Controlled optical feedback in external cavity diode laser with volume holographic grating

To achieve the maximum output in single-frequency lasing mode it is necessary to minimize losses in the optical system for the output beam and to provide the optimal value of the frequency-selective feedback at the level, sufficient for stable single-frequency mode of operation. In this paper we investigate the scheme of an external cavity diode laser (ECDL) based on phase volume holographic grating (VHG). Angular and spectral selectivity of the holographic grating allows to adjust the feedback levels with low losses in the resonator and can be used to create single-frequency diode laser with high output power. Here the optimal parameters of VHG are estimated and the proposals on VHG design are developed.