Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
WAVELENGTH-SWEPT LIGHT SOURCE, METHOD FOR GENERATING DRIVE DATA FOR WAVELENGTH-SWEPT LIGHT SOURCE, AND OPTICAL DEFLECTOR
Document Type and Number:
WIPO Patent Application WO/2018/105549
Kind Code:
A1
Abstract:
The present invention address the problem of an SS-OCT device that, while the intensity of an interference signal increases as the coherence length of light from a wavelength-swept light source becomes longer, it has been difficult to maintain a long coherence length state over an entire wavelength band for wavelength-sweeping in the case of a conventional wavelength-swept light source in which temporally constant current injection is performed with respect to a gain medium, resulting in a decrease in the PSF intensity which directly impacts the quality of an output image from the SS-OCT device. In a wavelength-swept light source according to the present invention, a long coherence length state of output light is maintained over an entire swept-wavelength band. In correspondence to the wavelength-sweeping, the gain of the gain medium is varied over time and is maintained in a maximum coherence length state. Over the entire swept-wavelength band, the gain of the gain medium is maintained in a near-oscillation threshold state to narrow the unsaturated gain bandwidth of the gain medium. Also disclosed are an SOA current wavelength data acquisition method for driving while maintaining a long coherence length state, a novel coherence length measuring method, and an optical deflector suitable for a wavelength-swept light source.

More Like This:
JPH05316044METHOD FOR CONTROLLING WAVELENGTH OF LASER DIODE FOR OPTICAL TRANSMISSION SYSTEM USING HIGH SENSITIVITY RECEPTION PANEL BY OPTICAL PREAMPLIFIER
JP3875856VARIABLE WAVELENGTH OPTICAL SOURCE AND WAVELENGTH VARYING METHOD
JPH07114022[Title of the Invention] High-frequency superimposition operation confirmation circuit for laser
Inventors:
UENO MASAHIRO (JP)
CHIN MEISHIN (JP)
TATSUMI SHOKO (JP)
SAKAMOTO TAKASHI (JP)
SASAKI YUZO (JP)
TOYODA SEIJI (JP)
AKAGE YUICHI (JP)
YAMAGUCHI JOJI (JP)
SAKAMOTO TADASHI (JP)
Application Number:
PCT/JP2017/043446
Publication Date:
June 14, 2018
Filing Date:
December 04, 2017
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H01S5/06; G01J9/00; H01S3/106; H01S3/131; H01S5/14
Foreign References:
JP2015142111A2015-08-03
JP2010175271A2010-08-12
JP2007115900A2007-05-10
JP2014042010A2014-03-06
JP2016032608A2016-03-10
JP2008529068A2008-07-31
JPS59207756A1984-11-24
JP2003023198A2003-01-24
JP2007109923A2007-04-26
JP2009198593A2009-09-03
JP2010062426A2010-03-18
JP2012151419A2012-08-09
JP2014126599A2014-07-07
US20150373431A12015-12-24
US20080037608A12008-02-14
JP2005347668A2005-12-15
JP2011186218A2011-09-22
JP2015142111A2015-08-03
Other References:
YOSHIAKI YASUNO ET AL.: "Three-dimensional and high-speed swept-source optical coherence tomography for in vivo investigation of human anterior eye segments", OPTICS EXPRESS, vol. 13, no. 26, 2005, pages 10652 - 10664, XP055506441, DOI: doi:10.1364/OPEX.13.010652
See also references of EP 3553903A4
Attorney, Agent or Firm:
TANI & ABE, P.C. (JP)
Download PDF:
View/Download PDF      PDF Help



 
Previous Patent: ARC WELDING METHOD AND ARC WELDING DEVICE

Next Patent: AMYOTROPHY INHIBITING COMPOSITION