Automated birefringence dispersion measurements

Bajor, Andrzej L.; Piątkowski, T.; Lesniewski, Marcin

doi:10.1088/0957-0233/17/2/026

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…In in the natural birefringence was evidenced earlier in the conoscopic image [21]. In practical experiments, it was also confirmed that, e.g., the SH power not necessarily is small− est in the core (Fig.…”

Section: Assessment Of Gadolinium Calcium Oxoborate (Gdcobsupporting

confidence: 68%

Assessment of gadolinium calcium oxoborate (GdCOB) for laser applications

Bajor

Kisielewski

Kłos

et al. 2011

Opto-Electronics Review

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Increasing demand for growing high quality laser crystals puts a question about their most important parameters that one should concentrate on to get a desired product which will exhibit best properties in practical use. And by no means, this is a simple question. Apart of the usual lasing properties associated with a special dopant in the host material itself, one needs to consider another two lasing phenomena, namely second (SHG) and higher harmonic generation, and self-frequency doubling (SFD). Not necessarily all of these three can meet altogether in the same host material to yield in its best appearance in every case. We have made a review of basic properties of gadolinium oxoborate GdCa4O(BO3)3 (GdCOB) crystal and came to the conclusion that, currently, as a host material this is probably the best in all of its lasing applications. Although GdCOB has low thermal conductivity, which requires a suitable cooling, on the other hand it has got small thermo-optic coefficients which govern good operation in SHG and SFD experiments.Two inch dia. Nd-doped crystals were grown by the Czochralski technique. Since a large discrepancy in the literature exists on exact values of nonlinear coefficients, one is never sure about this whether theoretically predicted phase-matching angles (PMA) are those that are really optimal. Besides, none has yet measured the values of nonlinear coefficients as a function of doping concentration. Therefore we have not decided to cut numerous differently oriented samples for generation of different wavelengths in SHG and SFD, but rather tried to generate different wavelengths from the same samples. We have also not paid special attention to get highest possible conversion efficiencies. However, we have concentrated our attention on potential use of the core region in laser technique. Unlike in YAG crystals, when the core is by all means a parasitic structure, we discovered that the core region in GdCOB, that majority of investigators are even not aware of its presence in the crystal, can be also useful in laser technique. According to our best knowledge, a SHG of red light in this work is the second reported case in the world-wide literature.

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Section: Assessment Of Gadolinium Calcium Oxoborate (Gdcobsupporting

confidence: 68%

Assessment of gadolinium calcium oxoborate (GdCOB) for laser applications

Bajor

Kisielewski

Kłos

et al. 2011

Opto-Electronics Review

View full text Add to dashboard Cite

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“…However, when it comes to harmonic generation applications smaller dispersion in birefringence favours fair conversion efficiency. 40 The plot (Fig. 5b) depicts some distortions from the linearity curve, which may be due to the point defects in the specimen and is in tune with HRXRD analysis.…”

Section: Birefringence Analysismentioning

confidence: 82%

Key aspects ofl-threoninium picrate single crystal: an excellent organic nonlinear optical material with a high laser-induced damage threshold

et al. 2014

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“…Birefringence dispersion parameters were calculated from the spectropolarimetric measurements. This technique and adequate formulas have been described in details in ref 12.…”

Section: Methodsmentioning

confidence: 99%

Structure Deformation in GdCOB Single Crystals Grown by the Czochralski Method

Kłos

Domagała

Bajor

et al. 2008

Crystal Growth & Design

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Gadolinium calcium oxide borate GdCa4O(BO3)3 melts congruently, and single crystals with diameters of up to 35 mm and lengths of up to 70 mm were grown by the Czochralski method. Deformation of the crystal structure was observed. X-ray topography and conoscopic and polariscopic investigations revealed the core situated in the central part of the crystal, which was not visible with the naked eye. The relative (b/b av) difference in the lattice parameter b in the core region compared with the neighboring crystal areas was evaluated to be on the order of 9.6 × 10−4. Outside of the core region the mean value of the lattice parameter is constant, while fluctuations in spatial distribution of the Bragg angle were discovered. The effect of growth instabilities causes a certain deformation of the growth plane (interface). However, it did not disturb optical properties, and was quite a good crystalline area to yield a considerable second harmonic (532 nm) power in laser experiments.

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Automated birefringence dispersion measurements

Cited by 8 publications

References 16 publications

Assessment of gadolinium calcium oxoborate (GdCOB) for laser applications

Assessment of gadolinium calcium oxoborate (GdCOB) for laser applications

Key aspects ofl-threoninium picrate single crystal: an excellent organic nonlinear optical material with a high laser-induced damage threshold

Structure Deformation in GdCOB Single Crystals Grown by the Czochralski Method

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