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A new kind of Cr4+ :Ca2GeO4 infrared tunable laser crystals were synthesized by flux growth method with CaCl2 as solvent. The structure of Cr4+ :Ca2GeO4 was characterized by x ray diffraction, Raman spectroscopy (RS) and x ray photoelectron spectroscopy(XPS). The results showed that the obtained crystal was γ-Cr4+ :Ca2GeO4 single crystal with monoclinic structure belonging to olivine structure, and the lattice parameters are: a=5.3209 (1 =0.1 nm), b=6.6648 , c=11.2606 . The result that (GeO4)4- exists in the crystal was verified by RS measurement and its vibration was determined. We can see from the XPS measurement that Cr in the crystal is in the form of Cr4+ and no other valence states exist.
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Keywords:
- Cr4+ :Ca2GeO4 laser crystal /
- x ray diffraction /
- Raman spectra /
- x ray photoelectron spectroscopy
[1] Chen W, Xia S D, Tang H G,Liu J Q, Zang J C,Wang S K 1994 Acta Phys. Sin. 43 851(in Chinese)[陈 伟、夏上达、汤洪高、刘竞青、藏竞存、万寿科 1994 43 851]
[2] Gan F X, Deng P Z 1996 Laser Material (Shanghai: Shanghai Scientific and Technical Publishers) p312 (in Chinese) [干福熹、邓佩珍 1996 激光材料 (上海:上海科学技术出版社) 第312页]
[3] Yang L, Huang W L, Qiu J L, Feng B H, Zhang Z G, Gaebler V, Liu B N, Eichler H 2003 Acta Phys. Sin. 52 10 (in Chinese) [杨 林、黄维玲、丘军林、冯宝华、张治国、Gaebler V、 Liu B N、 Eichler H 2003 52 10]
[4] Hazenkamp M F, Oetliker U, Güdel H U, Kesper U, Reinen D 1995 Chem. Phys. Lett. 233 466
[5] Brunold T C, Gudet H U, Hazenkamp M F, Huber G, Kück S 1997 Appl. Phys. B 650 647
[6] Bykov A B, Petricecic V, Steiner J, Yao D, Isaacs L L, Kokta M R, Alfano R R 2000 J. Cryst. Growth 211 295
[7] Xu J 2006 The Front Scientific and Technology of Laser Material (Shanghai: Shanghai Jiao Tong University Press) p153 (in Chinese) [徐 军 2006 激光材料科学与技术前沿 (上海: 上海交通大学出版社) 第153页]
[8] Petri Dcˇ evi Dc' V, Bykov A B, Evans J M, Alfano R R 1996 Opt. Lett. 21 1750
[9] Xu B, Evans J M, Petricevic V, Guo S P, Maksimov O, Tamargo M C, Alfano R R 2000 Appl. Opt. 39 4975
[10] Demos S G, Calistru D, Owen S, Bykov A, Petricevic V, Alfano R R 1999 Phys. Rev. Lett. 82 2556
[11] Sharonov M Y, Bykov A B, Myint T, Petricevic V, Alfano R R 2007 Opt. Commun. 275 123
[12] Fukaya S, Adachi K, Obara M, Kumagai H 2001 Opt. Commun. 187 373
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[1] Chen W, Xia S D, Tang H G,Liu J Q, Zang J C,Wang S K 1994 Acta Phys. Sin. 43 851(in Chinese)[陈 伟、夏上达、汤洪高、刘竞青、藏竞存、万寿科 1994 43 851]
[2] Gan F X, Deng P Z 1996 Laser Material (Shanghai: Shanghai Scientific and Technical Publishers) p312 (in Chinese) [干福熹、邓佩珍 1996 激光材料 (上海:上海科学技术出版社) 第312页]
[3] Yang L, Huang W L, Qiu J L, Feng B H, Zhang Z G, Gaebler V, Liu B N, Eichler H 2003 Acta Phys. Sin. 52 10 (in Chinese) [杨 林、黄维玲、丘军林、冯宝华、张治国、Gaebler V、 Liu B N、 Eichler H 2003 52 10]
[4] Hazenkamp M F, Oetliker U, Güdel H U, Kesper U, Reinen D 1995 Chem. Phys. Lett. 233 466
[5] Brunold T C, Gudet H U, Hazenkamp M F, Huber G, Kück S 1997 Appl. Phys. B 650 647
[6] Bykov A B, Petricecic V, Steiner J, Yao D, Isaacs L L, Kokta M R, Alfano R R 2000 J. Cryst. Growth 211 295
[7] Xu J 2006 The Front Scientific and Technology of Laser Material (Shanghai: Shanghai Jiao Tong University Press) p153 (in Chinese) [徐 军 2006 激光材料科学与技术前沿 (上海: 上海交通大学出版社) 第153页]
[8] Petri Dcˇ evi Dc' V, Bykov A B, Evans J M, Alfano R R 1996 Opt. Lett. 21 1750
[9] Xu B, Evans J M, Petricevic V, Guo S P, Maksimov O, Tamargo M C, Alfano R R 2000 Appl. Opt. 39 4975
[10] Demos S G, Calistru D, Owen S, Bykov A, Petricevic V, Alfano R R 1999 Phys. Rev. Lett. 82 2556
[11] Sharonov M Y, Bykov A B, Myint T, Petricevic V, Alfano R R 2007 Opt. Commun. 275 123
[12] Fukaya S, Adachi K, Obara M, Kumagai H 2001 Opt. Commun. 187 373
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