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BBO crystal is your go-to for this due to its very broad transmission range
(190-3500nm approx). You can get such crystals custom cut and
anti-reflection or basic p-coated (waterproofing protective coating) from
many vendors. Note the cut angle has to be optimized for your working
wavelength range to get useful SHG. Luckily this is more forgiving at
longer wavelengths so you should be able to get one crystal for that whole
range. Generally you want a crystal around a couple hundred microns thick
for femtosecond pulses. If you really care about pulse dispersion
(shouldn't matter for just measuring spectrum) you can get ultrathin
crystals that are 10um thick, although this costs you a lot of signal. Also
don't forget a long-pass filter to remove your residual fundamental. I
recommend a dichroic so you can deflect your strong fundamental safely into
a beam dump so nothing gets burned.
Craig
On Tue, Jul 19, 2016 at 5:03 PM, S. Hou <
[hidden email]> wrote:
> *****
> To join, leave or search the confocal microscopy listserv, go to:
>
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy> Post images on
http://www.imgur.com and include the link in your posting.
> *****
>
> Hi everyone, we have an OPO from Spectra Physics (OPAL) which we are
> pumping with a Ti-Sapphire laser. We would like to measure and calibrate
> the output spectrum of the OPO (1300 nm - 1600 nm) as we recently replaced
> the nonlinear cystal. Does anyone know what our best options might be? We
> were thinking there may be a cheaper option using a doubling crstal and
> then using a visible-NIR spectrometer (which we have access to). Has anyone
> tried something like this? Otherwise, are there any spectrometers for this
> wavelength range that people can recommend?
>
> Thanks,
> Steve
>
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