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전기장에 의한 Bi<sub>12</sub>SiO<sub>20</sub> 단결정의 변화된 광행로길이 계산
이수대,Lee, Su-Dae 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.11
The formula to calculate a variation of optical path length of single crystal by the electric field was derived by this study. The formula was applied to $Bi_{12}SiO_{20}$ single crystal. The results are as follows. In case of the applied electric field in the body diagonal direction and the passing light along the same direction, the variation of optical path length had the largest value. The symmetry of the space distribution of optical path length satisfied $E3C_2\;8C_3$, the set of elements of the symmetry of $Bi_{12}SiO_{20}$ single crystal. The property which gave the largest influence to the variation of optical path length is the strain of length by the Inverse piezoelectric effect. The second influence, is the variation of the refractive index by the electro-optic effect. The variation of optical path length by the inverse piezoelectric effect and by the electro-optic effect have a reverse sign each other.
Kouhi, Mohammad,Vahedi, Ali,Akbarzadeh, Abolfazl,Hanifehpour, Younes,Joo, Sang Woo Springer 2014 NANOSCALE RESEARCH LETTERS Vol.9 No.1
<P>Quadratic electro-optic effects (QEOEs) and electro-absorption (EA) process in a GaN/AlGaN spherical quantum dot are theoretically investigated. It is found that the magnitude and resonant position of third-order nonlinear optical susceptibility depend on the nanostructure size and aluminum mole fraction. With increase of the well width and barrier potential, quadratic electro-optic effect and electro-absorption process nonlinear susceptibilities are decreased and blueshifted. The results show that the DC Kerr effect in this case is much larger than that in the bulk case. Finally, it is observed that QEOEs and EA susceptibilities decrease and broaden with the decrease of relaxation time.</P>
박철우,정치섭,Park, Chul-Woo,Jung, Chi-Sup 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.3
The electro-optic properties in Langmuir Blodgett films of poly (vinylidene fluoride trifluoroethylene) are investigated in the crossover region between two and three dimensions. The absence of finite size effect is observed in the films thinner than 20 nm, which confirms that these films are two dimensional ferroelectrics. The copolymer LB film of P(VDF-TrFE) exhibits the largest electro-optic response(26 pm/V) at 10 layer thickness. The cross-over behavior of electro-optic effect around the 10 layer thickness was discussed with the formation of nanomesa after thermal annealing.
Jie Wang,Jianhong Shi,Linghao Tian,Xianfeng Chen 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.8
In this paper, we theoretically propose a new method to generate and tune the optical orbital angular momentum. A focused Gaussian beam passing through an optical superlattice under the electro-optic effect carries orbital angular momentum (OAM). This kind of OAM arises from the curl of the polarization. By adjusting the external electric field, the beam waist radius and the crystal length, we can obtain a dramatic variation of the OAM across the output light transverse section. This invention will find applications in the area of optical manipulation.
두 개의 레이저 결정을 사용하여 이중으로 단면 펌핑하여 전기 광학적으로 Q- 스위치된 1064 nm Nd:YVO4 레이저
박광렬,박차곤,추한태,이건희 한국물리학회 2020 새물리 Vol.70 No.4
We investigated the output characteristics of a continuous wave, electro-optically Q-switched 1064-nm Nd:YVO4 laser with two laser crystals and a double-end pump with two laser diodes. In the continuous-wave operating mode, the output power and the slope efficiency were measured as 10.3 W and 36%, respectively, when the pumping powers of both pumping lasers were 16 W. In the Q-switched mode, the pulse energy and the pulse width were measured as 667 ± 3.17 J and 23.6 0.84 ns, respectively, and the corresponding peak power was up to 28.8 kW. The Q-switched output showed very stable temporal behavior. Also, we analyzed the thermal lens effects of Nd:YVO4 crystals by using the ABCD matrix method and found that the thermal lensing effect in solid-state laser was reduced. 두 개의 Nd:YVO4 결정을 사용하고 두 대의 레이저 다이오드로 단면 펌핑하는 연속발진 및 전기 광학적으로 Q-스위치된 1064 nm Nd:YVO4 레이저의 출력특성을 조사하였다. 두 대의 레이저 다이오드 입사펌프가 동시에 각각 16 W 일 때, 연속발진 1064 nm Nd:YVO4 레이저의 출력은 10.3 W로 측정되었으며, 기울기 효율은 36%로 측정되었다. 전기 광학적으로 Q-스위치된 1064 nm Nd:YVO4 레이저의 펄스 에너지및 펄스 폭은 각각 667 ± 3.17 J, 23.6 ± 0.84 ns 로 측정되었으며, 첨두 출력값은 28.8 kW를 가진다. 또한 시간에 따른 Q-스위치된 출력이 안정됨을 확인하였다. 열 렌즈가 포함된 공진기 구조를 ABCD 광선전파행렬을 이용하여 Nd:YVO4 결정에서의 열 렌즈 효과 분석을 통해 고체 레이저에서 발생하는 열렌즈효과가 감소함을 확인하였다
An Optical Intense 2D Electric Field Sensor Using a Single LiNO 3 Crystal
Yuanying Zhang,Jiahong Zhang,Yingna Li,Hongyi Lei 한국광학회 2022 Current Optics and Photonics Vol.6 No.2
Based on the linear electro-optic (EO) effect of lithium niobite (LiNbO 3 , LN) crystal, an intense twodimensional (2D) electric field sensor was analyzed, fabricated and experimentally demonstrated. The linear polarized light beam transmits along the optical axis (z-axis) of the LN crystal, and the polarization direction of the polarized light is 45° to the y-axis. The sensor can detect the intensity of a 2D electric field that is perpendicular to the z-axis. Experimental results demonstrated that the minimum detectable electric field of the sensor is 10.5 kV/m. The maximum detected electric field of the sensor is larger than 178.9 kV/m. The sensitivity of the sensor is 0.444 mV/(kV·m −1 ). The variation of the sensitivity is within ±0.16 dB when the sensor is rotated around a z-axis from 0° to 360°. The variation of the sensoroutput optical power is within ±1.4 dB during temperature change from 19 ℃ to 26 ℃ in a day (from 7:00 AM to 23:00 PM) and temperature change from 0 ℃ to 40 ℃ in a controllable temperature chamber. All theoretical and experimental results revealed that the fabricated sensor provides technology for the direct detection of intense 2D electric fields.
전기광학 효과를 이용한 Er:YAG 레이저의 Q-switching
이상호,추한태,김규욱 한국물리학회 2009 New Physics: Sae Mulli Vol.58 No.2
We have performed experiments on the electro-optic Q-switching of an Er:YAG laser by using a LiNbO3 Pockels cell with Brewster-angle faces. The optimal conditions for single-pulse generation with maximum energy and minimum pulse width were found experimentally. An output energy of 5 mJ and a pulse width of 120 ns were obtained when the pumping energy was 130 J, the repetition rate was 4 Hz, the applied voltage to the Pockels cell was 2.4 kV, and the time delay between the Xe flashlamp and the Pockels cell was 430~445 μs. 전기광학 효과를 이용하여 Er:YAG 레이저를 Q-switching시켰다. 전기광학소자인 LiNbO3 포켈셀은 양면이 브루스터각으로 이루어져 있다. 포켈셀의 전압, 동작 시간차, 레이저 동작 주파수, 레이저 펌핑 에너지의 변화에 대하여 Q-switching된 Er:YAG 레이저 펄스의 에너지와 펄스폭을 측정 하였다. 그 결과 펌핑 에너지 130 J, 레이저 동작 주파수 4 Hz, 포켈셀의 동작 전압이 2.4 kV, 포켈셀의 동작 시간차가 430~445μs일 때 Q-switching 펄스의 출력 에너지는 5 mJ, 펄스폭은 120 ns로 측정되었다.
김명희,Mai Ha Hoang,최동훈,조민주,주현경,김동욱,이창진 한국고분자학회 2011 Macromolecular Research Vol.19 No.4
A new soluble and thermally stable nonlinear optical (NLO) polyimide was synthesized by adding both tricyanopyrroline (TCP)- and tricyanofuran (TCF)-based NLO chromophores into the polymer backbone. The NLO polyimide (PI-II) bearing two different chromophores with different sizes has a glass transition temperature of 146℃ and exhibits good film forming properties. The electro-optic coefficient of the film was 84 pm/V at 1.3 μm under a poling field of 80V/μm, even though PI-II has an unusually high chromophore density of approximately 20 wt% of TCP chromophores and 23 wt% of TCF chromophores. Even with a overall chromophore loading of 43 wt%, no severe aggregation effect was observed for the sample that exhibited a relatively high EO coefficient.
Hassan Aghababaeian,Mohammad-Hashem Vadjed-Samiei 한국광학회 2012 Current Optics and Photonics Vol.16 No.3
In this paper, we have proposed a principle to design a compact and temperature independent electro-optic switch based on a slotted photonic crystal directional coupler (SPCDC). Infiltration of the slotted silicon photonic crystal with polymer enhances the slow light and decreases the switching length,whereas the different signs of thermo-optic coefficients of the polymer and silicon make the proposed switch stable within 25℃ to 85℃ temperature range. The SPCDC structure is modified to increase poling efficiency of the polymer in the slot and to flatten the dispersion diagram of the even mode to minimize the switching length.