Study of the thermooptical constants of magnetooptic glasses

Andreev, N. F.; Babin, A. A.; Zarubina, T. V.; Kiselev, A. M.; Palashov, O.; Khazanov, E. A.; Shchavelev, O. S.

doi:10.1364/jot.67.000556

Cited by 12 publications

(8 citation statements)

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“…For example, in glasses Q changes by only 10 -20% from the first to the second harmonic of the Nd:YAG laser. 22 A pure TGG crystal does not have absorption resonances near these wavelengths, although it is possible that intrinsic impurities have resonances near these wavelengths.…”

Section: Discussionmentioning

confidence: 99%

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Effect of terbium gallium garnet crystal orientation on the isolation ratio of a Faraday isolator at high average power

Хазанов¹,

Andreev²,

Palashov³

et al. 2002

Appl. Opt.

127

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We present a comprehensive and systematic investigation of the fundamental physical limitations of Faraday isolation performance at high average powers that are due to thermally induced birefringence. First, the operation of various Faraday isolator designs by use of arbitrary orientation of cubic magneto-optic crystals is studied theoretically. It is shown that, for different Faraday isolator designs, different crystal orientations can optimize the isolation ratio. Second, thermo-optic and photoelastic constants for terbium gallium garnet crystals grown by different manufacturers were measured. Measurements of self-induced depolarization are made for various orientations of crystallographic axes. The measurements are in good agreement with our theoretical predictions. Based on our results, it is possible to select a crystal orientation that optimizes isolation performance at high average powers, resulting in a 5-dB enhancement over nonoptimized orientations.

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Section: Discussionmentioning

confidence: 99%

“…However, the absorption coefficient strongly varies from sample to sample. For magneto-optically active media, values of Q were measured, to the best of our knowledge, only for glasses, 21,22 whereas has been measured only for yttrium iron garnet crystals ͑ ϭ 1.7͒. 23 In Ref.…”

Section: Introductionmentioning

confidence: 99%

Effect of terbium gallium garnet crystal orientation on the isolation ratio of a Faraday isolator at high average power

Хазанов¹,

Andreev²,

Palashov³

et al. 2002

Appl. Opt.

127

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“…The matrices for the rotator, plate and polarizer are well known 7where are the rotation angles. Bearing in mind the linear birefringence, a Faraday rotator that rotates the polarization plane by an angle can be described by the following Jones matrix [21], [22]: (8) where (9) is the angle of inclination of the linear eigenpolarization relative to the axis (see Fig. 2), is the refractive index averaged for two eigenpolarizations.…”

Section: Efficiency Of Mode Distortion Compensationmentioning

confidence: 99%

“…The measured value of (32) is close to that in the Schott catalog, K for a wavelength of 589 nm. For some glasses, it is known that very weakly depends on wavelength [9]. However, keeping in mind that the accuracy of cm may be not very high, it is important to note that the value of the product is measured with high accuracy K cm (33)…”

Section: A Measurement Of Thermooptical Constantmentioning

confidence: 99%

Compensation of thermally induced modal distortions in Faraday isolators

Хазанов

Andreev

Mal’shakov

et al. 2004

IEEE J. Quantum Electron.

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Two methods of compensation of thermal lensing in high-power terbium gallium garnet (TGG) Faraday isolators have been investigated in detail: compensation by means of an ordinary negative lens and compensation using FK51 Schott glass possessing a negative. Key thermooptic constants for TGG crystals and FK51 glass were measured. We find that the contribution of the photoelastic effect to the total thermal lens cannot be neglected for either TGG or FK51. We define a figure of merit for compensating glass and show that for FK51, an ordinary negative lens with an optimal focus is more efficient, but requires physical repositioning of the lens for different laser powers. In contrast, the use of FK51 as a compensating element is passive and works at any laser power, but is less effective than simple telescopic compensation. The efficiency of adaptive compensation can be considerably enhanced by using a compensating glass with figure of merit more than 50, a crystal with natural birefringence or gel.

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“…In particular, Faraday isolators (FI) are strongly affected by thermal selfaction, since the absorption in magneto-optical media is relatively high. A number of papers have been devoted to investigations of self-induced thermal effects in magneto-optical media [3][4][5][6][7][8][9][10][11][12][13][14][15][16] . The absorption of radiation in optical elements of FIs generates a temperature distribution that is nonuniform over a transverse cross section.…”

Section: Introductionmentioning

confidence: 99%

Adaptive compensation of thermal lens in Faraday isolators

Хазанов¹,

Poteomkin²,

Zelenogorsky³

et al. 2004

SPIE Proceedings

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Two methods of compensation of thermal lensing in high wer terbium gallium garnet (TGG) Faraday isolators have been investigated in detail: compensation by means of an ordinary negative lens and compensation using FK51 Schott glass possessing a negative dn/dT. Key thermo-optic constants for TGG crystals and FK51 glass were measured. We find that the contribution of the photo-elastic effect to the total thermal lens cannot be neglected either for TGG or for FK51. We define a figure of merit for compensating glass and show that for FK51, an ordinary negative lens with an optimal focus is more efficient, but requires physical repositioning of the lens for different laser powers. In contrast, the use of FK51 as a compensating element is passive and works at any laser power, but is less effective than simple telescopic compensation. The efficiency of adaptive compensation can be considerably enhanced by using a compensating glass with figure of merit more than 50, a crystal with natural birefringence or gel.

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Study of the thermooptical constants of magnetooptic glasses

Cited by 12 publications

References 0 publications

Effect of terbium gallium garnet crystal orientation on the isolation ratio of a Faraday isolator at high average power

Effect of terbium gallium garnet crystal orientation on the isolation ratio of a Faraday isolator at high average power

Compensation of thermally induced modal distortions in Faraday isolators

Adaptive compensation of thermal lens in Faraday isolators

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