Fiber Coupled Diode Laser -pumped lasers are the fastest growing and widely used new lasers in recent years. His development is inseparable from the development of semiconductor lasers. 1960 debut of the first ruby lasers. In 1962 the first homogeneous junction gallium arsenide semiconductor lasers came out. In 1963, Newman first proposed the use of semiconductor as a solid-state laser pump source concept. With the LD output power increasing, in 1968 Ross first realized the use of GaAs Fiber Coupled Diode Laser pumped Nd: YAG laser. For the first time in 1973, pulsed LD end-pumped Nd: YAG lasers were reported and pointed out the advantages of end-pumped pumping. Chesler and Singh give the theoretical model of the end-pumped laser in the multi-transverse mode and single transverse mode, and the theoretical pump threshold based on the assumption of uniform pump is basically consistent with the experimental results. In 1976, Nd: YAG lasers with ultra-luminous diodes were pumped at room temperature for continuous operation. Since the 1980s, semiconductor laser and its array of research work has made a major breakthrough, greatly promoted the solid-state laser devices, technology and application development, and led to a comprehensive revival of solid-state lasers. With the appearance of quantum well structure and the growth of crystal growth technology such as metal organic chemical vapor deposition (MOCVD) and molecular beam epitaxy (MBE), the threshold current of LD is obviously reduced, the conversion efficiency and output power are improved Significantly improved, single semiconductor laser array output power of 1W to 2W. A single LD continuous output power of 100mw to 200mw.90 years, the Fiber Coupled Diode Laser production technology and production process gradually mature, life, reliability has greatly improved, which DPL development and application of new progress is particularly prominent. 1992, the United States Laurent - Rivermore National Laboratory successfully developed kilowatt-class high-power diode-pumped lasers. In 1994, the US Department of Energy announced the approval of the "National Ignition Facility" program. 2001 Akiyama et al. Used a three-way side-pumped Nd: YAG laser to obtain a 5.4kW laser output with an electro-optical conversion efficiency of 22%. In 2002 the United States TRW company developed a 5.4kW output Fiber Coupled Diode Laser pumped Nd: YAG laser. In 2006 the United States Nordisk successfully achieved a 19kW laser output. In summary, DPL is the most dynamic and promising in solid-state lasers.
As the diode-pumped laser has the advantages of high power, high beam quality output, small thermal effect, high efficiency and compact device structure, it becomes the key device of information technology. Its wide range of applications, wide wavelength range, the speed of development are other types of lasers can not match.
At present, the field of diode-pumped solid-state lasers is very extensive, such as military, medical, industrial and other fields.
Conducted switch and its trigger source system as an ultra-fast high-power pulse source, with optical isolation, the application background is a weapon ignition device, can effectively resist electromagnetic interference and improve reliability; the same time, as an ultra-fast high-power pulse source, Interference and confrontation, and the corresponding technical areas.
A foreign research group used a complex optical system to obtain a number of linear current wires on the surface of GaAs photoconductive switches. The 1 cm gap switch was triggered by the laser light of the power level. When the bias voltage was 60 kV, the amount of kA Level current.
The work of the bias voltage is lower than the foreign research group 1 order of magnitude, the trigger light energy is lower than the foreign 3 orders of magnitude, the use of a single commercial Fiber Coupled Diode Laser to obtain kA magnitude of the high current. The GaAs photoconductive switch and its trigger system with all solid, small size, low price advantage.
Works of innovation mainly for:
(1) GaAs Photoconductive Switch for Trigger Light Source with Fiber Coupled Diode Laser , instead of the traditional mention of a large solid-state laser. You can get low-cost, small-volume high-power pulse source.
(2) on the GaAs photoconductive switch trigger design, high pressure design, making the micro-focus in the weak light trigger, the sub-ohm load on the kA magnitude of the strong current pulse.
(3) using the circuit model and the theory of optical excitation charge domain to explain the electric pulse waveform does not appear lock-on phenomenon reasons.