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We have observed that at certain levels of laser power, an argon ion laser oscillates in only two strong modes. The frequency difference between these two modes is an integer multiple of the cavity fundamental beat frequency and increases with the laser power. Analysis of this effect shows that...
Holograms of naturally illuminated objects are synthesized in two steps. A stereoscopic camera technique is used to record the objects' parallax qualities in white light; this photographic information is transformed into a hologram with coherent light. The image quality is excellent, and the...
The shift of the frequency of oscillation of the 00°1–10°0 rotation‐vibration band at 10.6 μ of a CO 2 laser has been investigated as a function of total pressure, CO 2 partial pressure, discharge current, and cavity mode position. The measurements were made by heterodyning two passively...
The generation of surface elastic waves by the transient surface heating of piezoelectric and nonpiezoelectric solids is described. A Q ‐switched ruby laser produces the surface heating; the frequencies of the resultant surface waves are Fourier components of the laser waveform. The use of a...
We report the suppression of low‐frequency noise in the He☒Ne and argon lasers as a result of mode coupling by means of an internal phase modulator. Suppression of off‐axis modes and 20 to 30 dB of low‐frequency AM noise suppression have been obtained in both FM and phase‐locked...
Experimental evidence is presented which (1) allows quantitative determination of the redistribution of Si impurities between Ga and As sites after Li diffusion; (2) shows there is no loss of Si to complex or pair formation when N Si ∼ 1−2 × 10 18 cm −3 ; and (3) indicates that the site...
The microwave transmission characteristics of the ferromagnetic semiconductor CdCr 2 Se 4 doped with Ag have been measured as function of the applied magnetic and electric field. The results are interpreted in terms of active helicon‐spin wave interactions; and the agreement between experiment...
The second harmonic pulse shape generated from ultrashort pulses is calculated. In long dispersive crystals the pulse width may be much broader than the incident pulse and the power conversion ratio may saturate at a low value. These effects should be prominent in LiNbO 3 with 4 × 10 −13 sec...
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