Generation of terahertz optical beating from a simultaneously self-mode-locked Nd:YAG laser at 1064 and 1123 nm

Continuous wave dual-wavelength Nd:YVO4 laser at 1342 and 1525 nm for generating a 714-nm emission

Continuous wave dual-wavelength lasers at 1342 and 1525 nm are developed by using separate Nd:YVO₄ and YVO₄ crystals to form compactly coupled cavities for fundamental and Raman waves, respectively. The design of the coupled cavity not only reduces the thermal lensing effect in the Nd:YVO₄ crystal, but also improves the stimulated Raman scattering (SRS) efficiency in the undoped YVO₄ crystal. In addition, the Raman crystal is coated to form a highly reflective mirror to minimize cavity losses. By using a plano-concave cavity with a pump power of 40 W, the output powers of the fundamental and Raman waves are 470 mW and 310 mW, respectively. Changed to a concave cavity, the output powers of fundamental and Raman waves are 220 mW and 510 mW, respectively. Basis on the dual-wavelength operation, the maximum output power at 714 nm can reach 2.0 W via the sum frequency generation. A light source at 714 nm can be used for laser spectroscopy of atomic and ionic radium isotopes.

Efficient high-power dual-wavelength lime-green Nd:YVO4 lasers

An efficient high-power dual-wavelength lime-green Nd:YVO₄ self-Raman laser is inventively developed by using two different lithium triborate (LBO) crystals. The first and second LBO crystals are employed to generate the 559 nm lime and 532 nm green lasers, respectively. The temperature of the first LBO crystal is fixed at the optimal phase matching, whereas the temperature of the second LBO crystal is tuned to flexibly control the relative strengths between the 532 and 559 nm waves. When the temperature of the second LBO crystal is set for the maximal total output power, the 532 and 559 nm output powers, respectively, are 7.1 and 2.9 W at a pump power of 31.6 W, corresponding to a conversion efficiency of 31.6%. When the temperature is controlled for the balanced output, the 532 and 559 nm powers, respectively, are 4.3 and 4.2 W at a pump power of 31.6 W, corresponding to a conversion efficiency of 26.9%.

Frequency-tunable photonic frequency synthesis from an optical frequency comb reference

We present an architecture for photonic-assisted RF signal synthesization that uses as a reference the optical repetition frequency of an optical frequency comb. The setup, which is based on a multiharmonic photonic phase frequency detector, enables a perfect phase-locking of a voltage-controlled oscillator to multiples and submultiples of the repetition frequency of the reference comb, operating hence as an optically referenced phase-locked frequency-tunable synthesizer. The design of the system, which is also capable of operating with RF reference inputs, is very well suited for highly stable signal generation and optical clock distribution networks, as signal synthesization is performed directly from the provided optical reference.

Dual-wavelength synchronously mode-locked Nd:LaGGG laser operating at 1.3 μm with a SESAM

A diode-end-pumped synchronously dual-wavelength mode-locked Nd:LaGGG laser operating at 1.3 μm with a semiconductor saturable absorber mirror was demonstrated for the first time.