Realization of a highly accurate optical frequency measurement system by novel frequency chain

通过新型频率链实现高精度光学频率测量系统

• 批准号: 03555006
• 负责人: OHTSU Motoichi
• 金额: $ 10.37万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03555006/
• 关键词: Semiconductor laser; Optical phase locking; Modulation; Frequency measurement; Nonlinear optical wavelength conversion; Negative feedback; 負帰環制御; スペクトル; 半導体レ-ザ; 注入同期; 光周波数; ヘテロダイン; 非線形光学; 共振器

By applying a negative electrical feedhack to a multi-quantum well distributed feedback laser at 1.5 um wavelength, its spectral linewidth was reduced to 250 Hz. By using this laser as the master laser for an infection locking system, improvement of coherence and frequency stabilization of a high power laser was realized. An optical frequency comb generator was developed to generate an intermediate frequency signal. That is, modulation sidebands over 4 THz frequency span was realized by modulating the master laser by using an electro-optical modulator installed in a Fabry-Perot cavity.By irradiating a 1.5 um-wavelength semiconductor laser light and 1.0 um-wavelength YAG laser light to a lithium niobate crystal of 310ﾟC, a sumfrequency signal between these lasers was generated. Its wavelength and power were 0.63 um and 0.7 uW, respectively. An optical phase locking was realized by mixing this signal with a frequency-stabilized Hi-Ne laser light. The phase error variance was reduced to a … More s low as 0.05 radian^2, from which a stable homodyne optical phase socking was confirmed.By the results obtained above, a frequency chain for frequency measurement system was realized between the primary frequency standard using a He-Ne laser and the secondary frequency standard using a narrow-linewidth semiconductor laser of 1.5 um-wavelengh. Furthermore, optical frequency comb generator was developed to connect the secondary frequency standard and the laser under measurement. The accuracy of frequency measurement was estimated to be as high as 1 x 10^<-10>, by which the optical frequency measurement with the highest accuracy was confirmed.As an application of the present optical frequency measurement system, a novel frequency chain for the wavelength of 0.6 - 1.3 um was proposed by using a calcium spectral line at 0.65 um-wavelength as the frequency standard and nine semiconductor lasers as slave oscillator. Experiments on the second harmonic and sum-frequency generations for this system were carried out. Less

通过对 1.5 um 波长的多量子分布良好反馈激光器应用负电反馈，其光谱线宽减小至 250 Hz。通过使用该激光器作为感染锁定系统的主激光器，实现了高功率激光器的相干性和频率稳定性的改进。开发了光学频率梳发生器来生成中频信号。即，通过使用安装在法布里-珀罗腔中的电光调制器来调制主激光器，实现了超过4 THz频率跨度的调制边带。通过将1.5 um波长的半导体激光和1.0 um波长的YAG激光照射到310°C的铌酸锂晶体上，产生这些激光器之间的和频信号。其波长和功率分别为0.63 um和0.7 uW。通过将该信号与频率稳定的 Hi-Ne 激光混合来实现光学锁相。相位误差方差降低至0.05弧度^2，从而证实了稳定的零差光学相位锁定。通过上述结果，在使用氦氖激光器的主频率标准和使用1.5 um波长的窄线宽半导体激光器的次级频率标准之间实现了频率测量系统的频率链。此外，还开发了光学频率梳发生器来连接二次频率标准和被测激光器。测频精度预计高达1 x 10^<-10>，证实了光学测频精度最高。作为现有光学测频系统的应用，以0.65 um波长的钙谱线为频率标准，以9个半导体激光器为从振荡器，提出了一种适用于0.6~1.3 um波长的新型频率链。对该系统的二次谐波和和频产生进行了实验。较少的

项目成果

W.WANG,K.NAKAGAWA,Y.TODA and M.OHTSU: "1.5um Diode Laser-based nonlinear Frequency Conversions by using Potassium Titanyl Phosphate" Appl.Phys.Lett.61. 1886-1888 (1992)

W.WANG、K.NAKAGAWA、Y.TODA 和 M.OHTSU：“使用磷酸钛氧钾进行基于 1.5um 二极管激光的非线性频率转换”Appl.Phys.Lett.61。

K. Nakagawa, M. Teshima and M. Ohtsu: "Infection Locking of a Highly Coherentand High-power Diode Laser at 1.5um" Opt.Lett.Vol. 16[20. 1590-1592 (1991)

K. Nakakawa、M. Teshima 和 M. Ohtsu：“1.5um 高度相干高功率二极管激光器的感染锁定”Opt.Lett.Vol。

W. Wang, K. Nakagawa, Y. Toda and M. Ohtsu: "1.5nm Diode Laser-based nonlinear Frequency Conversions by using Potassium Titanyl Phosphate" Appl.Phys.Lett.Vol.61[16. 1886-1888 (1992)

W. Wang、K. Nakakawa、Y. Toda 和 M. Ohtsu：“使用磷酸钛氧钾进行基于 1.5nm 二极管激光的非线性频率转换”Appl.Phys.Lett.Vol.61[16。

C.-H.Shin and M.Ohtsu: "Homodyne Optical Phase-Locking of Resonant Cavity Coupled Semiconductor Lasers" IEEE Journal of Quantum Electronics.

C.-H.Shin 和 M.Ohtsu：“谐振腔耦合半导体激光器的零差光学锁相”IEEE 量子电子杂志。

M. Kozuma, M. Kourogi and M. Ohtsu: "Frequency Stabilization. Linewidth reduction, and fine Detuning of a Semiconductor Laser by Using Velocity-Selective Optical Pumping of Atomic Resonance line" Appl.Phys.Lett.Vol.61[16. 1895-1897 (1992)

M. Kozuma、M. Kourogi 和 M. Ohtsu：“通过使用原子共振线的速度选择性光学泵浦实现半导体激光器的频率稳定、线宽减小和精细失谐”Appl.Phys.Lett.Vol.61[16。