## Abstract

Continuously tunable cw emission near 4.5 *μ*m was generated by difference frequency generation (DFG) within a Nd:YAG pumped optical parametric oscillator (OPO). The periodically poled lithium niobate crystal used for DFG contained eight grating bands that enabled wavelength tuning between 4.25 and 4.65 *μ*m. As much as 90 mW of power at 4.48 *μ*m was achieved for 16.7 W of pump.

© 2003 Optical Society of America

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### Equations (6)

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(1)
$$\mathrm{\Delta}{k}_{Q}={k}_{p}-{k}_{s}-{k}_{i}-2\pi /\mathrm{\Lambda},$$
(2)
$$1/{\mathrm{\lambda}}_{p}=1/{\mathrm{\lambda}}_{s}+1/{\mathrm{\lambda}}_{i},$$
(3)
$${n}_{p}/{\mathrm{\lambda}}_{p}={n}_{s}/{\mathrm{\lambda}}_{s}+{n}_{i}/{\mathrm{\lambda}}_{i}+1/{\mathrm{\Lambda}}_{1}.$$
(4)
$$1/{\mathrm{\lambda}}_{\mathrm{MWIR}}=1/{\mathrm{\lambda}}_{s}-1/{\mathrm{\lambda}}_{i},$$
(5)
$${n}_{\mathrm{MWIR}}/{\mathrm{\lambda}}_{\mathrm{MWIR}}={n}_{s}/{\mathrm{\lambda}}_{s}-{n}_{i}/{\mathrm{\lambda}}_{i}-1/{\mathrm{\Lambda}}_{2}.$$
(6)
$$I(\mathrm{\Delta}{k}_{\mathrm{DFG}})/I(0)={\mathrm{sinc}}^{2}(\mathrm{\Delta}{k}_{\mathrm{DFG}}L/2),$$