, pages
2007. Vol. 274, no 2, 403-406 p.
Keyword [en]
orbital angular-momentum, hermite-gaussian-beams, schell-model beams, transformation
National Category
Other Physics Topics
URN: urn:nbn:se:kth:diva-6569DOI: 10.1016/j.optcom.2007.02.055ISI: 000246541600021ScopusID: 2-s2.0-34247280444OAI: diva2:11316
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: 2015-03-30Bibliographically approved
In thesis
1. Concepts for compact solid-state lasers in the visible and UV
Open this publication in new window or tab >>Concepts for compact solid-state lasers in the visible and UV
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.
Trita-FYS, ISSN 0280-316X ; 2006:72
nonlinear optics, frequency conversion, visible lasers, ultraviolet lasers, KTiOPO4, BiBO, BBO, quasi phase-matching, birefringent phase-matching, solid-state lasers
National Category
Physical Sciences
urn:nbn:se:kth:diva-4223 (URN)978-91-7178-539-8 (ISBN)
Public defence
2006-12-15, FB55, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00 (English)
QC 20100903Available from: 2006-12-11 Created: 2006-12-11 Last updated: 2015-03-30Bibliographically approved

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