Development of a pulsed fiber laser for ladar system

Dülgergil, Ebru
In recent years laser technology has increasingly developed with the use of fiber lasers and this has provided the possibility to implement different techniques in the defense industry. LADAR is at the forefront of these techniques. Fiber lasers constitute a perfect source for LADAR systems due to their excellent robustness, compact size and high-power generation capability. In this study we will explore the development of a pulsed fiber laser source for a LADAR system that can obtain high resolution 3D images in eye-safe region. A high power, all fiber integrated erbium system with strictly single mode operation in eye-safe region based on MOPA (master oscillator power amplifier) configuration with seed source and amplifier part was developed. Both the use of an actively mode locked laser with erbium doped fiber and fiber coupled modulated distributed feedback diode laser were investigated as seed sources for the amplifier part. Both erbium doped single clad fiber and erbium-ytterbium doped double clad gain fiber were used in this amplifier system. After amplification of the actively mode locked laser, 12 W of average optical power was obtained through single mode fiber with 1ns pulse duration at 10 MHz which corresponds to 1.2 kW peak power. For the fiber coupled DFB diode laser, 9.5W average power was obtained with around 8 ns duration pulses at 100 kHz and about 9.2 W average power was also obtained with around 700 ps duration pulses at 1 MHz through strictly single mode fiber at the output of the same amplifier system as was used in the actively mode locked seed source. In both cases calculated peak power was around 10 kW v which is estimated as the highest peak power for an all fiber integrated system with single mode operation. The development of such a fiber system with high power capability, compact size and free of misalignment is expected to be useful for LADAR application as well as other areas such as eye


Development of a picosecond pulsed mode-locked fiber laser
Yağcı, Mahmut Emre; Altan, Hakan; Department of Physics (2013)
Fiber lasers represent the state-of-the-art in laser technology and hold great promise for a wide range of applications because they have a minimum of exposed optical interfaces, very high efficiency, and are capable of exceptional beam quality. In the near future, the most important markets such as micromachining, automotive, biomedical and military applications will begin to use this technology. The scope of this thesis is to design and develop a short picosecond pulsed fiber laser using rare-earth doped ...
Development of a rapid-scan fiber-integrated terahertz spectrometer
Keskin, Hakan; Altan, Hakan; Yavas, Seydi; İLDAY, Fatih Ömer; Eken, Koray; ŞAHİN, ASAF BEHZAT (2014-04-01)
Scientists in terahertz (THz) wave technologies have benefited from the recent developments in ultrafast laser technologies and RF technologies and applied these new gained techniques into characterizing a wide variety of phenomena. Undoubtedly, the most successful of these applications has been in the development of time-domain terahertz spectroscopic and imaging systems which has been utilized in the characterization of dielectrics and semiconductors. This pulsed technique has allowed users to characteriz...
Application of pulsed laser deposition and laser-induced ion implantation for formation of semiconductor nano-crystallites
This work describes the application of laser ion source (LIS) for fabrication of semiconductor nanostructures, as well as relevant equipment completed and tested in the IPPLM for the EU STREP "SEMINANO" project and the obtained experimental results. A repetitive Pulse laser system of parameters: energy of similar to 0.8 J in a 3.5 ns-pulse, wavelength of 1.06 mu m, repetition rate of up to 10 Hz and intensity on the target of up to 10(11) W/cm(2), has been employed to produce Ge ions intended for ion implan...
Design, modeling and control of 4-axis electro-optical director for high energy laser application
Mavuş, Ahmet; Balkan, Raif Tuna; Department of Mechanical Engineering (2019)
With the development of laser technology, high power applications increasingly play significant roles in industry, military, and communication fields. Thus, handling large payloads, precisely steering laser beams comes into prominence. Achieving appropriate stiffness in mechanical design, optimal actuator and sensor selection, successful control strategy, and elaborative testing are factors involved in determining the system performance. In this study, firstly, a thorough literature review is conducted. Nex...
Power stabilization of diode pumped solid state lasers by means of adaptive control of drive current
Şentürk, Tayfun; Leblebicioğlu, Mehmet Kemal; Department of Electrical and Electronics Engineering (2019)
Lasers provide precision and sensitivity for various applications. However, some fundamental properties make lasers very susceptible to external changes. When stability of laser parameters is required the traditional approach is to stabilize the working environment, such as strict temperature and climate control, mechanical isolation as well as damping of any vibration. This traditional approach is very difficult to implement in harsh industrial environments and almost impossible for many military applicati...
Citation Formats
E. Dülgergil, “Development of a pulsed fiber laser for ladar system,” M.S. - Master of Science, Middle East Technical University, 2012.