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1.
Narrow bandwidth operation of high-power broad-area diode laser using cascaded phase-conjugate injection locking 总被引:1,自引:0,他引:1
H. Horiuchi T. Shimura T. Omatsu O. Matoba K. Kuroda 《Applied physics. B, Lasers and optics》1999,68(5):1021-1025
A broad-area laser is injection-locked by another broad-area laser that is also injection-locked by a single-mode diode laser.
Two double-phase conjugate mirrors of photorefractive BaTaO3 are used to couple the master laser beams to the first slave laser, and the first slave laser output to the second slave
laser. One of the double-phase conjugate mirrors is built up with the beams from two broad-area lasers. Two slave lasers are
oscillating in single longitudinal mode at 808.5 nm and the spectral width is the same as that of the master laser. Final
single-mode output power from the second slave broad-area laser is 840 mW, which is limited by the power of the injection
beam. This work verifies the possibility of the multi-stage cascaded injection locking of high-power diode lasers with phase-conjugate
injection.
Received: 18 November 1998 / Revised version: 29 January 1999 / Published online: 7 April 1999 相似文献
2.
V. Krylov J. Gallus U.P. Wild A. Kalintsev A. Rebane 《Applied physics. B, Lasers and optics》2000,70(2):163-168
Measurements of intensity and frequency noise of an injection-locked 5-W Nd:YAG laser are presented and compared with the
predictions of models. We show that the output of the injection-locked laser has very low levels of noise, and that the measurements
support the predictions of the models. Thus these models can confidently be used to predict the performance of high-power,
injection-locked lasers being developed for gravity wave detection.
Received: 31 January 2000 / Revised version: 18 March 2000 / Published online: 16 June 2000 相似文献
3.
Amplitude and frequency stability of an injection-locked diode-pumped miniature Nd:YAG ring laser were measured. The mechanism of amplitude-noise transfer to the injection-locked slave laser was experimentally investigated and consequences for the injection locking of solid-state lasers operating at high output powers are discussed. 相似文献
4.
In this paper, we investigate modulation transfer in an injection-locked diode laser when the master laser frequency or intensity is modulated. The modulation transfer properties of injection-locked diode lasers are shown to depend on frequency detuning between the master and slave lasers. This observation is of practical importance, since the laser frequencies are typically prone to ambient conditions. Also conversion of the master laser frequency modulation to slave laser intensity modulation is shown to be of importance if large frequency modulation amplitudes and small intensity modulation amplitudes of the master laser are used. On the other hand, the injection-locking technique is proved to be an effective way to suppress spurious intensity modulation in certain operational conditions. 相似文献
5.
Sin Hyuk Yim Sang-Bum Lee Taeg Yong Kwon Sang Eon Park 《Applied physics. B, Lasers and optics》2014,115(4):491-495
We present a phase coherent laser system with ultra-low phase noise with a frequency difference of 6.9 GHz. The laser system consists of two extended-cavity diode lasers that are optically phase-locked with electrical feedback to the injection current of a slave laser. The bandwidth of the optical phase-locking loop is extended up to 8 MHz. We achieve the residual phase noise of two phase-locked lasers of below ?120 dBrad2/Hz in the offset frequency range of 100 Hz–350 kHz and a flat phase noise of ?127 dBrad2/Hz from 700 Hz to 20 kHz. These results are, to the best of our knowledge, the lowest phase noise level ever reported with two extended-cavity diode lasers. 相似文献
6.
J. Wang S.T. Sanders J.B. Jeffries R.K. Hanson 《Applied physics. B, Lasers and optics》2001,72(7):865-872
Measurements of oxygen concentration at high pressures (to 10.9 bar) were made using diode-laser absorption of oxygen A-band
transitions near 760 nm. The wide current-tuning frequency range (>30 cm-1) of vertical cavity surface-emitting lasers (VCSELs) was exploited to enable the first scanned-wavelength demonstration of
diode-laser absorption at high pressures; this strategy is more robust than fixed-wavelength strategies, particularly in hostile
environments. The wide tuning range and rapid frequency response of the current tuning were further exploited to demonstrate
wavelength-modulation absorption spectroscopy in a high-pressure environment. The minimum detectable absorbance demonstrated,
∼1×10-4, corresponds to ∼800 ppm-m oxygen detectivity at room temperature and is limited by etalon noise. The rapid- and wide-frequency
tunability of VCSELs should significantly expand the application domain of absorption-based sensors limited in the past by
the small current-tuning frequency range (typically <2 cm-1) of conventional edge-emitting diode lasers.
Received: 26 July 2000 / Revised version: 2 January 2001 / Published online: 20 April 2001 相似文献
7.
L. Corner J.S. Gibb G. Hancock A. Hutchinson V.L. Kasyutich R. Peverall G.A.D. Ritchie 《Applied physics. B, Lasers and optics》2002,74(4-5):441-444
We have used a violet diode laser at 404 nm and a distributed feedback diode laser at 1320 nm to produce 0.8 nW of radiation
at 309 nm by sum frequency generation in beta-barium borate. The UV radiation was tuned mode-hop-free over 30 GHz and used
to detect OH radicals produced in a microwave discharge. By chopping the UV light at 500 Hz, we observed a concentration of
2×1012 cm-3 with a signal to noise ratio of 30:1.
Received: 16 November 2001 / Revised version: 23 January 2002 / Published online: 14 March 2002 相似文献
8.
Holmelund E. Thestrup B. Schou J. Larsen N.B. Nielsen M.M. Johnson E. Tougaard S. 《Applied Physics A: Materials Science & Processing》2002,74(2):147-152
Indium tin oxide (ITO) films have been deposited by pulsed laser deposition (PLD) at 355 nm. Even though the absorption of
laser light at the wavelength 355 nm is much smaller than that of the standard excimer lasers for PLD at 248 nm and 193 nm,
high-quality films can be produced. At high fluence and at high substrate temperatures, the specific resistivity of the films,
2–3×10-4 Ω cm, is comparable to values obtained with excimer lasers, whereas the resistivities obtained at room temperature are somewhat
higher than those of films produced by excimer lasers. The transmission coefficient of visible light, about 0.9, is also comparable
to values for films deposited by excimer lasers. The crystalline structure of films produced at 355 nm is similar to that
of samples produced by these lasers.
Received: 16 January 2001 / Accepted: 24 July 2001 / Published online: 17 October 2001 相似文献
9.
A compact self-seeded pulsed tunable laser is described. Its optical cavity comprises a diffraction grating, operating at
a grazing angle of incidence as a spectral selector and narrow-band spectral gate. The grating couples two partially overlapping
laser channels: a highly selective master laser and a nonselective slave laser. Due to the implemented efficient intracavity
self-seeding the laser emits spectrally pure single-longitudinal-mode radiation at two independently tunable wavelengths,
with an efficiency and output energy that are typical for nonselective lasers. Results of the experimental investigation of
the laser’s output characteristics are presented.
Received: 12 March 2001 / Revised version: 10 December 2001 / Published online: 7 February 2002 相似文献
10.
Wavelength-modulation spectroscopy using a frequency-doubled current-modulated diode laser 总被引:1,自引:0,他引:1
We have studied atomic absorption in an argon discharge by wavelength-modulation spectroscopy with a frequency-doubled diode
laser. The tunable wavelength-modulated radiation at 430 nm was generated by frequency doubling a current-modulated 860-nm
diode laser in a KNbO3 crystal. 2f-, 4f- and 6f-harmonic spectra as a function of diode laser modulation depth were measured on a Doppler-broadened
sample of excited argon atoms produced in a capacitively coupled plasma chamber. Characterisation of the harmonic signals
was accomplished. Minimum detectable absorbances of 7.7×10-5 and 1.9×10-4 based on a 3σ criterion (σ being the standard deviation of the noise) were estimated for 2f- and 4f-harmonic detection of
the frequency-doubled radiation with a time constant of 0.1 s. The concentrations of argon in the 1s4 state were found to be in the range of 3×108 to 1.2×1011 cm-3 for the experimental conditions studied.
Received: 25 February 2002 / Revised version: 4 April 2002 / Published online: 14 May 2002 相似文献
11.
High frequency stabilization of a 2.2-W injection-locked laser-diode-pumped Nd:YAG laser to a high-finesse optical cavity has been realized by frequency control of the master laser. With the help of an external electro-optical modulator, the feedback bandwidth was extended to 1 MHz and the frequency noise relative to the reference cavity was suppressed to 3 x 10(-4) Hz/Hz(1/2) below 1 kHz. This feedback laser system is an ideal laser source for gravitational wave detectors, which require both ultralow frequency noise and high output power. 相似文献
12.
We stabilized the frequencies of two independent Nd:YAG lasers to two adjacent longitudinal modes of a high-finesse Fabry–Pérot resonator and obtained a beat frequency instability of 6.3 mHz at an integration time of 40 s. Referred to a single laser, this is 1.6×10?17 relative to the laser frequency, and 1.3×10?6 relative to the full width at half maximum of the cavity resonance. The amplitude spectrum of the beat signal had a FWHM of 7.8 mHz. This stable frequency locking is of importance for next-generation optical clock interrogation lasers and fundamental physics tests. 相似文献
13.
Boron isotopic enrichment is observed in the laser ablation of B4C target using nanosecond (ns) wide 532 nm laser beam of a Nd-YAG laser. B10/B11 ratio of 0.9 against the natural abundance of 0.25 is obtained at a laser power density of 8×108 W/cm2 (fluence of 6.4 J/cm2). The enrichment as a function of laser power density is demonstrated using a quadrupole mass spectrometer. Apart from higher
enrichment factor, only singly charged ions are found in the laser plume from the B4C target, in contrast to the multiply charged ions from the BN target reported in a recent report using femtosecond (fs) laser
pulses. This study indicates the possibility of using less expensive, widely used ns lasers, which can also yield a higher
throughput per pulse than a fs laser for isotope enrichment.
Received: 28 September 2001 / Accepted: 4 February 2002 / Published online: 3 June 2002
RID="*"
ID="*"Corresponding author. Fax: +91-4114/480-065, E-mail: mj@igcar.ernet.in 相似文献
14.
M. Yorozu J. Yang Y. Okada T. Yanagida F. Sakai K. Takasago S. Ito A. Endo 《Applied physics. B, Lasers and optics》2002,74(4-5):327-331
A short-pulse X-ray-generation experiment was performed by Compton scattering through interaction between a 3-ps electron
beam and 100-fs laser photons in a 90° scattering configuration. The observed X-ray intensity was typically 3×104 photons/pulse and roughly matched the theoretically expected intensity. The X-ray energy and pulse duration were estimated
theoretically to be 2.3 keV and 280 fs from the observed electron- and laser-beam parameters. The fluctuation of the X-ray
output was measured as 25% (rms) during a 30-min operation. The fluctuation was expressed as a function of the fluctuation
of the timing between the electron and laser beams. The measured fluctuation of the X-rays was approximately consistent with
that caused by the fluctuation of the timing between the beams.
Received: 19 November 2001 / Revised version: 23 January 2002 / Published online: 14 March 2002 相似文献
15.
R.A. Ganeev A.I. Ryasnyansky M.K. Kodirov S.R. Kamalov V.A. Li R.I. Tugushev T. Usmanov 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2002,20(1):129-131
The results of third-order nonlinear susceptibilities studies of Fe- and Zn-doped polyvinylpyrrolidone (PVP) aqueous solution
in processes of third harmonic generation of Nd:YAG laser radiation are presented. Nonlinear susceptibilities of PVP:Fe and
PVP:Zn were calculated to be 5×10-13 esu and 3×10-13 esu respectively. Third harmonic conversion efficiencies in these metallocomplexes were measured to be 8×10-7 and 5×10-7 respectively. The Z-scan method was applied to determine Kerr effect influence on frequency conversion process. The value
of nonlinear refractive index of PVP:Fe at the wavelength of λ = 1064 nm was measured to be n
2 = - 6.7×10-13 esu.
Received 30 November 2001 / Received in final form 27 March 2002 Published online 28 June 2002 相似文献
16.
G. Schreiber H. Suche Y.L. Lee W. Grundkötter V. Quiring R. Ricken W. Sohler 《Applied physics. B, Lasers and optics》2001,73(5-6):501-504
Using an FM-mode-locked Ti:Er:LiNbO3 waveguide laser as the fundamental source, wavelength conversion by cascaded χ(2):χ(2)-difference frequency generation with a conversion efficiency of up to +3(-4.6) dB was demonstrated at a pulse repetition
rate of about 2 (10) GHz. In addition, multi-channel conversion was demonstrated with a fully packaged wavelength converter
using a continuous fundamental source.
Received: 29 May 2001 / Revised version: 10 August 2001 / Published online: 2 November 2001 相似文献
17.
The InAs/GaAs quantum dot laser diodes and corresponding quantum dot samples are irradiated by 1 MeV electron. The laser performance and quantum dot photoluminescence intensity at room temperature are enhanced over a fluence range of 4 × 1013 cm?2. The radiation-induced defects increase the efficiency of carrier transfer to the quantum dots, which results in the improvement of photoluminescence performance under low level displacement damage. The contact resistant of quantum dot lasers decreases because the ohmic contact is also improved by electron irradiation. 相似文献
18.
Development of a tunable mid-IR difference frequency laser source for highly sensitive airborne trace gas detection 总被引:4,自引:0,他引:4
Richter D Fried A Wert BP Walega JG Tittel FK 《Applied physics. B, Lasers and optics》2002,75(2-3):281-288
The development of a compact tunable mid-IR laser system at 3.5 μm for quantitative airborne spectroscopic trace gas absorption
measurements is reported. The mid-IR laser system is based on difference frequency generation (DFG) in periodically poled
LiNbO3 and utilizes optical fiber amplified near-IR diode and fiber lasers as pump sources operating at 1083 nm and 1562 nm, respectively.
This paper describes the optical sensor architecture, performance characteristics of individual pump lasers and DFG, as well
as its application to wavelength modulation spectroscopy employing an astigmatic Herriott multi-pass gas absorption cell.
This compact system permits detection of formaldehyde with a minimal detectable concentration (1σ replicate precision) of
74 parts-per-trillion by volume (pptv) for 1 min of averaging time and was achieved using calibrated gas standards, zero air
background and rapid dual-beam subtraction. This corresponds to a pathlength-normalized replicate fractional absorption sensitivity
of 2.5×10-10 cm-1.
Received: 29 April 2002 / Published online: 21 August 2002
RID="*"
ID="*"Corresponding author. Fax: +1-303/497-1492, E-mail: dr@ucar.edu 相似文献
19.
uv
vac=351.165 nm) of a ps 1 kHz Nd:YLF laser system is frequency tripled in xenon and mercury vapour. About 4×104 photons per pulse, i.e. 4×107 photons/s, are generated in xenon yielding a conversion efficiency of η=3×10-10. The unusual frequency tripling in xenon takes place in a positive dispersive wavelength region. It is shown that Kerr-induced
dispersion in the atomic system and a fifth-order process rather than a third-order process can explain the frequency tripling.
For comparison a four-wave mixing process is investigated in negative dispersive mercury vapour. Due to absorption of the
generated VUV radiation in the autoionization region of mercury the observed effective efficiency is, in our experimental
arrangement, even lower than in xenon. An analysis of the VUV generation with respect to absorption is given.
Received: 1 September 1997 相似文献
20.
Nonlinear optical response of Ge nanocrystals in silica matrix with excitation of femtosecond pulses
H.P. Li C.H. Kam Y.L. Lam Y.X. Jie W. Ji A.T.S. Wee C.H.A. Huan 《Applied physics. B, Lasers and optics》2001,72(5):611-615
We report an investigation of third-order optical nonlinearities in Ge nanocrystals (∼6 nm radius) embedded in silica matrix
using the Z-scan and pump-probe techniques with femtosecond laser pulses at 780-nm wavelength. The nanocrystallite Ge samples
were prepared using magnetron co-sputtering and post-thermal annealing at 800 °C. The nonlinear absorption coefficient and
refractive index of the Ge nanocrystals were determined to be in the range from 1.8×10-7 to 6.8×10-7 cm/W and 1.5×10-12 to 8.0×10-12 cm2/W, respectively, which are proportional to the Ge atomic fraction in the matrix. Relaxation of the nonlinear response was
found to have two characteristic time constants, 1.8 ps and 65 ps. The mechanisms responsible for the observed nonlinear response
are discussed.
Received: 21 August 2000 / Revised version: 17 January 2001 / Published online: 30 March 2001 相似文献