Simple method to tune the pulse-width for a single-mode Q-switched YAG oscillator

1996 ◽  
Author(s):  
Weiming He ◽  
Zhiwei Lu ◽  
Qi Wan ◽  
Zuguang Ma
Keyword(s):  
Pulse Width ◽  
Single Mode ◽  
Simple Method

A Simple Method for Prediction of Effective Core Area and Index of Refraction of Single-mode Graded Index Fiber in the Low V Region

2014 ◽  
Vol 35 (4) ◽  
Author(s):  
Angshuman Majumdar ◽  
Satabdi Das ◽  
Sankar Gangopadhyay
Keyword(s):  
Refractive Index ◽  
Single Mode ◽  
Index Of Refraction ◽  
Core Area ◽  
Exact Results ◽  
Simple Method ◽  
Graded Index ◽  
Core Areas ◽  
V Region ◽  
User Friendly

AbstractBased on the simple power series formulation of fundamental mode developed by Chebyshev formalism in the low V region, we prescribe analytical expression for effective core area of graded index fiber. Taking step and parabolic index fibers as examples, we estimate the effective core areas as well as effective refractive index for different normalized frequencies (V number) having low values. We also show that our estimations match excellently with the available exact results. The concerned predictions by our method require little computation. Thus, this simple but accurate formalism will be user friendly for the system engineers.

Fusion Splicing Holey Fibers and Single-Mode Fibers: A Simple Method to Reduce Loss and Increase Strength

2009 ◽  
Vol 21 (3) ◽  
pp. 164-166 ◽  
Author(s):  
M. Tse ◽  
H.Y. Tam ◽  
L.B. Fu ◽  
B.K. Thomas ◽  
L. Dong ◽  
...  
Keyword(s):  
Single Mode ◽  
Simple Method

Characterization of semiconductor laser frequency chirp based on signal distortion in dispersive optical fiber

2006 ◽  
Vol 14 (2) ◽  
Author(s):  
P. Krehlik
Keyword(s):  
Single Mode ◽  
Laser Frequency ◽  
Single Mode Fiber ◽  
Distributed Feedback ◽  
Parameters Estimation ◽  
Signal Distortion ◽  
Measuring Time ◽  
Simple Method ◽  
Laser Chirp

AbstractIn the paper, the simple method of laser chirp parameters estimation is presented. It is based on measuring time-domain distortions of chirped signal transmitted through dispersive fiber and finding laser chirp parameters by matching measured distortions to calculated ones. Experiments undertaken with 1.55 μm telecommunication grade distributed feedback (DFB) lasers and standard single-mode fiber are described, together with some practical remarks on measurement setup and main conclusions.

scholarly journals All-fiber passively mode-locked femtosecond fiber lasers

2021 ◽  
Author(s):  
Jiaqi Zhou
Keyword(s):  
Fiber Laser ◽  
Pulse Energy ◽  
Pulse Width ◽  
Fiber Lasers ◽  
High Efficiency ◽  
Single Mode ◽  
Scaling Up ◽  
Mode Locking ◽  
Raman Signal ◽  
Loop Mirror

This dissertation presents three all-fiber designs of passively mode-locked lasers in order to achieve high pulse energy, environmentally-stable dissipative soliton (DS) operation in all-normal-dispersion cavities. A numerical model for DS mode-locked fiber lasers based on the nonlinear Schrodinger equation has been used to guide the experimental designs. Firstly, an environmentally-stable and ultra-compact SESAM mode-locked fiber laser is demonstrated. The all-fiber design is realized using a mode-field-adaptor (MFA) to couple light onto the SESAM. A polarization-maintaining fiber loop mirror serves multiple functions as a highly reflective mirror, an output coupler and polarization selector. Self-starting and stable DS mode-locking operation is achieved with 1.7 nJ pulse energy and a 22 ps pulse width. Secondly, an ultra-stable DS mode-locking was demonstrated in a long cavity ring laser with a nonlinear amplified loop mirror (NALM) as a mode-locking device. The output pulses of 32 nJ, 615 fs de-chirped pulse width were obtained with the Raman signal suppressed below -20 dB in a 81 m long cavity. The mode-locking is self-starting and the mode-locked pulse train shows excellent stability. Thirdly, the mode-laser cavity was extended with a piece of large-mode-area (LMA) fiber with a low dispersion to further scaling up the pulse energy to 56.8 nJ. The laser pulses were compressed to 750 fs by a pair of volume gratings. In the processing of scaling-up the pulse energy of the NALM mode-locked fiber laser, some interesting physical phenomena were observed, such as the operation regime transition from noise-like to DS with a sudden reduction of Raman signal and a unique waves-splitting with a stable temporal spacing. The phenomena were studied and explained in this dissertation. In addition to the mode-locked fiber laser, a CW and a Q-switched fiber lasers were also designed with a single-mode- multimode- single-mode (SMS) filter as an effective mean of overcoming nonlinear effects. The transmission spectral property of the SMS was studied which fits well with theoretical calculation. One high efficiency SMS CW fiber lasers and one SMS Q-switched fiber laser were designed which showed the effectiveness of the SMS filter for inhibiting the SRS and significantly reducing SPM.

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