PT Journal AU Siemsen, KJ Bernard, JE Madej, AA Marmet, L TI Absolute frequency measurement of a CO[sub:2]/OsO[sub:4] stabilized laser at 28.8 THz SO Applied Physics B: Lasers and Optics JI Appl. Phys. B: Lasers and Optics PY 2001 BP 567 EP 573 VL 72 DE HgCdTe detector ER