Optoelectronics Letters, Volume. 14, Issue 5, 359(2018)
Mechanism of the UV band-edge photorefractivity en-hancement in near-stoichiometric LiNbO3
The UV photorefractive properties of near-stoichiometric LiNbO3 single crystal are found to be significantly enhanced com-pared with the congruent one at 325 nm. The temperature dependence of the band edge of near-stoichiometric LiNbO3 crystal is investigated. Significant thermal-induced spectral shift in band gap which obeys the Bose-Einstein expression is observed, and the fundamental band gap at zero absolute temperature is found to be much larger than the congruent one. New absorp-tion bands near the UV band edge which are much stronger in the near-stoichiometric LiNbO3 than those in the congruent LiNbO3 crystal show up at temperatures lower than ~400 K. Note that the UV photorefractivity is enhanced in SLN, which has exactly the same tendency as the absorption strength.
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XIN Fei-fei. Mechanism of the UV band-edge photorefractivity en-hancement in near-stoichiometric LiNbO3[J]. Optoelectronics Letters, 2018, 14(5): 359
Category: Materials
Received: Mar. 7, 2018
Accepted: Apr. 18, 2018
Published Online: Apr. 16, 2019
The Author Email: Fei-fei XIN (cindyfeifei@163.com)