Le Gouët Julien, Venkatraman Dheera, Wong Franco N C, Shapiro Jeffrey H
Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. le
Opt Express. 2009 Sep 28;17(20):17874-87. doi: 10.1364/OE.17.017874.
We demonstrate that single-mode broadband amplified spontaneous parametric downconversion, combined with optical parametric amplification, can be used as a classical source of phase-sensitive cross-correlated beams. We first study the single spatial mode emission and the spectral brightness properties of the parametric fluorescence, produced in periodically poled MgO-doped lithium niobate. Using the same single-pass bulk-crystal configuration for a pulsed optical parametric amplifier, we achieve a gain of approximately 20 dB at an average pump power of 2W, and explain the pulse narrowing observed at the output of both parametric fluorescence and amplification in the regime of high gain. Combining these two nonlinear processes, we measured optical coherence tomography signals with standard InGaAs photodiodes, thus realizing the first classical interferometer based on amplified parametric fluorescence. The results suggest their utility for demonstrating phase-conjugate optical coherence tomography.
我们证明，单模宽带放大自发参量下转换与光学参量放大相结合，可作为相位敏感交叉关联光束的经典光源。我们首先研究了在周期性极化掺氧化镁铌酸锂中产生的参量荧光的单空间模式发射和光谱亮度特性。使用相同的单通块状晶体配置作为脉冲光学参量放大器，在平均泵浦功率为2W时，我们实现了约20dB的增益，并解释了在高增益状态下参量荧光和放大输出处观察到的脉冲变窄现象。结合这两个非线性过程，我们用标准的铟镓砷光电二极管测量了光学相干断层扫描信号，从而实现了基于放大参量荧光的首个经典干涉仪。结果表明它们在演示相位共轭光学相干断层扫描方面的实用性。
