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Wyznaczanie termodyfuzyjności kryształów CdMgSe z wykorzystaniem techniki radiometrii w podczerwieni

Pawlak M., Maliński M. A.

Zeszyty Naukowe Wydziału Elektroniki i Informatyki Politechniki Koszalińskiej

2013

Nr 5

55--62

W pracy została wyznaczona termodyfuzyjność mieszanych kryształów półprzewodnikowych CdMgSe za pomocą radiometrii w podczerwieni. Badane próbki w obszarze widmowym pracy detektora są półprzepuszczalne dla promieniowania podczerwonego. Otrzymane wartości termodyfuzjności dla kryształów półprzewodnikowych CdMgSe za pomocą technik PPE i PTR różnią się w niewielkim stopniu.

In this paper the thermal diffusivities of CdMgSe mixed crystals were determined by means of the photothermal radiometry. Investigated samples are semi-transparent in the infrared range. Obtained results are in a reasonable agreement with those determined from the photopyroelectric technique (PPE).

Study of the third order nonlinear optical properties of Zn1-xMgxSe and Cd1-xMgxSe crystals

Derkowska B., Firszt F., Sahraoui B., Marasek A., Kujawa M.

Opto-Electronics Review

2008

Vol. 16, No. 1

8-11

Third order nonlinear optical susceptibilities χ³ of ternary Zn₁-xMgxSe and Cd₁-xMgxSe crystals have been measured using standard degenerate four-wave mixing (DFWM) method at 532 nm. The nonlinear transmission technique has been applied to check if our crystals exhibit two-photon absorption. The studied Zn₁-xMgxSe and Cd₁-xMgxSe solid solutions were grown from the melt by the modified high-pressure Bridgman method. For both crystals the energy gap increases with increasing Mg content. In the case of Zn₁-xMgxSe, it was found that the value of third order nonlinear optical susceptibility χ³ decreases with increasing Mg content. An explanation of this behaviour results from the dependence of optical nonlinearities on the energy band gap Eg of the studied crystals. In the case of Cd₁₋xMgxSe with low content of Mg, no response was observed for the studied wavelength since the energy gap in such crystals is smaller than the photon energy of the used laser radiation. It was also found that the value of third order nonlinear optical susceptibility χ³ for Cd₀.₇₀Mg₀.₃₃ is higher than for Zn₀.₆₇Mg₀.₃₃Se. This behaviour can be understood if one take into consideration that the free carrier concentration in Cd₁₋xMgxSe samples is about four orders of magnitude higher than that in Zn₁₋x MgxSe ones with comparable Mg content respectively. It is commonly known that when the electric conductivity increases, the values of nonlinear optical properties increase. From the performed measurements one can conclude that the incorporation of Mg as constituent into ZnSe and CdSe crystals leads to a change of the third order nonlinear optical susceptibilities.