Simultaneous dual-wavelength-band common-path swept-source optical coherence tomography with single polygon mirror scanner

Simultaneous Dual-Band Wavelength-Swept Fiber Laser Based on Active Mode Locking

“…For this experiment, a perfectly synchronized dual-band wavelengthswept laser was easily obtained due to simple operation using the single modulation signal. In addition, because the final output of the dual-band laser source comes out from a single output port, it is not necessary to employ additional effort to combine two beams of dual bands into one position [11], [13]. As we reported previously [5], at the high repetition rate, the instantaneous linewidth become broader due to the respectively long cavity length of DCF cavity media.…”

“…Specially, dual-wavelength lasers have been widely developed for differential absorption light detection and ranging (LIDAR) [7], [8], microwave generation [9], [10] and spectroscopic dual-band OCT imaging [11]- [13]. Many different kinds of dual-band lasers have been proposed, but most of their schemes consist of two gain regions and a wavelength-selecting filter in the laser cavity [11]- [13].…”

“…Many different kinds of dual-band lasers have been proposed, but most of their schemes consist of two gain regions and a wavelength-selecting filter in the laser cavity [11]- [13]. For example, in the case of a dual-band wavelength-swept FDML fiber laser, the FFP-TF is inserted into the cavity to sweep each wavelength-band [11], [12].…”

“…It is not easy to tune a dual channel driver for the two FFP-TFs for simultaneous oscillation in the ring cavities of both bands [11]. In the case of a dual-band wavelength-swept source based on a polygon mirror scanning filter, two narrowband intra-cavity wavelength filters with a single high-speed polygonal scanner have been used [13]. However, these mechanical filter causes disadvantages, such as high cost, limited stability and bulk volume, needed to tune the center wavelength.…”

Simultaneous multi-wavelength-band optical frequency domain imaging for spectroscopic investigations

“…As a proof concept prototype, a dual-band OFDI system is constructed [17]. The dual-band swept source comprises two extended ring cavity semiconductor lasers and two narrowband intracavity wavelength filters with a single high-speed polygonal scanner.…”