use HR4000 with 0.02nm resolution, borrowed from Todd@WM

When test, the fiber head is direct in laser light

The power setting is nominal power from manufacture, actualy power is about  10% lower

FWHM is around 0.3nm as suggested by manufacturer.

The higher power, the larger wavelength, by about 0.1nm/W

the spectrum is moving within about 0.2nm range during about 10s period.

the peak reaches 794.6 on avergae at 100% I and 794.5 on average at 95% I

Zhiwen on 1/8/2013