title: Optimal Te-doping in GaSe for non-linear applications.
abstract: Centimeter-sized Te-doped GaSe ingots were grown from the charge compositions of GaSe with nominals 0.05, 0.1, 0.5, 1, and 3 mass% Te, which were identified as ε-GaSe:Te (0.01, 0.07, 0.38, 0.67, and 2.07 mass%) single crystals. The evolution of the absorption peaks of the phonon modes E'(2) (≈ 0.584 THz) and E"(2) (1.77 THz) on Te-doping in GaSe:Te crystals was studied by THz time-domain spectroscopy. This study proposes that the evolution of both E'(2) and E''(2) absorption peaks correlates well with the optical quality of Te-doped GaSe crystals, which was confirmed by experimental results on the efficiency of THz generation by optical rectification. Maximal intensity of the absorption peak of the rigid layer mode E'(2) is proposed as a criterion for identification of optimal Te-doping in GaSe crystals.
authors.affiliation: Department of Electrophysics, National Chiao-Tung University, Hsinchu, Taiwan.
authors.forename: Shin An
authors.initials: SA
authors.lastname: Ku
authors.forename: Wei-Chen
authors.initials: WC
authors.lastname: Chu
authors.forename: Chih Wei
authors.initials: CW
authors.lastname: Luo
authors.forename: Yu M
authors.initials: YM
authors.lastname: Andreev
authors.forename: Grigory
authors.initials: G
authors.lastname: Lanskii
authors.forename: Anna
authors.initials: A
authors.lastname: Shaidukoi
authors.forename: Tatyana
authors.initials: T
authors.lastname: Izaak
authors.forename: Valery
authors.initials: V
authors.lastname: Svetlichnyi
authors.forename: Kaung Hsiung
authors.initials: KH
authors.lastname: Wu
authors.forename: T
authors.initials: T
authors.lastname: Kobayashi
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005708:Gallium / Q000737:chemistry*; D008422:Materials Testing; D017711:Nonlinear Dynamics; D012031:Refractometry; D012643:Selenium / Q000737:chemistry*; D012666:Semiconductors; D013691:Tellurium / Q000737:chemistry*
chemical_list: C517764:gallium selenide; D005708:Gallium; D012643:Selenium; D013691:Tellurium