Solitons in Laser Systems with Saturable Absorption

Design and Synthesis of New Acceptor Molecules for Photo-Induced Electron Transfer Reverse Saturable Absorption

MRS Proceedings ◽

10.1557/proc-598-bb4.8 ◽

1999 ◽

Vol 598 ◽

Author(s):

M. Bader ◽

J. Moser ◽

H. Li ◽

S. Tarter ◽

C. Spangler

Keyword(s):

Cross Sections ◽

Excited State Absorption ◽

Optical Power ◽

Laser Frequency ◽

Saturable Absorption ◽

Reverse Saturable Absorption ◽

Incident Wavelength ◽

Limiting Behavior ◽

Design And Synthesis ◽

Laser Systems

ABSTRACTWith the advent of efficient and relatively inexpensive pulsed and CW laser systems for both civilian and military applications, the need for adequate eye and sensor protection is becoming increasingly important. While it is possible to filter out harmful wavelengths if the laser frequency is known, the proliferation of frequency agile laser sources underscores the need for “smart” passive materials that can sense the incident wavelength and provide protection. There has been considerable progress made in recent years in the design of optical power limiting (OPL) materials that can function by a variety of mechanisms, most of which derive their limiting behavior from some type of nonlinear absorption process. The most well-studied of these processes involve excited state absorption in which the absorption cross-sections of the photo-generated transient species are much greater than the original S0 to S1 transition. In this presentation we will discuss the efficacy of charge transfer species for optical limiting, and the need for more and better electron acceptor species.

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Saturable absorption and its consequent effects in bistable erbium‐doped fiber ring laser

Journal of Optics ◽

10.1088/2040-8986/ac41d6 ◽

2021 ◽

Author(s):

Deeksha Jachpure ◽

Ramarao Vijaya

Keyword(s):

Ring Laser ◽

Optical Bistability ◽

Laser Cavity ◽

Gain Medium ◽

Saturable Absorption ◽

Fiber Ring Laser ◽

Fiber Ring ◽

Linear Absorption ◽

Erbium Doped ◽

Laser Systems

Abstract The linear absorption in erbium-doped fiber contributes to its excellent role in erbium-doped fiber amplifiers and lasers. A nonlinear optical contribution in the absorption of erbium-doped fiber is responsible for optical bistable action when it is present in a laser cavity. To quantify this effect, the variation of absorption coefficient is measured at different signal powers at multiple wavelengths in the C-band for different EDF lengths, and saturable absorption parameters such as the saturation power are extracted. Then the modification in the output characteristics of erbium-doped fiber ring laser with change in fiber length and in the presence of self-induced saturable absorption effect within the gain medium which leads to optical bistability is measured. By comparing the measured parameters obtained from saturable absorption in erbium-doped fiber and optical bistability in erbium-doped fiber ring laser, we estimated the length of the gain medium which acts as the saturable absorber inside the cavity of the laser. This is useful in constructing bistable lasers with optimized conditions. The temporal evolution of cavity loss and gain with the intra-cavity power and up- and down-thresholds helps in understanding why the down-threshold will be lesser than the up-threshold in bistable laser systems.

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