Widely tunable frequency conversion in monolithic semiconductor waveguides at 24  μm

Abstract

We report on the generation of continuous-wave widely tunable light between 2360 and 2530 nm using difference-frequency generation with a pump tuned between 938 and 952 nm and a signal tuned between 1490 and 1590 nm in a type-II phase-matched monolithic semiconductor waveguide. The device internal conversion efficiency is estimated to be 0.29% W(-1) cm(-2). This design which uses a single-sided Bragg reflection waveguide has the potential for on-chip spectroscopy, as well as environmental monitoring applications, where a tunable source of coherent radiation tuned between 2 and 3 μm wavelength is desired.

Monolithic semiconductor chips as a source for broadband wavelength-multiplexed polarization entangled photons

“…BRWs have been extensively studied in the past few year for classical wavelength conversions [21,22] and entangled photon pair generations [16,17,23]. The two distinct guiding mechanisms involved provide a great design flexibility in achieving phase matching near the bandgap of semiconductors where formidable material dispersion exists, as well as in generating photon pairs with particulate quantum properties, such as entanglement [23][24][25] and spectral separability [26].…”

Quasi-phase matched difference frequency generation in corrugation-reduced GaAs/AlGaAs periodically-inverted waveguides

“…In addition, Bragg mode phase matching was proposed but only a low DFG conversion efficiency for DFG around 2.4 μm was realized. 13,14) Modal phase matching with modulating the lateral nonlinear optical coefficient, i.e. the introduction of inversion stacked structure, was proposed, 15,16) but no experimental demonstration was reported to date.…”

Broadband frequency conversion via adiabatically tapered $χ^{(2)}$ waveguide in photonic integrated circuits

“…Over last decades, there has been growing interests in the study of nonlinear optical processes in a photonic integrated circuit (PIC), in which the optical fields are tightly confined and the nonlinear effects are greatly enhanced [1][2][3][4][5][6][7][8][9]. Various applications based on χ (2) or χ (3) nonlinearities have been demonstrated, ranging from frequency conversion, frequency comb, super-continuum generation, parametric oscillation to quantum photon sources [10][11][12][13][14][15][16][17][18]. Among these applications, coherent conversion between the signals at different frequencies is of great use, since the bandwidth of information processing would be extended by frequency multiplexing, thus allowing the hybridization of different systems [19][20][21][22].…”