ABSTRACT
We demonstrate a compact system for single-pass frequency doubling of high-power GaN diode laser radiation. The deep UV laser light at 222.5 nm is generated in a ß-BaB2O4 (BBO) crystal. A high-power GaN external cavity diode laser (ECDL) system in Littrow configuration with narrowband emission at 445 nm is used as pump source. At a pump power of 680 mW, a maximum UV power of 16 µW in continuous-wave operation at 222.5 nm is achieved. This concept enables a compact diode laser-based system emitting in the deep ultraviolet spectral range.
ABSTRACT
The recently calculated high diffraction efficiencies for TE- and TM-polarized light (perfect blaze) for echelette gratings are explained by four-wave interference, which is formed as a double periodical pattern in the cross section of the grating plane. The blazed grating profile should match this interference pattern for a single reference light wavelength. The recently published data are the special case of a general design. The prognoses of the model are connected with large grating constants in comparison with the light wavelength, where short grating constants need comparison with numerical methods.
ABSTRACT
Quite a number of complications were found to occur time and again in the treatment of children for supracondylar humerus fracture, with displacement of the arm axis being a frequent long-term result. However, functionality of the arm usually has not been impaired.
Subject(s)
Postoperative Complications/etiology , Shoulder Fractures/surgery , Adolescent , Adult , Arm/innervation , Child , Child, Preschool , Female , Follow-Up Studies , Fracture Fixation, Internal , Humans , Male , Peripheral Nervous System Diseases/etiologyABSTRACT
In 135 cases of supracondylar fractures of the elbow in children, disorders of the innervation of the peripheral brachial nerves could be observed in 10 cases. Early and careful reposition of the fragments is most important for early restitution of function and sensibility.
