Showing papers on "Femtosecond pulse shaping published in 1971"
TL;DR: In this paper, an instrument for measuring dynamic spectrograms is described, which involves the use of a spectrometer with ultrafast time response and has been used in an antisymmetric mode to measure frequency sweep rate as a function of wavelength.
Abstract: A dynamic spectrogram depicts intensity as a function of frequency and time simultaneously, subject to the classical uncertainty relation δωδt≈2π. For an optical pulse having the Fourier transform |g(ω)|eiφ(ω), high‐resolution spectroscopy gives |g(ω)|2, while the dynamic spectrogram gives knowledge of ∂φ(ω)/∂ω permitting reconstruction of many features of the amplitude and phase modulations of the original pulse. Linear, parabolic, and two sinusoidal spectrogram shapes are interpreted theoretically. An instrument for measuring dynamic spectrograms is described. It involves the use of a spectrometer with ultrafast time response and has been used in an antisymmetric mode to measure frequency sweep rate as a function of wavelength for picosecond laser pulses. The change in the dynamic spectrogram of a pulse brought about by linear pulse compression and the resultant change in pulse envelope shape have been computed for a typical picosecond pulse.
91 citations
TL;DR: In this paper, a train of picosecond pulses was used to pump a stimulated Raman oscillator designed such that the generated Stokes pulse was amplified by successive pump pulses, achieving a minimum Stokes•pulse duration of ≃ 0.3 psec.
Abstract: A train of picosecond pulses was used to pump a stimulated Raman oscillator designed such that the generated Stokes pulse was amplified by successive pump pulses. In this way partial group velocity matching could be achieved and significant time narrowing of the Stokes pulse realized. With benzene as the Raman active material, a minimum Stokes‐pulse duration of ≃ 0.3 psec was recorded.
39 citations
TL;DR: In this paper, an intensity correlator involving phase-matched second-harmonic generation in LiIO 3 was used to measure the amplitude fluctuations within a pulse and the correlation between fluctuations of consecutive pulses.
Abstract: CW-excited GaAs lasers can emit self-induced pulses. To study these pulses we have used an intensity correlator involving phase-matched second-harmonic generation in LiIO 3 . Besides measuring the pulsewidth and the repetition rate we investigated the amplitude fluctuations within a pulse and the correlation between fluctuations of consecutive pulses.
21 citations
TL;DR: Some interesting theoretical and experimental holographic coherence length curves are presented for a Q-switched laser oscillator and amplifier system.
Abstract: A theoretical treatment of holographic brightness for a gaussian-shaped laser pulse permits a more rigorous consideration of holographic coherence length for single-mode (TEM00q) pulse laser. Three cases are treated: (1) the ideal single frequency pulse laser oscillator; (2) the pulse laser oscillator with frequency sweep; and (3) the pulse laser oscillator with frequency sweep along with the laser amplifier with frequency shift. Some interesting theoretical and experimental holographic coherence length curves are presented for a Q-switched laser oscillator and amplifier system.
18 citations
TL;DR: In this paper, the authors calculated the ballistic deficit for proportional counter pulses shaped by different pulse shaping networks and found that networks with better signal-to-noise performance than the simplest CR-RC filter have been investigated with respect to attenuation of counter pulses.
14 citations
TL;DR: In this article, an electro-optic switching circuit is described which will produce a pulse of duration 1 ns or less from a ruby laser, which is driven by a full-wave voltage pulse.
Abstract: An electro-optic switching circuit is described which will produce a pulse of duration 1 ns or less from a ruby laser. The switch external to the Q-spoiled oscillator cavity, uses a KD*P Pockels cell which is driven by a full-wave voltage pulse. The laser pulse, after *15 amplification, has an energy of 3*10-2J and is sufficiently coherent and free of jitter to find a ready application in the diagnostics of highly transient plasma.
7 citations
6 citations
TL;DR: Simultaneous mode locking and pulse coupling of a CO2 laser has been achieved using a single internal GaAs element with electrodes on both the (001) and (110) faces as discussed by the authors.
Abstract: Simultaneous mode locking and pulse coupling of a CO2 laser has been achieved using a single internal GaAs element with electrodes on both the (001) and (110) faces. Coupling of pulses from the laser did not affect the stability of the mode‐locked pulse train. Possible application of the technique to pulse‐code modulation of the CO2 laser is discussed.
5 citations
TL;DR: In this article, the relative roles of electrostriction and various types of Kerr effect in a nanosecond-long train of laser pulses self-focusing was assessed, even though the trapping threshold for a single picosecond pulse was very high.
Abstract: A nanosecond-long train of picosecond laser pulses theoretically can produce self-focusing by electrostriction, even though the trapping threshold for a single picosecond pulse is very high. The relative roles of electrostriction and various types of Kerr effect in picosecond pulse train self-focusing should be assessed.
2 citations
01 Jan 1971
TL;DR: An internally frequency-doubled, mode-locked Nd: YAG laser has been used to produce an output pulse train of sub-nanosecond 5320A pulses as discussed by the authors.
Abstract: An internally frequency-doubled, mode-locked Nd: YAG laser has been used to produce an output pulse train of sub-nanosecond 5320A pulses The laser operates in the TEM 00 transverse mode and produces an average harmonic output of approximately one-half watt The interaction between intra-cavity harmonic generation and mode locking affects the output pulse train in several aspects including pulse repetition frequency and pulse length These effects and the long-term stability of the laser are discussed This laser is particularly suitable for use as the transmitter of a pulse-code-modulation optical communication system Although the 5320A YAG laser has previously been considered for this application, crystal damage and output pulse stretching, have limited its usefulness This paper describes a laser which overcomes these limitations
1 citations
16 May 1971
TL;DR: In this paper, the PIN diode modulator provides a simple and accurate technique of generating pulses of confined spectrum, from measured amplitude and phase data on a commercially available modulator, the necessary bias input function to give a psuedogaussian pulse was computed and the resultant spectrum was measured and compared to computed spectrum.
Abstract: The PIN diode modulator provides a simple and accurate technique of generating pulses of confined spectrum. From measured amplitude and phase data on a commercially available modulator, the necessary bias input function to give a psuedogaussian pulse was computed, and the resultant spectrum was measured and compared to computed spectrum.