Provided are methods and systems for imprinting a pattern formed on surfaces of an imprint mask onto a double-sided substrate. In one embodiment, the method additionally includes generating a compensation signal based on the threshold-adjustment signal, a polarity of the compensation signal being opposite a polarity of the threshold-adjustment signal or the DC offset, a magnitude of the compensation signal being a function of the magnitude of the threshold-adjustment signal. Space division switching is performed in the external cavity between a plurality of optical fibers each having a different Bragg grating. The conductive paste is applied on a glass substrate and then baked to form a conductor film. An amount of outwardly leaked tracer gas, which leaks from the sealed space through the outer sealing portion, is measured with a leak test device.