NakuLaser Blog

 The laser must have the above three parts, the pump source , the working material and the optical resonant cavity, and the laser using solid laser material as the working material. The working substance undergoes population inversion distribution under the action of the pump source and becomes an active substance, which has the effect of light amplification. Part of the amplified light is fed back to participate in excitation, and the resonant cavity oscillates, and laser light can be produced after certain conditions are met. 1. Pump source: its function is to give energy to the working substance, and to excite atoms from low energy level to high energy level of external energy. Usually there can be light energy, thermal energy, electric energy, chemical energy, etc. 2. Working substance: At the core of the laser, only the substance that can achieve energy level transition can be used as the working substance of the laser. 3. Optical resonant cavity: make the stimulated radiation...

Abstract : According to the special structure of fiber laser, different types of fiber laser pump sources  are proposed, and the criteria for selecting pump source and its corresponding efficiency are given. The main components of the laser are the resonant cavity, the pump source and the working substance. The pump source is the excitation source that causes the laser working medium to reach the population inversion. The process of particles from the ground state to the high energy level is called the pumping process. Common pumping methods include electric pumping, chemical pumping, optical pumping, and pneumatic pumping, while optical pumping and electric pumping are the most widely used methods. Gas lasers often use an electric pumping method as an excitation source, and optical pumping methods are widely used in solid and liquid lasers. Optical pumping uses a beam of light to illuminate the working substance so that the particles in the working substance absorb the energy...

Abstract: Erbium doped fiber amplifier was pumped by A l-free 980nm InGaAs/ InGaAsP/ InGaP high power quantum well laser.   At pump power of 20mW, the gain is 33dB, the maximum gain  coefficient is 6 . 7dB/ mW and the saturated output power is 6dBm. The gain is as a function of  fiber length and pump powers , it is also as a function of output powers. 1 Introduction With the deep development of optical communication technology, the development of erbium-doped fiber amplifier (EDFA) as a direct optical amplification technology has become the mainstream of today's research. EDFA has the compatibility of erbium-doped fiber and communication fiber, low coupling loss, good stability, high gain, high bandwidth, high efficiency, low noise, no polarization dependence, and simple structure. Due to its small size, easy to use and high practical value. Therefore, it is a key component for achieving all-optical fiber-optic communication, such as coherent optical communicatio...

Abstract : A double-pass bi-directional(DP_BD) pump configuration is proposed for the high efficiency L-band ASE. A L-band ASE of 13.7 dBm output power and 38nm bandwidth of 1566~1604 nm where the ASE power intensity is higher than -16 dBm is obtained by selecting 1480 nm LD and heavily doped erbium fiber with optimized length simultaneously. The DP-BD ASE source has a pump conversion efficiency of 23.4% which is larger than that by double-pass forward (DPF) configuration of 11.8%. Introduction Broadband light source  based on erbium-doped fiber amplifying spontaneous emission (ASE) is a new type of light source with erbium-doped fiber amplifier ( EDFA ). Since the first commercial use of EDFA for all-optical amplification in 1993 has led to the rapid development of optical communication, broadband light sources based on erbium-doped fiber ASE have the same output spectrum as the 1.55" m-band of optical communication, and have The output spectrum is stable, the environment ...

Abstract: A two-stage broadband erbium-doped fiber based amplified  spontaneous emission (ASE) source is presented. By using double pass configuration and recycling backward C band ASE, the pump power for L_band ASE generation is much economized. With achirped fiber Bragg grating (CFBG ) as spectrum equalizer, a flat spectral bandwidth of 76nm is realized. Introduction Incoherent amplified spontaneouse mission (ASE) source with low spectral ripple sare widely applied in various are as such as optical device characterization, optical sensor systems, spectrum sliced dense wavelength division multiplexing (DWDM) systems, fiber-optical gyroscopes and low-coherence tomography. Erbium-doped fiber(EDF) based ASE source sare optimal choice to realize simuha- neous C-band and L-band operation. Nevertheless, since L-band is far away from the gain peak (1530nm ) of sillca-base EDF, the gain coefficient in L-band is much lower than thatin C-band (approxim ate-1vbyafactorof1O). Thus high...