After the photographic plate, successive generations of electronic detectors, such as the charge-coupled device (CCDs), have been perfected, each with more sensitivity and resolution, and often with a wider wavelength coverage.

In addition to applications in nonlinear and ultrafast optics, Raman amplification is used in optical telecommunications, allowing all-band wavelength coverage and in-line distributed signal amplification.

Combined, they give Planck unparalleled wavelength coverage and the ability to resolve faint details.

The spectrometer has a wavelength coverage of 625 nm to 2500 nm and observes the whole sky.

TripleSpec (Tspec) is a near infrared spectrograph which provides continuous wavelength coverage over the range 0.94-2.46 microns at moderate resolution (R 3500, depending on the choice of slit).

The sensor has a field-of-view of 2.4 x0.15 and sweeps out a 2.4 x17 field-of-regard during each 90 second scan, with wavelength coverage between 800Å and 1700Å at 23Å resolution.

By using a larger array and a cross disperser, iShell will have much larger wavelength coverage per setting than CSHELL.

The instruments overlapped in wavelength coverage, providing consistency check on measurements in the regions of spectral overlap and assistance in discriminating signals from our galaxy, solar system and CMB.

Conversely, SEGUE is a northern hemisphere survey with selected angular coverage, deep exposures, low-resolution but large wavelength coverage.

It also will have infrared instruments with longer wavelength coverage and greatly improved sensitivity than Hubble.