Passively Q-Switched Pulses Generation from Erbium-Doped Fiber Laser Using Lutetium Oxide as Saturable Absorber

N A Mohamed,S W Harun,B A Hamida,T Eltaif,A A A Jafry

doi:10.1590/2179-10742021v20i11034

Abstract

Abstract In this paper, a configuration of a passive Q-switched Erbium-doped fiber laser (EDFL) using a Lutetium Oxide (Lu2O3) thin film as a saturable absorber (SA) is experimentally implemented to generate high pulse energy with a high signal to noise ratio. A stable Q-switched pulse train is initiated at the input pump power of 30.442mW, and a maximum pulse energy of 16.11 nJ is obtained at an output power of 0.97 mW, which confirms the stability of the pulses. It was possible to increase the repetition rate of the Q-switched laser from 31.25 to 60.2 kHz as the pump power was raised from 30.442 mW to 71.652 mW. Moreover, the pulse width decreased from 11.4 µs to 4.27 µs and 66.4 dB of the received signal-to-noise ratio at the radio frequency spectrum was achieved.

Highlights

Fiber laser applications have opened numerous new implementations, and it has become easier and more compatible to use and design the laser
As the laser pump tuned to a certain pump power value, the electron inside the material can no longer makes a transition between the two energy states, it releases the light in the form of optical pulse (Q-switching generation)
The laser’s output wavelength change is monitored by the OSA device and as it’s shown in Fig. 3, the wavelength changed from 1566.7 nm to 1563.7 nm at the pumping power of 30.442 Max Output Power (mW), when the cavity has the saturable absorber added to it. This change in the wavelength is due to the loss increment in the cavity, the laser will emit lower wavelengths, having a greater gain to compensate for the losses

Summary

Introduction

Fiber laser applications have opened numerous new implementations, and it has become easier and more compatible to use and design the laser. Since the doped fiber has a longer period of usability compared to a standard laser resonator, it is possible to achieve a greater gain and a greater power output [2]. Because of the high output power and flexibility in usage and design, practical applications requiring. Erbium-doped fiber (EDF) as a gain medium in the cavity have increased substantially in recent years. Due to its capabilities in fiber sensor applications and optical communication, many scholars use EDF as their gain medium [3] – [4]. Researchers have gained interest in Q-Switched fiber lasers acquired using docile techniques, because they are easy to generate and more solid in setup.

Methods

Results

Conclusion