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. 2008 Feb 18;16(4):2547-54.
doi: 10.1364/oe.16.002547.

High-speed and wide bandwidth Fourier domain mode-locked wavelength swept laser with multiple SOAs

Min Yong Jeon  1 , Jun Zhang, Qiang Wang, Zhongping Chen
Affiliations

High-speed and wide bandwidth Fourier domain mode-locked wavelength swept laser with multiple SOAs

Min Yong Jeon et al. Opt Express. .

Abstract

We report on the development of a high-speed, wide bandwidth Fourier domain mode-locked (FDML) wavelength swept laser of around 1300 nm using two gain media for high-resolution and high-speed Fourier domain optical coherence tomography. The wavelength swept laser is capable of FWHM scanning range of more than 135 nm at 45.6 kHz sweeping rate. The measured axial resolution of the forward scan is 6.6 microm in air and 4.7 microm in tissue. The peak power is 11.4 mW for both the forward and backward scans. The measured system sensitivity is achieved up to 100.7 dB. We also demonstrate OCT imaging using the FDML wavelength swept laser with two semiconductor optical amplifiers.

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Figures

Fig. 1
Fig. 1
Experimental setup for a wide-bandwidth, high-speed of a FDML wavelength swept laser and an SSOCT system. (PC: polarization controller; FC: fiber coupler; OC: optical circulator; SOA: semiconductor optical amplifier; Coll.: collimator)
Fig. 2
Fig. 2
ASE spectrum of two SOAs used in a FDML wavelength swept laser.
Fig. 3
Fig. 3
Optical spectra and transient intensity profiles : (a) optical spectrum of laser cavity 1 and its transient intensity profile (b); (c) optical spectrum of laser cavity 2 and its transient. intensity profile (d); (e) optical spectrum of combined laser cavity and its transient intensity profile (f).
Fig. 4
Fig. 4
Forward scan point spread function (PSF) of the FDML laser system: (a) axial resolution and (b) axial resolution as a function of depth.
Fig. 5
Fig. 5
Sensitivity of the FDML laser system as a function of depth.
Fig. 6
Fig. 6
OCT images of (a) human finger and (b) nail fold in vivo with FDML wavelength swept laser at 45.6 kHz sweep rate.
See this image and copyright information in PMC

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