Power-Scalable, Sub-Nanosecond Mode-Locked Erbium-Doped Fiber Laser Based on a Frequency-Shifted-Feedback Ring Cavity Incorporating a Narrow Bandpass Filter

Abstract

We present an all-fiberized power-scalable, sub-nanosecond mode-locked laser based on a frequencyshifted-feedback ring cavity comprised of an erbium-doped fiber, a downshifting acousto-optic modulator (AOM), and a bandpass filter (BPF). With the aid of the frequency-shifted feedback mechanism provided by the AOM and the narrow filter bandwidth of 0.45 nm, we generate self-starting, mode-locked optical pulses with a spectral bandwidth of ~0.098 nm and a pulsewidth of 432 to 536 ps. In particular, the output power is readily scalable with pump power while keeping the temporal shape and spectral bandwidth. This is obtained via the consolidation of bound pulse modes circulating at the fundamental repetition rate of the cavity. In fact, the consolidated pulses form a single-entity envelope of asymmetric Gaussian shape where no discrete internal pulses are perceived. This result highlights that the inclusion of the narrow BPF into the cavity is crucial to achieving the consolidated pulses.

Current Status and Prospects of High-Power Fiber Laser Technology (Invited Paper)

“…레이저의 출력 수준이 상승하고, 빔 품질이 향상됨에 따라 레이저는 통신, 정밀 측 정, 바이오, 의료에서부터 대형 구조물의 드릴링, 용접, 절단, 또한, 국방에 이르기까지 폭넓은 분야에서 중추적인 기술 요 소로 자리 매김을 하고 있다 [1][2][3][4][5][6][7][8] . 레이저 시스템은 다양한 방 식으로 구성될 수 있는데, 최근에는 광섬유를 이득 매질로 하는 광섬유 레이저가 벌크(Bulk) 방식 레이저 시스템과 대 비되는 다양한 장점에 힘입어 많은 연구 및 개발 관심을 받 고 있다 [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] . [11] .…”

Influence of Diverse Atmospheric Conditions on Optical Properties of a Pulse Laser in a Time-of-Flight Laser Range Finder

“…In the TOF-LRF system, the distance to the target is determined by measuring round trip time after propagating a pulse laser through air [1]. In the TOF-LRF system, a pulse laser with short pulse width can dramatically improve the measurement resolution of distance [2][3][4][5]. Recently, a femtosecond laser was implemented for the precise measurement of distance in the TOF-LRF system to effectively improve the resolution [6,7].…”