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From newport.com
Direct measurements of laser pulses less than 20ps using photo detectors remain a challenge. The response time of high-speed photodiodes is currently limited to around 20 picoseconds; moreover, large bandwidth oscilloscopes (>60 GHz) required to accurately measure the output of these detectors are quite expensive. Several indirect methods for measuring ultrashort pulses have been developed. Detailed reviews can be found in, “Frequency-Resolved Optical Gating: The Measurement of Ultrashort Laser Pulses,” by Rick Trebino, Kluwer Academic Publishers, Boston, 2002, and “Ultrashort Laser Pulse Phenomena,” by Jean Claude Diels and Wolfgang Rudolph, Academic Press, New York, 1995. When phase information of the pulse is not required, autocorrelation is the simplest and most affordable method for determining pulse width. Figure 1.1 illustrates a typical autocorrelator setup. The principle of operation is based on recording the second order correlation function using a Michelson Interferometer. Products & Services
Energy meters measure the total energy of a single pulse and optical power meters measure the average power of a continuous light beam.
Infrared (IR) spectrometers measure the wavelength and intensity of the absorption of infrared light by a sample.
Interferometers measure distance in terms of wavelength and determine the wavelengths of light sources.
Manual pulse generators institute a command pulse when the handle is turned manually.
Digital delay generators are electronic test equipment that generates delays (pulses at precise, programmed intervals) to trigger devices under test.
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Topics of Interest
Direct measurements of laser pulses less than 20ps using photo detectors remain a challenge. The response time of high-speed photodiodes is currently limited to around 20 picoseconds; moreover, large...
(Read More)
As a consequence of the time-bandwidth uncertainty principle, ultrashort laser pulses carry significant bandwidth. If the spectral components that fall under the bandwidth of the laser pulse are time...
(Read More)
Spectral broadening, also known as continuum generation, arising from the interaction of intense ultrashort laser pulses with nonlinear materials is a well known, highly exploited phenomenon.1 White...
(Read More)
The description of the Gaussian pulse given by (1) is intuitive in the sense that it is fairly straightforward to conceptualize a pulse in the time domain. However, when dealing with pulses traveling...
(Read More)
The description of the Gaussian pulse given by (1) is intuitive in the sense that it is fairly straightforward to conceptualize a pulse in the time domain. However, when dealing with pulses traveling...
(Read More)
Technical Articles
Long Scan Autocorrelator (.pdf)
- Lasers
Long Scan Autocorrelator (.pdf)
- Test and Measurement
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