By Brian Henderson, Ralph H. Bartram
This e-book examines the underlying technological know-how and layout of laser fabrics. It emphasizes the foundations of crystal-field engineering and discusses the elemental actual options that confirm laser achieve and nonlinear frequency conversion in optical crystals. Henderson and Bartram increase the predictive services of crystal-field engineering to teach how amendment of the symmetry and composition of optical facilities can enhance laser functionality. additionally they speak about functions of the rules of crystal-field engineering to numerous optical crystals with regards to the performances of laser units. This e-book can be of substantial curiosity to actual, chemical and fabric scientists and to engineers fascinated about the technology and expertise of good kingdom lasers.
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Additional resources for Crystal-Field Engineering of Solid-State Laser Materials
9 shows the temperature tuning characteristics of an LBO OPO pumped using a diode-pumped Nd: YLF laser [Ferguson (1994)]. 8. A resonant enhancement cavity for frequency doubling a Nd:YLF laser [after Ferguson (1994)]. temperatures in the range 400-440 K the OPO device will operate on four different wavelengths. However, at an operational temperature of 460-470 K the OPO works on a single frequency. The output is very stable and the threshold is only 70 mW. Varying the crystal temperature in the range 390 K to 470 K permits continuous tuning from 650nmto2900nm.
31)). Above threshold the population inversion ANt does not grow further: it is 'clamped' at ANt because of the rapidly increasing rate of stimulated emission that builds up in the cavity as the pump rate is increased above threshold. Cavity losses including the transmission (T) of the output coupler increase the threshold power above which the intensity of stimulated emission increases. The threshold power, P th , is where L is the passive cavity loss, hvp is the energy of the pump photons, the A are the cross sections of the pump (p) and laser (1) beams, ac is the cross section for stimulated emission, r is the luminescence life time and rjp is the pump efficiency.
The laser is end-pumped through one of the dielectric mirrors with an appropriate semiconductor diode array. A boule of Nd-YAG of length 200 mm and diameter 100 mm costing around $5000 is sliced into 200 wafers of thickness 500-750 |xm, which are polished, dielectrically coated and then cut into pieces with dimensions « l x l mm 2 . Each tiny crystal is a complete laser cavity and is potentially very cheap. These devices have quite amazing ranges of operational characteristics. They can be operated as tunable CW lasers or as ultrashort pulse lasers with high peak powers and large pulse repetition rates.
Crystal-Field Engineering of Solid-State Laser Materials by Brian Henderson, Ralph H. Bartram