Dr. Aleksey V. Starobor Profile

Dr. Aleksey V. Starobor

Researcher at Institute of Applied Physics of the RAS

SPIE Involvement:

Author

Publications (4)

Proceedings Article | 27 November 2023 Paper

Terbium aluminum garnet and terbium hafnium pyrochlore ceramics for high-power magnetooptical applications

A. Starobor, O. Palashov, Lixuan Zhang, Jiang Li

Proceedings Volume 12760, 1276004 (2023) https://doi.org/10.1117/12.2688902

KEYWORDS: Ceramics, Depolarization, Laser radiation, Absorption, Terbium, Sintering, Magneto-optics, Garnet, Thermal effects

Read Abstract +

Proceedings Article | 27 November 2023 Paper

High-energy gradient doped Yb:YAG thin slab laser amplifier

A. Starobor, D. Kuzin, I. Kuznetsov, O. Palashov

Proceedings Volume 12760, 1276006 (2023) https://doi.org/10.1117/12.2687175

KEYWORDS: Laser radiation, Doping, Lasers, Laser amplifiers, Crystals, Thermal effects, Absorption

Read Abstract +

Proceedings Article | 13 May 2019 Presentation

Anisotropic CeF3 crystal as media for high-power Faraday isolators (Conference Presentation)

Aleksey Starobor, Oleg Palashov

Proceedings Volume 11033, 110330M (2019) https://doi.org/10.1117/12.2520523

KEYWORDS: Crystals, Optical isolators, Laser crystals, Crystal optics, High power lasers, Thermography, Cerium, Laser systems engineering, Terbium, Gallium

Read Abstract +

At present, Faraday isolators (FIs) working with high power laser radiation mainly use terbium gallium garnet (TGG) crystals as media for magneto-optical elements. High optical quality TGG crystals are commercially available, however it has several disadvantages: a large thermally induced lens and relatively high level of thermally induced depolarization. Therefore, at present, there are attempts to create a magnetoactive media that would replace TGG: the most promising media are TSAG, KTF and NTF crystals and also TAG ceramics. We propose to use cerium fluoride (CeF3) crystal, which is uniaxial, but superior to TGG in thermo-optical characteristics. CeF3 crystal is known for a long time, as found in nature in the composition of various minerals (fluorite, tisonite). More recently, it began to be used as a fast, high radiation hardness scintillator. Cerium Fluoride is a good scintillation crystal with high density and short decay time. Its high Verdet constant and paramagnetic nature of rotation have been known from the 30s of the 20th century. Another important advantage from the viewpoint of using this material in high-power laser systems is a possibility of producing large-aperture (up to ~10 cm) optical elements from CeF3. In this respect CeF3 surpasses most of the magneto-active crystal media. For example, the largest aperture of a TGG single crystal with quality fit for producing an FI is only 40 mm. The CeF3 crystal is transparent in a wide range of visible and near IR wavelengths (300-2500 nm) and has a high Verdet constant in this area whereas the TGG crystal becomes optically nontransparent starting from ~1.4 mm. At radiation wavelength of λ=1 µm, the Verdet constants of TGG and CeF3 are almost equal (37 and 36.7 rad/T/m respectively), which ensures an equal length of crystals, and they can be replaced one by one in FI. We measured the thermally induced depolarization and thermal lens in this crystal. When the radiation power approaches 1 kW, the dependence of thermally induced depolarization on laser power becomes quadratic and almost coincides to the analogous dependence for the TGG crystal with absorption coefficient of 1.5*10-3 cm-1. However the thermal lens induced in CeF3 has a 6.5 lower optical strength for the same laser beam parameters. We created a Faraday isolator on CeF3 using a magnetic system with a field strength of 2.8 kOe. The crystal length was 8 mm. Up to a power of 700 W, the degree of isolation was no worse than 30 dB; it was practically independent of laser power and was determined by the quality of the crystal. It should be noted that the uniaxial nature of the crystal imposes restrictions on the divergence of the laser beam, which should not exceed 8 mrad to maintain the degree of isolation. The mentioned advantages together with the feasibility of producing large-aperture elements allow us to conclude that the CeF3 crystal is promising for developing FIs for high-power laser systems.

Proceedings Article | 12 May 2015 Paper

Thermally induced depolarization in the optical elements of the transition configuration: thick disks and short rods

A. Starobor, O. Palashov

Proceedings Volume 9513, 95130L (2015) https://doi.org/10.1117/12.2178663

KEYWORDS: Heatsinks, Optical components, Chemical elements, Transition metals, Magnetism, Photoelasticity, Crystals, Laser crystals, Solids, Numerical modeling

Read Abstract +

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years