High speed strain measurement of active mode locking FBG laser sensor using chirped FBG cavity

2017 ◽  
Author(s):  
Gyeong Hun Kim ◽  
Joon Young Kim ◽  
Chang Hyun Park ◽  
Chang-Seok Kim ◽  
Hwi Don Lee ◽  
...  
Keyword(s):  
Strain Measurement ◽  
High Speed ◽  
Mode Locking ◽  
Laser Sensor ◽  
Active Mode

Optimization of interferometric sensing heads for active mode locking laser sensor

2018 ◽  
Author(s):  
Chang Hyun Park ◽  
Gyeong Hun Kim ◽  
Hwi Don Lee ◽  
Minsik Jo ◽  
Chang-Seok Kim
Keyword(s):  
Mode Locking ◽  
Laser Sensor ◽  
Active Mode

Active mode-locking of an external cavity GaInAsP laser incorporating a fibre-grating reflector

1988 ◽  
Vol 24 (23) ◽  
pp. 1439 ◽  
Author(s):  
D. Burns ◽  
D.W. Crust ◽  
J.T.K. Chang ◽  
W. Sibbett
Keyword(s):  
External Cavity ◽  
Mode Locking ◽  
Active Mode

scholarly journals Dual-band wavelength-swept active mode locking laser for multi-band fiber-optic sensors

2012 ◽  
Author(s):  
Hwi Don Lee ◽  
Chang Seok Kim ◽  
Myung Young Jeong ◽  
Zhongping Chen
Keyword(s):  
Fiber Optic ◽  
Mode Locking ◽  
Fiber Optic Sensors ◽  
Dual Band ◽  
Active Mode ◽  
Multi Band

Phase characteristics of pulses from an Nd : YAG laser with active mode locking

1997 ◽  
Vol 27 (11) ◽  
pp. 968-971
Author(s):  
A A Apolonskii ◽  
V P Drachev ◽  
Yu I Krasnikov ◽  
S V Perminov
Keyword(s):  
Mode Locking ◽  
Yag Laser ◽  
Active Mode

Active mode-locking of conventional diode laser by using external cavity

1990 ◽  
Vol 78 (5-6) ◽  
pp. 369-372 ◽  
Author(s):  
Hiroki Nakatsuka ◽  
Kazi Monowar Abedin ◽  
Sadao Uemura
Keyword(s):  
Diode Laser ◽  
External Cavity ◽  
Mode Locking ◽  
Active Mode

scholarly journals Phase stable swept-source optical coherence tomography with active mode-locking laser for contrast enhancements of retinal angiography

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kwan Seob Park ◽  
Eunwoo Park ◽  
Hwidon Lee ◽  
Hyun-Ji Lee ◽  
Sang-Won Lee ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Phase Stability ◽  
Averaging Method ◽  
Mode Locking ◽  
Optical Coherence ◽  
Swept Source ◽  
Active Mode ◽  
Coherent Averaging ◽  
Noise Ratio ◽  
High Phase

AbstractSwept-source optical coherence tomography (SS-OCT) is an attractive high-speed imaging technique for retinal angiography. However, conventional swept lasers vary the cavity length of the laser mechanically to tune the output wavelength. This causes sweep-timing jitter and hence low phase stability in OCT angiography. Here, we improve an earlier phase-stabilized, akinetic, SS-OCT angiography (OCTA) method by introducing coherent averaging. We develop an active mode-locking (AML) laser as a high phase-stable akinetic swept source for the OCTA system. The phase stability of the improved system was analyzed, and the effects of coherent averaging were validated using a retina phantom. The effectiveness of the coherent averaging method was further confirmed by comparing coherently and conventionally averaged en face images of human retinal vasculature for their contrast-to-noise ratio, signal-to-noise ratio, and vasculature connectivity. The contrast-to-noise ratio was approximately 1.3 times larger when applying the coherent averaging method in the human retinal experiment. Our coherent averaging method with the high phase-stability AML laser source for OCTA provides a valuable tool for studying healthy and diseased retinas.

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