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Features & Applications

FEATURES

690 – 3400 nm tuning range
Optional tuning range extension to UV
Nearly Fourier transform-limited linewidth
Nearly diffraction limited divergence
Up to 5 kW pulse peak power
Collinear output of two tunable wavelengths for CARS applications (optional)
Output wavelength monitoring (optional)
PC control via USB (RS232 is optional) and LabView™ drivers

APPLICATIONS

CARS microscopy and spectroscopy
Two-photon fluorescence microscopy
Second harmonic generation microscopy
Laser induced fluorescence microscopy
Infrared spectroscopy

Description

PT200 series laser systems integrate a picosecond optical parametric oscillator and DPSS pump laser into a single compact housing. Mounting the components into one frame provides a cost-effective and robust solution with improved long-term stability and reduced maintenance costs.

The MHz pulse repetition rate enables the photon-counting detection method in numerous non‑linear spectroscopy and microscopy applications.

PT257 and PT259 are targeted for CARS and two photon fluorescence applications. The tuning range of PT257 and PT259 supports Raman shift measurements in the 1000 – 4000 cm⁻¹ range. An optional second harmonic generator extends the PT259 tuning range to UV, enabling time‑resolved laser-induced fluorescence measurements. The PT277 model produces approximately 0.5 W power in mid‑IR range from 2500 to 3400 nm with nearly Fourier transform limited linewidth. Applications include infrared spectroscopy and vibrational spectroscopy on surfaces.

All models produce nearly diffraction limited divergence beams, with M² measured as <1.3 over the tuning range.

The microprocessor-controlled wavelength tuning is fully automatic. The wavelength controlling elements are mounted on precise micro‑stepping motors. The temperature of the non‑linear crystal is controlled by a precise thermocontroller with a bidirectional Peltier element, resulting in the fast tuning of crystal temperature. The lasers may be controlled from a remote keypad or via USB (RS232 is optional) interface from a personal computer using LabView™ drivers.

Available models

PT259	1 MHz pulse repetition rate, >25 mW power at 800 nm, 7 ps pulse duration
PT257	87 MHz pulse repetition rate, >400 mW power at 800 nm, <7 ps pulse duration
PT277	87 MHz pulse repetition rate, nearly Fourier transform limited (<0.3 cm⁻¹) linewidth, 70 ps pulse duration

Specifications

Model	PT259	PT257	PT277
OPO/OPG specifications ¹⁾
Pulse repetition rate ²⁾	1 MHz	87 MHz	87 MHz
Tuning range
Signal	700 – 1000 nm ³⁾	690 – 1000 nm	1550 – 2020 nm
Idler	1150 – 2200 nm		2250 – 3400 nm
SH (optional)	350 – 500 nm	–	–
Output power⁴⁾
OPO/OPG ⁵⁾	25 mW	400 mW	300 mW
SH ⁶⁾	1 mW	–	–
Linewidth ⁵⁾	< 8 cm^-1	< 7 cm^-1	< 0.3 cm^-1
Typical pulse duration ^{5) 7)}	7 ps	< 7 ps	70 ps
Typical time bandwidth product	< 0.8
Scanning step
Signal	0.1 nm
Idler	1 nm
SH	0.05 nm	–	–
Polarization
Signal beam	horizontal
Idler beam	horizontal
SH	vertical	–	–
Typical beam diameter^{5) 8)}	2 mm	~4.5 mm	2 mm
Typical beam divergence ^{5) 9)}	< 2 mrad
M²	< 2 ¹⁰⁾	< 2 ¹⁰⁾	-
Pump laser ¹¹⁾
Pump wavelength	532 nm	532 nm	1064 nm
Max. pump power ¹²⁾	0.45 W	3 W	5 W
Pulse repetition rate	1 MHz	87 MHz	87 MHz
Pulse duration ¹³⁾	< 10 ps		80 – 100 ps
Beam quality	Gaussian > 90 % fit
Beam divergence ⁹⁾	< 2 mrad
Physical characteristics
Unit size (W×L×H)	455×1220×260 mm	330×735×175 mm	455×1220×260 mm
Power supply size (W×L×H)	365×395×290 mm	555×525×530 mm
Umbilical length	2 m
Operating requirements
Cooling	air
Room temperature	22 ± 2 °C
Relative humidity	20 – 80 % (noncondensing)
Power requirements	100 – 240 V AC, single phase 50/60 Hz
Power consumption	< 1 kVA

1) Due to continuous improvement, all specifications are subject to change without notice. Parameters marked ‘typical’ are indications of typical performance (not specifications) and will vary with each unit we manufacture. Unless stated otherwise, all specifications are measured at 1064 nm.
2) Inquire for custom pulse repetition rates.
3) Tuning range extension to 620 nm is optional.
4) Output powers are specified at selected wavelengths. See typical tuning curves for power at other wavelengths.
5) Measured at 800 nm for PT25x models, and at 1620 nm for PT277 model.
6) Measured at 400 nm.
7) Pulse duration can vary depending on wavelength and pump energy.
8) Beam diameter at the 1/e² level and can vary depending on the pump pulse energy.
9) Full angle measured at the FWHM level.
10) Specified only for signal output.
11) Separate output port for the pump beam is standard. Output ports for other available harmonics are optional.
12) Data represents typical values. Laser output will be optimised for OPO operation and specification may vary with each unit we manufacture.
13) Measured at 1064 nm.

Performance & Drawings

Typical output power of PT257 tunable laser. The power is shown only at the wavelengths where ambient air absorption is negligible

Typical output power of PT259 tunable laser

Typical output power of PT277 tunable laser. The power is shown only at the wavelengths where ambient air absorption is negliglible

E-CARS, F-CARS, P-CARS spectra of a polystyrene bead (1.1 µm in diameter) measured with PT259 laser. The average pump and Stokes powers were 0.26 mW and 0.6 mW, respectively

External dimensions of PT200 series lasers