MixTrain 15

Frequency Mixing in Periodically Poled Crystals

The MixTrain is using quasi-phase matching in periodically poled crystals for sum- or difference frequency mixing of two cw-lasers. Typically, one of the lasers will be a tunable Titanium-Sapphire laser like the Matisse while the other laser is a powerful fixed wavelength fiber laser operating at 1550 nm. The system uses a motor controlled translation stage for changing the period of the crystal and a temperature stabilized oven capable of heating up to 180 °C.
All optics for beam shaping, polarization control, beam combination, and beam separation are included. An optical diode isolates the fiber laser input from back reflections from the setup.

Tuning Ranges

Fiber Laser 2) Matisse Range Power 1)
1550 nm 690-1015 nm Sum 488-615 nm > 2 W at 520 nm
Difference 1650-2800 nm > 200 mW at 1700 nm


Standard Crystals Scan Range 3)
PPCS1-TiS-15 Periodic Poled Crystal, 488-550 nm 25 GHz
PPCS2-TiS-15 Periodic Poled Crystal, 545-615 nm 25 GHz
PPCD2-TiS-15 Periodic Poled Crystal, 1650-1900 nm 40 GHz
PPCD3-TiS-15 Periodic Poled Crystal, 1900-2900 nm 40 GHz

Periodically Poled Crystal Characteristics

Maximum Length 40 mm
Maximum Width 33 mm
Temperature Range 20-180 °C
Rec. Size of Period Domain 1 mm x 1 mm
Beam Polarization vertical


1) Matisse 4.5 W output, fiber laser 10 W output
2) for other lasers contact Sirah
3) scan range without change of crystal temperature
4) please contact Sirah for compatibility with other pump lasers
Pump Lasers 4) Matisse Titanium-Sapphire Laser (max. 5 W output)
Single-Frequency Fiber Laser (max. 15 W output)
Ambient Conditions constant temp. in the 20-30 °C range, 80% max. rel. humidity, non condensing
Cooling required for crystal (< 20 Watt, chiller of pump laser can be used)
Laboratory vibrational isolated optical table, dust-free air (flow box)
Computer Control Windows XP / Vista / 7 / 8 / 10, USB-Port

Optical Layout


All Dimensions in mm. Specifications are subject to change without notice.

Literature & Downloads

Datasheet MixTrain 15