摘要(英) |
Abstract
Bragg condition is very sensitive to incident wavelength. With this characteristic, we can diffract wavelength with appropriate Bragg structure. In this letter, we first design an aperiodic structure with the help of simulated anneal algorism which compensates reciprocal vectors of dual wavelength emitted in Nd doped solid state laser system.
Lithium Niobate is a great electro-optic crystal. With the high electric field poled, we can generate the structure we calculate previously on LN crystal. Thus, a 25 mm long, 5 mm in width and thickness of 0.5 mm aperiodic poled Lithium Niobate Bragg diffraction cascade 15mm long periodical poled Lithum niobate sum frequency Generation device is fabricated successfully.
In experiment, we measured the high diffraction efficiency both on 1064 nm and 1342 nm, 96% and 87% respectively, at –250 and -350 volt applied voltage. Furthermore, we put our chip into the Nd:YVO4 slid sate laser system and applied a periodic electric field to the chip, we can turn it into a cavity Q-switch device. With the sum frequency crystal BIBO, we can generate narrowand high peak power 593 nm output from dual emission wavelength of Nd 1064 nm and 1342 nm. In results, the yellow-orange light output with the pulse width of 8 ns and peak power of 430 W under 8.142 W of Nd absorption power at tempature 73℃.
|
參考文獻 |
[1] Maiman, T. H., Phys. Rev. Letters, 4, 564 (1960).
[2] P.A. Franken, et al, Physical Review Letters 7, p. 118 (1961)
[3] LE Myers, GD Miller, RC Eckardt, MM Fejer, RL … - Optics …,
1995 - opticsinfobase.org
[4] k.w. Su, y.t. Chang, y.f. Chen, “Power scale-up of the diode-pumped actively Q-switched Nd:YVO4 Raman laser with an undoped YVO4 crystal as a Raman shifter”, Appl. Phys. B 88, 47–50 (2007)
[5] Yung-Fu Chen, S. W. Tsai, “Diode-pumped Q-switched Nd:YVO4 yellow laser with intracavity sum-frequency mixing”, March 15, 2002 / Vol. 27, No. 6 / OPTICS LETTERS
[6] Y. Y. Lin, S. T. Lin, G. W. Chang, A. C. Chiang, and Y. C. Huang, Y. H. Chen, “Electro-optic periodically poled lithium niobate Bragg modulator as a laser Q-switch”, March 1, 2007 / Vol. 32, No. 5 / OPTICS LETTERS
[7] 曾冠翔碩士論文,”以電光非週期性晶格極化反轉鈮酸鋰晶體應用於雙波長雷射系統之腔內布拉格繞射元件之設計與研究”,2011
[8] Amnon Yariv, Pochi Yeh, “Optical Waves in Crystals”, 1984
[9]Robert W. Boyed “Nonlinear Optics”3th
[10]呂學璁碩士論文,” 以非週期性晶疇極化反轉鈮酸鋰晶體作為電光波長調變光參量產生器”,2011
[11] 張錫雄碩士論文, " 以單塊二維週期性晶格極化反轉鈮酸鋰同時作為Nd:YVO4雷射之電光Q調制器和腔內光參量振盪器”, 2010
[12] Gregory David Miller, “Periodically poled lithium
niobate: Modeling, fabrication, and nonlinear-optical”,
Stanford university (1998)
|