context: However, in such a case, plastic materials are limited and thus it is difficult to select a suitable combination of optical materials of the two optical layers 3 and 4.
answer_0: Furthermore it is quite difficult to improve the wavelength dependency of diffraction efficiency by a combination of two plastic materials.
answer_1: Here, it is quite difficult to improve the wavelength dependency of diffraction efficiency by a combination of two plastic materials.
answer_2: Particularly, it is quite difficult to improve the wavelength dependency of diffraction efficiency by a combination of two plastic materials.
answer_3: On the contrary, it is quite difficult to improve the wavelength dependency of diffraction efficiency by a combination of two plastic materials.
answer_4: Actually, it is quite difficult to improve the wavelength dependency of diffraction efficiency by a combination of two plastic materials.
answer_5: As a result, it is quite difficult to improve the wavelength dependency of diffraction efficiency by a combination of two plastic materials.
answer_6: Significantly, it is quite difficult to improve the wavelength dependency of diffraction efficiency by a combination of two plastic materials.
answer_7: Curiously, it is quite difficult to improve the wavelength dependency of diffraction efficiency by a combination of two plastic materials.
answer_8: Because of this it is quite difficult to improve the wavelength dependency of diffraction efficiency by a combination of two plastic materials.
answer_9: Anyway, it is quite difficult to improve the wavelength dependency of diffraction efficiency by a combination of two plastic materials.