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• W2093366878 abstract "David G. ScerbakElectro -Optics TechnologyFremont, CA 94538ABSTRACTThe construction and operation of a long pulse, single -mode Nd:YAG laser isdescribed. The laser is configured around an injection- seeded, unstable oscillator /singleamplifier and produces 80 ns pulses at 10 Hz with pulse energies of over 300 mJ. Whenfrequency doubled, the infrared is converted to a 56 ns pulse at 532 nm with a Fourier -limited linewidth of 8 MHz. This approach brings the Nd:YAG source to within the bandwidthdomain normally dominated by visible CW lasers, but at a considerably higher power, thusproviding an attractive alternative for applications in high resolution spectroscopy andnon -linear studies.1. INTRODUCTIONThe importance of narrowband laser light to high resolution spectroscopic studies iswell recognized. While pulsed sources have found some application, the use of linewidth-narrowed and stabilized CW ion and dye lasers has long been the convention in fulfillingexperimental requirements for narrow bandwidths of better than 10 MHz. Unfortunately, CWlasers rarely provide line- narrowed powers greater than several watts without extraordinaryattention to stabilization and cooling requirements. For kilowatt or greater powers, pulsedsources appear far more practical and efficient, but only if the coherence properties of CWlasers can be emulated. With the recent development of laser- diode -pumped, single -modeNd:YAG lasers1,2,3 and the demonstrations of injection locking`,' Fourier- limited operationof high -power Nd:YAG lasers is now easily performed and commercially available. Though mostattention has been directed toward highest power pulse durations of around 10 ns, to producelinewidths of less than 10 MHz, pulses of greater than 44 ns must be generated.The production of long single mode pulses in Nd:YAG may be approached in severalways. Certainly the most versatile source would result from chain amplifying an acousto- orelectro- optically shaped single mode CW laser emission. In order to compete with the powerlevels of other available continuous lasers, however, this method can become quite costlyand complex, though multipass slab amplifier geometries promise to make this a moreattractive technique.6 Long pulses may also be generated in stable or unstable Q- switchedNd:YAG oscillator configurations. Lengthening the pulse build -up time or forcing thestimulated photons within the cavity to circulate longer before saturating the rod gainresults in a longer ejected pulse. Furthermore, injection locking these longer pulses to asingle mode master frequency yields narrowband light robust enough for immediate poweramplification.We have constructed a stable source of high power, Fourier transform -limited, 80 nswide laser pulses using an injection -seeded unstable resonator and a single stage ofamplification, which provides more than 300 mJ of output energy per pulse. The design is aslightly modified version of an earlier system,7 but the technique may certainly be appliedto virtually any Q- switched resonator.2. SYSTEM DESCRIPTIONThe entire system, illustrated in Fig. 1, consists of five principle stages: masteroscillator, slave oscillator, isolation, amplification and frequency doubling. The masteroscillator is a Lightwave Electronics S -100 Injection Seeding System. It is a compactpackage housing a well -stabilized, laser- diode -pumped, single -mode Nd:YAG ring laser,Faraday isolator and associated electronics, and provides almost 2.5 mW of CW power in a" @default.
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• W2093366878 date "1988-06-22" @default.
• W2093366878 modified "2023-09-23" @default.
• W2093366878 title "High-Power 80-Ns Transform-Limited Nd:YAG Laser" @default.
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• W2093366878 doi "https://doi.org/10.1117/12.945501" @default.
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