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.

皮秒和飞秒范围的超快激光器在许多领域受到了强烈关注：包括超紫外光产生、激光加工、光谱学和医疗应用等。这些应用需要具有高光束质量的激光源。有效的解决方案相位共轭是校正激光系统中的像差并产生高质量输出的方法。可饱和增益介质中四波混频的相位共轭因其高相位共轭反射率和快速时间响应而成为一个有吸引力的课题。迄今为止，纳秒或连续波范围内的有效相位共轭已经得到证明。然而，皮秒和飞秒范围内的有效相位共轭需要宽发射带以及高小信号增益，这使得超快操作较难实现。固体激光染料因其受激发射截面大、可见光和近红外区域宽的荧光带而成为高效、可调谐固态相位共轭镜的有前途的材料。我们已经证明了皮秒的高效相位共轭。用固体染料进行第二次脉冲。获得2.5倍的相位共轭反射率。据我们所知，该值是通过皮秒范围内的四波混频获得的最高值。