摘要:

Electrical pulses, 4 A in 10 psec, have been generated by rectification of 1.06‐&mgr;m pulses in LiTaO3: Cu++. Their amplitude and duration were measured by photographing the birefringence induced by the pulses propagating along an electro‐optic transmission line illuminated transversely in a Pockel's cell arrangement. The principal mechanism responsible for the generation is the macroscopic polarization resulting from the difference in dipole moment between the ground and excited states of the absorbing Cu++impurities.

ISSN:0003-6951    

DOI:10.1063/1.1653991

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Radiation‐induced apparent optical absorption in the wavelength range 0.5–2.5 &mgr; of thin silicon crystals, which were irradiated with 1.8‐MeV He+ions, is interpreted in terms of scattering from defect zones. Fitting the absorption and refractive index data to the predictions of Mie scattering theory allows determination of the average size, number, and refractive index of the defect zones. For 1015–1016ions cm−2incident on a crystal 2.8 &mgr; thick, this analysis indicated a zone radius of about 2200 Å, a refractive index for the zone of about 1.04 times that of undamaged silicon independent of wavelength, and ∼ 10−7zones produced per incident ion. At larger fluence, the zone size increased and the number of zones decreased. Transmission‐electron‐microscopy (TEM) observations confirm the presence of defective zones whose geometry, size, and number density are in reasonable agreement with the theoretical predictions.

ISSN:0003-6951    

DOI:10.1063/1.1653992

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

Compact cw single‐mode CO2: He : N2lasers with a 1‐mm‐diam dielectric waveguide discharge tube have exhibited gains of up to 37 dB/m, volumetric power outputs of 15 W/cm3, and saturation parameters of 3600 W/cm2with a coolant temperature of −70°C. With tap water cooling at 20°C the corresponding values were 24 dB/m, 9.5 W/cm3, and 2100 W/cm2. All of these values are substantially larger than those obtained with conventional CO2lasers. A 12.5‐cm‐long waveguide tube with an active volume of 0.096 cm3gave a power output of 1.4 W at −70°C and 0.9 W at 20°C coolant temperature.

ISSN:0003-6951    

DOI:10.1063/1.1653993

出版商:AIP    

年代:1972

数据来源: AIP

摘要:

The narrow‐band output of a small flashlamp‐pumped coaxial dye laser is injected internally into a large close‐coupled oscillator. When frequency locked, an effective power gain of ∼ 4000 and an energy output of ∼ 600 mJ in a width of ∼ 0.01 nm is achieved.

ISSN:0003-6951    

DOI:10.1063/1.1653994

出版商:AIP    

年代:1972

数据来源: AIP