TABLE I.

Grating parameters. High Harmonic efficiency (${\text{HH}}_{\text{eff}}$) is determined by the geometrical parameters of the grating and represents the most efficiently diffracted harmonic in the first order, with its equivalent energy in brackets assuming a 790 nm fundamental wavelength. σ is the number of grooves per millimeter. $\Delta t$ is the temporal dispersion for two particular energy values calculated by ray tracing, and $\Delta E$ is the energy dispersion, obtained using Equations (1) and (2).

σ (gr/mm)	blaze angle (deg)	HHeff	E (eV)	$\Delta t$ (fs)	$\Delta E$ (eV)
200	4.2	15th (23.5 eV)	30	54	0.6
…	…	…	40	40	1.0
600	3.4	55th (86.3 eV)	80	60	1.3
…	…	…	100	50	2.1
900	14.3	21st (32.9 eV)	30	240	0.1
…	…	…	40	180	0.2
1200	6.9	55th (86.3 eV)	80	120	0.7
…	…	…	100	100	1.0