Feedback, distributed

Fig. 12. Cut-out drawing of a distributed feedback (DFB) laser showing the active region and a diffraction grating, under the active layer, which produces...

Fig. 11. Schematic of edge-emitting laser diodes where the arrows represent the direction of laser emission and U represents the active region (a) standard stmcture with cleaved facets for mirrors and (b) distributed feedback (DFB) laser that employs coherent reflection from a grating to generate optical...

J.E. Bjorkholm, C.V. Shank, Higher-order distributed feedback oscillators, Appl. Phys. Leu. 1972, 20. 306. 

Figure 10-15 shows the output vs. input energy relation with a clear threshold at a pump pulse energy of approximately 1.5 nJ. This value is an order of magnitude lower than the threshold for the observation of ASE in simple planar waveguides, i.e. without distributed feedback but prepared with the same conjugated polymer. 

M.D. McGe/iec, M.A. Diaz-Garcia, F. Hide, R. Gupta, E.K. Miller, D. Moses, A.J. Heeger, Semiconducting polymer distributed feedback lasers, Appl. Phyx. Leu. 1998, 72, 1536. 

Ultra-Sensitive Biochemical Optical Detection Using Distributed Feedback Nanolasers... 

To use the OFRR as a biosensing device, the optical resonant mode is excited and the resonant frequency is measured continuously in real time. The conceptual measurement setup is illustrated in Fig. 14.3. Laser light from a distributed feedback (DFB) laser is delivered to the OFRR using fiber optic cable. One method that has been used to excite the resonant modes is to place a tapered fiber optic cable with a diameter less than 4 pm in contact with the OFRR. The evanescent field of the tapered fiber overlaps with the evanescent field outside of the capillary wall, which enables mode coupling between the two media24. 

Gersborg Hansen, M. Kristensen, A., Tunability of optofluidic distributed feedback dye lasers, Opt. Express 2007, 15, 137 142... 

Distributed feedback (DFB) lasers, 22 177 Distributed fiber sensors, 11 152-153 Distribution function, 26 1020 Distributor design, in fluidized beds, 11 810 Distributor grid shroud, 11 813 Distributor jets, 11 812-813 Distributors... 

Figure 3.25. Laser resonators applicable to molecular glasses A = microdroplet, B = microdisk, C = ring laser, D = vertical cavity distributed bragg laser, E = distributed feedback laser, F = random laser.

Details of the laser system and the operating conditions employed to control the lasers have been described previously [6]. The system includes two independently operated distributed feedback (DFB) InGaAsP diode lasers tuned over the desired transitions near 1.34 p,m and 1.39 p,m i/ + I s bands)... 

Fourier transform ion cyclotron resonance mass spectronomy for chemical/biological toxins, distributed feedback fiber laser for SONAR arrays and the CORMORANT (demining) lift bag. 

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