RESUMO
We demonstrate dispersion compensation in a terahertz-span optical frequency comb generator by use of an intracavity prism pair. With partial compensation of the material dispersion of the lithium niobate modulator, the span of the comb increases from 3.0 to 4.3THz.
RESUMO
We have achieved efficient electro-optic phase modulation at high frequencies in a resonant modulator cavity. We enhance modulation by matching the phase velocities of the optical and microwave fields in the modulator substrate and by placing the modulator inside an optical cavity that is resonant for the input optical beam and the generated sidebands. An optical frequency comb with a span of 3 THz and at a spacing of 17 GHz is generated with 1 W of microwave power. The terahertz comb is utilized to phase lock an optical parametric oscillator at a signal-idler difference frequency of 665 GHz.
RESUMO
We reviewed 13 cases of testicular tumors arising in cryptorchid, intra-abdominal testes. All types of germinal neoplasms were found, seminoma being the most common. Of the 13 patients 5 had undergone limited exploration previously, with no testis being identified and, thus, were thought to have had unilateral anorchism. The importance of a thorough exploration of the peritoneal cavity is emphasized.
Assuntos
Criptorquidismo/diagnóstico , Testículo/anormalidades , Adulto , Coriocarcinoma/complicações , Criptorquidismo/complicações , Diagnóstico Diferencial , Humanos , Masculino , Teratoma/complicações , Neoplasias Testiculares/complicaçõesRESUMO
Segmental ureteral replacement with free autogenous fibroelastic Dacron tube grafts in three dogs was unsuccessful during preliminary trials. However, a proliferation of urothelium, smooth muscle, and blood vessels throughout the length of the grafts was demonstrated, providing an encouraging potential for further investigations. Technical refinements are suggested that may provide for improved success with experimental ureteral replacement.