M. Garavaglia

Ionic assignment of unidentified xenon laser lines

Spectroscopic techniques have made possible the observation and ionic assignment of unclassified xenon laser lines.

Optical image subtraction through speckle modulated by young fringes

Abstract A new method for subtracting images is proposed. It is based on assigning complementary Youngs fringes to the speckles of the common parts of two images. In this way, carrier frequency is cancelled, and “a-posteriori” spatial filtering shows only noncommon parts. Suggestions on applications of the method are briefly commented.

Vibration analysis with young's fringes modulated speckle

Abstract A new method for vibrational analysis is proposed. It is based on the deblurring of time-averaged Youngs fringes inside speckle grains in the image of a vibrational object. A spatial filtered image of the recording of those speckles, modulated by Youngs fringes, shows the loci of points of equal vibratory amplitude.

Stereograms through a speckle carrier

A new method for registering stereograms in which an orientated speckle pattern supplies the desired directivity for obtaining horizontal parallax is presented. This is accomplished by employing an optical system whose pupil consists of a double-fan aperture. In this way, the stereogram has a built-in reconstruction mechanism, and the stereo image can be observed with almost any extended white light source and without using any optical device. Furthermore, more than two points of view of the 3-D scene can be stored in a single plate by adequate positioning of the above-mentioned aperture.

About unidentified ionized Xe laser lines

Observation of eleven unknown spontaneous spectral lines explains the appearance of corresponding laser lines.

Real-time white light pseudocolor density encoder

Abstract A simple method for pseudocolor encoding of gray level information is proposed. It is based on the real-time addition of the positive and negative images of an object transparency, each one obtained in a different color. Conventional white light lamps with adequate color filters are used. Some experimental results are shown.

Color storage and image processing through Young's fringes modulated speckle

A simple application of the Young’s fringes modulated speckle for color storage in black and white film is presented. As the speckle grains in the image are coded by Young’s fringes, information processing operations, like subtraction, spatial derivative, contrast‐enhancement, etc., can be performed.

Spectroscopic analysis of the crossed field excited C3 IIu-B3 IIg (0-0) UV laser band of N2 at low temperature

A liquid air refrigerated crossed field stimulated emitter was constructed to observe the 0-0 UV (337,1 nm) laser band of molecular nitrogen. The spectral analysis clearly showed that only one of the Λ-doublets were observed. The Λ-doublet components belong to two different Fortrat parabolas. This result allows a critical discussion of previous publications on the same subject.

Frequency locking in double-pumped dye laser

A jet-stream dye laser was pumped simultaneously by a CW argon laser and a high-power xenon ion laser. The frequency and bandwidth of the pulsed radiation obtained were locked to the CW radiation inside the folded cavity.

A xenon ion pumped open dye stream laser

A pulsed xenon ion laser with an output power of 1 kW over the blue-green lines was used to pump an open dye stream laser. An efficiency of the order of 40 percent was determined in broad-band mode operation. The bandwidth in this case was 48 nm (from 582 to 630 nm).