| 1. |
- Balcou, P, et al.
(författare)
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Quantum-path analysis and phase matching of high-order harmonic generation and high-order frequency mixing processes in strong laser fields
- 1999
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Ingår i: Journal of Physics B: Atomic, Molecular and Optical Physics. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 32:12, s. 2973-2989
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Tidskriftsartikel (refereegranskat)abstract
- We study phase-matching conditions for high-order harmonic generation as well as high-order sum- and difference-frequency mixing processes in strong laser fields, using a graphical approach described in Balcou et al (1997 Phys. Rev. A 55 3204-10). This method is based on the analysis of the different quantum paths that contribute, with different phase properties, to the single-atom response. We propose a simple numerical method to disentangle the quantum paths contributing to the generation process. We present graphical maps of the phase matching around the laser focus, which allow one to predict the geometries that optimize the conversion efficiency of the process considered. The method is applied to the study of sum- and difference-frequency mixing processes. The qualitative predictions of the graphical phase-matching approach are confirmed by numerical propagation calculations.
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| 2. |
- Bränning, Camilla, et al.
(författare)
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Counterworking Male Takeover during Class Room Activities in Superior Technical Education
- 2005
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Ingår i: [Host publication title missing].
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Konferensbidrag (refereegranskat)abstract
- An increase in student activity is the goal of various pedagogic approaches and highly valued in most teaching situations. The benefits of student activation are widely discussed in literature (Fox, 1983), but possible drawbacks of such techniques need to be identified and compensations need to be found. This paper discusses a case study concerning one particular course moment, a seminar, held over a two-year period in a program with a strong underrepresentation of female students. The study shows how changes in the pedagogic approach can lead to an increased student activity, although accompanied by a total male takeover of the class room activity. It seems like traditional social structures tend to take over the class room activities, determining the roles that different gender groups may play (Parker, 1996; Olevard, 1997). At the same time, seminars are an important factor in the socialization of students, affecting the following cultural and structural development in the academia. “Hence, besides the content of the course, students attending seminars learn social structures as well, determining who may or may not speak” (Gunnarsson, 1995). The tools presented in this paper are applicable in any LTH classroom and also in future work places. To counterwork male takeover, without suppressing the overall student activity, is the topic of this paper. Different pedagogic measures are analyzed in this context and discussed in the paper.
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