We present an efficient and robust broadband crystal optical conversion device. Various applications of laser optics require tunable laser sources. Currently, most frequency conversion devices rely on a single non-linear crystal, which is either temperature or angle tuned to enhance efficiency. This results only in a narrow efficient spectral band of conversion. Other techniques such as periodic quasi-phase matching result in improved efficiencies but still within a narrow predetermined band. Random quasi-phase matching results in improved bandwidth but in a significant reduction in efficiency. This new device enables ultra-broadband wavelength conversion while maintaining high efficiency.
- Laser optics industry
- Frequency convertor for broadband signals
- Generation of ultrafast visible radiation
- Pulse selection.
- 90% efficiency of conversion process.
- Simple and compact
- Insensitive to the deviations in alignment, no dependence of the angle incidence beam or of temperature
- Frequency converter of both broadband signals and ultra-short pulses.
This device is based on a new method of adiabatic wavelength conversion. The device works whereby a strong narrow-band pump is introduced into the crystal along with a weaker pulse to be converted. This conversion is realized in a quasi-phase matched nonlinear crystal, where the period is tuned adiabatically from strong negative phase-mismatch to strong positive phase-mismatch (or vice versa). This results in the efficient transformation of the weaker pulse.