TPL Tripler
Overview of TPL (time plate) Tripler
TPL-Triple using our patented TimePlate technology is a perfect device for tripling and doubling the frequency of pulses from Ti:Sapphire Oscillators. Many features of the TPL Tripler make it the best choice for tripling and doubling input pulses 680-1060nm to 227-353nm and 340-530nm. 
- Single set of optics for input wavelength range 680-1060
- High tripling conversion efficiency up to 20%
- Compact size 30x16x13 (in cm)
- User-Friendly
The tripling, third harmonic generation (THG), processes include: (1) second harmonic generation (SHG) to convert the input pulse ω to 2ω by a SHG crystal: ω+ω=2ω; (2) mixing the ω and 2ω pulses with a THG crystal: ω+2ω =3ω for the third harmonic generation. A time delay line before the THG process is needed for compensating the time delay between the ω and 2ω pulses after the SHG process.
The Time PlateTM Tripler is invented (US patent 5,852,620) to have a new generation of triplers. A Time Plate (TP) consists of a specially designed birefringence crystal to replace the traditional time delay line. In the TP triplers the beam ω and 2ω keep collinear and automatically have the spatial overlap necessary in the THG process. The better spatial and time overlap in the THG process makes the TP triplers to be very user friendly and more reliable.
TPL Tripler Models:
| TPL Tripler-fs | TPL tripler for femtosecond (fs) pulse |
| TPL Tripler-ps | TPL tripler for picosecond (ps) pulse |
| Auto TPL Tripler-fs | Computer Automatically controlled TPL tripler for femtosecond (fs) pulse |
| Auto TPL Tripler-ps | Computer Automatically controlled TPL tripler for picosecond (fs) pulse |
Specifications:
| Input Wavelength range | 680-1060 nm |
| Input polarization | Vertical (or Horizontala) |
| Input pulse energy | <1nJ to 5uJ |
| Outputs | 227-353nm & 340-530nm & 680-1060nm |
| THG (SHG) polarization | Vertical (Horizontal) |
| SHG efficiencyb | Up to 30% |
| THG efficiencyb | Up to 20% |
| Physical dimension | LxWxH: 11.75×6.25×6.50 (in inch) |
| Input beam height | 4 to 5.5 inch adjustable |
| Power supplyc | 100-220V 50-60Hz plug with 15V DC |
| Scan ratec | 10nm/sec |
| Number of auto control axisc | 6 for complete auto control |
| THG sensor | Build in |
| Auto power monitorc | Yes |
| Auto THG power optimizationc | Yes |
a. With a half-wave plate to rotate the polarization to Horizontal. b. Depending on the input laser power and pulse width. c. For auto TPL Tripler only
TPL-Triple model series for Ti:Sapphire Oscillators use our patented TimePlate technology as our other model TPH-Triple series for amplifiers. Many futures of the TPL Tripler make it the best choice for tripling pulses. The TP-tripler outputs both the doubling frequency (second harmonic generation SHG) and the tripling frequecy (third harmanic generation THG). The femtosecond and picosecond SHG and THG pulses covering wavelength 340-530nm and 226-353nm will have many applications.
Time PlateTM in the fs Tripler
So far all other fs triplers use a delay line for time compensation. The delay line consists of two beam splitters (or diachronic mirrors), several mirrors, and a translation stage. It works in three steps:
(1) the separation of two laser beams w and 2w;
(2) the two beams traveling through different path and the time delay between them being adjusted by moving the translation stage;
(3) the recombination of the two beams.
The drawbacks of delay line are that it is complicated, expensive, large size, and very difficult to align.
The Time PlateTM is invented (pdf patent) to overcome the drawbacks of delay line. A Time Plate (TP) consists of a specially designed birefringence crystal. After the SHG stage, a time delay between the two beams w and 2w, which are polarized perpendicularly to each other, is generated. The time delay is compensated after the two beams travel through the time plate since they have different refractive indices no and neff. The delay time is tunable by rotating the angle of the time plate around the z-axis to change the effective index neff. One degree rotation changes the time delay about 10 fs for a 2 mm thick calcite crystal. In the fs triplers, there is no beam separation and re-combination and the beams wand 2w keep collinear so the spetial overlap are automatically achieved. The better method for spatial and time overlap makes the fs triplers to be very user friendly and more reliable.
*Data using a 120fs Mai Tai.
Auto TPL Tripler
The Auto TPL 
doubler is fully computer controllable unit for 680-1060nm input laser wavelength to generate 226-353nm THG pulse as well as 340-530nm doubling output. Change wavelength becomes a simple click of command button. The Auto TPL tripler provides hand-free operation and will benefit many applications needing automatic wavelength change. The Auto TPL tripler will well worth the small increased in cost compared to the manual tripler.
New features in the Auto TPL tripler:
– A build-in THG power sensor
– THG power monitor system to automatically track the THG power
– Auto optimization function to make sure the best performance of the tripler
– Auto compensation unit to have constant output beam position in the whole wavelength range
Auto TPL Tripler controlling program
Auto wavelength scan
The controlling program is complete and user friendly. As shown in the Run page of the controlling program the wavelength can be changed in the input wavelength window or by
moving the track-bar. Type-in a new input wavelength then press the Enter-key or moving the track-bar will start to move the doubler to the new wavelength. It is so simple to change a wavelength.
Auto Tripler Control Panel pdf file
The Control panel gives the detailed description of the controlling program.
