Shih-Yu Tu

Glass-clad Cr4+:YAG crystal fiber for the generation of superwideband amplified spontaneous emission.

Glass-clad Cr4+:YAG crystal fiber is demonstrated by a codrawing laser-heated pedestal growth method. As much as 2.45 mW of superwideband amplified spontaneous emission (ASE) is generated in the optical fiber communication band with a 3-dB width of 240 nm. The simulation indicates that the ASE power could be in excess of 20 dBm for a 5-microm-diameter core at a pump power of 2.5 W.

Monolithic red-green-blue laser light source based on cascaded wavelength conversion in periodically poled stoichiometric lithium tantalate

A compact, pulsed, red, green, and blue laser source based on cascaded quasi-phase-matched wavelength conversion in two periodic superlattices set in tandem in a single stoichiometric LiTaO3 crystal and pumped by a laser source at 532nm is reported. The white light equivalent flux obtained was 80lmper1W input with a green to white light power conversion efficiency of >30%. Unity power conversion is feasible in this monolithic approach.A compact, pulsed, red, green, and blue laser source based on cascaded quasi-phase-matched wavelength conversion in two periodic superlattices set in tandem in a single stoichiometric LiTaO3 crystal and pumped by a laser source at 532nm is reported. The white light equivalent flux obtained was 80lmper1W input with a green to white light power conversion efficiency of >30%. Unity power conversion is feasible in this monolithic approach.

Efficient periodically poled stoichiometric lithium tantalate optical parametric oscillator for the visible to near-infrared region

A compact, efficient optical parametric oscillator (OPO) for the visible to near-infrared region based on periodically poled stoichiometric lithium tantalate pumped by a frequency-doubled multikilohertz Q-switched Nd:YAG laser is demonstrated. Up to 61% photon conversion with a 71% slope efficiency for photon conversion from 532 nm to the signal radiation was measured. We observed that the efficient conversion diminished the potential for photorefractive damage induced by the 532 nm radiation in the crystal and made sustained operation of the OPO device possible.

Green-pumped high-power optical parametric oscillator based on periodically poled MgO-doped stoichiometric LiTaO3.

A high-power 532 nm-pumped multikilohertz nanosecond optical parametric oscillator using a periodically poled 1.0 mol.% MgO-doped stoichiometric lithium tantalate crystal that could be operated from room temperature to 200 degrees C without damage is reported. A broad continuous tuning range from 855 to 1410 nm was achieved within a single domain period. Efficient operation of high peak power and watt level average power with a power conversion of 62.5% was measured. These results show that a high-resolution high average power visible tunable source can be realized.

Broadly tunable ultraviolet light generation in a compact MgO-doped periodically-poled stoichiometric lithium tantalate optical parametric oscillator with a high-Q cavity

A compact tunable UV laser source based on intracavity sum frequency generation in a MgO-doped periodically-poled stoichiometric lithium tantalate optical parametric oscillator is reported. UV output at an approximately 1 mW level of power over the range of 364 to 378 nm with a bandwidth of 0.5 nm was obtained with a crystal that has just one periodically-poled grating period. The full tuning range can be as much as approximately 68 nm, from 324 to 392 nm by varying the crystal temperature from room temperature to 250 degrees C. This will cover nearly the entire UVA range.

A red-green-blue coherent laser source based on quasi-phase-matched cascaded wavelength conversion in periodically poled MgSLT

A compact pulsed RGB laser source based on periodically-poled MgO doped SLT pumped at 532 nm is reported. The operation of the source at near-room temperature and at high temperature is evaluated for optimal performance.

Broadly tunable mW level UV light generated by intracavity SFG in a compact high-Q PPMgSLT OPO

A compact multi-kHz UV source tunable from 363 nm to 378 nm is realized by intracavity SFG in a PPMgSLT OPO. Phase-matched peaks at 334 nm and 370 nm are observed. A full tuning range of ~58 nm is predicted.

Cascaded second order nonlinearity for the generation of blue/green laser using ZnO:PPLN crystal fiber

A novel technique, using cascaded first-order second harmonic generation and third-order sum frequency generation in a ZnO:PPLN crystal fiber, was demonstrated for the generation of tunable blue/green laser from 471.3 nm to 515 nm.

Efficient pulsed optical parametric oscillator in the visible to NIR range with periodically-poled stoichiometric lithium tantalate

We report an efficient 532nm pumped PPSLT OPO. A 69% slope efficiency for photon conversion from visible to near-IR radiation is achieved. The total signal and idler output power is 439mW for 1W input.

Fused-silica-clad Cr:YAG fiber

A low-propagation-loss (< 0.1 dB/cm) fused-silica-clad Cr:YAG fiber is demonstrated and investigated. The simulation shows that more than 0 dBm of amplified spontaneous emission could be generated with a 2-W pump and an 8-/spl mu/m core.