1,720,992 research outputs found
Numerical simulation of self starting of a modelocked laser with a nonlinear mirror based on second harmonic generation
No full textA simple computer model of modelocking using an intracavity nonlinear mirror based on second harmonic generation has been constructed. Saturation of the gain medium is included. The model exhibits experimentally observed features such as a second harmonic conversion efficiency threshold before modelocking occurs. Self Q-switching and modelocking occurs for sufficiently large values of fluorescence lifetime. The model predicts that there is a narrow region above the modelocking threshold which allows steady state modelocking to occur even in long fluorescence lifetime materials
Modelocking using mirrors with intensity dependant reflection coefficients
No full textThe steady state modelocking of a laser incorporating a mirror with an intensity dependent reflection coefficient is analysed The pulse length is determined by the balance between pulse stretching due to gain narrowing and pulse shortening due to the nonlinear mirror. The final pulse length can approach the limit set by the gain bandwidth of the active medium
Enhancement of the modulation depth of an active modelocker using an external cavity
No full textAn external cavity containing a standard active modelocker can result in enhanced modelocking of lasers. The pulse length reduction depends on the configuration chosen and can be as large as 50%
Coupled cavity modelocking using nonlinear amplitude modulators
No full textA straightforward analysis of the process by which nonlinear amplitude modulators in coupled cavities can lead to enhanced mode-locking is presented. The application of the theory is demonstrated by using second-harmonic generation in an external cavity to mode-lock a Nd:YAG laser yielding 30 ps pulses in a Q-switched and mode-locked pulse train
Laser diode pumped solid state lasers
No full textSolid state lasers have undergone a renaissance since the development of reliable and cheap laser diodes which can be used as pump sources. The result is compact, efficient laser sources which are attractive for a wide range of applications. This review summarizes the properties of laser diodes which are advantageous for pumping solid state lasers and describes the diverse laser materials and configurations of solid state lasers reported in the literature
Coupled cavity modelocking of a Nd:YAG laser using second harmonic generation
No full textThe modelocking of a Nd:YAG laser using second-harmonic generation in an external cavity as the only pulse shortening process is reported. The output of a long pulse Nd:YAG laser was simultaneously modelocked and Q-switched. The average pulse duration was 30-50 ps and the peak power was in the range 60-160 kW
Single shot measurements of pulse duration for a picosecond pulse at 249nm
No full textWe report the first demonstration and give experimental details of a technique for measuring the pulse temporal profile of a single picosecond pulse at a wavelength of 249 nm
Actively modelocked laser diode pumped Nd:glass lasers
No full textThe mode-locked Nd:glass laser is a well-known source of short pulses due to its large fluorescence Iinewidth (5.3 THz). Traditionally, this laser has been pumped using flashlamp excitation or end pumping using an argon ion laser operating at 514 nml. More recently, the development of diode laser technology has lead to the use of diode lasers as pump sources for actively modelocked neodymium-doped solid state lasers, including the Nd:glass laser. The Nd:glass laser is particularly suitable for pumping with laser diodes due to its wide absorption linewidth in the region of 800 nm. We have investigated both acousto-optic amplitude modulation (AM) mode-locking and electro-optic frequency modulation (FM) mode-locking of the laser-diode-pumped Nd:glass laser
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