Lower order blaze grating spectrometer of large diffraction angle

A new kind of large dispersion lower order blaze grating spectrometer is bu ilt. The design is based on the use of uncustomary large angles of incidenc e and diffraction approaching 80 degrees. The double diffraction optical sc heme is employed to fit the design conception. A set of compact size gratin g spectrometers of various focal lengths and grating ruled widths has been manufactured and explored. The measured grating efficiency related to diffe rent blaze angles shows the evidence for the instrument gainful operation. The spectrometer imaging properties are much promising to enable a fine spe ctral resolution to 0.005 nm under a short focal length similar to 100 mm. The estimation of flux luminosity is made in comparison with Fabry-Perot in terferometer. (C) 1999 American Institute of Physics. [S0034-6748(99)02710- 0].