Diode lasers, wavelength range

Other hand, the spectral range matched well to the diode laser wavelengths (750-850 nm). Thus phthalocyanines are primarily developed as IR photoconductors for diode laser printers. 

The practical use of photochromic dyes as memory layers in erasable and rewritable data storage disks fails not only because of their physical limitations (lacking sensitivity, insufficient stabiHty, low number of cycles), but also because the diode lasers required for switching in the visible range (wavelength between 450 and 600 nm) and the uv-range (around 350 nm) are not available. 

Lasers having wavelengths ranging from the deep uv to the near infrared have been used in Raman spectroscopy. In industrial laboratories, the most common laser is the Nd YAG operating at 1.06 pm. Increasingly, diode lasers or other lasers operating in the 750—785-nm region are encountered. These... 

Subsequent to the advent of the dye laser, tunable lasers based upon other lasing media were developed which operate over various wavelength ranges. Nobable among these are the f-center lasers and diode lasers which are tunable in the infrared. 

Figure 7.1. Wavelengths and available power ranges of commercial lasers commonly used for Raman spectroscopy. Note discontinuity in power axis above 1 W. Diode lasers are available over a range of wavelengths and are to some extent tunable. Numerical details are in Tables 7.1 to 7.4.

---