Dichroic beam splitters

Figure 2. Transmittance spectral profile of a coating consisting of a quarterwave stack of 23 layer stack centered on 800 nm. Light gray without ripple control. Dark gray with ripple control. It can be used either as a intermediate band filter, or a shortwave dichroic beam splitter or a longwave one.

Figure 4.6 Block diagram of the apparatus for the fluorescence depolarization measurement. The dashed and solid arrows indicate the light paths ofthe excitation pulse and the fluorescence from the sample. OBJ microscope objective, M mirror, L lens, DM dichroic mirror, LP long-pass filter, PH pin-hole, PBS polarizing beam splitter, P polarizer, PMT photomultiplier.

In this case, the excitation and emission filters and dichroic mirror used with the sample are removed and replaced with a beam splitter [3, 36], A scattering solution is placed on the microscope and a... 

Dual wavelength imaging imaging at two wavelengths simultaneously means that there will be two separate arrays of detectors fed via a dichroic beam splitter. 

Dichroic mirror (or so called chromatic beam-splitter) reflects wavelengths of light below the transition wavelength value and transmits wavelengths above this value. 

FIGURE 5.8 (a) CARS energy diagram, (b) Experimental setup BS, 15% beam splitter VA, variable attenuator A/2, half-waveplate Dl, 950 nm longpass dichroic mirror D2, 750 nm longpass dichroic mirror F, three 670 nm bandpass filters LI, aspheric lens L2, 10 cm concave lens. 

FIGURE 10.10 An experimental system of tip-enhanced CARS microscopy. See the text for detail. ND nentral-density filter, P polarizer, DM dichroic mirror, BE beam expander, BS beam splitter, APD avalanche photo diode. 

Figure 2. A typical experimental arrangement for measuring CARS spectra. FD denotes frequency doubler, KG3 is a 1.06-pm absorbing filter, L is for lens, g is a grating, DC is a dye cell, D is a dichroic beam splitter, m is a mirror, and P is a prism (9).

Figure 1.9. The optical parametric amplifier (OPA). BS, beam splitter TFP, thin-film polarizer HWP, half-wave plate IMP, dichroic beam splitter or long wave pass filter F,...

Figure 10. Optical configuration for differentially arranged, thermal lens detected CD. P, beam steering prism M, beam steering mirror BS, polarizing beam splitter HR, half-wave rhomb QR, quarter-wave rhomb L, focusing lens DM, dichroic mirror C, converging sample cell (before probe focus) D, diverging sample cell (after probe focus) PD, aperture/photodiode combination LF, line filter (to isolate the probe laser from extraneous pump radiation). Solid line, probe laser optical path broken line, pump beam path.

In the epi-illumination method, a dichroic beam splitter comprises two parts one acting as an excitation filter and the second as an emission filter (Figure 16.6). 

A dichroic beam splitter separates the reflected spectrum into a portion near the resonance and a portion away from the resonance and directs the portions to two separate photodiodes. The electronic ratio of these two signals cancels most of the fiber transmission noise and provides a stable hydrogen signal. 

Figure 3.6-10 Schematic diagram of a femtosecond time-resolved CARS apparatus. YAG, cw mode-locked Nd YAG laser ML, mode locker PL, polarizer A s, apertures LP, laser pot DM, dichroic mirror DLl, femtosecond dye laser SA, saturable absorber CLFB, cavity-length feedback system DL2, picosecond dye laser W, tuning wedge E, etalon FD, fixed delay VD, variable delay BS, beam splitter P s, half-wave plates (when necessary) F s, filters S, sample MC, monochromator PMT, cooled photomultiplier. (Okamoto and Yoshihara, 1990).

Fig. 4.10. First confocal epi-iUumination microscope with dichroic mirror and beam splitter with two RCA avalange photodiodes and identical cutoff filters. Building year 1988 and still in use...

The infrared and green pulses are subsequently separated by a dichroic beam splitter. The infrared pulses travel directly to the ultrafast optical kerr effect shutter (24) while the green pulses are diverted through an optical delay line which consists of one movable and two fixed prisms. The shutter consists of a cell of carbon disulfide placed between two crossed polarizers,... 

Fig. 1. Experimental setup of the ultrafast confocal microscope. BS1 and BS3 are 50% beam splitters, while BS2 is a dichroic beam splitter. SHG second harmonic generation crystal OBJ microscope objective PZT piezo translator PMT photomultiplier IF interference filter.

---