Abstract:
A broadband tunable in-fiber filter (10) includes a grating (15) with divergent ridges (19) which can be translated transversely of a side-polished optical fiber (11) to vary the periodicity at an exposed evanescent field. The divergence is gradual so that at any given transverse position of the grating (15), the ridges (19) interacting with the evanescent field are effectively parallel. The divergence is great enough so that a tuning-to-reflected bandwidth ratio of about 33:1 is demonstrated. The grating (15) is fabricated in an amorphous silicon film on a fused quartz substrate. The film is coated with photoresist which is exposed to a holographic interference front. The substrate is tilted with respect to an interference front created by two spherically diverging beams to achieve the desired divergence. Subsequent processing, including etching are standard.
Abstract:
A method (41-49, 410, 411) of dynamically changing the measurement window and operating parameters of the instrument, based on intermediate results, in order to minimize the total time required to make a complete measurement. Also, a method (412-415) of combining partial results from subwindows into a final result to be displayed that has not been corrupted by variation in system response due to time-varying operating parameters.
Abstract:
Thermal ink jet printhead and method of manufacture featuring an improved all-metal orifice plate and barrier layer assembly (28). This assembly includes constricted ink flow ports (58) to reduce cavitation damage and smooth, contoured convergent ink ejection orifices (32) to prevent ''gulping'' of air during an ink ejection process. Both of these features extend the maximum operating frequency, fmax, of the printhead. The nickel barrier layer (26) and the underlying thin film resistor substrate (38) are gold plated and then soldered together to form a good, strong solder bond at the substrate - barrier layer interface.
Abstract:
A sputtering target (176) has a sputtering surface with first and second regions (208, 206) of respective first and second materials. The first region (208) comprises a surface of a first member (208) of the first material, such as a circular cobalt plate. The second region (206) comprises a surface of second member (206) of the second material, such as a platinum ring. A cobalt cover ring (210) clamps the platinum ring (206) to the cobalt plate. By varying the relative sizes of the first and second regions (208, 206) as by changing the size of the cover ring (210) to expose more or less of the platinum ring (206), the concentration of the two materials in a layer deposited from the target (176) onto substrates (260) is varied. In addition, by imparting planetary motion to substrates (260) during deposition and sizing and positioning the exposed portion of the platinum ring (206) a radial coercivity gradient is established in the layer deposited on the substrates (260).