I have a laser with a spectral bandwidth of 19nm and is linearly chirped. The Fourier transform limit is ~82fs assuming a Gaussian profile. I have built a pulse compressor based on the available transmission grating (1000 lines/mm, see the attachment); however, I noticed that the minimum achievable dispersion (further decrease in dispersion is limited by the distance between the grating and horizontal prism) of the compressor is greater than what is required for the optimal pulse compression supported by the optical bandwidth. Is there a way to decrease dispersion further in this setup? or Are there any other compressor configurations using single-transmission grating which might have more flexible dispersion control?
Perhaps bulk materials could be used to compensate the additional negative dispersion of the compressor. Another way is to use a transmission grating with different line density.
I think it possible to use only one prizm (grating double pass scheme): you can to decrease twice the dispertion
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