Broadly Tunable Picosecond Laser



Picosecond Laser Tunable, One-box, with Multi-Color Output


Picosecond Laser Broadly Tunable

The picosecond laser picoEmerald emits ultra-short pulses with a duration of 2 picoseconds (other durations possible). The wavelength tuning of the ps laser is fully automated across a tuning range of 700 to 990 nm (Signal) and 1080 to 1950 nm (Idler). The fundamental beam at 1032 nm is also available. A wavelength scan / sweep function for fast spectra acquisition over certain specific wavelengths is included.

The key-facts of the picoEmerald are:

  • Wavelength 1 IR beam 1032 nm
  • Wavelength 2 tunable 700 … 990 nm
  • Wavelength 3 tunable 1080 … 1950 nm
  • Temporal and spatial overlap of the output wavelengths
  • Integrated time-delay between the wavelengths
  • A common output port for all beams
  • Fully automated wavelength tuning
  • EOM optionally integrated

picoEmerald provides ultra-short picosecond laser pulses with a pulse repetition rate of 80 MHz. A picosecond laser version with a high-repetition rate of 320 MHz has already been demonstrated in a customer-specific setup.

Faster Achievements with a Single Output Port

With the picosecond laser picoEmerald, Idler and Signal beams and the IR beam (1 µm from the pump laser) are designed to come from one and the same output. They are perfectly overlapping in space and time. Therefore, there is no need for the user to use additional optics to guide the different beams into one location.

Users often want to use the entire wavelength range provided by the IR beam and the Signal and Idler output. Some applications, such as Coherent Raman Spectroscopy, even require the different beams being spatially and temporally overlapped. The difficulty with most laser systems is that IR, Signal and Idler beam come from different outputs. The different beams can therefore not easily be coupled into one and the same experiment. With the common single output port of the picoEmerald, the user has the certainty and comfort of not having to create their own beam path for the individual beams.

The picoEmerald has an integrated delay management (GDD dispersion compensated output). This allows the perfect adjustment of the time delay between the IR and the Signal beam even for external optics, in order to deal with dispersion differences at the different wavelengths. Each time the picoEmerald picosecond laser is tuned to a new Signal wavelength the delay of the IR beam is adjusted automatically for achieving a temporal overlap between Signal and IR pulse either at the output port or at an external experiment position.

Outstanding Reliability

All optical modules of the tunable picosecond laser picoEmerald were optimized by finite element analysis and mechanical stability algorithms (misalignment stability optimization). This ensures maximum mechanical stability. In addition, active cavity control continuously maximizes the efficiency of the high-performance picosecond laser oscillator and the integrated optical parametric oscillator. The picoEmerald is supplied with an internal closed-loop chiller to ensure stable operation. A panel PC with pre-installed control software and a user interface are part of the delivery. The picoEmerald is designed to be a “hands-free” unit. It is not necessary for the user to interact with the laser except via the software interface.

Narrow Bandwidth with Picosecond Pulses

picoEmerald allows for the efficient generation of tunable narrow-bandwidth picosecond pulses. The narrow bandwidth of the picosecond laser compared to femtosecond laser is beneficial to perform resonance-specific and vibrational mode-specific excitation experiments. This is due to the reason that most vibrational bands (or cross-sections) in the spectral region of interest tend to have only a few wave numbers of bandwidth. With a pulse duration of 2 ps, picoEmerald is therefore ideally suited for many spectroscopy applications and experiments.

If even narrower bandwidths are required, the picoEmerald can be combined with a spectrum slicer. The main task of the pulseSlicer from APE is to cut out a very narrow spectral part of the picosecond laser pulse. This function is comparable to a monochromator or bandpass filter.

Options

Several options regarding the configuration of the picosecond laser are available:

  • A power version of > 700 mW (at 1032 nm)
  • An elevated power version of > 2 W (at 1032 nm)
  • A long pulse version with 3.5 ps instead of 2 ps
  • An elevated power version of > 2 W (at 1032 nm) with an additional IR output port > 4 W (at 1032 nm)

CARS & SRS

picoEmerald provides fully automated temporal- and spatial-overlapping ultra-short pulse trains, perfectly suited for CARS & SRS.

Quantum Dot Single-Photon Generation

The combination of the tunable picosecond laser picoEmerald and the spectrum slicer (laser monochomator) pulseSlicer supports customers in the field of quantum research.

Transient Absorption Microscopy

Transient absorption microscopy (TAM) with a tunable multi-color picosecond laser, with two collinear aligned wavelengths.

Application Examples Picosecond Laser

Specifications

Additional Features

picoEmerald ps Laser Scource  
Main Parameters
Type of SourceAutomated picosecond (narrow-band) tunable light source
Wavelength 1 1032 nm Beam1032 ± 1.5 nm
Wavelength 2 OPO Signal700 ... 990 nm
Wavelength 3 OPO Idler1080 ... 1950 nm
Power 1 1032 nm Beam> 700 mW,
> 2 W (Optionally)
Power 2 OPO Signal> 700 mW at 800 nm
Power 3 OPO Idler> 400 mW at 1250 nm
Power 4 Additional IR Port (Option)> 4 W at 1032 nm
(Only in combination with Power 1 1032 nm Beam > 2 W)
Δ OPO Signal - OPO Idler800 ... 9000 cm-1
Δ OPO Signal - Fundamental400 ... 4500 cm-1
Pulse Width2 ps,
3.5 ps (Optionally; Spectral bandwidth for OPO Signal is 6 cm-1; Power levels decreased for Signal and Idler compared to 2 ps configuration)
Repetition Rate80 MHz
Spectral Bandwidth Signal, 1032 nm beam10 cm-1
Beam
Beam DiagnosticsIntegrated for Signal Wavelength, Power, Bandwidth, Beam position, Temporal overlap
Pointing Stability< 100 µrad per 100 nm
M2< 1.2 (OPO Idler and Signal), typ. 1.2 (1032 nm beam)
Ellipticity< 10 %
PolarizationLinear; Horizontal > 100:1
Beam Divergence1.0 (± 0.2) mrad (at 800 and 1032 nm)
Beam Waist Diameter1.2 (± 0.2) mm at 800 nm; 1.7 (± 0.2) mm at 1032 nm
Software
Software and AutomationIncluded
Wavelength Sweep FunctionStart/End Function, User-defined Holding Time, Trigger Function, max. 2 nm step size,
approx. 5 s per wavelength step
Remote ControlPossible via USB / Ethernet TCP/IP / Serial RS232
Options
SRS Detection Set (Optional)Unique Lock-In Amplifier & Detector Combination

Sensor: 10 mm x 10 mm active area; 340 ... 1100 nm spectral response

Lock-In Amplifier: 8 MHz ... 20 MHz; Time constants: 100 ns, 300 ns, 2 μs, 10 μs, 20 μs;
Typ. Sensitivity: Δ I/I = 5 x 10-7 for 20 μs integration time (at 50 mW / 800 nm)
SRS Modulator EOM (Optional)EOM with a resonant fixed frequency of 10 MHz (or 20 MHz) modulation frequency;
Built into picoEmerald
  • Tunable picosecond laser
  • Wavelength scan / sweep function for fast spectra acquisition
  • Independent power control for 1032 nm beam and Signal beam
  • Automated optical delay management for dispersion compensation
  • Remote-service via LAN interface
  • Optional: Wavelength extension from 210 nm – 10 μm
    (Realized by SHG, THG, FHG, or DFG; e.g. APE’s HarmoniXX)

Above: Typical Signal and Idler power vs. wavelength

Above: Relative intensity noise (RIN): Shot noise limited OPO Signal output for frequencies > 10 MHz


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