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  • 1985-1989  (2)
  • 1989  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 509-516 
    ISSN: 0392-6737
    Keywords: Photoelectric and optoelectronic devices and systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Gli autori discutono l’effetto della emissione spontanea incoerente sull’ampiezza dell’impulso laser in un FEL nel corso dell’evoluzione del segnale. Le espressioni riportate sono derivate nel contesto della teoria dei supermodi precedentemente sviluppata relativamente al regime di basso guadagno e piccolo segnale e nell’ipotesi di pacchetto di elettroni lungo.
    Abstract: Резюме В этой статье мы обсуждаем влияние некогерентного спонтанного нзлучения на ширину импульса в лазере на свободных электронах. Мы анализируем зависимость пространственной ширины импульса лазера от числа пролетов в рамках теории супер-мод. Мы также исследуем дисторсию, индуцированную в спектре супермод из-за некогерентного излучения.
    Notes: Summary In this paper we discuss the effect of the incoherent spontaneous emission on the FEL pulse width. We analyse the dependence of the laser spatial width on the number of round trips, within the framework of the supermodes’ theory. We also study the distortion induced in the supermode spectrum by the incoherent emission.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0392-6737
    Keywords: Excimer lasers ; Ultraviolet spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto I coefficienti di guadagno a piccolo segnale e di assorbimento di un laser a eccimero XeCl, preionizzato a raggi X, sono stati misurati sia in funzione del tempo che della lunghezza d'onda. Inoltre sono stati ottenuti due valori per l'intensità di saturazione usando l'analisi di Rigrod sull'evoluzione dell'intensità fotonica all'interno della cavità e misure di guadagno in condizioni di saturazione.
    Abstract: Резюме Измеряются усиление малых сигналов и коэффициенты поглощения рентгеновского, предионизонного XeCl лазера с высокой однородностью. С высоким разрешением одновременно определяются временная эволюция и зависимость от длины волны. Получаются две различные оценки интенсивности насьшения, используя анализ внутриполостной интенсивности и измерения усиления.
    Notes: Summary The small signal gain and absorption coefficients of a high uniformity, X-ray preionized XeCl laser have been measured. Their time evolution and wavelength dependence have been simultaneously detected with high resolution. Two distinct estimates of the saturation intensity were obtained by means of a Rigrod-type analysis of the intracavity intensity and by using saturated gain measurements.
    Type of Medium: Electronic Resource
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