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(a) The spherical wavefront IL arrangement for chirped gratings; and (b) the 6° tilted hyperbolic chirped grating (solid lines) and the elliptic period contour (dashed lines). The position of the laser material during the exposure is indicated.
Expected chirped-grating DFB tuning curves based on the focal length of the lens used for the IL. Dashed line for and solid line for . Triangles represent the measured wavelengths.
[(a)–(c)] Experimentally obtained transmittance spectra of methane at 20, 100, and 400 torr, respectively; [(d) and (e)] HITRAN simulations of methane spectra at 400 torr for a laser linewidth of 0.1 and 1 nm, respectively.
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