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Holograms have been recorded on the surface of Si by means of a photoanodic reaction. Resolution better than 2500 lines∕mm have been achieved in holographically recorded gratings. Diffuse object holograms with reconstruction efficiencies as high as 10% have also been obtained.
Time delay of lasing transitions in carbon monoxide was investigated at 77 °K under pulsed electrical excitation. Inversion is attributed to anharmonic decoupling which makes v‐v relaxation ineffective for levels above a value v e =1 + kT∕hc 2ω e x e . Initial lasing occurs near v e with...
The absorption edge of GaN rises exponentially to a value of about 4 × 10 5 cm −1 at 3.5 eV (at 300 °K) suggesting direct optical transitions and a high joint density of states. Another absorption, which sets in beyond 1.3μ, increases with the 7th to 8th power of the wavelength.
The paper describes a CaMoO 4 transmission‐type acousto‐optic filter. Tuning from about 6700 to 5100 Å is obtained by changing an acoustic frequency from 40 to 68 MHz. The filter bandwidth is 8 Å at an f ∕6 aperture. 95% transmission is obtained at an acoustic power density of 69 mW∕mm 2 .
The present theory of amplification of Rayleigh waves by drifting carriers in a semiconductor neglects the possibility of surface states. Experimental investigations of the propagation of Rayleigh waves on CdS have revealed in many samples behavior that differs markedly from theoretical...
Experiments have been performed that measure the time dependence of stimulated fluorescence from acidified solutions of 4‐methylumbelliferone and 7‐hydroxycoumarin. The results show that laser action takes place from excited state complexes. It was found that exciplex emission is delayed...
Velocities and attenuations of piezoelectric leaky surface waves in LiNbO 3 are computed. As the result, we have found that the effective electromechanical coupling coefficient of the leaky surface wave propagating along the x axis of the 64° rotated y ‐cut plane is very large, K 2 =0.113; and...
Thermally induced oscillations are observed in semiinsulating O 2 ‐doped GaAs double‐injection devices, by heating them beyond a critical temperature. In addition, a stable voltage‐controlled negative‐resistance characteristic has been obtained by suitable device termination. Possible...
A water‐cooled CO☒He☒N 2 ☒O 2 laser has been operated at 20 °C with a cw output of 10 W corresponding to an efficiency of 5.5%. With addition of xenon, the same mixture gave an output of 25 W with an efficiency of 12%. The efficiency increased to 17% with addition of both xenon and mercury.
Thermal blooming of a 10.6‐μ laser beam in a CO 2 absorption cell has been investigated with high time and position resolution. Good agreement has been found between experimental results and calculations made using an eikonal treatment.
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