Optional tuning range extensions
As mentioned above, the tuning range of PGx01 series OPG can be extended by adding additional nonlinear conversion stages. Optional second harmonic generation (SHG), sum-frequency generation (SFG), or difference frequency generation (DFG) stages allow access to spectral ranges that are not accessible by conventional laser sources.
There are many possible ways to add extension stages to the PGx01 series unit, however, the following configurations are most common:
- PG401-SH – second harmonic generator is used to extend the tuning range down to 210 nm resulting in a total tuning range of 210 to 2300 nm.
- PG401-DFG1P provides the broadest hands-free tuning range – from 420 nm to 10 000 nm. It can be further extended to 16 000 nm with -DFG2 option, however, it should be noted, that for the 10 000-16 000 nm range a different nonlinear crystal is used and exchange of the crystals needs to be done manually.
- PG501-DFG1P unit has a narrower tuning range of 680 nm – 10 000 nm and is a cost-effective choice for customers who need only the IR tuning range (for example for vibrational-SFG spectroscopy on surfaces). The tuning range also can be extended to 16 000 nm in the same way as for the PG401 unit.
Available standard options are summarized in a table on the page below. Custom configurations are available on request.
Optional tuning range extensions specifications sheet 1)
| Extension |
SH |
DFG1 |
DFG1P |
DFG2 |
| Available on models |
PG401 |
PG401 and PG501 |
PG401 and PG501 |
PG401 and PG501 |
| Tuning range |
210-419 nm |
2300-10 000 nm |
2300 - 10 000 nm |
2300 - 16 000 nm 7) |
| Output pulse energy 2) |
> 100 µJ |
> 125 µJ |
> 250 µJ |
> 250 µJ at 3700 nm
> 100 µJ at 10 001 nm |
| Linewidth |
< 9 cm-1 |
< 6 cm-1 |
< 6 cm-1 |
< 6 cm-1 |
| Scanning step |
0.05 nm |
1 nm |
1 nm |
1 nm |
| Typical beam size 3) |
~3 mm |
~6 mm |
~9 mm |
~9 mm |
| Typical beam divergence 4) |
< 2 mrad |
< 3 mrad |
< 3 mrad |
< 3 mrad |
| Polarization |
vertical |
horizontal |
horizontal |
horizontal |
| Pump laser requirements |
| Pump pule energy |
| at 1064 nm |
- |
5 mJ |
10 mJ |
15 mJ |
| at 532 nm 5) |
- |
10 mJ |
10 mJ |
10 mJ |
| at 355 nm 6) |
10 mJ |
8 mJ |
8 mJ |
8 mJ |
| Recommended pump laser 8) |
PL2251A-TH |
PL2251 |
PL2251A |
PL2251B |
| Recommended harmonics generator module 9) |
- |
H400/H500 |
| Physical characteristics |
| Size (WxHxL) |
456x273x1026 mm |
| Operating requirements |
| Room temperature |
15-30 °C |
| Mains voltage |
100-240 V single phase, 47-63 Hz |
| Power consumption |
< 100 W |
1) All specifications are subject to change without notice. Parameters marked typical are not specifications. They are indications of typical performance and will vary with each unit we manufacture. Unless stated otherwise all specifications are measured at 280 nm for -SH option and at 3700 nm for -DFGx options.
2) See tuning curves for typical pulse energies at other wavelengths.
3) Beam diameter is measured at the 1/e2 point.
4) Full angle measured at the FWHM point.
5) For PG501-DFGx units only.
6) For PG401-DFG units only.
7) 10 000 -16 000 nm range is accessible after manual reconfiguration of DFG stage.
8) If a pump laser other than the PL2251 series is used, measured beam profile data should be presented when ordering.
9) H400 is recommended for PG401-DFGx pumping, H500 for PG501-DFGx pumping. See Fig. 2; Fig.3; and Fig.4 for recommended arrangement of pumping laser, harmonics generator module and PGx01 units. |
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