I think you may struggle to find what you are after, a lot of the optical stuff can only be calibrated with the OEM manufacturer. I work with laser power meters, mostly made by Ophir which is a subsidiary of Newport, and the company I work for has thousands of the power meters by Ophir and the only place we have been able to get them calibrated is by Ophir themselves as they design in a proprietary calibration procedure, though thats not to say someone could emit a known power light source at the device and record the reading.
If turnaround time at Ophir is anything like the rest of Newport then you are likely looking at weeks or months for turnaround time. Also their calibration is questionable, for example we use 400W laser power meter detectors and Ophir calibrate them at 1 point in each wavelength setting and usually that is in the mW or A few Watts range which is basically almost down in the noise.