Table 1.

Theoretical spectral dispersion and compensation of TeO₂ AODs. The following parameters are used: wavelength λ=720 nm; spectral bandwidth Δλ=3.68 nm; AOD aperture D=10 mm; acoustic velocity ν=676 m∕sec; scan range θ_scan=42.6 mrad; diffraction θ_diffraction=0.0634 mrad; grating pitchd=150 grooves∕mm; effective compensation frequency $f_{\mathrm{comp}}=\nu d∕\sqrt{2}=71.7\mathrm{MHz}$; and compensation ${\theta }_{\text{grating}}=\sqrt{2}\Delta \lambda f_{\mathrm{comp}}∕\nu =552\mu \mathrm{rad}$.

		fmin=50 MHz	f0=70 MHz	fmax=90 MHz
2-D spectral dispersion θdispersion	$\Delta \lambda \sqrt{f_x^2+f_y^2}∕\nu$	385	539	639 μrad
Dispersed resolution N	θscan∕θdispersion	110	79	61 spots
Spot elongation S	θdispersion∕θdiffraction	6.1×	8.5×	10.9×
2-D spectral dispersion θcompensated	∣θdispersion−θgrating∣	167	13.1	141 μrad
Compensated resolution N′	θscan∕θcompensated	253	672t1fn1	302 spots
Compensated spot elongation S′	θcompensated∕θdiffraction	2.64×	0.21×	2.22×

When θ_compensated<θ_diffraction, the number of compensated spots becomes N^′=θ_scan∕θ_diffraction, and the scanning is diffraction limited.