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TA-FHG pro

High-power, tunable, frequency-quadrupled diode laser

Two resonant frequency doubling stages
SUV and AutoAlign options - unprecedented DUV power & lifetime
PowerLock output power stabilization
With digital control DLC pro: Less drift & linewidth

The TA-FHG pro is a tunable, diode-based laser source in the deep UV spectral range. The system consists of an external cavity diode laser, a high power semiconductor amplifier (TA), and two cascaded second harmonic generation stages (SHG pro). Alternatively, it can be equipped with a fiber amplifier (FA) or Raman fiber amplifier (RFA). For unmatched DUV power and lifetime, it can be equipped with the SUV cavity. It provides tunable laser radiation for spectroscopy, laser cooling, holography and interferometry.

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Specification

Wavelength range *	205 .. 340 nm (with semiconductor amplifier) 244 .. 390 nm (with fiber amplifier)
Seed laser	DL pro, DL DFB
Amplifier	Semiconductor amplifier TA pro or fiber amplifier
Doubling stage	2 x SHG pro (or 1 x SHG pro, 1x SUV)
Coarse tuning	1 .. 10 nm

Additional Information

TA-FHG pro: Available wavelengths and output power

The SUV option allows for unprecedented output power & stability in the DUV range. The figure shows longterm measurements taken with a DLC TA-FHG pro system including the SUV option at different output powers and wavelengths.

TA FHG pro system with tapered amplifier TA pro.

FA-FHG pro system with integrated fiber amplifier.

Options

	SUV A modified FHG cavity design allows for unprecedented DUV output power and stability. Warranty included.
	AutoAlign A modified FHG cavity design allows for unprecedented DUV output power and stability. Warranty included.
	Fiber Delivery Fiber Delivery (FD) is optionally available with TOPTICA's patented fiber coupler FiberDock and a suitable polarization maintaining (PM) fiber. FiberDock provides highest single-mode fiber coupling efficiencies, easy alignment and at the same time highest stability. For most lasers, we specify a PER behind fiber of >20 dB with our Fiber Delivery option. Please also inquire about Long Life and High Power fibers as well as fiber splitters. Optical isolation is mandatory for fiber coupled diode laser systems.
	FiberMon Allows measurement of the SHG output power propagating in a single-mode, polarization-maintaining (SM-PM) fiber for PowerLock and AutoAlign. Two wavelength regions are available.
	EOM An EOM before the doubling cavity allows to independendly create the PDH signal for laser locking. Advantageous for nondisturbed DL pro operation and maximum mode-hop-free tuning range in case of SHG cavity, and significant RIN reduction and suppression of UV sidebands in case of FHG cavity
	Narrow Linewidth The DL pro fundamental master laser is replaced by a narrow-linewidth version. Other master lasers (DFB/DBR) available upon request.
	High Power At certain wavelenghts, high power tapered amplifiers are available. The option includes high-current driving electronics and a high-power capable SHG stage.
	Advanced Locking Various lock options from side-of fringe frequency stabilization to PDH linewidth narrowing available. Modules like DigiLock 110 or PDH/DLC pro can be installed in the DLC ext extension rack, with shortest-possible cable length right next to the laser head. For the most demanding applications you can use the FALC pro (see Laser Locking Electronics).

Applications
- Two photon spectroscopy (e.g. Hydrogen)
- Atom optics: laser cooling & trapping (e.g. Hg, Mg)
- Ion laser cooling & trapping (In+, Mg+, …)
- Metrology (atomic clocks)
- Optics tests in semicon inspection
- Angular resolved photoemission spectroscopy (ARPES)
- Stimulated Raman scattering (SRS)
- Rydberg Excitation (Rydberg Flyer for complete laser solutions)
- Optical Clocks
Downloads
- Product info: TA-FHG pro
- Product Brochure Scientific Lasers (please see website for latest specs!)
- Technical Drawings TA-FHG pro
Literature
- Article: Ulrich Eismann Direct and frequency-converted diode lasers provide all wavelengths for holography, Laser Focus World (2018), German version, Chinese version, Japanese version, French version, French version
- Article: R. Kirner et al., Mask-aligner lithography using a continuous-wave diode laser frequency-quadrupled to 193 nm, Optics Express (2018)
- Article: Active and passive stabilization of a high-power UV frequency-doubled diode laser, CLEO, OSA Technical Digest (Optical Society of America, 2016)
- Article: Short, shorter, shortest: Diode lasers in the deep ultraviolet, Laser Focus World, June 2016
- Article: Kurz, kürzer, am kürzesten, Best of (2015)
- Article: More colors! Diode lasers reach Yellow and Orange, Physics' Best (2013)
- Article: Frequenzkonvertierte cw-Lasersysteme für Forschung und Industrie, Physik Journal (2007)
- Application Note: Phase and Frequency Locking of Diode Lasers
- Application Note: Linewidth Measurement of Diode Lasers
Related Products
- Tunable diode lasers: CTL, DL pro, DFB pro
- Amplified diode lasers: TA pro, BoosTA pro
- Resonant doubling stage: SHG pro
- SodiumStar: 20 W guide star laser system
- Photonicals: Laboratory tools and accessories
- Wavelength Meters and locking modules

Continuous scan range	> 40 GHz
Operation	Single frequency
Linewidth	< 500 kHz
Output power	Up to 3 W
Spatial mode	Near diffraction limited
Optical isolation	Two isolators included (DL and TA)
Beam shaping	Included
Water cooling	Not required, supported
SHG cavity leak rate	< 1E-3 mbar l/s
Control electronics	DLC pro, 19" single-stage rack
Warm-up time	< 5 min typ.
Dimensions laser head (H x W x D)	90 x 410 x 692 mm³
Weight laser head	Up to 30 kg
Dimensions control unit	Single stage 19" rack DLC pro
Weight control unit	Up to 10 kg
Operating voltage	100 .. 120 V / 220 .. 240 V AC, 50 .. 60 Hz (auto detect)
Power consumption	< 150 W typ., 300 W max.
PC Interface	Ethernet, USB, analog control
Environment temperature	15 - 30 °C (operating), 0 - 40 °C (storage and transport)
Environment humidity	Non-condensing