Spatial light modulation for ultra-fast optics by wave-mixing in saturable amplifier

通过可饱和放大器中的混波实现超快光学的空间光调制

• 批准号: 13650037
• 负责人: OMATSU Takashige
• 金额: $ 2.11万
• 依托单位: Chiba University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650037/
• 关键词: Optical Phase Conjugation; Solid dye laser; Ultra-fast Optics; Saturable amplification; Nonlinear Optics; 位相共役鏡; 光空間変調器; 固体色素; 位相共役波発生; 利得回折格子; 固体色素レーザー; ホログラム; 色素凝集体; 波長可変レーザー; 縮退四光波混合

Ultrafast lasers in pico-and femto-second regime have received intense attention in many fields : including extra-ultra-violet generation, laser machining, spectroscopy, and medical applications, etc. These applications require laser sources with high beam quality.An effective solution to correct an aberration in the laser system and generate high quality output is phase conjugation. Phase conjugation by four-wave mixing in a saturable gain medium has been an attractive subject because of its high phase conjugate reflectivity and fast temporal response. To date, efficient phase conjugation in the nano-second or CW regime has been, demonstrated.However, efficient phase conjugation in pico-and femto-second regime requires a broad emission band as well as a high small-signal gain, which makes ultrafast operation more difficult to achieve. A solid laser dye is a promising material for an efficient and tunable solid-state phase conjugate mirror because of its large stimulated emission cross-section and broad fluorescence band in the visible and near-infrared regions.We have demonstrated efficient phase conjugation for pico-second pulses with a solid dye. A phase conjugate reflectivity of 2.5 times was obtained. This value is the highest, to our knowledge, obtained by four-wave mixing in the pico-second regime.

皮秒和飞秒超快激光在超紫外激光、激光加工、光谱学、医学等领域受到广泛关注，这些应用对激光光源的光束质量提出了更高的要求，相位共轭技术是解决激光系统中像差的有效方法。可饱和增益介质中四波混频相位共轭由于其高的相位共轭反射率和快速的时间响应而受到人们的关注。迄今为止，人们已经在纳秒或连续波波段实现了有效的相位共轭，然而，皮秒和飞秒波段的有效相位共轭需要宽的发射带和高的小信号增益，这使得超快工作更加难以实现。固体激光染料具有大的受激发射截面和宽的可见光和近红外荧光带，是一种很有前途的可调谐固体相位共轭镜材料，我们已经成功地实现了皮秒脉冲的相位共轭。获得了2.5倍的相位共轭反射率。这个值是最高的，据我们所知，获得四波混频在皮秒制度。

项目成果

T.Yonekawa, T.Omatsu: "Self-diffraction of pico-second pulses in a saturable amplifier polymer dye"Optics Communications. (in press). (2002)

T.Yonekawa、T.Omatsu：“可饱和放大器聚合物染料中皮秒脉冲的自衍射”光学通讯。

T.Omatsu, Y.Ojima et al.: "150 times phase conjugation by degenerate four-wave-mixing in a continuous-wave Nd : YVO_4 amplifier"Applied Physics B. 75. 493-495 (2002)

T.Omatsu、Y.Ojima 等人：“连续波 Nd : YVO_4 放大器中简并四波混频的 150 倍相位共轭”应用物理学 B.75.493-495 (2002)

T.Hirose, T.Omatsu, et al.: "Azo-beuzene polymer thin-film laser amplifier with grating couplers based on light-induced relief hologram"Optics Communications. 228. 279-283 (2003)

T.Hirose、T.Omatsu 等人：“基于光诱导浮雕全息图的带有光栅耦合器的偶氮苯聚合物薄膜激光放大器”光学通讯。

T.Hirose, T.Omatsu, et al.: "Azo-benzene polymer thin-film laser amplifier with grating couplers based on light-induced relief hologram"Optics Communications. 228. 279-283 (2003)

T.Hirose、T.Omatsu 等人：“基于光诱导浮雕全息图的带有光栅耦合器的偶氮苯聚合物薄膜激光放大器”光学通讯。

T.Yonekawa, T.Omatsu et al.: "Self-diffraction of pico-second pulses in a saturable amplifier polymer dye"Optics Communications. 206. 165-170 (2002)

T.Yonekawa、T.Omatsu 等人：“可饱和放大器聚合物染料中皮秒脉冲的自衍射”光学通讯。