We have setup the femtosecond Transient absorption system for nanowires or solution samples. Depending on the sample the pump may be 310 nm, 387 nm or 425 nm and similarly probe is be broadband white light continuum(350 nm-700 nm or 400 nm-750 nm. 

1. How do we know that our setup is working properly and we are getting right time constants? Is there any stable standard samples that we can use? 

2.Is the 1 arcsec retroreflector better option than using 2 mirrors in 4 ns delay stage ?

3. Please give me suggestions to improve my setup. I have attached the block diagram of my setup. 

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