OPA Technology

FOPA: Frequency Domain Optical Parametric Amplification

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Employing multiple, individually tunable nonlinear crystals in the Fourier plane means:
- Simultaneous upscaling of peak power & spectral bandwidth.
- Gain tailoring by spatial pump beam shaping.
- Upscaling not limited by crystal aperture.
- Transform limited ps pulses in Fourier plane.
- No extra stretcher / compressor required.
- Only “small” gratings required in the 4f setup.
- Can be pumped by stretched Ti:Sa pulses or ps Yb lasers.

Deep UV pulse shaping

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Decomposing a broadband pulse into single wavelengths prior to nonlinear interaction:
- Reduces intensity.
- Avoids mixing of wavelenghts.
- Permits linear transfer of arbitrairy phase functions.
- Enables deep UV pulse shaping down to 207nm - just with a conventional shaper prior to the Ti:Sa amplifier.

High power IR-OPA

- Based on Ti:Sa laser pump sources

- 5 cycle pulses, 10 mJ, 1.8 µm wavelength 

(a): spectrum of the unamplified OPA Idler in red and spectrum of the amplified Idler (1.8 µm) in black.

(b): autocorrelation trace of the OPA output in red and the amplified IR pulses (1.8 µm) in black.

“10 mJ 5-cycle pulses at 1.8 µm through optical parametric amplification”, Appl. Phys. Lett. 106, 091110 (2015).

High power few-cycle IR pulses for ATTO-Science

- Based on Ti:Sa laser pump sources

- 2 cycle pulses, 5 mJ, 1.8 µm wavelength 

Fiber input and output pulses.

(a) Spectrum of the multi-cycle input pulse in red compared with the spectrum at a pressure 300 mTorr at the exit side in shaded blue.

Inset: CCD images of the input pulse focal spot (up) and of the output pulse collimated at 2 m after the fiber.

(b) Autocorrelation trace of the multi-cycle input pulse in red and of the compressed 2-cycle pulse. Dotted lines denote a Gaussian fit.

"0.42 TW 2-cycle pulses at 1.8 µm via hollow-core fiber compression”,  Appl. Phys. Lett. 107, 181101 (2015).