Evaluation of a swept-laser optical coherence tomography light source based on a novel quantum-dot based semiconductor optical amplifier

Evaluation of a swept-laser optical coherence tomography light source based on a novel quantum-dot based semiconductor optical amplifier
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基于新型量子点半导体光放大器的扫频激光光学相干断层扫描光源的评估

DOI:
10.1117/12.889247
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发表时间:
2011
期刊:
--
影响因子:
--
通讯作者:
Krstajic N
Krstajic N
中科院分区:
--
文献类型:
--
作者:
Krstajic N

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我们描述了一个简单的扫描激光器的设计,其特征在于发射带宽,线宽,光谱形状和输出噪声。使用短腔Littmann配置,其中半导体光放大器(SOA)激射波长由具有每mm 830个凹槽的衍射光栅的检流计调谐。3dB耦合器从由光栅和端镜形成的腔中提取光,并且光输出用于照射平衡扫频源光学相干断层扫描(SS-OCT)干涉仪,该干涉仪包括环行器、3dB耦合器、色散补偿器和平衡检测器。SOA(SOA-1200-70-PM-20 sB,InnolectiveGmbH)使用新颖的III-V族半导体量子点增益介质。在700 mA的驱动电流下,ASE在1150 nm和1300 nm之间发射。当用于Littmann腔激光器时,产生约10 mm的相干长度,其可调谐超过60 nm。最大输出功率为12 mW。扫频激光器已被纳入基于光纤的SS-OCT系统,并用于生物组织成像。空气中的轴向分辨率为12微米。人体手掌皮肤在体内的图像证明,显示出良好的分辨率和对比度,与角质层,表皮,网脊和表皮真皮交界可视化。
We describe a simple swept-laser design that characterizes the emission bandwidth, linewidth, spectral shape and output noise. A short cavity Littmann configuration is used in which the semiconductor optical amplifier (SOA) lasing wavelength is tuned by a galvanometer with an 830 grooves per mm diffraction grating. A 3dB coupler extracts light from the cavity formed by the grating and end-mirror and the optical output uses to illuminate a balanced swept source optical coherence tomography (SS-OCT) interferometer incorporating a circulator, 3dB coupler, dispersion compensator and balanced detector. The SOA (SOA-1200-70-PM-20sB, Innolume GmbH) uses a novel III-V semiconductor quantum-dot gain medium. ASE is emitted between 1150nm and 1300nm at a drive current of 700mA. When used in the Littmann cavity laser a coherence length of about 10mm is produced, which is tunable over 60nm. The peak output power is 12mW. The swept-laser has been incorporated into a fiber-based SS-OCT system and used to image biological tissues. Axial resolution in air is 12 microns. Images of human palmar skin in-vivo are demonstrated, showing good resolution and contrast, with the stratum corneum, epidermis, rete ridges and epidermal-dermal junction visualized.
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