Laser-induced local change in optical properties of alkaline-borosilicate glasses

Kostyuk, G. K.; Sergeev, M. M.; Антропова, Т. В.; Yakovlev, E. B.; Анфимова, И. Н.

doi:10.1134/s1087659613030115

Cited by 7 publications

(7 citation statements)

References 18 publications

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“…The estimate calculations and experimental results of temperature measured in the center of area of the effect indicate a non-thermal nature of the MA forming process [20,21]. According to the calculations given in these papers, the temperature rise in the center of the irradiated area at PG plate absorption ability A = 0.004 would have to be 0.2 K. Experimental studies of the temperature increase in the center of the laser beam waist, made using a 'Flip Titanium' 520 M (7) thermal imaging camera with a spatial resolution of 30 μm for the temperature range of 20-300 °C, showed that the temperature increase registered throughout the irradiation time was within the measurement error [20]. Although the nature of formation of such areas is not fully studied, it is likely to be related to the mass transfer of substances, partially filling a complex branched system of pores and channels of PG penetrating the silica framework.…”

Section: The Process Of Formationmentioning

confidence: 74%

“…Transmittance value τ, found by measuring the incident (P 0 ) and transmitted (P τ ) power with an accuracy of ±5% during the experiment, was found to be 0.950 ± 0.005. The low absorption of the PG plate used in the experiment on the emission wavelength, according to the calculations in [20], excluded heating PG by laser radiation and, therefore, the temperature increased in the area of effect. A view of the MA is shown in figure 2: where (a) is a photo of the plate surface; (b) is a MA photo with modified characteristics at depth of 360 μm from the plate surface; and, (b) is a view of the formed MA when viewed from the end face of the plate.…”

Section: Resultsmentioning

confidence: 99%

“…However, a MO with modified optical properties in the bulk of the plate is formed. The optical properties of MO are discussed in detail in [20]. In this paper our main attention is paid to the alleged processes of such MA formation and we have proposed a model to describe these processes that occur under the action of laser radiation and which lead to MA formation.…”

Section: The Processes Of Modified Microareas Formation In the Bulk O...mentioning

confidence: 99%

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The processes of modified microareas formation in the bulk of porous glasses by laser radiation

Kostyuk¹,

Sergeev²,

Yakovlev³

2015

Laser Phys.

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The possibility of the formation of modified microareas (MAs) with changed optical properties in the bulk of porous glasses (PGs) with laser radiation is investigated. A laser module of continuous action with wavelength λ = 800 nm and power P = 120 mW was used as the source of radiation. The material used in the experiment was PG of 94.73 SiO 2 -4.97 B 2 O 3 -0.30 Na 2 O. A model that describes the processes taking place under laser radiation that lead to a modification of the glass is proposed. Our evaluation results based on experimental data are given. The results of an additional PG plate of the same composition impregnated with glycerol-a substance with a high degree of polarizability-during exposure experiments are also given. A fiber laser of continuous action with wavelength λ = 1070 nm and power P = 16.5 W was used as a source of radiation.

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Section: The Process Of Formationmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: The Processes Of Modified Microareas Formation In the Bulk O...mentioning

confidence: 99%

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The processes of modified microareas formation in the bulk of porous glasses by laser radiation

Kostyuk¹,

Sergeev²,

Yakovlev³

2015

Laser Phys.

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“…An important part in the development and implementation of these laser technologies is assigned to optically transparent materials, where MAs are formed, for example, high silica porous glass (PG) [5,6]. It was shown in [7][8][9][10] that the formation of MAs of various shapes and sizes is possible in a bulk PG plate with the use of laser radiation, including a continuous laser with an emission wavelength which is weakly absorbed by PG. The high transmittance of PG plates in an optical wavelength range [11], their transformation to quartzoid glass upon sintering in furnace [12,13], and the possibility of retention of MAs in PG plates on sintering [8] give reasons to sug gest that this material is promising for the formation of MAs.…”

Section: Introductionmentioning

confidence: 99%

Local laser-induced change of optical properties in the bulk of photochromic porous silicate glass doped by silver and copper halides

et al. 2014

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“…In [7,9] it was assumed that the process leading to the formation of MR in the interior of a MIP-glass plate under the action of laser radiation which is practically not absorbed by the plate material could be associated with the mass transfer of the fine amorphous hydrated (by water molecules) silica lining the walls of the channels in the silica framework. The mass transfer occurs inside the irradiated region from the periphery into the central part of the MR, where the secondary constant electric field is strongest.…”

mentioning

confidence: 99%

Particulars of Structural Changes in Porous Glass Under the Action of Laser Radiation During ‘Cold’ Thermal Compaction

2014

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An attempt at local modification of the optical properties in the interior of macroporous glass plates with porosity 0.58 cm 3 /cm 3 and average channel size 50 -70 nm by means of laser radiation weakly absorbed in the material is reported. The source of radiation is an ytterbium fiber laser with radiation wavelength l = 1.07 mm, pulse duration t p~1 00 nsec and pulse repetition frequency n = 10 -100 kHz. The temperature and the power of the radiation passing through of the irradiated region versus the duration of the exposure are presented.One of the main directions of growth of modern laser technologies is the creation of modified regions (MR) with altered optical properties in glass and glass-ceramic materials [1,2]. The possibility of creating MR with a complex structure in the interior of optical materials and preserving functionality and quality of the MR created over long periods of operation is being intensively studied. The capability of MR to localize, reflect and refract as well as focus or scatter incident radiation makes it possible to find a wide range of applications of MR as functional micro-optic elements in rapidly developing areas of optoelectronics, integrated optics and photonics [3].As a rule, laser radiation with ultrashort pulses (t p = 10 -9 -10 -15 sec), high repetition frequency (n = 100 -250 kHz) and long wavelength (l = 0.8 mm) is used to create MR with a complicated structure in optically transparent materials [1, 2, 4 5]. Owing to the high power density (q = 10 10 -10 15 W/cm 2 ) nonlinear absorption of the incident radiation is possible in the region of focusing of the laser radiation, which gives rise to local heating and thermal change of the structure, i.e., the formation of a region with altered optical properties. A change in the optical properties of the region can be manifested as a change in the refractive index n [4] or absorptive power A of the material [5] as well as in the appearance of a crystal structure [2] or nonlinear optical susceptibility [6]. Such technologies make it possible to form MR with extended shape in the interior of the material, which can be regarded as waveguide structures [1,5,6].The trends in the development of laser technologies for forming MR in the interior of a material transparent to radiation for forming MR are a reduction of the laser power density to 10 4 -10 5 W/cm and switching to long pulse durations (10 -6 -10 -9 sec) or, as reported in [7 -9], to continuouswave radiation. These trends are based on the search for and development of new promising materials, one of which is porous glass (PG) [7 -9]. The advantages of PG over other optical materials are high thermal and radiation resistance and the possibility of regulating the parameters of the PG framework, which comprises a complicated, highly extended structure consisting of many channels and pores. These characteristics of PG make this material very promising for use in modern laser technologies for forming MR.Porous glass plates are obtained by removing a chemically unstable borate p...

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Laser-induced local change in optical properties of alkaline-borosilicate glasses

Cited by 7 publications

References 18 publications

The processes of modified microareas formation in the bulk of porous glasses by laser radiation

The processes of modified microareas formation in the bulk of porous glasses by laser radiation

Local laser-induced change of optical properties in the bulk of photochromic porous silicate glass doped by silver and copper halides

Particulars of Structural Changes in Porous Glass Under the Action of Laser Radiation During ‘Cold’ Thermal Compaction

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