ASG. Second Harmonic Generator

Second optical harmonic generators (SHG) are used for upconversion (doubling) of the fundamental frequency of femtosecond laser radiation.
  ASG-O
(for oscillators)
ASG-A
(for amplifiers)
Possible input wavelength range* 720-1600 nm
Input wavelength tuning range** 50-100 nm
Output wavelength*** 360-800 nm
Input pulse duration >20 fs
Input polarization linear, horizontal
Output polarization linear, vertical
Input average power 0.1-3 W <10 W
Input pulse energy <2 uJ 2 uJ - 10 mJ
Input beam dia at level of 1/е^2 <2 mm <10 mm
Conversion efficiency**** 20-50% 30-50%
Pulse broadening <100 fs
Dimensions 280x140x190 mm
* - may be covered by several exchangeable optics sets, please indicate the desired wavelength range upon your request;
** - typical with one optics set, depends on exact central wavelength and pulse duration;
*** - defined by input wavelength;
**** - defined by input pulse energy and input pulse duration.

Second harmonic generators (SHG) are used for doubling of optical frequency for a wide range of input wavelengths produced by various ultrafast laser sources. The sources may be titanium-sapphire femtosecond lasers (Ti:S, 700-1000 nm), various ultrafast solid-state and fiber lasers around 1030-1064 nm region, chromium-forsterite oscillators (Cr:F, 1230-1270 nm), as well as other ultra-short pulse sources including parametric light conversion systems.  The principle of operation is based on second harmonic generation in a non-linear crystal with phase-matching technique. The units provide stable output radiation with good beam quality and little pulse broadening in fs scale.

The models are subdivided into two main branches: the ASG-O-W for usage with ultrafast oscillators (multi-MHz rep. rates with nJ-level output) and the ASG-A-W with increased input aperture and modified layout for usage with amplifier systems (single-shot to several MHz, uJ- and mJ-level output). The "W" in the model name takes on the exact central wavelength value for a certain model, e.g. the ASG-O-800 (i.e. designed for an oscillator with ~800 nm output).

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