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GTI Mirrors
GTI mirrors
GTI mirrors (Gires-Tournois interferometers) are used for strong time alignment of a very narrow wavelength range. This makes them particularly well suited for compact ps laser systems (e.g. Yb:YAG or Yb:KGW lasers).
Example values for common GTI mirrors:
| Wavelength Range | Reflecitance [%] | GDD [fs2] |
|---|---|---|
| 1020 – 1080 nm | 99.9 | -250 ±50 |
| 780 – 820 nm | 99.8 | -500 ±75 |
| 1040 nm | 99.95 | -1000 ±100 |
| 1030 nm | 99.9 | -10000 ±1500 |
GDD spectra of diverse GTI mirrors for 1030 nm with different GDD values (GTI mirror for Yb: YAG and Yb: KGW laser)
LAYERTEC has been manufacturing GTI mirrors for leading ps laser manufacturers worldwide for over two decades.
For increasing pulse power and/or high repetition rates, you can also achieve the desired correction by using multiple GTI mirrors. For extreme requirements, compromises usually have to be made between maximum reflectivity, GDD value and damage threshold. With heavy loading of such systems, the problem of thermal lensing already occurs before destruction.