Study on optical weak absorption of borate crystals |
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| Affiliation: | 1. Key Lab of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy Sciences, Beijing 100190, China;2. University of the Chinese Academy of Sciences, Beijing 100049, China;3. China Center for Information Industry Development, Beijing 100846, China;1. Institute of Laser Physics SB RAS, Novosibirsk, Russia;2. Novosibirsk National Research State University, Novosibirsk, Russia;3. B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus, Minsk, Belarus;1. J.A. Woollam Co. Inc., 645 M Street, Lincoln, NE 68508, USA;2. Department of Physics, Chemistry, and Biology, Linköping University, SE 581 83 Linköping, Sweden;1. Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 50/24 Akademgorodok, Krasnoyarsk, 660036, Russia;2. Department of Chemistry, Siberian Federal University, Svobodny pr. 79, Krasnoyarsk, 660041, Russia;1. Physics Dep., Faculty of Science, King Khalid University, P. O. Box 9004, Abha, Saudi Arabia;2. Physics Dep., Faculty of Sciences, Aswan University, Aswan, Egypt;3. Physics Dep., Faculty of College of Arts & Sciences King Khalid University, Muhail Asir, Saudi Arabia;4. Physics Dep., Faculty of Science, Al- Azhar University, Assiut branch, Assiut, Egypt |
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| Abstract: | Borate crystal is an important type of nonlinear optical crystals used in frequency conversion in all-solid-state lasers. Especially, LiB3O5 (LBO), CsB3O5 (CBO) and CsLiB6O10 (CLBO) are the most advanced. Although these borate crystals are all constructed by the same anionic group-(B3O7)5?, they show different nonlinear optical properties. In this study, bulk weak absorption values of three borate crystals have been studied at 1064 nm by a photothermal common-path interferometer. The bulk weak absorption values of them along 1 0 0], 0 1 0] and 0 0 1] directions were obtained, respectively, to be approximately 17.5 ppm cm?1, 15 ppm cm?1 and 20 ppm cm?1 (LBO); 80 ppm cm?1, 100 ppm cm?1 and 40 ppm cm?1 (CBO); 600 ppm cm?1, 600 ppm cm?1 and 150 ppm cm?1 (CLBO) at 1064 nm. The results showed an obvious discrepancy of the values of these crystals along three axis directions. A correlation between the bulk weak absorption property and crystal intrinsic structure was then discussed. It is found that the bulk weak absorption values strongly depend on the interstitial area surrounded by the B–O frames. The interstitial area is larger, the bulk weak absorption value is higher. |
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| Keywords: | Nonlinear optical crystal Borate crystal Weak absorption |
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