July 8, 1999

Dr. Nancy T. Kawai

InPhotonics

111 Downey St.

Norwood, MA 02062

Dear Nancy:

I am sorry for the delay in sending these samples to you. Last week we visited the final vendor in our test group, Kaiser Optical, and we wanted to analyze the same samples at all the vendors that we visited. As you and I discussed by e-mail, we are very interested in seeing spectra out in the 3000-4000 wavenumber range, because we only looked out to 3200 wavenumbers during our visit. We also want to see comparison spectra of minerals in air and underwater (using your immersion probe).

Please use your 532 nm (17 mW) laser to take spectra from 200 to 4000 wavenumbers on the following samples, using the sampling configurations noted below. Please use your narrow optical fiber and your highest-resolution data collection (recording every pixel), so that we can get the highest possible spectral resolution. The mineral samples are enclosed here in labeled bags.

1) Spectrum of calcite (CaCO3)

a) in air

b) under water, using immersion probe

2) Actinolite (hydrated Mg-Fe silicate; somewhat fluorescent in the 1500-3000 wavenumber range). We particularly want to view the hydration band at about 3676 cm-1 and to see that band above the broad OH stretch of liquid water.

a) in air

b) under water, using immersion probe

3) Ice--you provide the sample! We particularly want to see the OH bands.

4) Carbon tetrachloride (we left a vial of it with you). We want to see the resolution of the instrument.

We were hoping to write up our instrument-evaluation report for our colleagues in Moneterey by Friday, July 16th. Would it be possible for us to get those spectral datafiles by then? We would appreciate return of the mineral samples when you get a chance.

Thank you again for all of your help.

Sincerely,

Jill Dill Pasteris

Professor of Earth and Planetary Sciences

tel. (314) 935-5434

encl.