Frequency doubler sum-frequency generation, Quasi-CW resonant single frequency

FD-SF-07

Efficient resonant frequency doubler
- up to ultraviolet
- sum-frequency generation
- quasi-CW support

Doubling efficiency (@1Watt input):
950-1100 nm -> 475-550 nm       >20% (>35%)
700-950 nm -> 350-475 nm         >25%
550-700 nm -> 275-350 nm         >20%
488-550 nm -> 244-275 nm         >15%
Linewidth                                        < 1 MHz (< 5 MHz)
The resonant frequency doubler FD-SF-07 provides efficient generation of the second-harmonics up to ultraviolet wavelengthrange of CW single-frequency lasers such as Ti:Sapphire / dye lasers, DPSS lasers (Nd:YVO4, Yb:YAG), fiber lasers (Yb, Er), and others.

FD-SF-07 doubler features improved doubling efficiency and solid ultrastable performance when pumped with frequency-unstabilised lasers or when operated under conditions of high external acoustic perturbations and vibrations.
Frequency doubling of a dye laser to UV wavelength range
Frequency doubler scheme with driver electronics cavitydesign
Rigid and compact ring cavity combined with ultra-fast two-stage system that locks the frequency of the cavity to the frequency of the input radiation are a guarantee for high stability of the output power of the second harmonic.

Optimised resonator in combination with high-quality mirrors and high performance AR coatings of the optical surfaces of the non-linear crystal ensures relatively high level of output second-harmonic power.
Frequency doubler red green ultraviolet opened cover in operation
Following output power is achievable by pumping with 1 W at fundamental radiation:
  • > 200 mW in the range 475-550 nm (@ 950-1100 nm input) (350 mW on demand)
  • > 250 mW in the range 350-475 nm (@ 700-950 nm input)
  • > 200 mW in the range 275-350 nm (@ 550-700 nm input)
  • > 150 mW in the range 244-275 nm (@ 488-550 nm input)
In these conditions the maximum efficiency of conversion of the fundamental radiation into the second harmonics reaches 40% for Ti:Sapphire pump laser and 25% for green DPSS/Yb:YAG pump lasers (532/515 nm) at the output power of these lasers of >=1 W.
The electronic control unit of the "FD-SF-07" doubler comes standard with an additional control photo-detector, the use of which greatly simplifies optimisation of the cavity alignment both for the fundamental and the second harmonic radiation.

Fast two-stage system of locking the cavity to the frequency of input radiation

Possibility of efficient operation with lasers without frequency stabilisation (like TIS-SF-07, DYE-SF-07).
Frequency doubler electronics, driver control unit
NEW

The frequency doubler FD-SF-07 allows not only to generate doubled radiation, but also the generation of sum-frequency is now possible. As an example now the sum frequency generation of following combination is possible:

Input 1: 532 nm (Mozart 532)
Input 2: 690 - 1025 nm, 1,5 W (TIS-SF-07)
Output: 300 - 350 nm, up to 50 mW and more

To reach this the frequency doubler controls the line of the Ti:Sapphire laser and fits it to the own resonant frequency.

There is also the possibility to double quasi-CW laser radiation. The structure of the doubler is designed in such way, that the length of the doubler resonanor is being adapted to the repetition rate of the fundamental radiation.
FEATURES

Efficient

Improved doubling efficiency up to 40%

Ultra-stable performance

even under conditions of considerable external vibro-acoustic pertubations

Temperature stabilized

The Non-Linear-Crystal (NLO) is temperature stabilized and ensures optimal efficiency

Easy

Easily removable cover and accessible components for initial adjustment

Ultra-fast

Fast system of locking the cavity to the frequency of input radiation

High power enhancement factor

> 130