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Large size scanning mirrors are available to avoid the aberrations from the reduction and the expansion processes, but scanning with them is slow. In addition, the use of larger mirrors also results in larger physical separation between the [https://en.wikipedia.org/wiki/Bepotastine bepotastine] x-axis scanning mirror and y-axis scanning mirror resulting in greater non-uniformity of excitation over the FOV.25 Figure ?Figure22 shows the schematic of the new, non-descanned MMM with MAPMT. The scanning mirrors are positioned before the DOE. In this configuration the excitation beam can be expanded gradually with two 4-f beam expanders corresponding to lens pairs of L1 (Eyepiece E-PL 10x/20, Zeiss, Thornwood, NY) and L2 (f 100 mm, doublet, AC508-100-B-ML, Thorlabs, Newton, NJ), and L3 (f 200 mm, doublet, AC508-200-B-ML, Thorlabs, Newton, NJ) and L4 (f 300 mm, singlet, KPX232AR.16, Newport, Irvine, CA). This arrangement improves the overall f-numbers of the intermediate optics and minimizes the aberrations. After the lens L2, [http://www.selleckchem.com/products/Y-27632.html selleck inhibitor] the scanned laser beam enters the DOE with various angles of incidence (AOI). Within a small range of AOI (in our design ��0.4?��), the performance of the DOE was consistent. The dichroic mirror is located at the mirror position between lens L4 and the objective lens so that the emission photons reach the MAPMT with a shorter path length (500 mm versus 872 mm of the descanned configuration in Fig ?Fig1).1). The same IR blocking filter (BG39, Chroma Technology, Bellows Falls, VT) and the short-pass filter (ET680sp-2p, Chroma Technology, Bellows Falls, VT) are installed before the MAPMT to block the excitation light. Figure ?Figure33 shows the f-numbers of our two MMM systems optimized for each descanned and non-descanned case using commercially available lenses. FIG. 2. The schematic of MMM system with non-descanned detection. FIG. 3. The f-numbers of Lens L1, L2, L3, and L4 in the descanned and non-descanned MMM. The four lenses in each case were optimized to utilize the full FOV of the 20�� objective lens (FOV: 1 [http://www.selleckchem.com/products/AZD2281(Olaparib).html Olaparib price] mm diameter at a sample plane), which provides about 700 ��m �� 700 ��m scanning area. The lenses that have lower f-numbers generate dominant aberrations for the final PSF at the sample plane. Generally, if the f-number is smaller than 10, a doublet or more complex compound lens should be used, instead of a singlet, to minimize aberrations.26,27 The descanned MMM design contains two low f-number doublet lenses before and after the scanning mirrors (L2 and L3), but their f-numbers improves from about 2 in the descanned configuration to over 5 in the non-descanned configuration. The f-number of the lens L1 is slightly decreased, but it is a theta lens that can be normally used as a scan lens and can afford a slightly lower f-number of 5.9. D.