Abstract
A compact, walk-off compensated dual-wavelength KTP OPO near the degenerate point of 2.128 μm pumped by a Nd:YAG pulsed laser is employed as the pump for terahertz (THz) source based on difference frequency generation (DFG) in a GaSe crystal. Coherent THz radiation that is continuously tunable in the range of 81-1617 μm (0.186-3.7 THz) is achieved. An enhancement of 76.7% in average for the THz energies at different wavelengths is realized using the walk-off compensated KTP OPO than the common one. Using a 8 mm-long GaSe crystal, the maximum output THz pulse energy is 48.9 nJ with the peak power of 11 W, corresponding to the energy conversion efficiency of 5.4 × 10- 6 and the photon conversion efficiency of about 0.09%.
| Original language | English |
|---|---|
| Pages (from-to) | 3520-3524 |
| Number of pages | 5 |
| Journal | Optics Communications |
| Volume | 283 |
| Issue number | 18 |
| DOIs | |
| State | Published - 15 Sep 2010 |
| Externally published | Yes |
Keywords
- Difference frequency generation
- GaSe
- Terahertz wave
- Walk-off compensate
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