Color center lasers

For such absorption measurements infrared lasers can be used which coincide with vibrational-rotational transitions of the investigated molecules (CO2 laser, CO laser, HF or DF lasers, etc.). Particularly useful are tunable infrared lasers (diode lasers, color-center lasers, or optical parametric oscillators, Vol. 1, Sect. 5.7), which may be tuned to selected transitions. The usefulness of diode lasers has been demonstrated by many examples [1451]. For instance, with a recently-developed automated diode laser spectrometer, which is tuned by computer control through the spectral intervals of interest, up to five atmospheric trace gases can be monitored in unattended operation. Sensitivities down to 50 ppt for NO2 and 300 ppt for NO have been reported [1371]. 

Lasers, Chemical Lasers, Color Center Lasers, Dye Lasers, Free Electron Lasers, Gas Lasers, Nuclear Pumped Lasers, Optical Fiber Lasers, Semiconductor Lasers, Solid State Lasers, Ultrafast Pulse TLchnology Lasers, X-Ray... 

Lasers Lasers, Color Center Lasers, Gas Lasers, Nuclear Pumped... 

In this section we discuss experimental realizations of some tunable lasers, which are of particular relevance for spectroscopic applications. A variety of tuning methods have been developed for different spectral regions, which will be illustrated by several examples. While semiconductor lasers, color-center lasers, and vibronic solid-state lasers are the most widely used tunable... 

Tunable coherent light sources can be realized in different ways. One possibility, which has already been discussed in Sect. 5.5, relies on lasers with a broad gain profile. Wavelength-selecting elements inside the laser resonator restrict laser oscillation to a narrow spectral interval, and the laser wavelength may be continuously tuned across the gain profile by varying the transmission maxima of these elements. Dye lasers, color-center lasers, and excimer lasers are examples of this type of tunable device. 

---